摘要
本文应用现代较先进的Ｃｒａｎｚ－Ｓｃｈａｒｄｉｎ超高速记录系统，对人体下颌骨简化后的平面光弹性模型，在承受水平方向冲击载荷时所引起的瞬态动应力进行了实验研究，获得瞬态动应力的变化和分布规律．依靠动光弹所获得的等色线与等倾线资料，结合有限差分法求解动态泊松方程来实现动态主应力分离．并采用落锤冲击－维模型求出了光弹性材料的动态力学特性．文章系统总结了动态光弹性方法，并将该方法引入生物力学的研究领域，研究结果在医学、军事、体育等方面均具有实际的意义．
In this paper the dynamic stresses in a simplified photoelastic model of human mandible which is subjected to impact load in the horizontal direction have been studied by means of the advanced Cranz-Schardin ultrahigh sped camera system. The variation and distribution of the transient dynamic stresses are obtained. The separation of the dynamic principal stresses in the model is completed by solving the dynamic Poisson's equation with the transient dynamic isochromatics and isoclinics of the model combined with the finite difference method. The dynamic mechanical properties of the photoelastic material are also determined by impacting a one-dimensional model with a falling hammer.
关键词
光弹性
应力分析
下颌骨
photoelasticity
stress analysis
dynamics
mandible
