应变率和孔隙率对规则多孔钛压缩力学性能的影响  

Effects of Strain Rate and Porosity on the Compressive Behavior of Porous Titanium with Regular Pores

作　　者：王婧[1] 任会兰[1] 申海艇 宁建国[1] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《高压物理学报》2017年第4期364-372,共9页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11572049)

摘　　要：采用普通材料测试机和分离式霍普金森压杆(SHPB)实验装置对孔隙规则排布的多孔钛试样进行准静态及动态单轴压缩实验,研究了应变率和孔隙率对多孔钛材料弹性模量、屈服强度和能量吸收能力的影响。结果表明:在不同应变率下,规则多孔钛应力-应变曲线在特定区域均可近似为双线性模型;孔隙率对弹性模量、屈服强度和能量吸收能力有直接影响,屈服强度和能量吸收能力均与应变率相关,并给出了同时考虑孔隙率和应变率对屈服强度影响的经验公式。Using a material testing machine and the split Hopkinson pressure bar （SHPB） system,we investigated the quasi-static and dynamic compressive behaviors of porous titanium with regular pores, and studied the effects of the strain rate and porosity on the Young＇s modulus,yield strength and energy absorption of the porous titanium. The experimental results show that the stress-strain curves of the porous titanium can be approximately described by a bi-liner model in a specific range, and the porosity directly affects the Young＇s modulus,while the yield strength and energy absorption of the porous titanium vary with the stain rate. An empirical relation of the yield strength of the porous titanium was developed using these findings.

关 键 词：多孔钛 应变率 孔隙率 杨氏模量 屈服强度 能量吸收 

分 类 号：O347[理学—固体力学] TB34[理学—力学]