Fatigue Behavior of a Box-Type Welded Structure of Hydraulic Support Used in Coal Mine

Materials

Xiaohui Zhao²  Fuyong Li¹  Yu Liu³  Yanjun Fan² 

[1] Zhengzhou Coal Mining Machinery Group Company Limited, Zhengzhou 450016, China;Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun 130025, China;;School of Mechanical Science and Engineering, Jilin University, Changchun 130025, China

关键词: hydraulic support;    finite element;    stress concentration;    weld;    fatigue;   

DOI  :  10.3390/ma8105325

来源: mdpi

【 摘 要 】

Hydraulic support is the main supporting equipment of the coal mining systems, and they are usually subjected to fatigue failure under the high dynamic load. The fracture positions are generally at welded joints where there is a serious stress concentration. In order to investigate and further improve the fatigue strength of hydraulic support, the present work first located the possible position where fatigue failure occurs through finite element analysis, and then fatigue tests were carried out on the different forms of welded joints for the dangerous parts. Finally, Fatigue strength-life (S-N) curves and fracture mechanism were studied. This research will provide a theoretical reference for the fatigue design of welded structures for hydraulic support.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.