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采用钛网层叠烧结的方法制备出规则排列与错孔排列具备不同空间拓扑结构的多孔钛。采用扫描电镜观察多孔钛的微观结构,利用具有双差动位移传感器采集变形的Instron力学试验机测试样品压缩应力-应变曲线。通过压缩应力-应变曲线上弹性阶段中的曲线斜率求得其杨氏模量,以规定非比例压缩强度σ0.2为多孔材料的强度指标。经对比研究发现:2种不同的排列方式形成不同的空间拓扑结构。当方形孔错排时,弹性模量和屈服强度均呈现不同程度的下降,且弹性模量下降的幅度远远大于屈服强度下降的幅度。通过力学解析模型分析可知,挠度屈服和应力集中是力学性能下降的主要因素。
Titanium mesh stack sintering method was used to prepare a regular arrangement and the wrong hole arrangement with different topological structure of porous titanium. The microstructure of porous titanium was observed by scanning electron microscopy. The compressive stress-strain curves of samples were tested by Instron mechanical testing machine with double differential displacement transducer. The Young’s modulus was determined by compressing the slope of the curve in the elastic phase of the stress-strain curve to specify the non-proportional compressive strength σ 0.2 as the strength index of the porous material. The comparative study found that: two different arrangements form a different space topology. When the square holes are misplaced, the elastic modulus and yield strength all show different degrees of decline, and the elastic modulus decreases much more than the yield strength decline. Through analysis of mechanical analysis model shows that deflection yielding and stress concentration is the main factor in the decline of mechanical properties.