Article
Computer Science, Interdisciplinary Applications
Ali O. Ayhan, Oguzhan Demir
Summary: The study conducted experiments and numerical simulations on mixed mode I/II/III fatigue crack growth, evaluating a new 3-D fracture criterion for its applicability in 3-D mixed mode fatigue problems. The developed criterion showed better predictability for crack growth surface under highly mixed mode conditions, reducing deviation from experimental surface compared to other criteria.
COMPUTERS & STRUCTURES
(2021)
Article
Mechanics
Qikun Xie, Hongyu Qi, Shaolin Li, Xiaoguang Yang, Duoqi Shi
Summary: One of the most common damage modes of aero-engine hot-end components is crack, which is typically in a mixed-mode and under elastoplastic conditions due to the complicated geometry and harsh working environment. The phase-field fracture method has recently attracted extensive attention as a numerical simulation method. However, attention toward material damage and crack initiation before the crack emerges is lacking in solving the problem of elasto-plastic mixed-mode fatigue crack propagation. In this study, an enhanced phase-field fracture method is used to address this issue and predict the propagation behavior of the elastoplastic mixed-mode fatigue crack. The effect of some parameters of this model is analyzed. This achievement is a significant contribution to the safety of aircraft engines and a novel method that can be further improved to solve problems in the future.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Qikun Xie, Hongyu Qi, Shaolin Li, Xiaoguang Yang, Duoqi Shi
Summary: This study investigates the fatigue cracking of aeroengine hot-end components, particularly the mixed-mode cracking at high temperature. Experimental tests and adaptive finite element method are used to verify the accuracy of different models. The findings show that the angle dependent models have better accuracy at 550℃, and the crack propagation rate exhibits a different pattern compared to that at room temperature.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
V. Shlyannikov, D. Fedotova, R. Khamidullin
Summary: The effects of two singularity fields, the HRR solution and modified form of the NKH solution, on fatigue crack propagation were investigated. The study found that the crack growth rate in mixed mode was influenced by the coupling effect of mode mixity and cyclic plastic properties.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Jichen Zhong, Jiao Wang, Xiangyu Li, Xihua Chu
Summary: The effects of crack configuration on crack initiation angle were investigated through experiments and numerical simulations, yielding a prediction formula for the crack initiation angle.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Mechanics
Sina Ilyaei, Yousef Abubasir, Reza Sourki
Summary: This study investigated the effects of mixed-mode loading conditions on 3D printed porous scaffolds, revealing that design parameters and pore characteristics significantly impact mechanical strength.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
J. S. Jesus, L. P. Borrego, J. A. M. Ferreira, R. Branco, J. D. Costa, C. Capela
Summary: Mode I and mode I + II fatigue crack growth experiments were conducted using compaction tension shear specimens made of Ti-6Al-4V by additive manufacturing at various loading angles. The performance of different methodologies used to determine the equivalent stress intensity factor was studied. It was found that simpler methods achieved good results when considering the crack deflection angle in the algorithm. The crack growth speed was not significantly affected by the similar values of crack deflection angle, predominance of mode I loading, and similar crack closure effect.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Lin-qi Xie, Chang-yu Zhou, Peng Zhang, Xiao-hua He
Summary: This study investigated the mixed mode I-II fatigue crack growth behavior of commercial pure titanium (CP-Ti) under tensile overload at negative load ratios using experiments and finite element method (FEM). The effects of loading angle, load ratio, and overload on crack growth were discussed, and the mechanism of crack growth under overload was revealed. The experimentally compared fatigue crack growth path and rate with/without overload, and investigated the overload retardation effect. The variation of plastic zone and the distribution of stress and strain were simulated through FEM. The microscopic perspective, crack closure, residual compressive stress at crack tip, mode II shear component, and compressive load effect on overload retardation effect were demonstrated.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Sepehr Ghafari, Fereidoon Moghadas Nejad
Summary: R-curves provide a means for detailed analysis of crack propagation in engineering materials. In this study, SE(B) tests were conducted on AC mixtures in pure mode I and mixed mode (I/II) states at various temperatures. The research found that increasing shear mode contribution led to a larger stable crack growth region, while unstable crack propagation was more prominent at lower temperatures. Additionally, increasing the NMAS value from 19 mm to 25 mm was observed to enhance cohesive energy and blunting work required for crack initiation, amplifying unstable crack growth at -20°C and -15°C.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Chemical
Mohammed El Yaagoubi, Jens Meier
Summary: This article investigates the prediction of crack growth angles of internal cracks in EPDM rubber under mixed mode loading. The determination of the strain energy density factor successfully predicted the crack growth angles, which showed very good accordance with the experimental measurements.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Engineering, Mechanical
Monika Duda, Dariusz Rozumek, Michal Smolnicki, Anna Wybraniec
Summary: The article discusses the results of a study on fatigue fracture in mixed and I + II and I + III modes in heat treated steel 42CrMo4. It presents different mechanical properties resulting from various thermal treatments and demonstrates tests conducted on different sample types and load angles. The research aims to enhance understanding of fatigue crack development under mixed modes and provide valuable insights into the material's behavior under complex loads.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Daniele Amato, Lukas Mayrhofer, Christian Robl, Guido Dhondt, Roberto Citarella
Summary: This study proposes two algorithms based on the dominant step criterion to evaluate the crack growth propagation direction under non-proportional mixed-mode loading conditions. They are implemented in two commercial software tools and validated with experimental data. The results show that both software predictions are in good agreement with the experimental results, confirming their validity as tools for simulating crack propagation under mission conditions.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Multidisciplinary
Abdulnaser M. Alshoaibi
Summary: This paper aims to simulate the propagation of linear elastic cracks in 3D structures using Ansys software's SMART technology, accurately predicting crack growth paths and stress intensity factors. The study indicates that cracks are attracted to holes and change trajectory to reach or grow by the hole. Experimental crack path trajectories and stress intensity factors had very good agreement with computational study results.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Civil
M. A. Hussien, M. Moawad, M. H. Seleem, H. E. M. Sallam, H. M. El-Emam
Summary: In this study, the fracture toughness of fiber-reinforced concrete was experimentally determined using matrix cracked specimens. A comparison was made with traditional through-thickness cracked specimens. The results showed that the matrix cracked specimens provided a more realistic estimation of fracture toughness and the effect of fiber length on toughness was marginal.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Mechanics
Iman Shakeri, Amir Reza Shahani, Calvin David Rans
Summary: This study focused on the fatigue crack growth behavior of welded joints under various loading scenarios, finding that the crack growth retardation behavior is sensitive to post-welding heat treatments. A modification to the Wheeler model was proposed to improve the accuracy of retardation prediction after applying a mixed mode overload.
ENGINEERING FRACTURE MECHANICS
(2021)
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)