泡沫子弹撞击刚性靶板的理论模型
发布时间：2018-10-10 13:33
【摘要】：Taylor撞击常用于测试材料的动态屈服强度。泡沫压缩密度与压缩应变的关系对泡沫子弹Taylor撞击的理论分析起着重要的作用。本文通过引入塑性泊松比,得到了泡沫压缩密度与压缩应变的准确关系,进一步建立了可压缩泡沫子弹撞击刚性靶板的理论模型。当塑性泊松比为常数时,文中建立的泡沫受压后密度比的一阶泰勒展开式可以退化到已有模型。当塑性泊松比为塑性应变和子弹相对密度的函数时,相对密度会影响泡沫子弹的冲击响应历程及最终变形,但对撞击持续时间影响较小。同时,初始速度也会影响子弹最终变形和撞击持续时间。本文的理论工作可以为分析泡沫材料的动态力学行为提供有益指导。
[Abstract]:Taylor impact is often used to measure the dynamic yield strength of materials. The relationship between compression density and compression strain plays an important role in the theoretical analysis of Taylor impact of foam bullets. By introducing the plastic Poisson's ratio, the accurate relationship between the compression density and the compression strain of the foam is obtained, and the theoretical model of the compressible foam bullet hitting the rigid target plate is further established. When the plastic Poisson's ratio is constant, the first order Taylor expansion of the density ratio of foam under compression can be reduced to the existing model. When the plastic Poisson's ratio is a function of the plastic strain and the relative density of the bullet, the relative density will affect the impact response history and the final deformation of the foam bullet, but has little effect on the impact duration. At the same time, the initial velocity also affects the final deformation and impact duration of the bullet. The theoretical work in this paper can provide useful guidance for the analysis of dynamic mechanical behavior of foam materials.
【作者单位】： 北京航空航天大学航空科学与工程学院;
【基金】：国家自然科学基金(11472035,11472034)~~
【分类号】：O344.2
，
本文编号：2261976
[Abstract]:Taylor impact is often used to measure the dynamic yield strength of materials. The relationship between compression density and compression strain plays an important role in the theoretical analysis of Taylor impact of foam bullets. By introducing the plastic Poisson's ratio, the accurate relationship between the compression density and the compression strain of the foam is obtained, and the theoretical model of the compressible foam bullet hitting the rigid target plate is further established. When the plastic Poisson's ratio is constant, the first order Taylor expansion of the density ratio of foam under compression can be reduced to the existing model. When the plastic Poisson's ratio is a function of the plastic strain and the relative density of the bullet, the relative density will affect the impact response history and the final deformation of the foam bullet, but has little effect on the impact duration. At the same time, the initial velocity also affects the final deformation and impact duration of the bullet. The theoretical work in this paper can provide useful guidance for the analysis of dynamic mechanical behavior of foam materials.
【作者单位】： 北京航空航天大学航空科学与工程学院;
【基金】：国家自然科学基金(11472035,11472034)~~
【分类号】：O344.2
，
本文编号：2261976
本文链接：https://www.wllwen.com/kejilunwen/lxlw/2261976.html
