Article
Engineering, Mechanical
Pedro R. da Costa, Luis Reis, Manuel Freitas
Summary: Ultrasonic fatigue testing is a method that uses resonance to achieve very high cyclic load frequencies for studying high cycle fatigue. This study modified the geometry of the specimen and conducted numerical and experimental modal behavior analysis to achieve reliable multiaxial fatigue testing. The results prove a clear trend in crack propagation details with the increase of the induced stress ratio.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Ulrike Karr, Bernd M. Schonbauer, Yusuke Sandaiji, Herwig Mayer
Summary: The study investigated the influence of mean shear stress on internal inclusion-initiated torsion very high cycle fatigue (VHCF). Tests were performed using high-strength spring steel with an increased number of nonmetallic inclusions, predicting the torsion fatigue limit in the presence of detrimental defects. A fine granular area (FGA) was formed at an artificial surface defect in a torsion test, consuming 98% of the VHCF lifetime.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Ulrike Karr, Bernd M. Schoenbauer, Yusuke Sandaiji, Herwig Mayer
Summary: This study investigates inclusion-initiated fracture in high-strength spring steel and finds that inclusion size and hardness have an impact on cyclic strength, with a predictive model proposed. Under torsion loading, defect sensitivity increases significantly with superimposed static mean load.
Article
Engineering, Mechanical
NohJun Myung, Liang Wang, Nak-Sam Choi
Summary: The study shows that shot-peening has a positive effect on high cycle fatigue strength, but a negative impact on very high cycle fatigue strength. Fish-eye fractures mainly occur at locations deeper than the compressive residual stress zone. In the very high cycle fatigue range, the improvement in fatigue strength as a result of shot-peening treatment is almost non-existent.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Z. R. Zhang, Z. M. Yue, Y. M. Bao, C. W. Xu, J. Gao
Summary: Research on the fatigue behaviors of dual-phase steels (DP600) under cyclic shear path has shown that the material exhibits cyclic softening, with smaller loading amplitudes and higher strain ratios improving the softening ability. Additionally, well-developed gamma-fiber-type texture components at higher strain ratios enhance the fluidity of the dual-phase steel, leading to more uniform microstructure deformation and reduced risk of damage caused by deformation compatibility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Albin Gottwalt-Baruth, Paul Kubaschinski, Manuela Waltz, Rainer Voelkl, Uwe Glatzel, Ulrich Tetzlaff
Summary: The cyclic deformation behavior of a non-oriented electrical steel sheet depends on the loading condition, and it can exhibit continuous cyclic hardening, cyclic slip, or cyclic softening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Tao Cong, Guian Qian, Guanzhen Zhang, Si Wu, Xiangnan Pan, Leiming Du, Xiaolong Liu
Summary: Experimental results demonstrated the significant impact of inclusion size and stress ratio on the very-high-cycle fatigue (VHCF) behavior of pearlitic steel. The differences in S-N curves under different loading conditions were also notable, with fine granular areas (FGA) forming in the crack initiation region only under specific conditions.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Aerospace
Meng Wang, Hongen Li, Hu Chen, Xingbo Fang, Enze Zhu, Pujiang Huang, Xiaohui Wei, Hong Nie
Summary: This study investigates the influence of the torsion spring's structure features on its fatigue life, and performs parameter optimization design and experimental validation. This provides theoretical support and technical guidance for the application and structural optimization of ultra-high-strength steel structures.
Article
Chemistry, Multidisciplinary
Dagang Wang, Daozhu Song, Magd Abdel Wahab
Summary: This study investigates the effects of contact load and torsion angle on crack propagation behaviors of inclined crossed steel wires during tension-torsion fretting fatigue in acid solution. The results show that as the contact load and torsion angle increase, the crack propagation depth and rate of steel wire both increase and the fatigue life of steel wire decreases. The evolution of friction coefficient, wear depth profiles, Tafel polarization curves and impedance spectra, and wear scar morphologies were analyzed through various methods to explore the mechanisms of friction and wear as well as electrochemical corrosion damage.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Sheji Luo, Ming Liu, Lihong Han, Yuna Xue
Summary: This paper investigates the fatigue behavior of S135 high-strength drill pipe steel under tension-torsion multiaxial loading. The proposed fatigue model is validated and shows good agreement with experimental testing. The failure mechanism is discussed through fracture analysis.
