Deformation with damage and temperature-rise of two types of plastic-bonded explosives under uniaxial compression
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摘要: 通过炸药单轴压缩实验，利用高速摄影和高速红外热像仪，对2种典型PBX炸药变形损伤过程和温升效应进行了实时观测。实验结果表明，2种典型PBX炸药的损伤以及温升效应表现出明显差别：低粘结剂含量的炸药表现出明显的脆性特征，材料应力应变曲线中的应变软化阶段是伴随着材料损伤的演化过程，最终的失稳破坏导致样品中贯穿裂纹的形成，非均匀的裂纹分布对应于局部高温带的出现; 高粘结剂含量的炸药表现出明显的韧性特征，材料应力应变曲线未出现应变软化现象，变形损伤分布较均匀，但剪切方向出现网络状的温升分布。Abstract: In the uniaxial compression, deformation with damage and temperature-rise of two types of plastic-bonded explosives were recorded by means of a high-speed camera and a high-speed infrared radio camera. The results show that the damage evolution and the temperature-rise of the two PBXs are obviously different. As for the PBX with a low content of the binder, the brittleness of the material is characteristically obvious, the strain softening of the stress-strain curve is accompanied with a damage evolution, and the crack formation is due to the failure of the sample, where there existed a local temperature band. As for the PBX with a high content of the binder, the toughness of the material is observed, the strain softening in the stress-strain curve is absent, and the damage is distributed evenly, with a network temperature-rise in the direction of shear.
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Key words:
- solid mechanics /
- damage /
- temperature-rise effect /
- uniaxial compression /
- plastic-bonded explosives
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图 6 不同时刻脆性PBX损伤演化图像
Figure 6. Images of damage evolution of brittle PBX at different time
图 7 脆性PBX炸药的红外温度图像
Figure 7. Infrared thermal images of brittle PBX at different times
图 8 韧性PBX炸药损伤演化图像
Figure 8. Images of damage evolution of tough PBX at different times
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