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《防务技术》2020,16(1):50-68
The interface defeat phenomenon always occurs when a long-rod projectile impacting on the ceramic target with certain velocity, i.e., the projectile is forced to flow radially on the surface of ceramic plates for a period of time without significant penetration. Interface defeat has a direct effect upon the ballistic performance of the armor piercing projectile, which is studied numerically and theoretically at present. Firstly, by modeling the projectiles and ceramic targets with the SPH (Smoothed Particle Hydrodynamics) particles and Lagrange finite elements, the systematic numerical simulations on interface defeat are performed with the commercial finite element program AUTODYN. Three different responses, i.e., complete interface defeat, dwell and direct penetration, are reproduced in different types of ceramic targets (bare, buffered, radially confined and oblique). Furthermore, by adopting the validated numerical algorithms, constitutive models and the corresponding material parameters, the influences of projectile (material, diameter, nose shape), constitutive models of ceramic (JH-1 and JH-2 models), buffer and cover plate (thickness, constraints, material), as well as the prestress acted on the target (radial and hydrostatic) on the interface defeat (transition velocity and dwell time) are systematically investigated. Finally, based on the energy conservation approach and taking the strain rate effect of ceramic material into account, a modified model for predicting the upper limit of transition velocity is proposed and validated. The present work and derived conclusions can provide helpful reference for the design and optimization of both the long-rod projectile and ceramic armor. 相似文献
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康肃丽 《武警工程学院学报》2010,(6):56-60
通过对4所武警院校共计800名教员和机关干部体能状况进行调查,研究了不同体型干部的体能现状,进行了相应的体能评定,并制订了体能综合评价模型。本研究建议:加强武警院校干部的耐力素质训练,以提高干部体能水平,增强体能,改进生活方式,提高武警院校干部的教研能力。 相似文献
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教师的专业知识是从事教育教学工作的前提条件。新疆的双语教师按民族可以分为汉族双语教师和维族双语教师两种,哪种教师的专业知识水平更高,更适合于实施双语教学?本文主要通过实证研究,并辅以哲学思考,对此问题进行分析,最后得出结论,并提出建议。 相似文献
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本文通过对新疆高校校园文化建设现状进行问卷调查,着重对新疆高校校园文化建设存在的问题进行了思考和分析,并在此基础上提出了相应对策。 相似文献
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张世英 《武警工程学院学报》2014,(4):65-67
高素质人才是部队信息化建设的关键。围绕如何面对信息化条件下提高学员创新能力、培养高素质人才问题,对武警院校电工电子实践教学改革,提出一些有效的做法和措施。 相似文献
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李涛 《中国人民武装警察部队学院学报》2012,28(12)
消防设计的合理性对于航站楼安全运行具有重要意义。目前,国内尚未出台航站楼设计防火规范,因此,航站楼消防设计还处于探索和积累经验的阶段。介绍了航站楼消防设计四个阶段、重要设计难点,结合工程实际问题,对消防设计思路系统化进行了梳理,力图为设计者提供少许帮助。 相似文献
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高松 《中国人民武装警察部队学院学报》2005,21(2):71-73
实验室被誉为院校教学中不可缺少的“三大支柱”之一,是从事实验教学、科学研究、技术开发、学术交流的综合性实体。实验室体系是由实验室的分级类别、组织建制、职能作用、功能行为、隶属关系、管理模式、职责权限等诸多要素组成的多元化、多层次的复杂系统。随着“科技强警”战略的实施,培养具有创新精神和实践能力的新一代高素质现役警官已成为公安现役院校教学改革的中心任务,实验室体系在院校教学体系中的地位和作用越来越突出。 相似文献