Article
Nanoscience & Nanotechnology
Jian-Zhi Chen, Bin Zhang, Zhu-Man Song, Guang-Ping Zhang
Summary: The biaxial tension-torsion in-phase fatigue properties of a welded joint and base material of an A588 steel train bogie were compared. The relation between equivalent stress amplitude and cyclic fatigue life was determined. Results show that the welded joint specimen has a higher fatigue life than the base material at higher stress amplitudes, but the two become closer at lower stress amplitudes. A critical stress range of 368 MPa to 396 MPa dominates the fatigue damage behavior of the welded joint. When stress amplitude exceeds the critical stress, fatigue crack initiation tends to occur at the boundary between the base material and heat-affected zone, while cracks originate from the weld metal zone under lower stress amplitudes. Comprehensive analysis of microstructure and residual stress distribution provides insights for optimizing fatigue performance of welded metallic components.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Xiufang Gong, Tianjian Wang, Qingsong Li, Yongjie Liu, Hong Zhang, Wei Zhang, Quanyi Wang, Qingyuan Wang
Summary: The study conducted low cycle fatigue experiments under two strain ratios to investigate the effect of mean strain on cycle response and microstructure-sensitive at room temperature. The results showed significant cyclic softening in both modes, with back stress identified as a critical factor controlling the cycle softening behavior.
MATERIALS & DESIGN
(2021)
Article
Engineering, Mechanical
Zhenjie Teng, Haoran Wu, Zhiyong Huang, Peter Starke
Summary: A study was conducted on high carbon chromium GCr15 steel through very high cycle fretting fatigue tests using an ultrasonic fatigue system, revealing that fretting reduced fatigue strength and the presence of mean stress could exacerbate this situation. Models were proposed based on morphologies observed by scanning electron microscope, defining specific regions on the fracture surface, analyzing the formation of fretting fatigue cracks, and studying how fretting and mean stress affected crack propagation post-crack formation.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Chemistry, Physical
Lu Liu, Yifan Ma, Shisen Liu, Shengnan Wang
Summary: The study on the fatigue behavior of medium-carbon pearlitic wheel-steel reveals that stress ratio, loading condition, and MnS inclusions play crucial roles in determining fatigue limits and crack initiation patterns. Both rotating bending and ultrasonic axial cycling tests show that the origin of fatigue fractures and the location of crack initiation vary depending on stress ratios and loading conditions.
Article
Engineering, Mechanical
Bernd M. Schoenbauer, Sumit Ghosh, Ulrike Karr, Sakari Pallaspuro, Jukka Komi, Tero Frondelius, Herwig Mayer
Summary: This study investigated the influence of load ratio on the high and very high cycle fatigue strength of Ck45M steel processed by thermomechanical rolling integrated direct quenching. The results revealed that failure originated from surface aluminate inclusions and pits under both uniaxial and torsional loading conditions. The prevailing fracture mechanisms in the very high cycle fatigue regime were interior crack initiation under uniaxial loading and surface shear crack initiation under torsional loading. The mean stress sensitivity and fatigue strength were evaluated using fracture mechanics approaches, and equal fatigue limits for uniaxial and torsional loading were determined.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
M. Fitzka, H. Rennhofer, D. Catoor, M. Reiterer, H. Lichtenegger, S. Checchia, M. di Michiel, D. Irrasch, T. A. Gruenewald, H. Mayer
EXPERIMENTAL MECHANICS
(2020)
Article
Engineering, Mechanical
Ulrike Karr, Yusuke Sandaiji, Ryota Tanegashima, Shogo Murakami, Bernd Schoenbauer, Michael Fitzka, Herwig Mayer
INTERNATIONAL JOURNAL OF FATIGUE
(2020)
Article
Engineering, Mechanical
Bernd M. Schoenbauer, Michael Fitzka, Ulrike Karr, Herwig Mayer
Summary: The study found that 17-4PH stainless steel exhibited similar critical stress amplitudes for surface and internal failure under constant amplitude (CA) and variable amplitude (VA) loading in high cycle fatigue conditions. For VA loading, failure occurred at Miner damage sums ranging from 0.1 to 0.9 (surface failure) and 0.2 to 2.2 (internal failure). It is acceptable to omit stress amplitudes less than 60% of the maximum amplitude for VA studies in the very high cycle fatigue regime.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Nanoscience & Nanotechnology
B. M. Schonbauer, K. Yanase, M. Chehrehrazi, M. Endo, H. Mayer
Summary: Torsional fatigue tests on martensitic stainless steel 174PH revealed that smooth specimens tested at a frequency of 19 kHz had significantly longer fatigue lifetimes, while fatigue limits were not affected by testing frequency. Additionally, the presence of detrimental defects negated any frequency effects in the study.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Michael Fitzka, Bernd M. Schoenbauer, Robert K. Rhein, Niloofar Sanaei, Shahab Zekriardehani, Srinivasan Arjun Tekalur, Jason W. Carroll, Herwig Mayer
Summary: This study summarizes the comparability of fatigue properties measured with ultrasonic and conventional equipment, focusing on the performance of different materials at ultrasonic frequencies. Aluminium alloys and high-strength steels are insensitive to cycling frequency, while the strain rate sensitivity of ferrite may lead to prolonged lifetimes.
