摘要
本研究利用“剪切梁”模型，研究了由定常侧压力和周期性的反平面剪切周期载荷共同作用下，层间界面的破坏规律。本文为本研究的第一部分，解析地给出了界面层上剪应力及位移场在卸载(反向加载)过程中的分布规律及演化规律。计算结果表明，由于裂纹前方损伤过程区的存在，卸载是非弹性的，伴随有损伤和摩擦两种耗散机制；另外，当卸载过程不能覆盖加载过程造成的损伤区时，会产生“应力锁死”现象，从而导致结构在以后的加载过程中可能产生冲击载荷。
The interface failure under the joint action of constant compression and periodical anti-plane shear is investigated. With the so-called 'shear beam model', analytical solutions are developed for the evolution law and the distributions of shear stress and displacement along the entire length of the interface during unloading processes. Results indicate that, owing to the existing of the damage process zone ahead of the crack tip, unloading is inelastic and accompanied by friction and damage dissipation. Furthermore, 'stress locking' occurs if unloading process does not cover the damage zone left by loading process. Consequently, 'shocking load' may occur in ensuing reloading process.
出处
《工程力学》
EI
CSCD
北大核心
2001年第3期97-104,共8页
Engineering Mechanics
基金
欧盟课题(INCO-Copernicus
ERBIC 15 CT970706)
东北大学青年科学基金课题(856049)
