结构不对称对斜切口连杆裂解影响分析  

Influence of Asymmetric Structure on the Process of Fracture Splitting Oblique Incision Connecting Rod

作　　者：赵勇[1] 杨慎华 寇淑清[1] 金文明[1] 

机构地区：[1]吉林大学辊锻工艺研究所,吉林长春130022 [2]长春吉扬华欣科技有限责任公司,吉林长春130025

出　　处：《内燃机学报》2012年第2期186-191,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(50375066);高校博士点专项基金资助项目(20060183066);国际科技合作与交流专项基金资助项目(2011DFR70350)

摘　　要：分析了斜切口连杆结构不对称对裂解加工中两侧裂解槽起裂时序及裂解质量的影响.建立了斜切口裂解连杆有限元模型,以试验确定的斜切口连杆材料断裂韧性参数为起裂判据,变化斜切口裂解连杆有限元模型的两侧裂解槽深差,进行了斜切口连杆裂解起裂准静态有限元分析.模拟结果表明,通过优化斜切口连杆两侧裂解槽深度参数可以减小由于结构不对称引起的斜切口连杆裂解加工中两侧裂解槽的起裂时间差.进行了不同槽深情况的斜切口连杆裂解试验研究,通过电测方法测定了试验中斜切口连杆两侧裂解起裂时间差,试验结果与数值模拟结果相比有较好的一致性.Asymmetric structure affects on cracking order and quality when oblique incision connecting rod is split by way of fracture.The finite element models of oblique incision connecting rod with different cracking groove depth were set up.Using this model and the fracture toughness of oblique incision connecting rod material which was measured by test as the onset criterion,the onset of cracking of oblique incision connecting rod fracture splitting was numerically simulated in the quasi-static loading case by FEM software.Simulation results show that the optimization of the depth parameters on both sides of cracking groove of oblique incision connecting rod can reduce the time lag of onset of cracking groove on both sides which is caused by the asymmetric structure in the course of fracture splitting of the oblique incision connecting rod.Experiments of fracture splitting of the oblique incision connecting rod were carried out and the time lag of onset of cracking groove on both sides was measured by electromotive strain method.Good agreement is found between experimental and numerical results.

关 键 词：斜切口连杆 裂解 裂解槽 起裂 

分 类 号：TK406[动力工程及工程热物理—动力机械及工程]