Fatigue life analysis of automotive key parts based on improved peak‐over‐threshold method

Quality & Reliability Eng

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

Jiang

Liu

Quality & Reliability Eng

et al. 2020

Self Cite

“…Therefore, it is necessary to extrapolate the load spectrum from a short distance to a longer distance. Through the grade division and the corresponding frequency statistics, and with the help of the corresponding extrapolation method, the two‐dimensional load spectrum can be obtained 35 . The extrapolation method used in this paper is the parametric extrapolation method.…”

Section: Parameter Correction Of Load Spectrummentioning

confidence: 99%

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

Fatigue Fract Eng Mat Struct

Liu

Jiang

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.

“…[6][7][8] Traditionally, the Palmgren-Miner rule of linear cumulative damage theory has been used to assess the fatigue state of components. 9,10 The Palmgren-Miner rule has the characteristics of simple calculation and easy to use, and has been widely used for fatigue life prediction of parts. However, the Palmgren-Miner rule ignores the load sequence and the interaction between loads, so it cannot guarantee the prediction accuracy of fatigue life, it will not work in some engineering problems.…”

Section: Introductionmentioning

confidence: 99%

Improved numerical model for fatigue cumulative damage of mechanical structure considering load sequence and interaction

Huang

Advances in Mechanical Engineering

Geng

et al. 2021

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To more accurately predict the fatigue life of components under the action of random loads, it is necessary to explore the influence of the interaction between the load sequence and the load on the life prediction. Based on the Manson-Halford method and Corten-Dolan model, this paper establishes a fatigue cumulative damage model that takes into account both the load order and the interaction between loads, and also takes into account the loads near the fatigue limit. The fatigue life of mechanical parts under random load can be calculated through this model, which provides a theoretical basis for life prediction under random load spectrum. The fatigue life of mechanical parts under random load can be calculated through this model, which provides a theoretical basis for life prediction under random load spectrum. Comparing the calculation results of the proposed model with the results of Palmgren Miner, Manson-Halford method, and Corten-Dolan model, it is found that the fatigue damage model established can reasonably predict the fatigue life of parts. Comparison and verification of examples further prove the accuracy and reliability of the proposed model.