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Mechanical response of discontinuous ceramic fiber reinforced metal matrix composites under quasi-static and dynamic loadings

机译：准静态和动态载荷下不连续陶瓷纤维增强金属基复合材料的力学响应

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摘要

The quasi-static mechanical properties and ballistic impact performance of several discontinuous ceramic fiber (Saffil) reinforced Al-2% Cu metal matrix composites (MMC) are characterized. The ballistic penetration resistance of the materials are determined against a fragment simulating projectile and compared to the performance of the baseline matrix alloy. Digital image correlation with high speed photography is used to measure the full field deflection of the materials during impact. Mechanical behavior and post-mortem fracture analysis are used to relate material properties to performance in penetrating and non-penetrating impact events. It is demonstrated that the MMC materials exhibit a strong asymmetry in their tensile and compressive responses. The MMC materials are stronger in compression and the asymmetry in response increases with increasing volume fraction of fiber. It was found that the ballistic performance (V_(50)~(BL)) decreases when the volume fraction of fiber is greater than 3% due to the decrease in tensile strain to failure at higher volume fractions. In non-penetrating impacts the increased stiffness and strength with higher volume fractions greatly reduces the magnitude and distribution of plate deflection.
机译：表征了几种不连续陶瓷纤维（Saffil）增强的Al-2％Cu金属基复合材料（MMC）的准静态力学性能和弹道冲击性能。确定材料对模拟弹丸的碎片的防弹穿透强度，并将其与基准基体合金的性能进行比较。数字图像关联和高速摄影技术可用于测量冲击过程中材料的全场偏转。力学行为和验后断裂分析用于将材料属性与穿透和非穿透冲击事件中的性能相关联。事实证明，MMC材料在拉伸和压缩响应方面表现出很强的不对称性。 MMC材料的压缩力更强，响应的不对称性随纤维体积分数的增加而增加。发现当纤维的体积分数大于3％时，由于在较高的体积分数下拉伸至破坏的拉伸应变降低，所以弹道性能（V_（50）〜（BL））降低。在非穿透冲击中，增加的刚度和强度以及更高的体积分数会极大地减小板变形的大小和分布。

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