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The shock responses of submunition drop on various ground-mediums are modeled and investigated by numerical simulation in this paper. Submunition impacts on concrete surface, gravel ground or sand with various drop velocities, different drop angles and attack angles are calculated in a finite element program. The loads and dynamic responses of submunition are analyzed, curves of various drop velocities, drop angles and attack angles related to peak overload are calculated and law of interaction time on different ground mediums is obtained. 相似文献
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Mass loss should be considered while calculating the penetration depth of concrete by eroding long-rod projectiles of high velocity.The penetration process is divided into two phases:eroding phase and rigid phase.During eroding phase,a model to predict the penetration depth is established on the assumption that there is a chipping region in the bottom of crater.During rigid phase,Forrestal formula is adopted to calculate the penetration depth.Using this model,the depth of concrete penetration by a tungsten alloy long-rod projectile is calculated.When the critical eroding velocity is between 950 m/s and 1 000 m/s,the result is in good agreement with the experimental data. 相似文献
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The fragments mass and size from penetrator with enhanced lateral effect (PELE) perforating thin rolled homogenous armor (RHA) target was characterized through theoretical and numerical methods. An analytical model based on energy-limited spall (ELS) was proposed to predict fragments mass distribution of PELE with different cores and impact velocities. For different cores the expansion can be represented by a scaling factor l in the analytical calculation. The explicit finite-element (FE)-analysis of PELE f... 相似文献
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可拓学采用形式化的工具,从定性和定量的共同角度研究和解决现实中的矛盾不相容问题,目前已形成了自己的理论框架,并通过与各工程应用领域的相结合,形成了可拓学工程应用,取得了一定的成果。本文简单介绍了可拓学的发展历史和可拓学基本原理,对可拓学在采矿工程领域中的应用进行了分类,阐述其在解决采矿工程问题的一般方法,指出了应用中存在的一些问题,最后展望了可拓学在采矿工程中的应用前景。 相似文献
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A warhead with axial forward projection fragments is one of the most important forms of aimable warheads. For such warheads the axial forward projection fragments are placed at the end of the explosive charge and form a fragment beam with high fragment density and high speed by the blast, which will obviously increase the damage to the targets. Experimental data showed that the velocities of the forward projection fragments on the convex end of a warhead which was initiated at the opposite end do not match that predicted by the Gurney equation for cylindrical warheads. A new approach for addressing the velocities of fragments of this kind of warhead is proposed. Two limiting conditions are defined, i.e. for fragment on the circumference of a cylindrical charge and fragments on the end of cylindrical charge, respectively. 相似文献
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为研究钨铜复合材料聚能射流成形的细观机理及材料细观结构对射流成形的影响,基于随机投放原理编制了钨铜复合材料细观离散化模型生成程序,建立了不同两相配比及钨颗粒尺寸的钨铜药型罩细观离散化模型。应用动力学仿真AUTODYN-2D软件中的欧拉算法,对钨铜细观模型及其等效均质药型罩开展了聚能射流成形的细观尺度有限元数值模拟分析。研究结果表明,钨铜材料在爆炸载荷驱动下铜相与钨相速度有显著差异,钨颗粒含量沿射流尾部至头部分布不均匀,呈现依次递减的趋势。在一定钨颗粒尺寸下,射流中钨含量相对变化量随着原始药型罩中钨含量降低而增大,钨体积含量30%的钨铜材料形成射流中平均钨含量降低65%,其中头部钨含量下降达90%;在给定罩材两相配比时,射流中钨含量随着钨颗粒尺寸的增大而降低,高钨含量的钨铜射流成分分布不均匀性对颗粒尺寸的变化更加敏感。 相似文献