曲面PBX构件内部裂纹小角度斜入射超声检测数值模拟  

Numerical Simulation of Small⁃angle Ultrasonic Testing for Inner Cracks in Curved PBX Structure

作　　者：李萌 徐尧[1] 肖盼[1] 张伟斌 李丽[1] 蔡文路[2] 周海强[1] 陈振茂[2] LI Meng;XU Yao;XIAO Pan;ZHANG Wei-bin;LI Li;CAI Wen-lu;ZHOU Hai-qiang;CHEN Zhen-mao(China Academy of Engineering Physics Institute of Chemical Materials,Mianyang 621999,China;Xi'an Jiaotong University State Key for Strength and Vibration of Mechanical Structures,Xi'an 710000,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710000

出　　处：《含能材料》2021年第1期29-34,I0002,共7页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金资助(11702262)。

摘　　要：为探究裂纹分布、形态等复杂性对高聚物黏结炸药(PBX)曲面构件中超声传播特殊性的影响,优化水浸超声斜入射检测参数,基于有限元方法和典型检测工况,建立了曲面PBX构件超声无损检测的数值计算模型,利用COMSOL商用软件计算分析了表面瞬态位移激励下曲面PBX构件内部声场传播规律,模拟计算了不同角度及裂纹的超声检测信号,研究了入射角度等参数对曲面PBX构件裂纹水浸超声小角度斜入射检测结果的影响。数值仿真结果表明,声束与裂纹夹角为8°~10°时,小角度斜入射超声检测方法对PBX构件的内部裂纹缺陷的检测性能最优,且不受裂纹深度的影响。同时,设计制作了曲面PBX模拟试件,搭建了小角度超声检测实验系统,开展了不同入射角度、裂纹参数下的超声检测实验,实验所得最优检测角度(8°)与仿真结果(8°~10°)吻合,验证了数值模拟结果的合理性和小角度超声检测的有效性。In order to explore the influence of the complexity of crack distribution and shape on the particularity of ultrasonic propagation in curved surface components of polymer bonded explosives(PBX),and optimize the parameters of ultrasonic oblique incidence testing,a numerical model of ultrasonic nondestructive testing of curved PBX components was established,based on the finite element method and typical testing conditions.The surface P under the excitation of transient displacement was calculated and analyzed by COMSOL commercial software.The propagation law of the internal sound field of PBX component was simulated,the ultrasonic detection signals of different angles and cracks were calculated,and the influence of the incident angle and other parameters on the detection results of small angle oblique incidence of ultrasonic water immersion crack of curved PBX component was studied.The numerical simulation results show that when the angle between the beam and the crack is 8°~10°,the small angle oblique incidence ultrasonic detection method has the best detection performance for PBX internal crack defects,and is not affected by the crack depth.At the same time,the curved PBX simulation specimen was designed and manufactured,the small angle ultrasonic testing experiment system was built,and the ultrasonic testing experiments under different incident angles and crack parameters were carried out.The optimal testing angle(8°)obtained from the experiment was consistent with the simulation results(8°~10°),which verified the rationality of the numerical simulation results and the effectiveness of small angle ultrasonic testing.

关 键 词：高聚物黏结炸药(PBX) 裂纹 超声斜入射检测 数值模拟 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术]