Nondestructive estimation of remaining fatigue life without the loading history

Abstract

A new nondestructive method to estimate the remaining fatigue life of a fatigue specimen with unknown knowledge of the loading history is presented. It requires only one short-time excitation test. The method utilizes the concept of damage parameter and the temperature rise to reliably predict the remaining number of cycles before fracture. A generalized procedure and numerous experimentally verified examples are presented. It is shown that the method can be applied to both constant and variable stress levels. Extensive laboratory tests reveal that the results of the remaining fatigue life predictions are in very good agreement with measurements.

Rapid evaluation of fatigue limit using energy dissipation

“…Many researchers have used this temperature evolution trend to evaluate fatigue behavior and material deterioration. 13,[38][39][40] For example, Luong 41 proposed a nondestructive method using thermography to evaluate the fatigue strength based on the intrinsic heat dissipation and temperature elevation of automobile components. Wolf et al 42 used the temperature curves of the load increase test to estimate the cyclic yield strength and endurance limit of a magnesium alloy.…”

Entropy-based damage model for assessing the remaining useful fatigue life

“…Furthermore, these models can predict the temperature evolution during fatigue (Mahmoudi and Mohammadi, 2019b) and demonstrate how the temperature rise can be utilized to predict accumulated damage during fatigue. More recently, Jang et al (Jang et al, 2020) presented a methodology wherein the rate of temperature rise at the beginning of the fatigue is used to estimate the remaining fatigue life.…”

“…More recently, Jang et al. (Jang et al., 2020) presented a methodology wherein the rate of temperature rise at the beginning of the fatigue is used to estimate the remaining fatigue life.…”

On the kinetic formulation of fracture fatigue entropy of metals

“…18 Advancing the method, Mehdizadeh and Khonsari, using the FFE concept, developed a procedure to estimate the residual life cycles under variable frequency and loading amplitudes. 19 They noted that this method gives more accurate predictions for low-and high-cycle regimes than applying the linear damage summation rule, fatigue driving stress, or fatigue driving energy approaches. It should be emphasized that the heat dissipated due to the plastic deformation arises from local defects in the material's microstructure, but that due to elastic deformation (also known as internal friction) occurs due to the movement of dislocations.…”

“…Liakat et al developed a procedure to estimate the remaining fatigue life of metals with prior damage based on measuring the slope of the temperature rise during cyclic loading 18 . Advancing the method, Mehdizadeh and Khonsari, using the FFE concept, developed a procedure to estimate the residual life cycles under variable frequency and loading amplitudes 19 . They noted that this method gives more accurate predictions for low‐ and high‐cycle regimes than applying the linear damage summation rule, fatigue driving stress, or fatigue driving energy approaches.…”