A modified quality loss model of service life prediction for products via wear regularity

Quality & Reliability Eng

Wang

et al. 2020

Self Cite

To further study the law of strength degradation, the residual strength degradation model is established based on the definition of fatigue damage, considering the interaction of various uncertain factors and time factors in service environment. Combined with equivalent damage model, a nonlinear cumulative damage model is proposed, which takes the interaction among loading loads into account and improves the accuracy of calculation. Additionally, the equivalent transformation of multistage load is studied using interval theory. According to the interval dynamic nonprobability reliability prediction model, a dynamic reliability analysis of the interval model is carried out. Dynamic reliability of the component is analyzed under multistage load accumulation damage to verify the effectiveness of the method.

Section: Introductionmentioning

confidence: 99%

Interval dynamic reliability analysis of mechanical components under multistage load based on strength degradation

Quality & Reliability Eng

Wang

et al. 2020

Self Cite

“…There are many factors affecting the fatigue life of metals. 21,22 Under the action of cyclic load, the fatigue performance of metal decreases continuously, and the cumulative damage of parts makes it to produce fatigue damage continuously. 23 After fatigue damage reaches a certain level, it leads to fatigue failure of the components and endangers the driving safety of the car.…”

Section: Statement Of Problemsmentioning

confidence: 99%

“…The vehicle stabilizer bar is an important safety component on the independent suspension of the automobile; it is also a weak area in the structure of the car. There are many factors affecting the fatigue life of metals 21,22 . Under the action of cyclic load, the fatigue performance of metal decreases continuously, and the cumulative damage of parts makes it to produce fatigue damage continuously 23 .…”

Section: Statement Of Problemsmentioning

confidence: 99%

Prediction and evaluation of fatigue life for mechanical components considering anelasticity‐based load spectrum

Wang

Fatigue Fract Eng Mat Struct

et al. 2020

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To accurately predict the degraded fatigue life of components under random loads, anelasticity effect of metal on life estimation needs to be explored. Weighting coefficient and dynamic elastic modulus are introduced to modify the calculation process of the model. By establishing an equal-amplitude fatigue median surface and applying Miner linear fatigue cumulative damage theory, a fatigue life prediction model of the component under random loads is proposed. The model can be used to calculate the degraded fatigue life of components, which provides a theoretical basis for life estimation under random load spectrum. The two-dimensional load spectrum is compared with the unprocessed two-dimensional load spectrum and the one-dimensional program spectrum in life prediction results. With the comparison of the target life and simulation life and the data calculated by the model of the automobile front stabilizer bar, it is concluded that the data obtained by the modified model are more reasonable and accurate.

“…Ju and Wu (2016) used the newly proposed intrinsic strain to establish a damage evolution model for multi-fiber reinforced composites. Some scholars predict the parts fatigue life by mathematical models (Liu et al, 2020a(Liu et al, , 2020b.…”

Section: Introductionmentioning

confidence: 99%

An improved nonlinear cumulative damage model for strength degradation considering loading sequence

International Journal of Damage Mechanics

Zhang

et al. 2020

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In order to determine the effect of different loads on fatigue damage, a strength degradation model is proposed according to the law of residual strength degradation of metal materials. The model is verified with the strength degradation test data, and the results show that the model can describe the strength degradation process of general metal materials well. Combined with the strength degradation model, an improved equivalent damage model for different loading sequences is proposed. On this basis, a nonlinear fatigue cumulative damage model based on strength degradation is derived. The cumulative damage model is applied to the estimation of fatigue residual life under two-, three-, and four-stage loads to investigate the effects of different loading sequence on fatigue damage under various loading conditions. Combining with experimental data, it is verified that the cumulative damage model can accurately estimate the fatigue life under two-, three-, and four-stage loads.