压剪联合冲击下聚合物临近界面的失效现象和机理研究

项目名称： 压剪联合冲击下聚合物临近界面的失效现象和机理研究

项目编号： No.11272311

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 唐志平

作者单位： 中国科学技术大学

项目金额： 95万元

中文摘要： 压剪联合冲击下聚合物临近接触界面的失效现象是一种新的绝热剪切失效模式，它只发生于聚合物的临近界面附近，并且形成整个绝热剪切层。目前对于其形成机理和演化规律尚不清楚。本项目试图通过压剪联合冲击实验，各阶段回收试样的显微分析以及数值模拟相结合，弄清该剪切失效层产生的物理机制，揭示其演化发展规律以及各阶段对应的细微观结构特征，建立剪切波衰减幅值与宏观加载参量、材料参数，以及细微观结构参量之间的关联，为人们认识这一现象向前跨进一步。本项目将接触界面力学和绝热剪切带理论交叉结合在一起，可望为聚合物材料和结构在动载下的安全应用提供一种新的失效机制和准则，同时为含能聚合物冲击起爆机理提供新的线索，这对于冲击动力学的深入发展具有很好的学术意义。

中文关键词： 聚合物；近界面；剪切失效；复合应力；耦合应力波

英文摘要： The failure near the contact interfaces of polymers under combined compression and shear impact is a new mode of adiabatic shear failure, which occurs only near the contact interface of polymers and forms an entire adiabatic shear layer. Its mechanism and evolution rules are unclear yet. By combining the experimental study under combined compression and shear impact loading, the micro-observation of the recovery specimens at different evolution stages and the numerical simulation, the present project will try to fully understand the physical mechanism of the failure layer formation, to disclose its evolution law and the micro-configuration features at different stages, and to establish the relations of the shear wave attenuation with the macro-loading conditions, the material properties and the micro and meso structural parameters. After all, people can take a step forward in understanding this phenomenon. The present project will combine the contact interface mechanics with the theory of adiabatic shear band, which can offer a new failure mechanism and criterion for the safe application of polymers and structures. Meanwhile, it can also provide new clues for the impact initiation of energetic polymers. The present investigation will have an academic significance for the further development of impact dynamics.

英文关键词： Polymers；near interface；shear failur；combined stress；coupling stress waves