Dynamic Compression and Damage Pattern of Hollow Microsphere/Aluminum Alloy Composites
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摘要: 采用压力浸渗法制备空心球/铝合金复合材料，并利用分离式Hopkinson压杆（SHPB）对其进行动态压缩实验。利用扫描电子显微镜（SEM）观察动态压缩后回收样品的显微结构，重点分析动态压缩后复合材料内部脆性空心球的微观损伤破碎模式。用LS-DYNA显式有限元软件对复合材料单胞模型动态压缩过程进行数值模拟，重现了内部空心球的损伤演化与破碎过程。结果表明，空心球/铝合金复合材料应力-应变曲线表现出明显的多孔介质压缩特征，即可划分为弹性、塑性崩塌和致密化3个变形阶段；随着压缩量的增大，材料内空心球损伤破碎模式由沿经线劈裂状裂纹逐渐过渡到在赤道方向的破碎，并最终崩塌。
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关键词:
- 动态损伤破碎 /
- 分离式Hopkinson压杆实验 /
- 铝基复合材料
Abstract: The hollow microsphere/aluminum alloy composites were fabricated by press infiltration. The dynamic compression behavior of the composites was investigated by using split Hopkinson pressure bar (SHPB). The microstructure of the specimen after compression was characterized by scanning electron microscopy, and the damage patterns of the hollow microsphere were primarily studied. A single-cell model of the composites was established, and the dynamic compression process of the single-cell was simulated by using the LSDYNA explicit finite element software. With dynamic loading, mechanical behavior of hollow microsphere/aluminum alloy composites showed three typical stages: elastic deformation, plastic collapse and densification. With the increasing of the decrement, the hollow microsphere appeared cracks along the meridians, gradually transitioned into the fragmentation of the equator, and eventually collapsed. -
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