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首页> 外文会议>Symposium on Cellular Metals and Polymers; 20041012-14; Furth(DE) >Tension and Compression behaviour of stainless steel (316L) hollow sphere structures
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Tension and Compression behaviour of stainless steel (316L) hollow sphere structures

机译：不锈钢（316L）空心球结构的拉伸和压缩行为

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Tension and compression tests have been performed on a cellular material, which is made of metallic hollow spheres (hollomet®). The spheres consist of a stainless steel (316L) with 4 and 2 mm diameter, and 60 μm and 40 μm thick walls, respectively. The density of both structures was about 0.34 g/cm~3.which allows simple comparison of mechanical properties. Additionally, foam specimens with dense and porous sintered cell walls were investigated. Compression and tension tests have been carried out on a universal testing machine. Local strain measurements have been performed to document the deformation behaviour on the global scale. This local strain maps enable the visualisation of the deformations in the cells. The maps displayed a localisation of the strains, which is typical for a cellular material. Compression tests have been performed on cubic specimens with an edge length of 35 mm. The measured stress vs. strain curves exhibited a distinctive plateau stress, which is justified in the homogeneity of the cell structure. The plateau stress in compression was about 1.5 MPa. In-situ compression tests have been carried out in a scanning electron microscope (SEM) to investigate the local deformation mechanism on the cell wall level and to compare this process with other foams. Local strain maps have also been computed for these tests to analyse the deformation process on the local scale. Tension tests have been performed on specimens with a cross section of 35 mm x 35 mm and a length of 70 mm. The measured yield strength σ_(0.2) was comparable to the plateau stress σ_(pl) in the compression tests. To explore the fracture characteristic of the hollow sphere structure the development of the fracture in the vicinity of the sintered neck of the spheres has been documented and failure mechanisms were investigated by means of SEM fractography.
机译：已经对由金属空心球（hollomet®）制成的多孔材料进行了拉伸和压缩测试。球体由直径为4毫米和2毫米，壁厚分别为60μm和40μm的不锈钢（316L）组成。两种结构的密度约为0.34 g / cm〜3，这使得可以简单比较机械性能。此外，还研究了具有密集和多孔烧结孔壁的泡沫样品。压缩和拉伸测试已在通用测试机上进行。已经进行了局部应变测量，以记录整体规模的变形行为。此局部应变图使单元中变形的可视化成为可能。这些图显示了菌株的定位，这是细胞材料的典型特征。已对边长为35 mm的立方试样进行了压缩试验。测得的应力与应变曲线表现出独特的平稳应力，这在细胞结构的均匀性中是合理的。压缩时的平台应力约为1.5MPa。已在扫描电子显微镜（SEM）中进行了原位压缩测试，以研究孔壁水平的局部变形机制，并将此过程与其他泡沫进行比较。还为这些测试计算了局部应变图，以分析局部尺度上的变形过程。已经对横截面为35 mm x 35 mm，长度为70 mm的样品进行了拉伸试验。在压缩测试中，测得的屈服强度σ_（0.2）与平台应力σ_（pl）相当。为了探索空心球结构的断裂特性，已记录了球的烧结颈附近断裂的发展，并通过SEM断层扫描研究了破坏机理。

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