摘要
为探讨爆炸载荷特征对金属柱壳断裂过程的影响,设计不同厚度药柱填塞的TA2钛合金柱壳进行爆炸实验。金属柱壳爆炸膨胀碎裂后,对回收碎片进行微观破坏分析。结果显示:实心填塞装药时,TA2柱壳近内壁区域产生45°或135°分布的绝热剪切带,裂纹沿剪切带扩展导致剪切型断裂;1.9mm厚空心药柱时,柱壳仍呈剪切断裂模式,但裂纹首先在柱壳厚度中部产生并向内外表面发展;随空心药柱厚度减薄至1.2mm,柱壳厚度中部的损伤带更宽且发生层裂。分析认为,柱壳爆炸膨胀断裂模式及其机制不仅与爆炸压力相关,还与载荷脉宽与柱壳壁厚的比值相关,是一个涉及冲击波沿厚度传播及相互作用多物理破坏机制竞争的过程。
Expansion experiments of TA2 titanium alloy cylindrical shells with different thickness charges were carried out to study the effect of explosive load on fracture process of metal cylindrical shells, and the recovered fragments was microcosmically analyzed. The experimental results show that,when solid charge is used,the adiabatic shear bands distributed at 45° or 135° occur in the inner wall of TA2 cylindrical shell, and the cracks on the inner wall expand along the adiabatic shear bands to cause the fracture of shell;when a 1.9 mm-thick cavity charge is exploded, the cylindrical shell still exhibits a shear fracture mode, but the cracks are first generated in the center of the cross-section of cylindrical shell and extend to the inner and outer surfaces. As the thickness of cavity charge is decreased to 1.2 mm, the damage zone in the center of the cross-section of cylindrical shell is wider and the spallation occurs. The analysis shows that the fracture mode and mechanism of cylindrical shell are related to the explosion pressure and the ratio of load pulse width to wall thickness, which is a process involving the propagation of shock wave along the thickness and the competition of multiple physical failure mechanisms.
作者
禹富有
董新龙
俞鑫炉
付应乾
YU Fuyou;DONG Xinlong;YU Xinlu;FU Yingqian(Key Laboratory of Impact and Safety Engineeringof Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China;School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2019年第7期1418-1424,共7页
Acta Armamentarii
基金
国家自然科学基金项目(11672143)
关键词
装药
金属柱壳
爆炸载荷
碎裂
charge
metal cylinder
blast load
fracture
