Article
Materials Science, Multidisciplinary
Xiangnan Pan, Leiming Du, Guian Qian, Youshi Hong
Summary: This study investigates the behavior of very-high-cycle fatigue (VHCF) in metallic materials such as aluminum alloys and high-strength steels. The research reveals that in additively manufactured AlSi10Mg alloy, crack initiation and growth mechanisms are distinct from those in high-strength steels, but demonstrate a similar characteristic region of crack initiation known as fine granular area (FGA).
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Article
Nanoscience & Nanotechnology
Xiaolu Gui, Guhui Gao, Baifeng An, R. D. K. Misra, Bingzhe Bai
Summary: The study investigated the effects of inclusion size and microstructural features on HCF/VHCF in a B/M steel. It was found that fatigue crack initiation was mainly influenced by inclusions, with the majority of fatigue life consumed by the crack initiation process regardless of the source of the crack. The ratio of fatigue crack initiation life to total fatigue life exhibited a wide scatter due to variations in the B/M hierarchical structure within individual prior austenite grains when cracks initiated from sub-surface microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Alice Cervellon, Chris J. Torbet, Tresa M. Pollock
Summary: The anisotropic fatigue properties of three Ni-based SX superalloys were investigated in the very high cycle fatigue regime. The [111] orientation showed higher fatigue lives at high stresses but lower fatigue lives at very low stresses. The resolved shear stress on the octahedral slip systems and the pseudo-cube slip in the matrix were identified as the main reasons for the anisotropy effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Z. M. Jian, G. A. Qian, D. S. Paolino, A. Tridello, F. Berto, Y. S. Hong
Summary: The study revealed that AlSi10Mg specimens printed with 50μm powder size exhibit higher fatigue properties compared to those printed with 20μm powder size, with unmelted powders being the main source of crack initiation. Additionally, specimens printed with 50μm powder size are more prone to subsurface crack initiation in the VHCF regime, with five different crack initiation modes identified and fatigue strength assessed by statistical model.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Kun Yang, Qi Huang, Bin Zhong, Yong Jie Liu, Chao He, Hanqing Liu, Ning Su, Qingyuan Wang, Qiang Chen
Summary: The research showed that increasing the colony content in bimodal titanium alloys can enhance the high cycle fatigue and very high cycle fatigue properties. However, crack initiation life is less sensitive to changes in microstructure compared to fatigue crack growth life. As fatigue life increases, the impact of microstructure evolution on fatigue resistance gradually decreases.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Review
Engineering, Mechanical
A. Tridello, C. Boursier Niutta, F. Berto, D. S. Paolino
Summary: This paper critically reviews the size-effect in very high cycle fatigue (VHCF), analyzing experimental results obtained by testing specimens with different sizes and discussing methodologies proposed to model the size-effect, with the aim of guiding future research on the size-effect in VHCF.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Zhi Qin, Bin Li, Chen Chen, Tianyue Chen, Rui Chen, Han Zhang, Hongqian Xue, Changfeng Yao, Liang Tan
Summary: The study investigated the high cycle and very high cycle fatigue behavior of the GH4169 superalloy. The results showed that failures in different fatigue regimes had different initiations, and significant strain localization occurred at the twin boundaries of the material under fatigue cyclic loading.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Garrett A. Webster, Alireza Behvar, Shawkat I. Shakil, Riyanka Ribble, Kathleen Chou, Ajay Krishnamurthy, Shahab Zekriardehani, Joseph Lawrence, Sajad Shakerin, Mohsen Mohammadi, Andrea Tridello, Davide S. Paolino, Meysam Haghshenas
Summary: This paper presents a comprehensive study on the VHCF characterization of WAAM ER100S-G steel, revealing its extended fatigue life behavior and failure mechanisms. The findings provide valuable insights into optimizing design guidelines for additive manufacturing in high-cycle and very high-cycle fatigue domains.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Mechanical
Tao Gao, Hongqian Xue, Zhidan Sun, Delphine Retraint, Yanli He
Summary: The fatigue behavior and damage mechanisms of a Ti-8Al-1Mo-1V alloy were investigated in the very high cycle fatigue (VHCF) regime. It was found that the crack initiation area is characterized by nano-marking facets and flat facets induced by slip activity. The large scatter in fatigue life can be attributed to slip inhomogeneity.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Jingyu Sun, Guian Qian, Jianghua Li, Ruiyang Li, Zhimo Jian, Youshi Hong, Filippo Berto
