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首页> 外文期刊>JSME International Journal. Series A, Solid mechanics and material engineering >Micro Damage Evolution Analysis of Target Impacted by Projectile
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Micro Damage Evolution Analysis of Target Impacted by Projectile

机译：弹丸撞击目标的微损伤演化分析

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摘要

A new dynamic stress-strain rate type constitutive model for mixed hardening material has been developed using evolutional Gurson type yield function for solving problems of rigid plastic porous materials. During the plastic process of ductile materials in many engineering problems, the failure of materials is mainly induced by the damage behaviors such as the nucleation of micro void, their evolutions and the coalescence. With the aid of some concept of parameters and formulations, such as generalized triaxiality function in stress space, void fraction, effective stress with micro void interaction and void induced effective strain rate, generalized triaxiality ratio and so on, the dynamic void evolutional process of mixed hardening material has been analyzed in detail. Based on the above constitutive law the rigid-plastic finite element modeling and the FEM computer system including the damage evolutional process have been developed. The micro damage phenomena caused by collision of a flying projectile on to a target is simulated in order to reveal the applicability of the method. The inherent relations between the penetration and perforation process, and damage evolution process during the impact of target plate by projectile are revealed.
机译：利用演化Gurson型屈服函数，开发了一种新的混合硬化材料动应力-应变率类型本构模型，用于解决刚性塑料多孔材料的问题。在延性材料塑性加工过程中遇到的许多工程问题中，材料的失效主要是由破坏行为引起的，例如微空隙的形核，其演化和聚结。借助一些参数和公式的概念，例如应力空间中的广义三轴性函数，空隙率，具有微小空隙相互作用的有效应力和空隙引起的有效应变率，广义三轴率等，混合的动态空隙演化过程已经对硬化材料进行了详细分析。基于以上本构定律，开发了包括损伤演化过程的刚塑性有限元建模和有限元计算机系统。为了揭示该方法的适用性，模拟了由飞行弹丸撞击目标引起的微损伤现象。揭示了弹丸对靶板撞击过程中侵彻和穿孔过程与损伤演化过程之间的内在联系。

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