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METAL ENCAPSULATED MMC MACROCOMPOSITES

机译：金属封装的MMC宏观复合材料

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摘要

Metal matrix composites (MMCs) combine the desirable characteristics of metals (ductility, thermal conductivity) and ceramics (high hardness, high stiffness, low thermal expansion). For many armor (multi-hit capability) and structural applications, ductility is very critical. In this work, a metal-encapsulated-MMC macrocomposite system was evaluated for achieving high ductility. Numerical modeling showed that significant confining compressive stress (260 MPa) can be generated in the MMCs due to the constraint/confinement by a higher-CTE, ductile steel encapsulant. Eighteen different types of macrocomposite tensile and shear test samples were fabricated with three MMC types, two different steel encapsulants (low CTE mild steel and high CTE stainless steel), and three different encapsulant-MMC ratios. While the MMCs showed less than 1% failure strain, the macrocomposites showed failure strains closer to those of the encapsulating steel. Macrocomposite samples with stainless steel surround showed higher than rule-of-mixtures (ROM) elongation, specific YS, and specific UTS, as well as higher specific energy than Ti-6-4 and 5083 aluminum.
机译：金属基复合材料（MMCS）结合了金属（延展性，导热率）和陶瓷（高硬度，高刚度，低热膨胀）的理想特性。对于许多盔甲（多次击中能力）和结构应用，延展性非常关键。在这项工作中，评估了一种金属包封-MMC宏观复合体系，以实现高延性。数值建模表明，由于高CTE，延性钢密封剂的约束/限制，可以在MMC中产生显着的限制压缩应力（260MPa）。用三种MMC类型，两种不同的钢密封剂（低CTE温和钢和高CTE不锈钢）和三种不同的密封剂-MMC比制造十八种不同类型的宏观复合拉伸和剪切试验样品。虽然MMCs显示出低于1％的失效应变，但宏观复合材料显示出更接近封装钢的菌株的失效菌株。具有不锈钢环绕的宏观复合样品显示出高于混合物规则（ROM）伸长，特定Ys和特定UTS，以及比Ti-6-4和5083铝更高的特定能量。

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