PBX代用材料损伤演化原位CT研究  

Damage Evolution Behavior of PBX Substitute Material Using In-situ CT

作　　者：许盼盼 陈华[1] 解社娟[2] 戴斌[1] 刘晨[1] 张才鑫 周海强[1] 陈洪恩[2] 张伟斌[1] 陈振茂[2] XU Pan-pan;CHEN Hua;XIE She-juan;DAI Bin;LIU Chen;ZHANG Cai-xin;ZHOU Hai-qiang;CHEN Hong-en;ZHANG Wei-bin;CHEN Zhen-mao(Institute of Chemical Materials,CAEP,Mianyang 621999,China;State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi′an Jiaotong University,Xi′an 710049,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]西安交通大学机械结构强度与振动国家重点实验室,陕西西安710049

出　　处：《含能材料》2018年第10期888-895,共8页Chinese Journal of Energetic Materials

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

摘　　要：为探究单轴压缩下高聚物黏结炸药(PBX)的损伤演化行为,利用计算机断层扫描(CT)技术对单轴压缩过程中的PBX代用材料进行了原位扫描,获得了不同载荷下试件的原位CT图像。通过分析CT图像的灰度得到了加载过程中试件灰度均值的变化规律,利用数字体积相关(DVC)方法获得了试件内部三维位移场与应变场,结合数字图像相关(DIC)方法与试件表面灰度分析,明确了加载过程中PBX代用材料试件应变变化规律及表面裂纹扩展过程。结果表明,CT图像灰度均值是揭示材料中小于CT分辨率微小损伤变化的重要指标;试件内部应变场及表面灰度变化可以表征加载过程中材料损伤的积累过程。To explore the damage evolution behavior of polymer bonded explosive(PBX)under uniaxial compression,the in-si-tu investigation of PBX substitute material in the uniaxial compression process was carried out by computed tomography(CT).In-situ CT images of the specimen under different loads were obtained.The mean gray value variations of the specimen in load-ing process were obtained through analyzing the gray value of CT images.Internal three-dimensional displacement field and strain field of the specimen were obtained using the digital volume correlation(DVC)method.Combined with the digital image correlation(DIC)method and the gray analysis of the specimen surface,the strain distribution and surface crack growth process of PBX substitute material in loading process were clarified.Results show that at the initial loading stage before the damage oc-curred,the mean gray value of CT image is almost constant.With the increase of load,the micro-damage may occur inside the specimen and the mean gray value of CT image decreases slightly.At the later loading stage,the damage accumulates rapidly and the mean gray value of CT images decreases sharply.The mean gray value of CT image can be considered as an important in-dex to reveal the micro-damage change of material with resolution higher than CT technique,and internal strain field of the speci-men and change of the surface gray value can be used to characterize the accumulation process of material damage during loading.

关 键 词：原位CT 高聚物黏结炸药(PBX)代用材料 损伤演化 数字体积相关(DVC) 数字图像相关(DIC) 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术]