Abstract

The impact experiment of penetrator with enhanced lateral efficiency (PELE) penetrating the metal target plate was carried out to study the fragmentation characteristics of PELE shell made of tungsten alloy. The fragments produced by PELE shell were collected by water tank and classified according to their macromorphology. Scanning electron microscopy (SEM) was used to observe the microstructures of typical fracture surfaces of the fragments. The experimental results show that the macroscopic fracture modes of PELE shell are mainly shear and tensile failure. The fragments formed by the head of PELE shell are small in size, and the fragments have obvious shear fracture surfaces or shear cracks. The PELE shell other than the head part, the larger the size of the fragments near the bottom of the shell and the smaller the number of fragments formed. The fracture modes of the tensile fracture surfaces of the fragments are mainly the cleavage fracture of tungsten particles (W-cleavage), the interfacial separation of tungsten particles and tungsten particles (W-W), and the ductile fracture of bonding phase (M). The cleavage fracture surface of elongated tungsten alloy particles can be clearly observed on the shear fracture surface of the fragments.

摘要

为了研究钨合金PELE弹壳的破碎特性，开展了横向效率增强型穿甲弹（PELE）穿入金属靶板的冲击实验。PELE壳产生的碎片通过水箱收集并根据其宏观形态进行分类。扫描电子显微镜（SEM）用于观察碎片典型断裂表面的微观结构。实验结果表明，PELE壳的宏观断裂模式主要为剪切破坏和拉伸破坏。PELE壳头形成的碎片体积小，碎片有明显的剪切断口或剪切裂纹。除了头部以外的PELE外壳，靠近外壳底部的碎片尺寸越大，形成的碎片数量就越少。破片拉伸断口的断裂方式主要有钨颗粒的解理断裂（W-cleavage）、钨颗粒与钨颗粒的界面分离（WW）和结合相的韧性断裂（M）。在碎片的剪切断面上可以清楚地观察到细长钨合金颗粒的解理断面。