不同W含量Al/W活性材料的冲击压缩特性  

Impact Compression Characteristics of Al/W Active Materials with Different W Additions

作　　者：宋超慧 任会兰[1] 李尉[1] 郝莉 SONG Chaohui;REN Huilan;LI Wei;HAO Li(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;School of Science,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

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 [2]北京建筑大学理学院,北京100044

出　　处：《高压物理学报》2021年第6期123-131,共9页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11872124)。

摘　　要：采用模压烧结工艺制备不同W含量的Al/W活性材料,基于分离式霍普金森压杆(SHPB)技术,采用紫铜片和橡胶片进行波形整形,研究不同配比Al/W材料的动态压缩和破坏特性。实验结果表明:随着W含量增多,Al/W材料内部的孔洞、微裂纹逐渐增多;W含量不同,Al/W材料的动态压缩变形和破坏特性呈现明显的差异;W的质量分数为44%和64%时,不同应变率下Al/W的应力-应变曲线呈现出弹性-塑性强化的变形特点,破坏应变随应变率增加而增大;W的质量分数为83%的Al/W材料则表现为塑性阶段的应变软化特点;当W的质量分数达到91%时,Al/W材料达到破坏强度后便迅速失效,破坏应变保持在0.03左右。W含量增加时,Al/W变形模式的转化是增强相W和材料内缺陷相互竞争的结果。In this paper,Al/W active materials with different W additions were prepared by molding and sintering processes.Based on the split Hopkinson pressure bar(SHPB)technology,copper sheets and rubber sheets were used for wave shaping,and dynamic compression and destruction characteristics of Al/W materials with different ratios were evaluated.The experimental results showed that with the increase of W additions,the pores and microcracks inside the Al/W material gradually increased.With different W additions,the dynamic compression deformation and failure characteristics of the Al/W material exhibited obvious differences.When the mass fractions of W are 44%and 64%,the stress-strain curves of Al/W under different strain rates exhibited elastic-plastic strengthening deformation characteristics,and the failure strain increased with the increase of strain rate.Al/W materials with a W mass fraction of 83%exhibited the strain softening characteristic in the plastic deformation stage.When the W mass fraction reached 91%,the Al/W material failed quickly after reaching the breaking strength,and the breaking strain is maintained at about 0.03.With the increase of W additions,the transformation of Al/W deformation mode is the result of the interaction between the reinforcing phase W and the internal defects of the material.

关 键 词：Al/W活性材料 波形整形技术 动态压缩强度 

分 类 号：O347.3[理学—固体力学] TB333[理学—力学]