Strain localization and strain propagation in collapsible solid foams
Strain localization and strain propagation in collapsible solid foams
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DOI：
10.1016/j.msea.2012.12.038
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发表时间：
2013-04
期刊：
影响因子：
6.4
通讯作者：
M. Zaiser;F. Mill;A. Konstantinidis;K. Aifantis
中科院分区：
文献类型：
--
作者：
M. Zaiser;F. Mill;A. Konstantinidis;K. Aifantis
在脆性或延性固体泡沫的压缩过程中，在细胞微观结构的尺度上，变形的特征是细胞的局部崩溃和应变局部化带的发展（“破碎带”或“崩溃带”）。在宏观尺度上，既可以观察到容纳施加的压应变的宏观崩溃带的形成和扩展，也可以观察到具有宏观均匀变形的更弥散的损伤积累。本文采用压缩应变梯度塑性框架研究了具有规则和无序组织的固体泡沫中崩塌带的形核和扩展。结果表明，具有有序微观结构的泡沫在宏观上表现为屈服点后单崩溃带形核扩展的不均匀变形模式。随着无序度的增加，我们发现宏观上的均匀变形行为转变为明显的单调硬化和多个非扩展带的扩散形核。
During compression of brittle or ductile solid foams deformation is, on the scale of the cellular microstructure, characterized by local collapse of cells and the development of strain localization bands (‘crushing bands’ or ‘collapse bands’). On the macroscopic scale, one may either observe the formation and expansion of a macroscopic collapse band which accommodates the imposed compressive strain, or more diffuse accumulation of damage with macroscopically homogeneous deformation. We use a compressive strain gradient plasticity framework to study the nucleation and spreading of collapse bands in solid foams with regular and disordered microstructures. It is demonstrated that foams with ordered microstructure may exhibit a macroscopically inhomogeneous deformation mode which is characterized by a yield point followed by nucleation and spreading of a single collapse band. With increasing disorder we find a transition to macroscopically homogeneous deformation behavior characterized by apparently monotonic hardening and the diffuse nucleation of multiple, non-spreading bands.