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丝网防护屏碎片云特性数值模拟研究

DOI: 10.11858/gywlxb.2013.03.012, PP. 391-397

Keywords: 丝网防护屏,连续型防护屏,碎片云,数值仿真

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Abstract:

丝网作为一种颇具潜力的轻质防护屏候选材料,在新型防护结构开发中具有广泛的应用前景。为了掌握丝网防护屏超高速撞击特性,采用数值仿真方法模拟球形弹丸分别撞击连续型防护屏和丝网防护屏,研究相同厚度及面密度的2种防护屏受到弹丸撞击后产生的碎片云形态、质量、速度和动量分布的差异。结果表明,丝网防护屏碎片云随撞击位置不同呈现不同形态,但碎片云前端均存在带状碎片分布区域。在丝网防护屏产生的碎片云中,碎片主要分布于碎片云后端,丝网不能有效地减缓入射弹丸速度,其作用主要为切割弹丸。弹丸撞击2种防护屏后,弹丸破碎形成的碎片云中相同部位呈现不同速度变化规律。丝网防护屏碎片云动量密度峰值均高于相同厚度连续型防护屏碎片云,而相同面密度的2种防护屏碎片云动量密度峰值接近。

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