摘要
合理选择输入杆、输出杆长度和合适的应变片贴片位置,以实现拉伸应力波。利用PBX压缩强度远大于拉伸强度的性质,不采用承压环,在反射式霍普金森拉杆(SHTB)上对采用与铝杆端面粘接的PBX动态拉伸样品进行动态拉伸性能测试。结果显示,TATB基炸药的动态拉伸强度,在30 s-1应变率下动态拉伸强度达到了13 MPa,远高于准静态下的拉伸强度7 MPa。采用扫描电镜对样品细微破坏形貌进行了观察,结果表明,由于动静态下裂纹不同发展方式和动态下温升使粘结剂发生了软化,准静态下的拉伸破坏模式和动态下的模式明显不同,准静态下是沿晶断裂和穿晶断裂共存,动态拉伸下属于粘结剂脱粘破坏。
Through designing dynamic tensile sample of PBX,selecting length of input bar and output bar,placing strain gauge in proper position,improving experiment methods based on properties of PBX which compressive strength was greater than tensile strength,it was realized dynamic tensile strength in the reflected split Hopkinson press bar（SHTB）.It showed dynamic tests beared high tensile strength.Dynamic tensile strength of PBX attained 13 MPa in 30 s-1 strain rate while quasi-static tensile strength was only 7 MPa.Through observed by SEM,quasi-static tension failure was different with dynamic tension failure because crack had different expand methods and temperature rise induced binder soften.Destroyed model in quasi-static tension was transcrystalline fracture and intergranular fracture and it was binder debonded in dynamic tension.
出处
《含能材料》
EI
CAS
CSCD
北大核心
2011年第6期684-688,共5页
Chinese Journal of Energetic Materials
基金
中国工程物理研究院面上基金(2008B0203013)
自然科学基金(10832003)
关键词
固体力学
反射式霍普金森拉杆
PBX
动态力学性能
高应变率
solid mechanics
split Hopkinson press bar（SHTB）
PBX
dynamic mechanical property
high strain rate
