基于CT图像序列的围压TATB基PBX冲击损伤特性  

Impact Damage Characteristics of TATB?based Polymer Bonded Explosive Under Confining Pressure Based on the CT Image Sequences

作　　者：刘本德 陈华[1] 张伟斌[1] 张才鑫 刘晨[1] LIU Ben-de;CHEN Hua;ZHANG Wei-bin;ZHANG Cai-xin;LIU Chen(Institute of Chemical Materials,CAEP,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院化工材料研究所,四川绵阳621999

出　　处：《含能材料》2019年第3期196-201,I0003,共7页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金面上面上项目(11572294);国家自然科学基金联合基金(U1330202);国家重大科学仪器设备开发专项(2013YQ03062907)

摘　　要：为研究高聚物黏结炸药(PBX)在冲击载荷作用下损伤特性,以分离式霍普金森压杆(SHPB)对TATB基PBX进行了动态冲击实验,利用X射线显微层析成像(X?ray Micro?computed tomography,X?μCT)进行了损伤观测表征,基于CT图像序列并结合数字图像处理算法,对损伤裂纹进行了提取与三维重构,并提出一种基于CT图像序列的缺陷体积占比的损伤变量评价方法,对不同子弹冲击速度作用下的损伤变量值进行了计算。结果表明,损伤裂纹沿着与端面约为60°方向由两端向中间延展,裂纹整体呈"沙漏"分布特征,且随着子弹冲击速度增加,裂纹延伸方向基本保持不变,由于炸药初始损伤的存在,损伤变量值并不一直增大,而是先减小再增大,后呈急剧增大趋势。To study the damage characteristics of polymer bonded explosive(PBX)under impact load action,the dynamic impact test of TATB-based PBX was carried out with split Hopkins on pressure bar(SHHB)and X-ray micro-computed tomography(X-μCT)was used to observe and characterize the damage.Based on CT image sequences and combined with digital image processing algorithm,the extraction and 3D reconstruction of damaged cracks was performed and a damage variable evaluation method based on the proportion of defect volume in CT image sequences was proposed.The value of damage variables under different impact velocities of bullet was calculated.Results show that the damaged cracks extends from two ends to the middle along the direction of approximately 60°with the end face.The whole crack exhibits a“hourglass”distribution characteristic.With the increase of the bullet impact velocity,the crack extension direction is unchanged.Because of the existence of initial damage,the value of damage variables does not always increase,while first decreases and then increases,and then shows a sharp increase trend.

关 键 词：高聚物粘结炸药(PBX) 冲击损伤 X射线显微层析成像(X-μCT) 损伤变量 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O389[理学—流体力学]