Article
Mechanics
Wei Zhang, Qiaofa Yang, Peng Yin, Guodong Zhang, Xianxi Xia, Yanfen Zhao, Liyu Wang, Guosong Jiang, Changyu Zhou
Summary: This study investigates the relationship between temperature variation and thermomechanical fatigue (TMF) fracture behaviors. The results show that temperature changes lead to accelerated cyclic softening, reduced fatigue life, and dynamic strain aging (DSA), which are influenced by the temperature range and average temperature.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Jian Song, Yongkang Zhang, Xiaojun Guo
Summary: This study experimentally elaborated the in-of-phase thermomechanical fatigue (TMF) behaviors and failure mechanism of high-temperature resistant 2.5D woven composites for the first time. The results showed that the TMF behaviors of the composites exhibited low cycle fatigue characterization and the fiber pull-out length and extensive debonding were more severe than those failed in static loading.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Ahmed Azeez, Viktor Norman, Robert Eriksson, Daniel Leidermark, Johan Moverare
Summary: Understanding crack growth behavior is crucial for accurate prediction of fatigue lives. Testing out-of-phase thermomechanical fatigue crack propagation on FB2 steel in high-temperature steam turbine sections showed the impact of crack closure on growth rate. The study also found that crack growth rate is mainly controlled by the minimum temperature of the cycle, and finite element models with stationary sharp cracks can capture crack closure behavior.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Electrical & Electronic
Mohammad-Reza Tofighi, Anilchandra Attaluri
Summary: This article introduces a system combining microwave heating and infrared temperature sensor with closed-loop feedback control using pulse-width modulation for noninvasive measurement of blood flow/perfusion. A novel phantom is also introduced to create quantifiable perfusion, and the experimental results demonstrate the system's effectiveness in evaluating different perfusion levels.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Engineering, Electrical & Electronic
Yiming Zhang, Erping Deng, Zhibin Zhao, Jie Chen, Yushan Zhao, Jiaqi Guo, Xiang Cui
Summary: In this article, a sequential V-ce(T) method with separated gate controller is proposed to measure the junction temperature distribution within press-pack insulated gate bipolar transistors (PP IGBTs). The method is integrated into a standard dc power cycling test to validate its applicability and effectiveness. The measured junction temperature exhibits a specific distribution pattern influenced primarily by the deformation of the copper plate.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Mechanical
Marcos Lopes Leal Junior, Laurent Pino, Mahmoud Barati, Luc Saint-Sulpice, Laurent Daniel, Shabnam Arbab Chirani
Summary: A new constitutive modeling is proposed to simulate the cyclic thermomechanical behavior of SMA-based actuators activated by Joule heating. The model considers the impact of different phenomena highlighted during experimental tests and is validated by comparing simulation results with experimental tests.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Materials Science, Composites
Yanru Zhao, Jian Song, Wanshuang Li
Summary: This study elaborates the weft direction in-phase thermomechanical fatigue (IP TMF) behaviors of T300/PI-380 2.5D-WCs for the temperature variation between 100 and 300 degrees C for the first time. Results show that the IP TMF responses of 2.5D-WCs exhibit low cycle fatigue characteristics with decreasing trend in line with the increase of cycle number. The residual stiffness and residual strength behaviors are investigated and numerical models are proposed based on damage mechanics. Fracture morphologies of 2.5D-WCs under IP TMF loading have been explored. A probable failure mechanism for the weft direction IP TMF behaviors of 2.5D-WCs is proposed. This work provides a new benchmark in studying high-temperature fatigue properties of resin matrix 2.5D woven composites.
