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基于二维颗粒元法的超高速碰撞薄靶数值模拟

Keywords: 超高速碰撞,二维颗粒元法,数值模拟

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Abstract:

传统基于网格数值方法在模拟超高速碰撞时存在着材料大变形引起节点位置异常变化,导致单元畸变严重使计算无法进行;尤其是超高速碰撞中引起的材料断裂、破碎等用传统网格算法很难准确描述.为克服传统网格算法在模拟超高速碰撞时存在的缺陷和不足,用二维颗粒元法模拟直径为5mm球形弹丸以4~7km/s对2mm厚的靶板碰撞.模拟结果表明,该方法克服了计算过程中存在的网格畸变现象,模拟得到的弹丸对薄靶开孔规律和形成碎片云形貌与实验基本吻合,证实了二维颗粒元法可作为新方法模拟超高速碰撞.

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