Summary: Currently, there is no systematic approach to simulate the microstructure sensitive crack initiation and propagation process in very-high-cycle fatigue. In this study, a computational framework combining crystal plasticity and cohesive zone model is developed to simulate the defect-induced short crack growth in an additively manufactured AlSi10Mg alloy. The framework can control the crack growth rate and the proportion of crack initiation damage in the total damage. An acceleration strategy is proposed to improve the computational efficiency for very-high-cycle fatigue. Experimental observations and simulation results show good agreement.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
Xue Li, Yajun Dai, Xiangyu Wang, Yongjie Liu, Yao Chen, Chong Wang, Hong Zhang, Lang Li, Hanqing Liu, Chao He, Qingyuan Wang
Summary: This study investigates the effect of local microstructure on the crack initiation behavior of a super martensitic stainless steel in the very high cycle fatigue regime. Results show that non-inclusion-induced crack initiation dominates, with fatigue cracks initiating from martensite boundaries forming slip areas. The size and orientation of martensite lath affect the morphology of slip areas but have limited influence on the formation of fine granular areas at the fracture surface.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Weiqian Chi, Gen Li, Wenjing Wang, Chengqi Sun
Summary: This study investigates the very high cycle fatigue behavior of additively manufactured Ti-6Al-4V material under different stress ratios. The fracture surface analysis reveals the presence of a fine granular area (FGA) with discontinuous regions of nanograins in the crack initiation and early growth region. The crack growth rate in the FGA can be used to predict the fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Crystallography
Baohua Nie, Shuai Liu, Yue Wu, Yu Song, Haiying Qi, Binqing Shi, Zihua Zhao, Dongchu Chen
Summary: The effect of low cycle fatigue (LCF) predamage with no precracks on very high cycle fatigue (VHCF) properties and crack initiation characteristics for TC21 titanium alloy was investigated. It was found that LCF predamage with less than 5% of fatigue life had minimal impact on fatigue limit but reduced fatigue life. Fatigue cracks initiated on the surface of the specimen at high stress amplitudes, while fatigue cracks initiated below the surface at low stress amplitudes. A combined fatigue damage model was established based on Lemaitre damage theory, and it showed consistency with experimental data. The fatigue crack initiation of specimens with LCF predamage less than 5% accounted for a significant portion of fatigue life.
Article
Engineering, Mechanical
Tsuyoshi Miyakoshi, Takeru Atsumi, Kensuke Kosugi, Atsushi Hosoi, Terumasa Tsuda, Hiroyuki Kawada
Summary: This paper investigates the transverse crack initiation behaviors of carbon fiber-reinforced plastics (CFRPs) in the high-cycle and very high cycle regimes. The fatigue behavior of cross-ply CFRP laminates formed with T800S/2592 prepreg was studied by using an ultrasonic fatigue testing system. The results show that the slope of the S-N diagram for transverse crack initiation decreases linearly within a certain number of cycles and levels off after a certain number of cycles, and no cracks were observed under a certain stress.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Mechanical
Fulin Liu, Haotian Peng, Yongjie Liu, Chong Wang, Qingyuan Wang, Yao Chen
Summary: The fatigue behavior of titanium alloy with different stress ratios was studied at 400 degrees C in the VHCF regime. The initiation of cracks depends on the formation of facets, which is related to the maximum shear stress. The formation of facets is induced by basal or prismatic slips with a high Schmid factor inside alpha(p) grains. The morphology of alpha(p) grains affects the initiation of cracks. High-density geometrically necessary dislocations (GNDs) accumulate along with the slips and form subgrain boundaries (sub-GBs) within alpha(p) grains. With cyclic loading, the created sub-GBs further form facets, initiating microcracks.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Stefan Gabel, Sven Giese, Ralf Uwe Webler, Steffen Neumeier, Mathias Goeken
Summary: MCrAlY bond coats are commonly used as oxidation-resistant coatings on superalloys. The major phase is the thermally stable intermetallic beta-NiAl phase. The addition of Cr increases the oxidation resistance but leads to the formation of brittle alpha-Cr precipitates, which decrease the fracture toughness of the bond coat.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Zhida Liang, Jonathan D. H. Paul, Andreas Stark, Andreas Bezold, Steffen Neumeier, Mathias Goeken, Florian Pyczak
