Fracture Failure Analysis of Insulation with Initial Crack Defect for Stator End-winding in Induction Motor by Using Magnetic-structural Coupling Model

Destructive and nondestructive remaining fatigue life prediction methods of metals: a review

Simulation study on breakdown evolution of tri-post insulator under electric-mechanical-thermal stresses in 1100 kV HVAC-GIL

Bone structures facilitate the regeneration and repair of bone tissue in regions where it has been damaged or destroyed, either temporarily or permanently. Therefore, the bone's fatigue strength and durability are crucial to its efficacy and longevity. Several variables, such as the construct's material qualities, design, and production procedure, loading and unloading cycles, and physiological conditions influence the endurance life of bone constructs. Metals, ceramics, and polymers are all routinely utilized to create bone substitutes, and each of these materials has unique features that might affect the fatigue strength and endurance life of the final product. The mechanical performance and capacity to promote bone tissue regeneration may be affected by the scaffold's design, porosity, and pore size. Researchers employ mechanical testing under cyclic loading circumstances as one example of an experimental approach used to assess bone construction endurance. These analyses can give us important information about the stress-strain behavior, resistance to multiple loading cycles, and fatigue strength of the new structure. Predicting the endurance life of the developed construct may also be possible with the use of simulations and numerical analyses. Hence, in order to create reliable and efficient constructs for bone tissue engineering, it is crucial to understand their fatigue strength and durability. The purpose of this study is to analyze the effective parameters for fatigue strength of bone structures and to gather the models and evaluations utilized in endurance life assessments. 

Finite element analysis and in vitro tests on endurance life and durability of composite bone substitutes

The pantograph is a critical subsystem of high-speed trains. During train operation, the pantograph undergoes dynamic interactions with the overhead contact wire, including the effects of alternating loads and crosswinds. These interactions can lead to various faults, such as contact strip wear and upper frame cracking. Conventional detection of upper frame cracks primarily relies on visual inspections during routine maintenance, which may result in missed detections and lack timeliness. To address this issue, this paper proposes a strain mode-based method for identifying upper frame cracks in pantographs. Compared to displacement mode, strain mode exhibits higher sensitivity to cracks, even at the early stage of crack initiation, and thus enables more effective detection by comparing with healthy components. Further discussion reveals that low-order strain modes demonstrate good identification performance for both single and dual cracks. Subsequently, two additional methods are proposed: one based on the rate of change in strain modes and the other combining the second-order strain mode with symmetry analysis. Both methods show strong capabilities for crack identification. Moreover, the paper analyzes crack-induced damage severity based on strain mode characterization, revealing that the damage severity increases with crack propagation. Finally, an online monitoring scheme based on this method is briefly discussed, offering a pre-detection approach to support crack detection during maintenance. 

Strain mode analysis for crack identification in the upper frame of a pantograph

Fatigue Crack Propagation Model and Life Prediction for Pantographs on High-Speed Trains Under Different Service Environments

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Fatigue Crack Propagation Model and Life Prediction for Pantographs on High-Speed Trains Under Different Service Environments