基于单孔洞近似的高纯铝部分层裂实验的数值模拟研究  

Simulation of incipient spallation experiments of high purity aluminum based on a single void growth model

作　　者：王永刚[1] 胡剑东[1] 祁美兰[2] 贺红亮[3] 

机构地区：[1]宁波大学力学与材料研究中心,宁波315211 [2]武汉理工大学理学院,武汉430070 [3]中国工程物理研究院流体物理研究所,绵阳621900

出　　处：《物理学报》2011年第12期387-394,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10876014;11072119);国防基础科学研究计划(批准号:B1520110004);宁波大学王宽诚幸福基金资助的课题~~

摘　　要：基于单孔洞近似,对不同撞击速度下高纯铝的部分层裂实验进行了数值模拟研究,讨论了微孔洞长大对波传播的影响及其在自由面速度波剖面上的表现.通过分析微孔洞周围的应力场变化,认识到实测自由面速度波剖面出现"回跳"特征并不能说明材料发生完全层裂,其直接原因是样品内部微孔洞长大所引起的局部卸载效应.将计算得到的自由面速度波剖面和微孔洞相对体积与实验结果进行了对比分析,发现两者均符合很好,表明采用单孔洞增长来近似描述部分层裂样品中随机损伤发展及其对波传播的影响是可行的.By means of a single void growth model,finite element simulations of incipient spallation experiments of high-purity aluminum under different plate impact velocities are carried out.The relationship between the influence of void growth in the sample on wave propagation and the feature of free surface velocity profile is discussed.By analyzing the change of stress field around the void,the occurrence of pullback signal in free surface velocity profiles is attributed to the local unloading wave effect caused by void growth in the sample,which cannot indicate the whole spallation of materials.Free surface velocity profiles and relative void volumes are simulated for different impact velocities and the simulation results are in good agreement with experimental results,which indicates that the stochastic damage evolution in incipiently spalled sample can be described by a single void growth in cell model.

关 键 词：层裂 孔洞增长 自由面速度波剖面 微孔洞相对体积 

分 类 号：TG146.21[一般工业技术—材料科学与工程]