Summary: Recent research has explored the Co-Al-W system and revealed interesting properties, but its high tungsten content limits industrial applications. As a result, new high temperature superalloys based on the Co-Ni-Al-Ti system, strengthened by chromium and different refractory elements, have been developed. These alloys exhibit better mechanical properties at high temperatures compared to conventional Ni-based superalloys and Co-based superalloys.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Editorial Material
Materials Science, Multidisciplinary
Ramamoorthy Ramesh, Susmita Bose, Mathias Goeken, Sarah Morgan
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
A. Bezold, L. P. Freund, A. Foerner, J. Voelkl, L-K Huber, M. Goeken, S. Neumeier
Summary: Recent researches have shown the excellent high-temperature properties of polycrystalline CoNi-base superalloys, but their deformation behavior has been rarely studied. This study investigated the deformation mechanisms of four polycrystalline CoNi-base superalloys with slightly different compositions. The results showed that the deformation mechanism changed with strain-rate and temperature, and the alloys with (Ta + Ti) exhibited a transition from shearing by APB-coupled dislocation pairs to stacking fault shearing and microtwinning. In contrast, APB-based shearing mechanisms were observed in both (Al + W)-rich alloys under all conditions.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
A. Kirchmayer, M. Weiser, P. Randelzhofer, L. P. Freund, B. Gehrmann, M. Hafez Haghighat, D. Huenert, M. Goeken, S. Neumeier
Summary: VDM (R) Alloy 780 is a new polycrystalline Ni-based superalloy with high Co, Cr, and Al contents designed for operation up to 750 degrees C. The alloy is strengthened by the precipitation of the gamma ' phase, which has been analyzed using atom probe tomography. Delta and eta phases are also present for grain boundary pinning, with the former forming plate-like or lamellar structures inside the latter. Compared to Udimet 720Li and A718Plus, VDM (R) Alloy 780 exhibits superior oxidation resistance at 800 degrees C and 900 degrees C, showing lower mass gain and thinner oxide layers. Transmission electron microscopy and scanning transmission electron microscopy investigations of the oxide scales reveal that the Al/Ti ratio plays a significant role in the oxidation behavior of these alloys.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Benjamin Wahlmann, Jakob Bandorf, Nicklas Volz, Andreas Foerner, Johannes Proebstle, Kerstin Multerer, Mathias Goeken, Matthias Markl, Steffen Neumeier, Carolin Koerner
Summary: Numerical methods can accelerate the design of alloys with improved material properties, such as CoNi-base alloys optimized for high strength or high chemical homogeneity. The design approach using CALPHAD-based models has shown promising results in developing new alloys, although its applicability to CoNi-base alloys has not been studied extensively. By implementing Scheil calculations in the optimization routine, the severity of segregation in the alloys can be quantified, allowing the prediction of non-equilibrium phases and achieving a high degree of homogeneity. The comparison with CALPHAD calculations confirms the accuracy of trends in elemental partitioning behavior and phase transition temperatures.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
A. Bezold, L. Amon, N. Karpstein, E. Spiecker, M. Goken, S. Neumeier
Summary: Stacking fault shearing is commonly observed in Co-base and CoNi-base superalloys in the intermediate temperature regime, and the recovery processes after aging and creep experiments are significant. Superlattice stacking faults recover more quickly than intrinsic ones above 950℃. Moreover, the significance of stacking fault shearing in the high temperature creep regime could be higher than traditionally indicated due to recovery processes.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Jan Henning Risse, Matthias Trempa, Florian Huber, Heinz Werner Hoeppel, Dominic Bartels, Michael Schmidt, Christian Reimann, Jochen Friedrich
Summary: Hypereutectic Al-high Si alloys have gained significant interest for their applications in various industries due to their low weight, low thermal expansion, and excellent mechanical and tribological properties. This study investigated the production of Al-high Si alloys with extremely high silicon content using laser powder bed fusion technology, and successfully produced crack-free samples with high density and improved hardness and compressive strength. It was also found that using powder blends provided similar alloy properties as pre-alloyed powders, enabling more flexibility in alloy development.
