The fatigue failure analysis and fatigue life prediction model of FV520B-I as a function of surface roughness in HCF regime

2017 ◽  
Vol 32 (3) ◽  
pp. 634-643 ◽  
Author(s):  
Jin-long Wang ◽  
Yuan-liang Zhang ◽  
Qing-chen Zhao ◽  
Min Zhang ◽  
Ze-ming Guan ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Fatigue Life ◽  
Prediction Model ◽  
Failure Analysis ◽  
Fatigue Failure ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Image Position ◽  
Life Prediction Model

Abstract

Fatigue Life Prediction of Serpentine Interconnects on Soft Elastomers for Stretchable Electronics

2019 ◽  
Vol 87 (1) ◽  
Author(s):  
Shuang Nie ◽  
Min Cai ◽  
Chengjun Wang ◽  
Jizhou Song
Keyword(s):  
Fatigue Life ◽  
Prediction Model ◽  
Fatigue Failure ◽  
Life Prediction ◽  
High Performance ◽  
Theoretical Foundation ◽  
Fatigue Behavior ◽  
Fatigue Life Prediction ◽  
Stretchable Electronics ◽  
Life Prediction Model

Abstract Serpentine interconnects on soft elastomers have been widely used to develop high-performance stretchable electronics. A number of applications demand the system to sustain repetitive loadings, which lead to fatigue failure of serpentine interconnects. In this paper, the fatigue behavior of serpentine interconnects on an elastomeric substrate is investigated experimentally and theoretically. It is shown that the fatigue failure of serpentine interconnects is governed by the failure of the encapsulation layer with the fatigue life determined by the strain level. A fatigue life prediction model, validated by experiments, based on the fatigue modulus concept is established to predict the fatigue life of serpentine interconnects. These results provide physical insights into the fatigue failure of serpentine interconnects and paves the theoretical foundation to predict the fatigue life, thus to study the reliability of stretchable electronics.

An improved fatigue life prediction model for shock absorber cylinder with surface roughness correction

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Haijie Wang ◽  
Xintian Liu ◽  
Que Wu ◽  
Xiaolan Wang ◽  
Yansong Wang
Keyword(s):  
Surface Roughness ◽  
Fatigue Life ◽  
Prediction Model ◽  
Life Prediction ◽  
Shock Absorber ◽  
Fatigue Life Prediction ◽  
Improved Method ◽  
Content Type ◽  
Lateral Forces ◽  
Life Prediction Model

Purpose The purpose of this paper is to obtain a more accurate fatigue life of structures by introducing the surface roughness into fatigue life prediction model. Design/methodology/approach Based on the fatigue life prediction model with surface roughness correction, the shock absorber cylinder is taken as an example to verify the feasibility of the improved method. Based on the load of the shock absorber cylinder during driving, fatigue experiments are performed under longitudinal and lateral forces, respectively. Then, the fatigue life predicted by the modified model is compared with that predicted by the traditional model. Findings By comparing with the test results, considering the influence of mean stress, the Manson method is more accurate in life prediction. Then, the modified Manson-Coffin and Manson method with surface roughness is more accurate in life prediction under longitudinal force and lateral forces, respectively. This verifies the feasibility of the improved method with the surface roughness. Originality/value The research on the influence of surface roughness on fatigue life can lay the technical foundation for the life prediction of products and have great significance to the quality evaluation of products.

Study on Fracture Mechanism and Fatigue Life Prediction for Cutting In-Situ TiB2/7050Al MMCs

2019 ◽  
Author(s):  
Yi-feng Xiong ◽  
Wen-hu Wang ◽  
Kun-yang Lin ◽  
Xiao-fen Liu ◽  
Rui-song Jiang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Fatigue Life ◽  
Prediction Model ◽  
Fracture Mechanism ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Matrix Composites ◽  
Machined Parts ◽  
Life Prediction Model

Abstract For machined parts, the surface roughness and profile would have a significant impact on the fatigue life and fracture mechanism. At present, a lot of research have been carried out on the cutting mechanism, modeling and machining performance of particle reinforced Al-based metal matrix composites. However, the study of fatigue life and fracture mechanism of machined parts after cutting particle reinforced Al-based metal matrix composites is rarely reported. In this paper, the fatigue life and fatigue fracture morphology of in-situ TiB2/7050Al MMCs were studied by high cycle fatigue test under different loading stresses. It was found that the surface roughness influenced the fatigue life greatly. With surface roughness decreasing, the fatigue life of machined parts increased exponentially. The fracture mechanism of cutting in-situ TiB2/7050Al MMCs was found to be brittle fracture due to the existence of fine particles. Besides, a fatigue life prediction model was established based on the machined surface roughness. With validation, the relative errors between prediction model and experiment were smaller than 11% indicating that the proposed fatigue life prediction model of machined in-situ TiB2/7050Al MMCs parts was of good reliability and accuracy.

Fatigue Life Prediction of Buckling String with Cracks in Horizontal Wells of Mining Engineering

2012 ◽  
Vol 577 ◽  
pp. 127-131 ◽  
Author(s):  
Peng Wang ◽  
Tie Yan ◽  
Xue Liang Bi ◽  
Shi Hui Sun
Keyword(s):  
Fatigue Life ◽  
Prediction Model ◽  
Life Prediction ◽  
Horizontal Well ◽  
Drill Pipe ◽  
Prediction Method ◽  
Drill String ◽  
Fatigue Life Prediction ◽  
Mining Engineering ◽  
Life Prediction Model

Fatigue damage in the rotating drill pipe in the horizontal well of mining engineering is usually resulted from cyclic bending stresses caused by the rotation of the pipe especially when it is passing through curved sections or horizontal sections. This paper studies fatigue life prediction method of rotating drill pipe which is considering initial crack in horizontal well of mining engineering. Forman fatigue life prediction model which considering stress ratio is used to predict drill string fatigue life and the corresponding software has been written. The program can be used to calculate the stress of down hole assembly, can predict stress and alternating load in the process of rotating-on bottom. Therefore, establishing buckling string fatigue life prediction model with cracks can be a good reference to both operation and monitor of the drill pipe for mining engineering.

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