COMPOSITES COMMUNICATIONS
(2023)
Article
Mechanics
D. Santos, A. Akhavan-Safar, R. J. C. Carbas, E. A. S. Marques, S. Wenig, L. F. M. da Silva
Summary: The rate of fatigue crack growth and fatigue threshold energy release rate are crucial parameters for designing adhesive joints for fatigue service. Different testing strategies, constant load control and constant displacement control, can be used to obtain these parameters through fatigue fracture tests. The effect of testing methodology and temperature on the fatigue behavior of adhesives was investigated for a structural polyurethane adhesive used in automotive applications.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Ahmed Azeez, Robert Eriksson, Viktor Norman, Daniel Leidermark, Johan Moverare
Summary: Exploring crack growth behavior is crucial for accurate fatigue life predictions. In this study, cracked specimens were tested under strain-controlled out-of-phase thermomechanical fatigue conditions. Higher minimum temperature resulted in faster crack growth rates, while the addition of dwell times showed no significant effects. Crack closure was observed in all tests, and the addition of dwell times and change in minimum temperature had little to no effect on crack closure stresses.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Manufacturing
Waluyo Adi Siswanto, Kirill Borodin, Zaid Hamid Mahmoud, A. Surendar, Sami Sajjadifar, Galiya Abdilova, Jun Chang
Summary: This study investigates the effect of aging temperature on the barrel-type solder joint lifetime of electronic devices, finding that as aging temperature increases, the lifetime decreases. The Morrow energy model was identified as the best prediction model when considering aging temperature.
SOLDERING & SURFACE MOUNT TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Shogo Takesue, Motoaki Hayama, Jun Komotori
Summary: This research investigated the effects of atmospheric-controlled induction-heating fine particle peening (AIH-FPP) on the microstructure and fatigue properties of low-alloy steel. The results showed that regardless of the initial microstructure and thermal history, AIH-FPP could refine the grains near the surface through dynamic recrystallization. The treated steel exhibited improved fatigue properties due to the formation of a thick and uniform grain-refined layer, generation of compressive residual stress, and surface hardening. Furthermore, the fatigue properties of the steel were further enhanced with increasing peening temperature.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Electrical & Electronic
Keith A. Jenkins, Alan J. Weger
Summary: A technique is introduced to measure the temperature of a large, dense, CMOS clock buffer while it is operating. The technique utilizes the subthreshold slope of a single pFET, eliminating the need for special technology enhancements for thermal sensing and relying solely on simple electrical measurements. The technique has been demonstrated to work in a realistic test site fabricated in a 14 nm finFET technology.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Multidisciplinary
A. H. Mirzaei, M. M. Shokrieh
Summary: The study developed a generated-dissipated energy model and coupled it with a progressive fatigue damage model to create a self-heating model, successfully simulating the self-heating phenomenon in laminated composites under fatigue loading. Experimental validation demonstrated the model's accurate prediction of temperature rise in composite specimens.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Yiming Zhang, Erping Deng, Jiaqi Guo, Zhibin Zhao, Yan Zhong, Lei Zhang, Xinling Tang, Xiang Cui
Summary: Through finite element simulation with proper combination of boundary conditions, the influence of vertical and lateral temperature difference on electrode warpage was separated and analyzed. The lateral temperature difference was found to be the main reason for electrode warpage, which is different from the current perception, and provides the possibility to directly suppress electrode warpage. Furthermore, the role of the lateral temperature difference was analyzed by a simplified model, revealing that it could be decreased through pure thermal design rather than thermomechanical design. The electrode size and pedestal layout were discussed to alleviate the lateral temperature difference, and simulation results showed significant improvements in pressure and junction temperature distribution. Finally, the junction temperature distribution was measured to verify the root cause and the effectiveness of the improvement using the sequential V-CE(T) method.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Chemistry, Analytical
Alexander Oskolkov, Igor Bezukladnikov, Dmitriy Trushnikov
Summary: The study proposed a method to mitigate and/or resolve the challenges of consistent quality and material homogeneity in FDM/FFF 3D printing by controlling the extruded material temperature rapidly and reliably during the printing process. A high frequency induction heating and an indirect temperature measurement method were used, with a testbed system designed to confirm the effectiveness of the proposed method. The results showed high temperature measurement accuracy and speed in the operating temperature range.
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)