CAJ | 학술논문

为研究软性材料的HTPB固体火箭推进剂的断裂韧性,采用多试样方法和J积分测试法,综合运用高速显微摄像,跟踪观测了含裂纹拉伸试样的启裂点.采用最小二乘法处理推进剂材料力学性能的离散性,测定了单边穿透裂纹拉伸试样启裂J积分值,该值为1.852 3kJ/m2.试验表明,HTPB固体火箭推进剂裂纹尖端的钝化现象明显,高速显微摄像可以清晰拍摄到钝化和启裂过程.HTPB固体火箭推进剂的断裂参数离散性大,启裂点位置、启裂点载荷和断裂能数值离散,采用最小二乘法进行拟合处理得到了较为合理的临界J积分值.
위연구연성재료적HTPB고체화전추진제적단렬인성,채용다시양방법화J적분측시법,종합운용고속현미섭상,근종관측료함렬문랍신시양적계렬점.채용최소이승법처리추진제재료역학성능적리산성,측정료단변천투렬문랍신시양계렬J적분치,해치위1.852 3kJ/m2.시험표명,HTPB고체화전추진제렬문첨단적둔화현상명현,고속현미섭상가이청석박섭도둔화화계렬과정.HTPB고체화전추진제적단렬삼수리산성대,계렬점위치、계렬점재하화단렬능수치리산,채용최소이승법진행의합처리득도료교위합리적림계J적분치.
To study the fracture toughness of hydroxyl-terminated polybutadience( HTPS) solid rocket propellant of soft material,the multi-sample method and J-testing method were applied to obtain the crack initiation J-integral. The basis of the method and the experimental procedure adopted were described. The crack initiation points of single edge notched tension (SENT) specimens were determined from the video taken by high-speed microscope camera, and the initiation J-integral value was obtained as Jc is 1. 852 3 kJ/m2. The experimental results show that the passivation phenomenon of crack-tip was obvious,and the crack passivation and initiation process can be taken clearly by the high-speed microscope camera. The discrete data of load, displacement value and the fracture energy at crack initiation points were well fitted by use of leastsquares method, and the reasonable critical J-integral value was obtained.