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由于弯头开孔结构无法按常规设计方法进行开孔补强计算,故对弯头接管开孔区域建立了三维有限元力学分析模型。利用三维实体模型,真实地模拟了特殊结构的形状、载荷分布、边界条件,计算出最接近真实状况的应力分布情况;根据有限元分析结果,按JB4732-1995《钢制压力容器——分析设计标准》进行了应力强度评定,为详细工程设计提供了弯头开孔补强计算方法。 相似文献
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为模拟分析超大型LNG储罐在爆炸冲击作用下的结构力学响应,为超大型储罐抗爆分析提供参考,而进行了爆炸冲击作用下超大型LNG储罐动力学响应研究。基于有限元方法,采用三角冲击爆炸荷载模型,考虑了结构常规荷载情况下,进行了三维有限元数值模拟分析。以某22万方LNG储罐为例进行了爆炸冲击作用动力学计算,得出当爆炸冲击作用下储罐主要部位各时刻结构响应,对比分析了位移和应力响应的滞后性,发现了结构动力学响应沿储罐高度的变化规律。为超大型LNG储罐抗爆设计提供参考。 相似文献
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基于ANSYS的立式容器用支承式支座设计 总被引:1,自引:0,他引:1
以15 m~3低温立式储罐为例,利用有限元分析软件ANSYS对直接选用JB/T 4712中标准支承式支座的低温立式容器的封头局部应力进行分析和校核,校核显示封头局部应力不能满足要求,针对这一现象,重点介绍了一种结构改进型支座,并将其与单纯增加设计尺寸的参数改进型支座进行对比,通过有限元分析结果对比,验证了在设备受力改善和结构优化方面,结构改进型支座效果均优于参数改进型支座;此外,该结构改进型支座还能明显节约成本。该支座在实际使用过程中效果良好。 相似文献
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为研究大型低温储罐网壳结构常用的子午线和三角形两种结构形式的力学性能,针对1万方低温储罐分别采用两种网壳形式进行设计,通过有限元软件建模分析,对双子午线网壳和三角形网壳进行参数化建模,并针对不同的工况及不同长度下网壳的变形和应力情况进行分析计算,可以看出在相同用料长度下三角形网壳的最大应变和应力较大,在不同载荷工况下三角形网壳随着网壳层数增加,由定值载荷(内压、集中载荷、风载及雪载)引起的应变及应力随层数增加而减小,由自重、地震载荷或多种载荷叠加引起的应变及应力随层数增加而先减小后增大,通过对两种网壳结构形式进行力学性能仿真分析,为大型低温储罐网壳结构设计和选型提供依据。 相似文献
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利用ANSYS软件建立蒸发罐的三维有限元模态分析模型,计算蒸发罐的前10阶固有频率,并给出前三阶结构振型图.根据模态分析的结果对蒸发罐结构的设计提出了一些建议,为工程设计提供有实用价值的参考. 相似文献
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利用大型有限元分析软件ANSYS对真空平板玻璃结构进行模态分析,按照真空玻璃国家标准,建立1000mm×1000mm真空平板玻璃模型,在ANSYS中设置材料属性及边界条件进行模态分析,在0~100000Hz频率范围内求解其1~10阶整体结构的固有频率及振型。另外,对相同尺寸下普通玻璃及中空玻璃模型进行模态分析,与真空平板玻璃固有频率及振型加以对比。结果表明:与普通平板玻璃及中空玻璃相比,真空平板玻璃每一阶固有频率最大,并且变形最小。说明真空平板玻璃刚度性能优先于普通玻璃及中空玻璃。为其整体设计及其制造提供了科学的依据,将有效预估结构的振动特性。 相似文献
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Residual thermal stresses prediction for CVD coating/substrate system based on a numerical model 下载免费PDF全文
Yang Wang Zhaofeng Chen Ning Pan Binbin Li Shengjie Yu Sheng Cui 《International Journal of Applied Ceramic Technology》2018,15(6):1397-1406
For a chemical vapor deposition (CVD) coating/substrate system, an improved and optimized numerical model is established to predict the residual thermal stresses. This model takes into account both the normal and bending strains and is developed based on the concept of a misfit strain between coating and substrate. Comparisons are presented between predictions from this model and from finite element analysis. The effects of coating thickness, elastic modulus, temperature difference, and multiple deposition on the residual stresses in the coating/substrate system have also been analyzed in detail. Furthermore, some confirmatory CVD SiC experiments with different layers have also been conducted according to the analysis model. The predictions that the multiple deposition system can relieve the residual thermal stresses and reduce the microcracks in the outermost coating effectively, are consistent with the numerical model. 相似文献
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《Journal of Adhesion Science and Technology》2013,27(8-9):1033-1052
Abstract The cohesive zone model approach is attractive for the analysis of failure of adhesively bonded structures. While the numerical implementation of cohesive elements has been well established, there remains a lack of cohesive material data. The present paper contributes to efforts to fill this void. An investigation of crack growth in the widely used structural adhesive Hysol EA-9394 is presented, and the adhesive is characterized by a cohesive zone law. Crack growth experiments were performed on specimens consisting of aluminum adherends bonded by use of the adhesive. Measurements of the surface topography leading reconstruction of fracture processes indicate that plastic deformation is absent during fracture. Thus, the cohesive zone law can directly be determined from the energy release rate and the material separation measured at the initial crack tip. The cohesive zone law is then applied in finite element model to predict crack growth. The predicted strain fields during crack growth are well matched to those obtained by digital image correlation measurements. An independent set of crack growth experiments was performed, and finite element models based on the cohesive law were used to predict the outcome of these experiments. Again good agreement between simulation and experiment was obtained. The results give confidence that the cohesive zone model parameters are transferable to the analysis of structures bonded with the adhesive Hysol EA-9394 in general. A comparison of the cohesive zone law for Hysol EA-9394 demonstrates that this adhesive possesses high strength and moderate toughness. Limits to the transferability regime are discussed. 相似文献
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采用ANSYS有限元分析软件对含外壁凹坑的压力管道受轴向弯矩时的极限载荷进行了研究,建立了压力管道有限元模型,检验了有限元模型的计算结果。研究结果给出了管道结构塑性区扩展过程,分析了凹坑几何尺寸对管道极限载荷值的影响规律,结果表明,有限元模型计算结果与实测值比较吻合。 相似文献
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对国内外近几年来聚合物基复合材料结构可靠性的研究状况,本文研究了聚合物基复合材料可靠性的理论研究成果和复合材料可靠性优化设计及失效分析等内容.着重介绍了随机有限元法(SFEM),结合研究的成果分析了实际工程中存在的问题,如聚合物基复合材料层合板的优化设计、结构的失效分析等,并对该方向的研究提出了新的建议. 相似文献
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Ben Abdelhamid Manel Sghaier Jalila Mihoubi Daoued Bellagi Ahmed 《Drying Technology》2013,31(2):143-152
This article presents a numerical study for the analysis of the thermo-hydro-mechanical behavior of concrete subjected to high temperatures. Concrete is considered as a multiphase porous medium. The model, describing the strong coupling between mass, heat, and momentum transfers, takes into account the dehydration of the solid skeleton caused by a temperature increase. Simulations of the governing equations are presented in a two-dimensional configuration using the finite element method. Drying kinetics and mechanical behavior of concrete are presented and discussed in terms of moisture content, temperature, gas pressure, porosity, saturation, normal and shear stresses, and volumetric shrinkage evolutions. The model is validated in comparison with numerical and experimental results taken from the literature. 相似文献