摘要
针对爆炸粉末烧结过程中颗粒间的摩擦效应提出了一种无夹角斜碰撞模型,分析了烧结过程中颗粒间摩擦力随温度的变化规律,借助于LS DYNA有限元程序研究了冲击压力、颗粒大小、材料强度等因素对孔隙闭合时间的影响,给出了颗粒界面温升的表达式。研究结果表明,由摩擦引起的颗粒界面的温升与材料特性、颗粒度、冲击角度、冲击压力等因素有关,随材料的蓄热能力、传热能力和材料强度的增加而减小,并随着材料疏松程度、颗粒直径、冲击压力的增加而增加;在粉末颗粒直径和冲击压力不是太小的情况下,颗粒表面温度将达到材料的熔点。
In this paper, a slanting impaction model of two parallel plates was proposed to research the effect of friction between particles during explosive consolidation of powder.The change tendence of the interface friction of the particles with the change of temperature was analyzed,and influence of shock compression,grain size of powders and intensity of material on the time for the holes compaction was researched by LS-DYNA program.A formula to calculate the temperature rise at interface caused by adiabatic friction is given.The result shows that the temperature rise is related to factors of material's characteristics,size of particles, angle of shock-direction and shock compression and so on.The temperature rise decreases with the increase of ability of heat deposit and transfer,and the intensity of material's.It increases as the porosity of material,size of diameter or shock pressure increases.The temperature at the interface can be higher than melting point of the material if the grain diameter and compact force are appropriate.
出处
《高压物理学报》
CAS
CSCD
北大核心
2004年第2期97-102,共6页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(10172025)
辽宁省自然科学基金
