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211.
《防务技术》2014,10(2):154-160
The fracture behavior of polymer-bonded explosive (PBX) seriously affects the safety and reliability of weapon system. The effects of interface debonding and initial meso-damage on the fracture behavior of PBX under quasi-static tension are studied using numerical method. A two-dimensional representative volume element (RVE) is established based on Voronoi model in which the component contents could be regulated and the particles are randomly distributed. A nonlinear damage model of polymer matrix relative to matrix depth between particles is constructed. The results show that the simulated strain-stress relation is coincident with experiment data. It is found that interface debonding leads to the nucleation and propagation of meso-cracks, and a main crack approximately perpendicular to the loading direction is generated finally. The interface debonding tends to occur in the interface perpendicular to the loading direction. There seems to be a phenomenon that strain softening and hardening alternatively appear around peak stress of stress and strain curve. It is shown that the initial damages of intragranular and interfacial cracks both decrease the modulus and failure stress, and the main crack tends to propagate toward the initial meso-cracks. 相似文献
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在建立高斯型连续激光辐照半导体材料InSb物理模型的基础上,采用解析解的形式计算了圆柱形InSb靶板的三维温度场。通过数值分析得出了在连续激光辐照时,InSb发生的是熔融损伤的结果,并计算出相应的损伤阈值。对理论计算与实验结论进行了比较,验证了理论模型的合理性。 相似文献
214.
古代《孙子兵法》要求为将之道必须具备“智”、“信”、“仁”、“勇”、“严”五德要素。新时期部队指挥员应当借鉴历史经验,努力提高自身素质修养,大力培育部队优良战斗作风,为履行新使命、新职责打下坚实基础。 相似文献
215.
为探索有效实用的结构损伤检测方法,运用分形理论直接对结构振动信号进行关联维数分析,通过度量系统输出的奇异性来识别结构的局部损伤,提出了基于振动响应关联维数的结构损伤检测方法.简支梁损伤算例结果表明,该方法能够准确地检测出梁式结构单个和多个不同程度的损伤位置,同时关联维数指标变化值会随着损伤程度的增加而增大.与曲率模态指... 相似文献
216.
初步研究了反导作战指控系统对于TBM毁伤效果评估的过程和依据。以动能杀伤器(KKV)为研究对象,首先分析了KKV脱靶量和杀伤模型,在此基础上,对反导指控系统对TBM的毁伤准则和毁伤效果评估进行了研究并给出了一般TBM毁伤判断流程,最后举例以KKV导引头作用距离和噪声对脱靶量的影响分析研究了达到直接碰撞杀伤的条件。 相似文献
217.
Avinash Paliwal 《战略研究杂志》2017,40(1-2):35-67
India’s Afghanistan policy in the 1990s is termed a zero-sum game of influence with Pakistan. New Delhi’s aversion to the pro-Pakistan Taliban regime is considered a marker of this rivalry. This paper revisits India’s approach towards Afghanistan and examines if New Delhi was necessarily averse to engaging with pro-Pakistan political factions during 1990s. Based on fresh primary interviews with former Indian policymakers, media archives, and official reports, the paper shows that India engaged with and accommodated pro-Pakistan factions after the Soviet withdrawal in 1989 until 1996. The Taliban’s rise to power in Kabul in September 1996 challenged India’s engage-with-all approach. Nonetheless, the decision to sever ties with the Taliban and to bolster anti-Taliban factions was highly debated in New Delhi. Many in India saw the Taliban as a militant Islamist force sponsored by Pakistan. For others, however, it was an ethno-nationalist movement representing Pashtun interests, and not necessarily under Islamabad’s control. 相似文献
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Jack S. Levy 《战略研究杂志》2017,40(5):731-769
If a declining state has incentives for preventive war, the rising state should have incentives to delay a confrontation until it is stronger. We develop the theoretical paradox and examine the July 1914 crisis. Why did Russia, rising relative to Germany, not adopt a buying-time strategy? We argue that although most Russian leaders hoped to avoid a confrontation, they feared that the failure to support Serbia would lead to a loss of Russian credibility and a significant setback to Russia’s position in the Balkans, one that could not easily be reversed, even with Russia’s expected increase in relative military power. 相似文献
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