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煤矿液压支架箱式焊接结构的疲劳行为

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

作者信息

Zhao Xiaohui, Li Fuyong, Liu Yu, Fan Yanjun

机构信息

Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun 130025, China.

Zhengzhou Coal Mining Machinery Group Company Limited, Zhengzhou 450016, China.

出版信息

Materials (Basel). 2015 Sep 24;8(10):6609-6622. doi: 10.3390/ma8105325.

DOI:10.3390/ma8105325
PMID:28793586
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5455371/
Abstract

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 (-) curves and fracture mechanism were studied. This research will provide a theoretical reference for the fatigue design of welded structures for hydraulic support.

摘要

液压支架是煤矿开采系统的主要支护设备，在高动态载荷作用下，它们通常会发生疲劳失效。断裂位置一般在应力集中严重的焊接接头处。为了研究并进一步提高液压支架的疲劳强度，本研究首先通过有限元分析确定了可能发生疲劳失效的位置，然后对危险部位的不同焊接接头形式进行了疲劳试验。最后，研究了疲劳强度-寿命（S-N）曲线和断裂机理。该研究将为液压支架焊接结构的疲劳设计提供理论参考。

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