Aluminum alloy foams, as an important class of cellular materials, have good mechanical and physical properties, such as crash energy absorption, sound absorption, and vibration damping structures.¹ In practical engineering applications, especially when the aluminum foam is used to fill hollow structures, its deformation occurs under constrained stress conditions. These hollow structures will act as a barrier for unconstrained transversal displacements. The description of compressive response of the aluminum foams under constraint loading conditions is essential for designing new foam-filled components.^2,3 Some studies of compressive mechanical properties of lateral and radial constrained closed-cell aluminum foams have been carried out.^4–7 The uniaxial quasi-static and dynamic compression tests under free radial boundaries for the aluminum alloy foams have been studied.^8–11 Nonetheless, for the open-cell aluminum foams, there is limited information available about the compressive response and energy absorption with constrained transversal boundaries.¹² To close this research gap, the compressive tests of unconstrained and constrained open-cell aluminum foams were conducted and the compressive behavior and energy absorption were discussed.

中文翻译：

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无约束和受约束的开孔铝泡沫的压缩行为和能量吸收能力

铝合金泡沫作为一类重要的多孔材料，具有良好的机械和物理性能，例如碰撞能量吸收，声音吸收和减振结构。¹在实际工程应用中，尤其是当泡沫铝用于填充中空结构时，其变形会在受约束的应力条件下发生。这些空心结构将成为无限制横向位移的屏障。在设计约束载荷条件下，泡沫铝的压缩响应的描述对于设计新型泡沫填充组件至关重要。^2,3已对侧向和径向约束的闭孔铝泡沫的压缩机械性能进行了一些研究。^4–7研究了铝合金泡沫在径向自由边界下的单轴准静态和动态压缩试验。^8–11尽管如此，对于开孔铝泡沫，关于有限的横向边界的压缩响应和能量吸收的信息有限。¹²为了弥补这一研究空白，进行了无约束和受约束的开孔铝泡沫的压缩试验，并讨论了其压缩行为和能量吸收。