用改进的基于质点速度测量的拉格朗日分析方法研究尼龙动态力学特性  

Nylon Dynamic Mechanical Behavior Study through a Modified Lagrangian Analysis Based on Particle Velocity Profile Measurement

作　　者：赖华伟[1,2] 王礼立[2] 

机构地区：[1]浙江水利水电高等专科学校市政工程系,杭州310018 [2]宁波大学力学与材料科学研究中心,宁波315211

出　　处：《实验力学》2011年第2期221-227,共7页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目(10872101);浙江省科技局项目(2009C13008)资助;宁波大学王宽诚幸福基金项目资助

摘　　要：采用改进的基于质点速度波形测量的拉格朗日分析方法,研究了率型材料的动态力学性能。首先用高磁感应强度的钕铁硼强磁材料研制出新型磁电式粒子速度计,其性能高于前人文献所报道的性能。其次,在理论分析和数值模拟的基础上得出,用实测的质点速度波形来求应力波形时,实测的应力边界是不可缺少的。在实际研究中,要同时测得质点速度以及应力量是很难的,本文采用Hopkinson压杆技术与拉格朗日分析相结合的新方法解决了这一问题,并对尼龙的动态力学特性进行研究,求得了尼龙的系列动态应力-应变关系曲线。研究证实了该方法的有效性和可靠性。A modified Lagrangian analysis was adopted to study the dynamic mechanical behavior of rate-dependent materials based on particle velocity profile measurement.First of all,the new magneto-electric velocimeter made of Nd-Fe-B magnet was developed,and its magnetic induction is stronger than other velocimeters reported.Secondly,on the basis of theoretical analysis and numerical simulation,it was pointed out that the stress boundary condition experimentally measured is indispensable when the stress wave profiles are to be correctly determined by a set of particle velocity profiles measured.In practice,it is difficult to measure simultaneously both particle velocity wave and stress wave at a Lagrange position in wave propagation experiments.It is reported in this paper that to overcome this difficulty,a new method by combining Lagrangian analysis with Hopkinson pressure bar technique（LA-HPB） was developed to study dynamic mechanical behavior of Nylon.The study also confirms the validity and reliability of the new method.

关 键 词：波传播 磁电式测速计 拉格朗日分析 HOPKINSON压杆 率型本构关系 

分 类 号：O347[理学—固体力学]