一种计及应变率效应的新侵彻模型  

A New Penetration Model Considering the Strain Rate Effect

作　　者：吴立朋[1,2] 李永池[2] 罗春涛[2] 

机构地区：[1]清华大学土木工程系,北京100084 [2]中国科学技术大学近代力学系,合肥230026

出　　处：《弹道学报》2009年第3期1-4,10,共5页Journal of Ballistics

基　　金：国家自然科学基金重点项目(10632080);弹道国防科技重点实验室基金项目

摘　　要：为了提出一种反映刚弹侵彻脆性材料主要特征物理实质的新侵彻模型,以土盘模型为基础,引入了靶材的应变率效应,得到了含应变率的浮动锁应变公式.提出了一种新的更能反映实际材料性质的侵彻工程分析模型,并给出了计算流程.通过与实验数据的对比,验证了模型的改进对计算结果的改善.通过理论分析和数值计算相结合的方法研究了各因素对子弹侵彻混凝土靶的影响,结果表明,弹的长径比越大侵彻能力越强,弹的初速越大最大侵彻深度增加得越快;摩擦角越大,最大侵彻深度越小.To obtain a new penetration model which can represent the primary characteristics and physical essence of the penetration of rigid projectiles into brittle materials, the strain rate effect was taken into account based on the soil-disc model. A new formula of the floating lock strain was developed and an engineering analytical model which can reflect the actual properties of materials better than existing models was proposed, and then the calculation procedure was given. The comparison between calculation results and experimental results was presented to verify the improvement of this new model due to the modification. Combining theoretical analysis and numerical calculation, the influence of different factors on the penetration of rigid projectile into concrete target was studied. Experimental results prove that the greater the ratio of length to diameter, the greater the penetration effect, furthermore, the maximum prenetration depth increases swiftly as the muzzle velocity of the bullet increases, and when the friction angle increases, the maximum penetration depth get samller accordingly.

关 键 词：侵彻 土盘模型 应变率 数值计算 

分 类 号：O385[理学—流体力学]