Dynamic Tensile Deformation and Fracture of a Polymer-bonded Explosive Using SHPB and High-speed DIC Method
In this work,various tensile tests,including Brazilian disc test(BDT),flattened Brazilian disc(FBD)test and semi-circular bending(SCB)test,were carried out on a polymer-bonded explosive(PBX)by using a split Hopkinson pressure bar(SHPB).With the consideration of low strength and low wave impedance of the materials,a quartz crystal transducer was embedded in SHPB to measure the loading forces.A high-speed camera was used to capture the deformation and fracture process of PBX.Digital image correlation(DIC)method was used to process these digital images to obtain the dynamic deformation information.Based on the measured strain fields,the crack growth path was determined and the failure mechanism of samples was analyzed.Combining SHPB and DIC method,the indirect tensile stress strain plots of disc samples were obtained,and the dynamic fracture toughness of PBX was measured using both FBD and SCB tests.The results show that the tensile failure strength and fracture toughness increases with the increase of strain rates,exhibiting strain rate dependence.The high-speed DIC method combined with SHPB is effective to study the dynamic tensile behaviour of brittle materials with low strengths.
PBX Deformation and Fracture High-speed DIC SHPB Strain Rate
Zhongbin ZHOU
Xian Modern Chemistry Research Institute,Xian 710065,P.R.China;Beijing Institute of Technology,Beijing,100081,P.R.China
国际会议
The 5th International Conference on Mechanical Engineering and Mechanics(第五届国际机械工程与力学会议)
江苏扬州
英文
689-695
2014-08-21（万方平台首次上网日期，不代表论文的发表时间）