Experiment and numerical simulation on expansion deformation and fracture of cylindrical shell
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摘要: 基于一端起爆的柱壳外爆加载装置，采用多普勒速度测量仪(DPS)及高速分幅相机联合诊断柱壳的膨胀断裂过程。实验获得了壳体表面的速度历史和膨胀变形、裂纹萌生扩展到爆轰产物泄露的动态图像。利用光滑粒子流体动力学方法(SPH)开展了对应的数值模拟，计算结果与实验结果吻合较好。实验与数值模拟结果系统地给出了冲击波入射柱壳角、爆轰波稀疏角、内壁速度压力历史及壳体变形应变、壳体断裂等物理信息。Abstract: Relying on the explosively driven setting of one-end detonator initiation and using the Doppler velocimetry and high-speed framing camera, we diagnosed the expansion and fracture process of the cylindrical shell. The results obtained from our experiment provide the velocity-time history of the shell surface and its dynamic snapshots referring to expansion deformation, crack initiation and propagation, and explosion product leakage. The results from the SPH simulation are in reasonably good agreement with the experimental findings. Systemic analysis of experiments and simulations determine incident angle of shock wave for cylindrical shell, releasing angle of explosion wave, velocity and pressure profile of internal wall and deformed strain, fracture process of cylindrical shell.
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Key words:
- solid mechanics /
- fracture /
- DPS /
- SPH /
- cylindrical shell /
- velocity profile
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图 2 壳体表面速度及位移实验与数值模拟比较
Figure 2. Comparison of experimental and numerical comparisons of expansion velocity and displacement
图 3 柱壳内壁和外壁的速度及压力历史
Figure 3. Velocity and pressure histories for inner and outer walls of cylindrical shell
图 5 光学分幅图像记录了壳体表面不同时刻的局域变形、裂纹萌生扩展及产物泄露
Figure 5. Optical framing camera records of local deformation, crack initiation, propagation and
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