铍青铜柱壳膨胀断裂研究

Expanding Fracture of Beryllium Bronze Cylinder Shell

利用高速摄影和金相分析研究了不同热处理状态的铍青铜(QBe2)柱壳在爆轰加载下的膨胀断裂特性。研究表明:材料的细观组织决定材料的静态力学性能与动态断裂性能。当同种材料的组织结构有较大差异时,材料的静态力学性能及动态断裂性能均会有较大改变;当材料的基体组织没有明显变化、只是基体中强化相的多少发生改变时,材料的静态力学性能会有较大差异,而材料的动态断裂性能将没有明显变化,原因在于造成静态力学性能差异的强化相在爆轰加载下的性能趋于一致。

High-speed camera and optical microscope were used to study the expanding fracture characteristic of the beryllium bronze （QBe2） cylinder shell under detonation loading. The experimental result show that the static mechanics characteristics and the dynamic fracture characteristic of the material depend on the material＇s microcosmic structure. When the microcosmic structure of the material has evident difference, the static mechanics characteristics and the dynamic fracture characteristic of the material will be evident changed. When the basic structure of the material have no evident difference while the number of the strengthen phase in the basic structure is changed, the static mechanics characteristics of the material can be evident different, but the dynamic fracture characteristic of the material will be not greatly changed. A reason for such a behavior might be that the strengthen phase which occurs to the difference of the static mechanics characteristics of the material tends to the identical under detonation loading.