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炮弹弹底厚度估算半经验公式
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作者 糜晨曦 王雨时 +2 位作者 闻泉 张志彪 王光宇 《弹箭与制导学报》 北大核心 2019年第3期90-96,共7页
针对传统弹底强度计算公式所需参数多、公式形式复杂的问题,提出了形式简单、所需参数少、计算准确度较高的弹底厚度估算半经验公式建立方法。基于传统弹底强度理论,建立传统公式的简化形式,结合最小二乘法原理,拟合得到满足弹丸工程设... 针对传统弹底强度计算公式所需参数多、公式形式复杂的问题,提出了形式简单、所需参数少、计算准确度较高的弹底厚度估算半经验公式建立方法。基于传统弹底强度理论,建立传统公式的简化形式,结合最小二乘法原理,拟合得到满足弹丸工程设计要求的半经验公式。仿真结果表明,传统公式计算的弹丸弹尾区应力分布较为恶劣,而半经验公式计算的弹丸弹尾区应力分布更接近实际弹丸弹尾区应力分布,验证了半经验公式计算结果的准确性优势。 展开更多
关键词 弹底强度 厚度 半经验公式 药工程
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Depinning Dynamics of Fluid Monolayer on a Quenched Substrate
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作者 曹义刚 刘嘉 付根义 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第11期893-896,共4页
Langevin simulations are preformed on the depinning dynamics of fluid monolayer on a quenched substrate. With increase in the strength of the substrate, we find for the first time a crossover from elastic crystal to s... Langevin simulations are preformed on the depinning dynamics of fluid monolayer on a quenched substrate. With increase in the strength of the substrate, we find for the first time a crossover from elastic crystal to smectic flows as well as a crossover from smectic to plastic flows above the depinning. A power-law scaling relationship can be derived between the drift velocity and the driving force for both the elastic crystal and smectic flows, but fails to be obtained for the plastic flow. The power-law exponents are found to be no larger than 1 for the elastic crystal flow and larger than 1 for the smeetic flow. The critical driving force and the averaged intensity of Bragg peaks remain invariant basically in the regime of smectic flow. A sudden increase in the critical driving force is observed within the crossover from the smeetic to plastic flows, and the averaged intensity of Bragg peaks shows sudden decreases within the crossovers both from the elastic crystal to smectic flows and from the smectic to plastic flows. The results are helpful for understanding the slip dynamics of fluids on a molecular level. 展开更多
关键词 FLUID elastic crystal flow smectic flow plastic flow
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