Article
Engineering, Mechanical
Ulrike Karr, Bernd M. Schonbauer, Yusuke Sandaiji, Herwig Mayer
Summary: The study investigated the influence of mean shear stress on internal inclusion-initiated torsion very high cycle fatigue (VHCF). Tests were performed using high-strength spring steel with an increased number of nonmetallic inclusions, predicting the torsion fatigue limit in the presence of detrimental defects. A fine granular area (FGA) was formed at an artificial surface defect in a torsion test, consuming 98% of the VHCF lifetime.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Engineering, Mechanical
Bernd M. Schonbauer, Sumit Ghosh, Jukka Komi, Tero Frondelius, Herwig Mayer
Summary: The research revealed that the high and very high cycle fatigue properties of ultrahigh-strength Ck45M steel are influenced by the size of nonmetallic inclusions, and the area-parameter model performs well in predicting the fatigue limit, with smaller surface defects potentially leading to very high cycle fatigue failure.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Acoustics
Michael Fitzka, Ulrike Karr, Maximilian Granzner, Tomas Melichar, Martin Rodhammer, Alfred Strauss, Herwig Mayer
Summary: In this study, the cyclic compression fatigue properties of concrete were investigated using the ultrasonic fatigue testing method, showing the applicability of ultrasonic testing for rapid generation of VHCF data. Methods such as observing resonance frequency, analyzing higher order harmonics of vibration, and computed tomography of specimens were successful for analyzing fatigue damage. Calorimetric evaluations were used to calculate cyclic irreversible strain in the ultrasonic VHCF test, being approximately 1% of the elastic strain.
Article
Materials Science, Multidisciplinary
B. M. Schoenbauer, M. Killinger, U. Karr, M. Fitzka, U. Mueller, A. Teischinger, H. Mayer
Summary: This study investigates the fatigue properties of sycamore maple under cyclic tension, cyclic compression, and tension-compression loading. The study also presents the fatigue test results of wood generated with the ultrasonic fatigue testing technique. The results show that the cyclic properties are consistent with the static properties, and there is no pronounced frequency effect on fatigue lifetime. The study also finds no evidence of a fatigue limit for sycamore maple.
MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK
(2022)
Article
Engineering, Mechanical
Bernd M. Schoenbauer, Sumit Ghosh, Ulrike Karr, Sakari Pallaspuro, Jukka Komi, Tero Frondelius, Herwig Mayer
Summary: This study investigated the influence of load ratio on the high and very high cycle fatigue strength of Ck45M steel processed by thermomechanical rolling integrated direct quenching. The results revealed that failure originated from surface aluminate inclusions and pits under both uniaxial and torsional loading conditions. The prevailing fracture mechanisms in the very high cycle fatigue regime were interior crack initiation under uniaxial loading and surface shear crack initiation under torsional loading. The mean stress sensitivity and fatigue strength were evaluated using fracture mechanics approaches, and equal fatigue limits for uniaxial and torsional loading were determined.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Ulrike Karr, Bernd M. Schoenbauer, Yusuke Sandaiji, Herwig Mayer
Summary: This study investigates inclusion-initiated fracture in high-strength spring steel and finds that inclusion size and hardness have an impact on cyclic strength, with a predictive model proposed. Under torsion loading, defect sensitivity increases significantly with superimposed static mean load.
Article
Agronomy
Orracha Sae-Tun, Katharina M. Keiblinger, Christoph Rosinger, Axel Mentler, Herwig Mayer, Gernot Bodner
Summary: The study aims to assess the structure-related dissolved organic matter (DOM) patterns in conservation farming systems and investigate the underlying bio-chemical drivers. A novel method combining ultrasonication aggregate breakdown and continuous UV-Vis measurement was used to characterize DOM release from soil. The results showed significant differences in DOM release dynamics between land-use and agricultural management systems.
Article
Engineering, Mechanical
Bernd M. Schoenbauer, Suraj S. More, Guillermo E. Morales-Espejel, Herwig Mayer
Summary: The influence of temperature on the very high cycle fatigue properties of three high carbon chromium bearing steels (52100, 52100-VIM/VAR and M50-VIM/VAR) was investigated. Interior defect-initiated cracking was the dominant failure mechanism at all temperatures. Nonmetallic inclusions were the origin of fracture for 52100 while carbides were the origin for 52100-VIM/VAR and M50-VIM/VAR. The fatigue strength at 300°C decreased significantly compared to 22°C, with 52100 steels experiencing a decrease of 56-57% and M50 a decrease of 41%.
INTERNATIONAL JOURNAL OF FATIGUE
(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)
