基于数字体图像相关法的TATB基PBX材料内部变形测量  

3D Deformation Measurement in TATB Based PBX Based on Digital Volume Correlation Withμ⁃Computed Tomography

作　　者：王延珺 邹翔 潘兵[2] 郭昱辰[1] 刘晨[1] 韩超[1] 吕珂臻[1] WANG Yan-jun;ZOU Xiang;PAN bing;GUO Yu-chen;LIU Chen;HAN Chao;LV Ke-zhen(Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621999,China;Institute of Solid Mechanics,Beihang University,Beijing 100191,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 [2]北京航空航天大学固体力学所,北京100191

出　　处：《含能材料》2022年第12期1272-1281,共10页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(11502251);中国工程物理研究院创新发展基金(CX2019012)。

摘　　要：研究采用μ‑CT对单轴压缩过程中的三氨基三硝基苯(TATB)基高聚物黏结炸药(Polymer Bonded Explosives,PBX)试件进行了原位扫描,获得了不同载荷下试件的三维数字体图像;采用基于反向组合高斯‑牛顿配准算法(Inverse Compositional Gauss‑Newton,IC‑GN)的局部数字体图像(Digital Volume Correlation,DVC)方法分析了试件加载前后的2组数字体图像,获得了试件内部具有亚体素精度的三维位移场和应变场;基于获得的应变场根据胡克定律弹性本构关系,重建试件内部的三维应力场。研究结果表明,基于μ‑CT和DVC结合的内部变形测量技术能够直观地揭示试件内部应变局部化区域的产生,并识别亚体素微裂纹在样品中的位置。In order to accurately understand the mechanical characteristic of 1,3,5‑triamino‑2,4,6‑trinitrobenzene(TATB)‑based polymer bonded explosive(PBX)under compressive loading,an in‑situ measurement technique based on micro X‑ray comput‑ed tomography(μ‑CT)imaging and digital volume correlation(DVC)was proposed.The in‑situ scanning for TATB based PBX sample under uniaxial compression was carried out by usingμ‑CT and the three‑dimensional digital volume images of the sam‑ples under different loading were obtained.Then,two sets of digital volume images obtained before and after loading respective‑ly were analyzed by using local DVC method based on the Inverse Compositional Gauss‑Newton(IC‑GN)algorithm and the three‑dimensional internal displacement and strain fields with sub‑voxel accuracy were obtained.The internal stress fields were fi‑nally rebuilt according to the elastic Hook’s rule.The results show that the generation and development process of the strain lo‑calization zone inside the sample could be directly revealed based on the internal measurement technique combining DVC andμ‑CT.In addition,the Zero‑mean Normalized Cross‑Correlation(ZNCC)coefficients are commonly lower at the microcracks.In practical applications,the location of sub‑voxel microcracks could be identified by the distribution of ZNCC coefficients.

关 键 词：高聚物黏结炸药(PBX) 数字体图像相关法 三维内部变形场测量 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O64[理学—物理化学]