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Dynamic compression of functionally-graded metal syntactic foams

机译：功能分级金属句法泡沫的动态压缩

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This study addresses the dynamic compression of functionally-graded (FG) metal syntactic foams (MSF). Cylindrical MSFs are manufactured by combining a ZA27 alloy with equal sized layers of expanded perlite (EP) and activated carbon (AC) particles. For comparison, uniform MSFs containing either particle type are manufactured with different aspect ratios. Samples are tested at the loading velocities 0.2 mm.s(-1) (quasistatic) or 284 mm.s(-1) (dynamic) to probe for changes of the deformation mechanism and effective mechanical properties. It is shown that uniform MSFs with a lower aspect ratio exhibit an increased overall strength. The underlying mechanism is a change of the shear failure mode, which has been closely studied by combining infrared (IR) imaging with dynamic compression. EP-MSFs exhibit a strength reduction at the higher loading velocity whereas AC-MSFs show no significant change. The dynamic deformation of FG-MSFs originates in the weaker EP layer and thus closely resembles the deformation behavior of the EP-MSFs. At higher strains, the deformation transitions to the AC layer and the stress-strain response changes accordingly.
机译：该研究解决了功能梯度（FG）金属句法泡沫（MSF）的动态压缩。圆柱形MSF通过将ZA27合金与相等的膨胀铅（EP）和活性炭（AC）颗粒组合而制造。为了进行比较，含有颗粒类型的均匀MSF是用不同纵横比制造的。在加载速度0.2mm，Quasistatic）或284mm，（动态）上测试样品以探测变形机制和有效的机械性能。结果表明，具有较低纵横比的均匀MSF表现出增加的总体强度。底层机构是剪切失效模式的变化，通过将红外（IR）成像与动态压缩相结合，密切研究。 EP-MSFS在较高的加载速度下表现出强度降低，而AC-MSFS没有显着变化。 FG-MSFS的动态变形源自较弱的EP层，从而与EP-MSF的变形行为相似。在更高的菌株处，变形转变为AC层，并且应力 - 应变响应相应地变化。

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