循环载荷下层间界面反平面剪切破坏的解析解:2.再加载及综合响应分析

ANALYTICAL SOLUTION FOR INTERFACE FAILURE UNDER CYCLIC LOADING:2.RELOADING BEHAVIOR AND SYNTHESIS OF RESPONSE

  • 摘要: 本研究利用“剪切梁”模型,研究了在定常侧压力和周期性的反平面剪切载荷共同作用下,层间界面的破坏规律。本文为本研究的第二部分。对应一个完整的载荷周期,解析地给出了界面层上剪应力及位移场在再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,当再加载过程不能覆盖卸载过程造成的损伤区时,会产生新的“应力锁死”现象。文末对结构整体的载荷-位移行为的分析,揭示了周期载荷作用下的两种结构响应模式:1) 接触塑性安定;2) 增量破坏。

     

    Abstract: In this study, the interface failure under the joint action of constant compression and periodical anti-plane shear were investigated. This paper is the second part of this study. With the so-called “shear beam model”, analytical solutions were presented for the evolution law and distributions of shear stress and displacement along the entire length of the shear beam during reloading processes. Results indicate that, owing to the existing of the damage process zone ahead of the crack tip, reloading is inelastic from the beginning. Furthermore, “stress locking” always occurs if a loading process cannot cover the damage zone left by its neighboring loading process. Analysis of synthesis of response presented at the end of the paper reveal two modes of structural responses: 1) contact plastic shakedown and 2) progressive failure.

     

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