Article
Materials Science, Multidisciplinary
Andreas Foerner, Jan Vollhueter, Anna Krapf, Abdullah Jamjoom, Daniel Hausmann, Benjamin Wahlmann, Zongwen Fu, Carolin Koerner, Steffen Neumeier, Mathias Goeken
Summary: By increasing the density of interfaces in NiAl-CrMo in situ composites through electron beam powder bed fusion (PBF-EB), a refined microstructure with an equiaxed or columnar cell morphology can be achieved. The mechanical properties at elevated temperatures are significantly improved compared to conventionally cast material, with the columnar morphology exhibiting the best performance at high temperatures and the equiaxial morphology showing nearly ideal isotropic mechanical behavior.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
M. Koebrich, A. Foerner, N. Volz, C. H. Zenk, S. G. Fries, M. Goeken, S. Neumeier
Summary: The influence of various alloying elements on Co-Al-W based superalloys has been investigated, but the role of refractory and platinum group elements is still not fully understood. This study examines the microstructural changes and phase stability in Co9Al9W-X superalloys with different elements. Results show that adding refractory and platinum group elements preserves the gamma/gamma' microstructures but leads to the formation of additional intermetallic phases. The findings are compared with thermodynamic calculations and analyzed using different techniques. (c) 2023 Published by Elsevier B.V.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
A. Kirchmayer, M. Proebstle, D. Huenert, S. Neumeier, M. Goeken
Summary: Recently, the impact of orientation of eta/delta plates in Ni-base superalloys ATI 718Plus on fatigue crack propagation behavior was investigated. As the targeted alignment of eta/delta precipitates in complex components can be challenging, the effects of other microstructural features of ATI 718Plus were tested. It was found that increasing the eta/delta volume fraction, gamma' volume fraction, and precipitate size improved crack growth resistance but worsened creep properties. Conversely, increasing grain size enhanced creep properties and fatigue crack growth resistance. Compared to microstructures with strongly aligned eta/delta plates, the impact of the investigated microstructures on mechanical properties was smaller. These findings provide insights for designing desired microstructures based on specific application requirements for crack propagation and creep resistance.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
J. Vollhueter, A. Bezold, N. Karpstein, M. Koebrich, E. Spiecker, M. Goeken, S. Neumeier
Summary: The deformation mechanisms in superalloys depend on parameters such as composition, temperature, and strain rate. This study investigated the change in deformation mechanism from shearing by APB-coupled dislocations to shearing under the formation of stacking faults as a function of strain rate. The results showed that the deformation mechanism transition is influenced by strain rate, with higher stacking fault density associated with lower strain rates and higher yield strength.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Philip Manuel Pohl, Moritz Kuglstatter, Mathias Goeken, Heinz Werner Hoeppel
Summary: Heterostructured materials, such as metallic laminates (LMCs), can exhibit enhanced mechanical behavior through the hetero-deformation-induced (HDI) strengthening effect. This study introduces a novel approach to quantify the co-deformation effects in metallic laminates by analyzing the behavior of inelastic back strain upon unloading. Experimental tests reveal additional amounts of inelastic back strain for different metallic laminate systems compared to a linear rule of mixture approximation. Finite element analysis provides insights into the distribution of residual plastic strain in the metallic laminates, supporting the derived schematic overview of the spatial distribution of the hetero-deformation zone. The method presented in this study enables valuable insights into the cyclic deformation behavior of metallic laminates for future applications.
Article
Engineering, Manufacturing
Christina Fuchs, Daniel Elitzer, Heinz Werner Hoeppel, Mathias Goeken, Michael F. Zaeh
Summary: The influence of interlayer temperature on the machinability and microstructure of wire and arc additively manufactured Ti-6Al-4V was studied. Contrary to expectations, the machinability, mechanical properties, and macro- and microstructures were only slightly affected by the interlayer temperature.
PRODUCTION ENGINEERING-RESEARCH AND DEVELOPMENT
(2023)
Article
Engineering, Mechanical
Miloslav Kepka, Miloslav Kepka Jr, Radovan Minich
Summary: This paper focuses on the fatigue life evaluation of the bodywork of a new articulated electric (battery) bus. The findings resulted in recommendations to improve the operational reliability of a particular vehicle and provided challenges for future research.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
T. Dusautoir, B. Berthel, S. Fouvry, P. Matzen, K-D. Meck
Summary: This study investigates the impact of post-processing treatments on the fatigue limit of additive manufactured Ti-6Al-4V under stress gradients, with a focus on surface integrity.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Zhuofan Xia, Di Wu, Xiaochen Zhang, Jianqiu Wang, En -Hou Han
Summary: The study reveals the surface-initiated rolling contact fatigue (RCF) failure mechanism under heavy load and initial high roughness surface. The results indicate that precursor of collapsed morphology and nanocrystalline layer are the main factors causing lower RCF life with high roughness compared to low roughness surfaces. The spalling failure initiating from low roughness surface under heavy load is strongly dependent on surface plastic deformation.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Daniel Gren, Knut Andreas Meyer
