薄壁金属球壳及其组元压缩大变形研究

LARGE DEFORMATION STUDY OF THIN-WALL METAL SPHERICAL SHELL AND ITS COMPONENTS UNDER COMPRESSION

对薄壁金属球壳及组元模型(SC(square cumulation)、HC(hexagonal cumulation)和FC(face-centered cumulation)三种组元模型)进行大变形压缩研究,分别得出各自的压缩力学性能:单个球壳受单轴压缩其名义应力应变关系初始为线性,然后会出现两次局部屈曲,在变形过大时会发生非轴对称变形;SC、HC和FC三种组元模型压缩名义应力、应变关系初始也呈线性,然后趋于平缓,其中SC和HC组元发生了非对称变形,而FC组元发生了对称变形;得出各自的名义弹性模量和屈服极限。以上内容对空心球基多胞材料的研究和应用具有参考意义。

Large deformation of thin-wall metal spherical shell and its components under compression were studied to investigate compressed mechanical properties of each models： When single spherical shell was compressed, its nominal stressstrain curve showed linear condition first, afterwards two topo-unstabilities appeared. Non-axisymmetrical deformation appeared when deformation was large enough. Three component models （ SC （ square cumulation） , HC （ hexagonal cumulation） and FC （face-centered cumulation） ） were compressed. Their nominal stress-strain curve showed linear condition first, afterwards tended to gentle. SC and HC component models showed non-symmetry deformation, and FC component model showed symmetry deformation. The nominal elastic modulus and yield stress were investigated. Above experimental and numerical findings may provide a reference for study and application of this kind of cellular material.