温压时效处理PBX内部裂纹愈合现象研究

Healing of Cracks in PBX by Thermal Pressure Aging Treatment

采用温压时效处理技术开展PBX炸药件裂纹愈合试验,结合微焦点X射线断层扫描技术(μCT)、超声和力学性能测试,对PBX裂纹愈合现象开展探索研究。结果表明:经处理后,400μm以下的内部裂纹愈合,愈合后的PBX抗拉强度和抗压强度接近相同密度下的无损伤试件,起到了有效改善受损炸药件质量的作用。裂纹类损伤存在阀值,低于阀值的裂纹可被填充愈合,而超过阀值的裂纹难愈合。PBX炸药件损伤程度影响愈合效果。

Thermal-pressure aging treatment was used in the study on cracks healing behavior of PBX, combined with μCT, ultrasonic testing method and mechanical properties testing method. Results show that cracks blow 400 μm heales after treated, and its tensile strength and compressive strength are close to those of same density sample without damage while the crack in excess of 400 μm couldn＇t heal. It indicats the treatmeet improves the internal quality of the damaged samples effectively in certain conditions. The width of cracks will affect the healing results.