Acoustic emissions analysis of damage in amorphous and crystalline metal foams
Acoustic emissions analysis of damage in amorphous and crystalline metal foams
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DOI：
10.1016/j.intermet.2006.01.029
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发表时间：
2006-08-01
期刊：
影响因子：
4.4
通讯作者：
Dunand, D. C.
中科院分区：
文献类型：
--
作者：
Brothers, A. H.;Prine, D. W.;Dunand, D. C.
采用声发射方法研究了由zr基块体金属玻璃制成的韧性非晶和脆性结晶金属泡沫在单轴压缩过程中的微断裂损伤性质和演变，并将其与14种类似结构的铝基泡沫进行了比较。对于非晶泡沫，声活动揭示了泡沫应力平台区从弥漫性损伤到局部损伤的演化过程，并在泡沫致密化区向弥漫性损伤方向逆转。通过周围的韧性支柱调节微断裂，以及显著的点接触形成，允许在非晶泡沫中达到约80%的高平均压缩应变，而不会出现宏观破坏。(c) 2006 Elsevier Ltd.版权所有。
Acoustic emission methods are used to investigate the nature and evolution of microfracture damage during uniaxial compression of ductile amorphous and brittle crystalline metal foams made from a commercial Zr-based bulk metallic glass, and to compare this behavior against that of 14 aluminum-based foam of similar structure. For the amorphous foam, acoustic activity reveals evolution of the damage process from diffuse to localized damage through the foam stress plateau region, and reversion back towards diffuse damage in the foam densification region. Accommodation of microfracture by surrounding ductile struts, and significant point contact formation, permit high average compressive strains of ca. 80% in the amorphous foam without macroscopic failure. (c) 2006 Elsevier Ltd. All rights reserved.