Influence Rule of End Face Friction on Static Compressive Strength of Polymer Bonded Explosive (PBX)

摘要

为研究不同端面摩擦条件下的高聚物粘接炸药(PBX炸药的准静态压缩响应行为，选取一种典型的浇注PBX炸药作为研究对象，在二硫化钼润滑、干摩擦、油脂润滑三种端面摩擦条件下进行了静态压缩试验。利用电子万能材料试验机测定了载荷?位移曲线。基于各向同性弹性理论，运用能量守恒方法初步探讨了端面摩擦机理。结果表明，静态破坏应变与摩擦系数有很大关系；同一种摩擦条件下，具有粘弹特性、材料泊松比大、轴向应变大，小长径比的材料在静态压缩试验中有明显的端面摩擦效应。%To study the quasi?static compression response behavior of polymer bonded explosive (PBX) under different end face friction conditions, a typical casting PBX explosive was selected as the research object, and the quasi?static compression tests were carried out under three kinds of end face friction conditions； molybdenum disulfide lubrication, dry friction, and grease lubrication. The load?displacement curves were measured by using electronic universal material testing machine. Based on the isotropic elastic theory, the friction mechanism of the end face was preliminarily discussed by the energy conservation method. Results show that the static failure strain is closely related to the friction coefficient. Under the same friction conditions, the material with viscoelastic properties, high Poisson′s ratio, great axial strain and small length?diameter ratio has an obvious end face friction effect in the static compression test.