摘要
利用数值模拟方法研究了在冲击载荷作用下组份成分对称分布的功能梯度板的动态响应。梯度板材料为陶瓷颗粒增强的铝基复合材料(MMC)。增强相体积分数随厚度服从指数定律连续分布,在对称分布条件下增强相体积分数分别在梯度板的前后表面达到最大值。结果显示,在这种功能梯度装甲板中,应力波的传播非常复杂,弹性和粘塑性波耦合在一起,反射拉伸波和卸载波的大小依赖于组份成分沿厚度的分布;等效塑性应变的幅值、动能、弹性应变能及耗散能随时间的变化规律与功能梯度材料组份成分沿厚度的变化密切相关。这些因素对强冲击载荷作用下功能梯度板的优化设计非常重要。
The dynamic response of functionally graded plates was simulated under impulsive load, These plates are supposed to be metal matrix composites （MMC） made from aluminum alloy reinforced by ceramic particles. The reinforcement volume fraction varies continuously along thickness following a power law, The reinforcement volume fraction reaches its maximum at both front surface and back surface with the symmetric distribution. The results show that the stress wave propagations in such gradient structures are very complex. The elastic and viscoplastic waves are coupled together and the amplitude of reflected tension wave and the unloading wave have very close relation with the gradient distribution of the composition. The distributions of equivalent plastic strain, dissipated, kinetic and elastic strain energies are all dependent on the gradient distribution of the composition. All these play a very important role in optimum design of the functionally graded structures under the impact load.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2005年第4期58-67,共10页
Acta Materiae Compositae Sinica
基金
国防基础科研项目(K1801060811)
关键词
功能梯度板
金属基复合材料
颗粒增强
冲击载荷
动态响应
functionally gradient composites plates
metal matrix composites
particle reinforcement
impulsive load
dynamic response
作者简介
李玉龙，博士，教授，研究方向为冲击动力学、复合材料力学 E-mail：liyulong@nwpu．edu．cn
