金属蜂窝异面压缩下平均压缩应力的理论模型.pdfVIP

Vo 1.46 NO.18 第46 卷第 18 期 机械工程学报 2010 年 9 月 JOURNAL OF MECHANICAL ENGINEERING Sep. 2010 DOI: 10.3901/J如fE.2010.18.052 金属蜂窝异面压缩下平均压缩应力的理论模型* 罗昌杰周安亮刘荣强邓宗全李萌 (哈尔读工业大学机电工程学院 哈尔滨 150001) 摘要:为了得出蜂窝材料在静态压缩及冲击加载下的异面压缩力学行为，基于蜂窝材料的对称性特点，以 Y 形蜂窝胞元为 研究对象，根据能量守恒原理，将Y 形蜂窝胞元所吸收的能量等效为塑性绞转动所需要的能量与 Y 形蜂窝胞元壁转动所需 要的能量之和，在此基础上，分别采用 Mises 屈服准则和 Tresca 屈服准则推导蜂窝材料在静态压缩下的平均压缩应力的理论 模型。基于 Co叩er-Symonds 模型考虑应变率对Y 形蜂窝胞元材料力学性能的影响，推导蜂窝材料动态平均压缩应力的理论 模型。通过一系列的试验，验证了基于 Tresca 屈服准则推导的蜂窝材料在异面压缩下的平均压缩应力理论模型的正确性。 关键词:蜂窝材料异面压缩静态平均压缩应力动态平均压缩应力理论模型 中图分类号: TB30 Average Compressive Stress Constitutive Equation of Honeycomb Metal under Out-oιplane Compression LUO Changjie ZHOU Anliang LIU Rongqiang DENG Zongquan LI Meng (School ofMechatronic Engineering , Harbin Institute ofTechnology, Harbin 150001) Abstrad: To obtain the compressive behavior ofhoneycomb structures un也r out-of-plane static compression or impact load, based on the symmetric structure of the honeycomb structures and law of energy conservation, the sum of the needed energy for the plastic hinge rotation and en町gy for the Y-type honeycombs cell wall rotation is 饱kenωbe equivalentωtheωtal absorbed energy based on the Y-type honeycomb cell. 8ased on 也is， av町age compressive stress constitutive equation under out-of-plane compression is deduced with Mises yield criterion and Tresca yield criterion. Considering the effect of strain rate on its mechanical characteristics based on the Cowper-Symonds model , dynamic av町age compressive stress calculating equation is deduced. A series of tests prove 也e correctness of the constitutive equation of the honeycomb structures und缸 out-of-plane compression based on the Tresca yield criterion. Key words: Honeycomb strucωr