Summary: Rolling contact loading can cause plastic deformation and fatigue cracks. Current rail standards do not consider the effect of plasticity on mechanical behavior. This study proposes a new method for evaluating the fatigue life of deformed material and finds that superimposed compressive axial loads can increase fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
R. Kumar, S. Sanyal, J. Bhagyaraj, E. Hari Krishna, S. Mukherjee, K. Prasad, S. Mandal
Summary: This study investigates the thermomechanical fatigue (TMF) behavior of Timetal 834 alloy under different loading conditions. The results show that the alloy exhibits different cyclic hardening and softening responses at different strain amplitudes. The strain amplitude and phase angle have significant effects on the TMF life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Kai Donnerbauer, Tobias Bill, Peter Starke, Ruth Acosta, Bharath Yerrapa, Christian Boller, Klaus Heckmann, Frank Walther
Summary: Given the aging of nuclear power plants, it is important to develop methods for evaluating the integrity of components and structures in nuclear engineering. Suitable nondestructive testing methods can detect material degradation and determine its fatigue life. This study utilized various NDT parameters and scanning electron microscopic methods to explore the relationship between microstructure evolution and NDT data.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Liuyong He, Jiang Zheng, Tianjiao Li, Houkun Zhou, Lihong Xia, Bin Jiang
Summary: This study quantitatively analyzed the effects of precipitates on the deformation mode, cracking mode, and mechanical behavior of WE54 magnesium alloy during low-cycle fatigue. It was found that precipitates promoted the activation of dislocation slip and suppressed the activation of twinning, affecting the cracking mode and mechanical behavior.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Xiangkang Zeng, Conghui Zhang, Wenguang Zhu, Mingliang Zhu, Tongguang Zhai, Xiaomei He, Kangkai Song, Zhuohang Xie
Summary: The cyclic deformation behaviors and damage mechanisms of pure Zr were investigated. The cyclic stress response was mainly influenced by substructure evolutions. Prismatic < a > dislocation slip was identified as the dominant deformation mechanism. Fatigue damage was not only influenced by the initial texture, but also other factors.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Jingyu Yang, Bingbing Li, Yiming Zheng, Gang Chen, Xu Chen
Summary: Heat treatment is used to improve the low-cycle fatigue performance of additive manufactured 316LN stainless steel. The heat-treated material demonstrates initially cyclic hardening followed by softening behavior, and shows a stronger resistance to crack propagation compared to the as-built material, resulting in a longer fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Lang Zou, Dongfang Zeng, Xiong Chen, Jun Li, Hai Zhao, Liantao Lu
Summary: This study investigates the competitive relationship between fretting fatigue and plain fatigue in press-fitted railway axles. By changing the depth of the stress relief groove, the plain fatigue limit and fretting fatigue strength were tested. Detailed information was gathered, and an evaluation methodology integrating finite element simulation and the Modified Wohler Curve Method was established. The study concludes that the optimal groove depth, which balances the anti-fatigue capabilities, depends on the number of test cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Davide Leonetti, Koji Kinoshita, Yukina Takai, Alain Nussbaumer
Summary: This paper investigates the fatigue behavior of non-load-carrying transverse welded steel attachments, including fatigue crack monitoring and fracture surface analysis under constant and variable amplitude loading. A procedure is proposed to obtain a Markov transition matrix based on the measured strain signal and to randomly resample the stress history for variable amplitude fatigue tests.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Zhe Zhang, Bing Yang, Yuedong Wang, Shoune Xiao
Summary: This paper presents a method for designing fatigue life prediction models with small sample sizes by handling limited sample data. The method integrates the equivalent structural stress method with the maximum likelihood estimation method and adds reliability verification, resulting in enhanced goodness of fit, stability, and optimized sample quantity.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Cooper K. Hansen, Gary F. Whelan, Jacob D. Hochhalter
Summary: This paper presents a method to address the computational demand issue of computing FIPs using CPFEM by developing an interpretable machine learning model. Genetic programming is used to evolve interpretable expressions of FIPs from microstructure features, and these models can serve as efficient substitutes for CPFEM and be easily integrated into engineering workflows.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Luca Susmel
Summary: This paper discusses the problem of estimating notch fatigue limits using machine learning. The results show that machine learning is a promising approach for designing notched components against fatigue. The accuracy in estimating the fatigue limit can be increased by increasing the size and quality of the calibration dataset, as well as including additional input features.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Kefeng Gao, Guoqi Tan, Yanyan Liu, Qiang Wang, Qian Tang, Xuegang Wang, Qiqiang Duan, Zengqian Liu, Zhe Yi, Zhefeng Zhang
Summary: Bioinspired architectures have significant effects on material enhancement. This study investigates the fatigue properties of bioinspired ceramic-polymer composites and natural nacre, revealing the close relationship between architectural types, orientations, fatigue performance, and damage mechanisms.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)