Stress-Strain Behavior of Media Composed of Multi-Sized Granules

本研究的目的是研究 从微观结构的角度来看， 应力应变关系 本研究的重点是 建立大应变时的应力-应变关系 将研究的连续表示问题 特别注意从根本上理解 颗粒系统的行为，如能量耗散，应力， 非线性特性等。 通过重新界定连续体， 变量，应力和应变，在接触力方面， 微观几何测量 应力-应变关系将 通过考虑滑动和旋转的发展， 粒子 该理论将被扩展到由 多尺寸和非球形颗粒。 杆件与计算机组合的实验研究 仿真将进行，以帮助发展的理论。 实验研究和计算机的结果 模拟沿着从自然的研究数据 颗粒系统，如沙子，将用于验证 发展理论。

The objective of this research is to study the mechanics of granular material from micro-structural point view to obtain the stress-strain relationship. The focus of this research is to formulate the stress-strain relationship for large strain problems with a continuum representation which will be studied with particular attention to the fundamental understanding of the behavior of granular systems, such as energy dissipation, stress- dilatancy characterists, etc.. The objective will be achieved by redefining the continuum variables, stress and strain, in terms of contact forces and micro geometrical measures. The stress-strain relationship will be developed by considering the sliding, and rotation of the particles. The theory will be then extended for pickings made of multi-sized and non-spherical shape particles. Experimental studies on assemblies of rods and computer simulation will be conducted to aid the development the theory. the results from the experimental studies and computer simulation along with the available date from studies on natural granular systems, such as sands, will be used to validate the developed theory.