Random fatigue life prediction of automobile lower arm via modified Corten–Dolan model

Abstract

The fatigue life for the rear suspension lower arm of the passenger car is investigated. The road load signals collected by the sextant force measuring instrument are processed. And the frequency histogram of it is plotted and its distribution characteristics are analyzed. The load signal is extrapolated to a cumulative frequency of 10 6 using the parametric method, and the onedimensional load spectrum of the lower arm is compiled. Based on the nonlinear fatigue cumulative damage theory, Corten-Dolan model is modified by introducing the kth power of the stress ratio between two adjacent levels. The improved fatigue life prediction model is established and the validity of the model was determined by experimental data. And the improved Corten-Dolan and the linear cumulative damage model are used to predict the life of the lower arm under one-dimensional load spectrum respectively.

Study on mechanical properties and fracture modes of sandstone with cracks under triaxial compression

“…14,15 Given the impact of stress on the stability and safety of engineering structures under load, it is important to conduct detailed studies on crack propagation. [16][17][18][19] This study investigated the mechanical properties of rocks with varying crack lengths and dip angles through indoor uniaxial compression tests. The results revealed the relationship between mechanical parameters and crack dip angles.…”

“…The extension of these cracks is related to the stress intensity factor (SIF) and can be studied through experimental, theoretical, and numerical methods, with analytical methods being widely used 14,15 . Given the impact of stress on the stability and safety of engineering structures under load, it is important to conduct detailed studies on crack propagation 16–19 . This study investigated the mechanical properties of rocks with varying crack lengths and dip angles through indoor uniaxial compression tests.…”

Programmed system for fatigue life prediction of excavator turntables based on multi-body dynamics and finite element analysis

“…The load spectrum is crucial for assessing fatigue value; however, obtaining an actual load spectrum is complex and costly [ [12] , [13] , [14] ].Consequently, many companies lack essential load data, complicating predictions of product fatigue life during design [ 15 , 16 ].Carpinteri et al [ 16 ]studied multiaxial fatigue under varied amplitude and random loading. Wang et al [ 17 , 18 ] estimated the RCF lifespan of wind turbine carburized gears using a multiaxial fatigue criterion, while Zhu et al [ 19 ]assessed the critical surface criteria of four materials under various loading conditions.Gassne initially proposed the load spectrum concept, which remained undeveloped [ 20 ].…”

Uncertainty for fatigue life of low carbon alloy steel based on improved bootstrap method

“…10,11 Currently, small sample problems have been studied in various fields, including water engineering, aviation, mechanical engineering, and biological engineering. [12][13][14][15] Researchers have proposed different methods to address the unique features of small sample problems, including benchmark methods, 16 machine learning, 17 support vector machines, 18 Monte Carlo methods, 19 Bayesian methods, 20,21 bootstrap methods, 22,23 Bayesian bootstrap methods, 24 and so forth. Among these methods, the bootstrap method is the most representative, which was proposed by Eforn based on the Jackknife method 25,26 using the concept of summary resampling.…”