-1的單軸壓縮實驗，研究了加載過程中整個試樣和局部孔洞的變形失效特征。結(jié)果表明，試樣展示出2種典型的變形模式：壓縮變形模式和連通斷裂模式。壓縮變形模式主要發(fā)生在低孔隙率的試樣，試樣的外表面胞壁出現(xiàn)局部塌陷，而連通斷裂模式易發(fā)生在高孔隙率的試樣中，常在試樣的一個或多個孔層出現(xiàn)連通的斷裂。另外，2種變形模式下的局部孔洞也呈現(xiàn)出不同的形狀變化特征，且在孔洞最小曲率的位置都形成明顯的應(yīng)力集中，相應(yīng)的應(yīng)力集中因子隨試樣孔隙率的增大而增大。微結(jié)構(gòu)分析顯示：剪切帶是試樣失效的主要機制，試樣的斷口容易產(chǎn)生韌窩和韌性條紋。;Regular porous titanium specimens with different porosities was fabricated to investigate the overall and local failure characteristics of porous metals. Dynamic compression tests were implemented using the split Hopkinson pressure bar system at the strain rates from 600 s-1 to 2100 s-1. Results show that the specimens with different porosities exhibit two typical deformation modes: compression deformation mode and connected fracture mode. The compression deformation mode mainly occurs in the specimens with low porosity, and the characteristic is that the cell walls of outer surface of the specimen exhibit local collapse. However, the connected fracture mode mostly occurs in the specimens with high porosity, and usually shows connected fracture in one or more pore layers. Moreover, the local pores of two deformation modes present different characteristics during compression, and the stress concentration occurs at the position with the minimum curvature of the pores. Microstructural analysis indicates that shear band appearing in the intercellular walls is the main failure mechanism of the specimens. Dimples and ductile stripes of fracture surface reveal that the collapse of the intercellular wall is a process of ductile fracture. Meanwhile, the softening failure of the cell walls and the strain hardening of the matrix material can affect the mechanical response of porous titanium. Additionally, with the increase of porosity, the greater the stress concentration factor, the easier the failure of porous metals."/>