Ultrasonic fatigue damage behavior of 304L austenitic stainless steel based on micro-plasticity and heat dissipation

He, Chao; Tian, Ruifeng; Liu, Yongjie; Li, Jiukai; Wang, Hongtao

doi:10.1016/s1006-706x(15)30051-0

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…Therefore, the microstructural changes in grain size as shown in Figure 2(c) exert little influence on the mechanisms of fatigue crack initiation. This differs from the results of many previous studies that microstructural plasticity evolution in large grains generally initiates fatigue crack [33,34]. However, an area of shrinkage porosity has been detected at the crack initiation site as shown in Figure 6, indicating a close relationship between the formation of shrinkage porosity and the fatigue crack initiation.…”

Section: Fatigue Crack Initiationcontrasting

confidence: 99%

Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint

Kitamura

Yang³

et al. 2017

Advances in Materials Science and Engineering

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Very high cycle fatigue behavior of nugget zone in AA 7075 friction stir welded joint was experimentally investigated using ultrasonic fatigue testing system (20 kHz) to clarify the crack initiation mechanism. It was found that the fatigue strength of nugget zone decreased continuously even beyond 10 7 cycles with no traditional fatigue limits. Fatigue cracks initiated from the welding defects located at the bottom side of the friction stir weld. Moreover, a special semicircular zone could be characterized around the crack initiation site, of which the stress intensity factor approximately equaled the threshold of fatigue crack propagation rate. Finally, a simplified model was proposed to estimate the fatigue life by correlating the welding defect size and applied stress. The predicted results are in good agreement with the experimental results.

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Section: Fatigue Crack Initiationcontrasting

confidence: 99%

Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint

Kitamura

Yang³

et al. 2017

Advances in Materials Science and Engineering

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“…24,26,37 The constant W p is given as a default constant, since the above parameters are determined constantly for a fatigue test. However, numerous studies [38][39][40][41][42][43][44][45][46][47] have shown that the temperature evolution of a specimen or a component that had been exposed to a load amplitude higher than its fatigue limit appears in three stages, which is schematically represented in Figure 2. This can be divided into an initial temperature increase (Stage 1), a predominant temperature stabilized stage (Stage 2) and a sudden temperature increase stage close before fracture (Stage 3).…”

Section: Second Law Of Thermodynamicsmentioning

confidence: 99%

Thermodynamic entropy as a marker of high‐cycle fatigue damage accumulation: Example for normalized SAE 1045 steel

Teng

Boller

et al. 2020

Fatigue Fract Eng Mat Struct

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A nondestructive thermographic methodology is utilized to determine the fracture fatigue entropy for evaluating the fatigue damage in metals within the high-cycle fatigue regime. Thermodynamic entropy is shown to play an important role in the fatigue process to trace the fatigue damage as an irreversible degradation of a metallic material being subjected to cyclic elastic-plastic loading. This paper presents a method to evaluate fatigue damage in the normalized SAE 1045 steel being based on the concept of thermodynamic entropy and its nonlinearities. The procedure looks to be applicable to constant and load increase tests proven by experiments.

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“…When the stress amplitude during loading exceeds the fatigue limit for most metallic materials and microplasticity becomes a limiting factor in the material's lifespan, the temperature evolution can be divided into three phases, [22][23][24][25] the typical temperature syllogism is schematic in Figure 1, 26,27 such as:…”

Section: Phenomenologically Based Modelsmentioning

confidence: 99%

Thermo‐based fatigue life prediction: A review

Teng

2023

Fatigue Fract Eng Mat Struct

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The main objective of this review paper is twofold: Recall the most captivating areas of research in predicting the fatigue life of metals with the application of thermal methodology, particularly for the stress‐controlled fatigue tests. The explicit lifetime models reviewed have been developed by scholars over the past two decades owing to the advancements in infrared thermal imaging technology. Introduce, discuss, and conclude a broad range of alternative theoretical frameworks in thermodynamics. Some investigations are made with the previous methods, including the most recent evolutions of lifetime models for structural integrity across various fields. Some future perspectives are provided in final, which could pave the way for a new realistic or potential capability.

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Ultrasonic fatigue damage behavior of 304L austenitic stainless steel based on micro-plasticity and heat dissipation

Cited by 9 publications

References 27 publications

Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint

Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint

Thermodynamic entropy as a marker of high‐cycle fatigue damage accumulation: Example for normalized SAE 1045 steel

Thermo‐based fatigue life prediction: A review

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