共查询到19条相似文献,搜索用时 62 毫秒
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旋转圆盘应力分析有限元数值模拟 总被引:1,自引:0,他引:1
首先给出了等速旋转圆盘弹性应力分布的理论公式,然后进行有限元数值模拟,详细给出分析模型的建立、载荷和约束条件,给出数值模拟的结果,并对模拟结果与理论结果进行了对比,而且引入一个实际例子进行了上述一系列的分析。 相似文献
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通过对煤层倾角为35°、45°、55°大倾角工作面进行数值模拟,分析了不同煤层倾角开采条件下煤体及围岩的应力分布,探索因煤层倾角变化而引起的应力重新分布规律,为工作面安全生产与支护设计提供了理论依据。 相似文献
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本文建立了青藏公路楚玛尔河路段某冻土路基工程的FLAC 3D数值模拟模型,分析了不同季节的阴阳坡效应和路基内部土体的温度变化规律,研究了温室效应对路基内部土体温度分布的影响规律。研究成果表明:(1)春夏秋冬环境条件下,阳坡和阴坡的温差分别为4℃、0℃、3℃和8℃;(2)在同一水平高度,路基内部土体的温差在夏季相差不明显、春秋季节较为明显、冬季最为明显;(3)温室效应会造成路基内部土体温度整体升高,导致路基土体的冻融交界线每10年会提升约0.6m。 相似文献
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首先采取试验验证的方法证明了高斯热源方案模拟手工电弧焊的准确性。对于石油化工装置中经常出现的复杂构件,以管板角接头为例,利用ANSYS分析软件对焊接残余应力进行建模计算,得到焊接残余应力数值分布。有限元分析结果表明,采用预热与不预热两种不同的焊接参数对模拟结果进行了对比。合理的预热措施使最大径向向焊接残余应力降低20%左右。本文对工程设计公司了解管道焊接过程中焊接接头产生的残余应力及分布引进了一个可行方法。可作为工程设计过程中的参考依据。同时也可用来检验焊接工艺,为现场施工提供建议。 相似文献
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《Journal of the European Ceramic Society》2022,42(4):1743-1749
The effect of water contact on the propagation of microscale surface cracks is investigated in two types of glass: annealed and tempered glass. Initial flaw is artificially created on the glass surface using a Vickers indenter, and is covered with a water droplet for 20 min. Micrographs of the flaw taken before and after water contact confirms the increase in crack length from around 61–103 μm for thermally tempered glass. After water dipping, the maximum length to which the crack growth is approximately 57 % smaller in the thermally tempered glass than in the annealed glass. Despite the severe effect of water contact on crack propagation, it is found that the fracture strength is not substantially altered by water dipping; even though the crack length is enlarged, the fracture strength of glass is similar, and in the case of tempered glass, its fracture strength is slightly changed within 7% due to the blunting of the crack tip by water or others. 相似文献
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目前装配式输油管线与成品油管道对接时,需要使用压力调节阀进行节流、减压来保证装配式管线的安全.为了确定一种新型压力调节阀能否安全可靠地工作,本文采用了数值模拟分析的方法对其进行研究.利用计算流体力学软件对压力调节阀内部流场进行仿真,通过模拟不同开度下的流场情况得到速度、压力分布的可视化图像,并分析得出调节阀的理论流量特性曲线.在此基础上对该调节阀在实验台进行了试验,得到的试验结果与模拟结果误差为11.5%,进一步验证了模拟结果的准确可靠性,得到了该调节阀的流场速度、压力云图及近似快开型的流量特性.研究结果表明:该新型压力调节阀具有比较好的节流、减压能力,能够安全可靠地应用于两种管线对接的工作状况中. 相似文献
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Hongtu He Hongshen Liu Yen-Ting Lin Conghang Qu Jiaxin Yu Seong H. Kim 《Journal of the American Ceramic Society》2021,104(9):4718-4727
Thermal tempering is an industrial process widely used to make soda lime silica (SLS) glass panels stronger and tougher. During the tempering process, the upper and bottom sides of the glass may experience different cooling rates, and thus, their properties could be different. This study characterized changes in surface composition and subsurface glass network structures as well as indentation and wear resistance properties of the air- and tin-sides of 6-mm-thick SLS window panels faced toward the upper and sliding roller sides during thermal tempering. The results showed that although the chemical and structural differences detected with X-ray photoelectron spectroscopy and specular reflection infrared spectroscopy are subtle, there are large differences in nanoindentation behaviors and mechanochemical wear properties of the SLS glass surface. The findings of this study provide further insights into the performance difference between the air- and tin-sides of the SLS glass panel treated with thermal tempering. 相似文献
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The steady state flow in a short-dwell coater has been simulated by solving the two-dimensional Navier-Stokes equations in the primary pressure and velocity variables for substrate Reynolds numbers up to 1000. The small opening under the blade has very little effect on the flow patterns in the coating pond. However, it does have a significant effect on the pressure field in the pond. The pressure on the substrate surface, which controls liquid penetration during application, has a maximum value under the blade, near its tip. Low coating weights and high coating speeds lead to higher maximum pressure on the substrate. The operating pressure which must be applied to the blade can be predicted for a given coating weight and substrate velocity. For high substrate speeds and low coating weights, higher operating pressures are needed to keep the blade in position. 相似文献
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为了预测壳聚糖的玻璃化转变温度,在COMPASS力场和恒温恒压(NPT)系综条件下,利用分子动力学模拟方法,在343~543 K温度范围内研究了壳聚糖的玻璃化转变行为,通过模拟体系在不同温度下的比体积、回转半径和能量参数,获得了壳聚糖的玻璃化转变温度(Tg)。研究结果表明,壳聚糖的比体积、回转半径、内能随温度有规律的变化并在Tg处发生转折。模拟计算得到的壳聚糖的Tg与实验方法获得的值基本相符,分子动力学方法可用于壳聚糖玻璃化转变温度的预测。其中,通过回转半径-温度曲线获得的Tg与实验值最相符,回转半径是影响玻璃化转变的一个重要因素,可用于预测聚合物的玻璃化转变温度。 相似文献
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