Abstract
AbstractA 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.
Highlights
Components in engineering are susceptible to fatigue and fracture if they are subjected to cyclic loads under operating conditions, which can lead to reduced usage or, in the worst case, to failure if threshold values are exceeded
From the view of continuum damage mechanics (CDM), fatigue damage is a process of accumulation that once reaches a critical state, the structural elements contain failures and cannot be serviced
The accumulation of entropy generated during a fatigue test is calculated and regarded as a material property named the fatigue fracture entropy (FFE), where this parameter stays constant for a certain material until failure
Summary
Components in engineering are susceptible to fatigue and fracture if they are subjected to cyclic loads under operating conditions, which can lead to reduced usage or, in the worst case, to failure if threshold values are exceeded. Classical and statistics-based methods derived from entropy have been proposed to evaluate the fatigue damage as well as the remaining lifetime of materials and structures.[23,24,25,26] The accumulation of entropy generated during a fatigue test is calculated and regarded as a material property named the fatigue fracture entropy (FFE), where this parameter stays constant for a certain material until failure This parameter is independent of loading sequences, frequency, amplitudes, and so forth,[27] and affects the fatigue such as damage evaluation,[28] temperature response,[29] and reliability[30] of the material. The results obtained are discussed with regard to the concept of entropy under plastic deformation, and conclusions are drawn
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