An engineering method for triaxial hydrostatic compression of metallic foam is presented to preferentially alter the foam's microstructure. The method is demonstrated on an assortment of open-cell aluminum foams with varying pore size and porosity. Measurements of acoustic absorption indicate that the compressed samples absorb significantly more sound than the conventional samples of equal thickness in the test range from 0.25 to 4 kHz. The acoustic absorption trends that result from the transformation of foam microstructure in the compressed samples are a function of the initial pore size and porosity. An analysis is presented which links the microstructure properties of compressed foam samples to conventional samples, thereby providing a means to estimate acoustic absorption trends for compressed samples through use of existing models.

中文翻译：

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三轴静液压压缩后，金属泡沫吸收的声音。

提出了一种对金属泡沫进行三轴静水压缩的工程方法，以优先改变泡沫的微观结构。该方法在各种孔径和孔隙率变化的开孔铝泡沫中得到证明。声学吸收的测量结果表明，在0.25至4 kHz的测试范围内，压缩后的样本比相同厚度的常规样本吸收的声音要多得多。由压缩样品中的泡沫微结构的转变引起的吸声趋势是初始孔径和孔隙率的函数。提出了将压缩泡沫样品的微观结构特性与常规样品联系起来的分析方法，从而提供了一种通过使用现有模型来估计压缩样品的吸声趋势的方法。