Fatigue Test and Fatigue Reliability Evaluation of Loader Working Device

doi:10.12141/j.issn.1000-565X.190921

Journal of South China University of Technology (Natural Science Edition) ›› 2020, Vol. 48 ›› Issue (8): 108-114.doi: 10.12141/j.issn.1000-565X.190921

• Mechanical Engineering • Previous Articles Next Articles

Fatigue Test and Fatigue Reliability Evaluation of Loader Working Device

WAN Yipin¹ SONG Xuding¹ YUAN Zhengwen²

1． Key Laboratory of Ｒoad Construction Technology and Equipment of the Ministry of Education，Chang＇an University，Xi＇an 710064，Shaanxi，China; 2． Engineering Machinery Ｒesearch Institute of Xuzhou Construction Machinery Group，Xuzhou 221004，Jiangsu，China

Received:2019-12-23 Revised:2020-03-15 Online:2020-08-25 Published:2020-08-01
Contact: 万一品(1988-)，男，博士，讲师，主要从事结构疲劳与断裂、抗疲劳设计研究。 E-mail:wyipin@chd.edu.cn
About author:万一品(1988-)，男，博士，讲师，主要从事结构疲劳与断裂、抗疲劳设计研究。
Supported by:
Supported by the National Key Technology R＆D Program of China (2015BAF07B02)

Abstract

Abstract: In order to design an anti-fatigue loader working device and evaluate its fatigue reliability，two dimen-sional load spectrum of the fixed attitude equivalent external load of the ZL50G loader was obtained． Loading spec-trum of accelerated fatigue test and the fatigue reliability evaluation of very small samples were carried out． The results show that 35. 88h of acceleration loading spectrum can be equivalent to 495. 67h of continuous operation of loader，and the purpose of fast fatigue test of working device is realized． The average actual fatigue life of the wor-king device is 9132. 20h． The main cause of fatigue fracture is the weld toe crack near the boom plate． Based on the fatigue reliability evaluation of very small samples with given working life and fatigue life test results，the cubic polynomial of the mathematical relationship between the life and reliability of the working device was obtained．

Key words: loader, working device, load spectrum, fatigue test, reliability

WAN Yipin SONG Xuding YUAN Zhengwen. Fatigue Test and Fatigue Reliability Evaluation of Loader Working Device[J]. Journal of South China University of Technology (Natural Science Edition), 2020, 48(8): 108-114.

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Fatigue Test and Fatigue Reliability Evaluation of Loader Working Device

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