小吨位桁架臂起重机K节点疲劳试验方法  

Research on Fatigue Test Method of K-joints for Small-tonnage Lattice Boom Cranes

作　　者：王欣[1] 杨绍坤[1] 金三强 贾兴军[2] 

机构地区：[1]大连理工大学机械工程学院,辽宁大连116024 [2]中海油能源发展股份有限公司油田建设工程分公司,天津300452

出　　处：《实验室研究与探索》2016年第3期13-16,共4页Research and Exploration In Laboratory

基　　金：国家863计划项目(2012AA041804);国家质检总局科技计划(2014QK093);中海油能源发展股份有限公司科技项目(HFKJ-YJ1305);江苏省产学研联合创新资金项目(BY2012089)资助

摘　　要：通过数值模拟比较了3种目前关于K节点的试验加载方法,提取焊趾处的热点应力进行对比分析。结果表明,第1种和第3种加载方法可行,而第3种加载方法更易于实验。故采用第3种加载方法,以25 t级桁架臂起重机K节点为试验对象,进行了静载应力测试,测试结果与数值模拟结果吻合性较好,进一步表明第3种加载方式的合理性与可行性。这为桁架臂起重机K节点疲劳破坏试验方案提供了理论依据。K-joint in small-tonnage lattice boom crane is an important structure connection and the main fatigue damage point. So it is necessary to do fatigue test for K-joints,and reasonable loading method is the key to obtain reliable test result. By numerical simulation in three different loading methods of K-joint testing,the hot spot stress of the weld toe is obtained for comparative analysis. It proves that both the first method and the third method are feasible. Furthermore,the third method is easily implemented. Then,as an example,a 25-ton lattice boom crane is tested by using the third method to test the stress of K-joint. The test data and the FEA results are in good agreement,the fact further demonstrates the rationality and feasibility of the third method. The theoretical basis of K-joint fatigue test in smalltonnage lattice boom cranes is provided.

关 键 词：桁架臂起重机 K节点 疲劳试验 加载方式 应力测试 

分 类 号：TG405[金属学及工艺—焊接]