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

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滋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...

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

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.