With the help of FEM numerical simulation method, the performance of cooling towers in terms of stress, displacement and local elastic stability due to aerodynamic loads are examined. 采用有限元计算方法,分析了冷却塔在重现期设计风速作用下内力及变形分布,验算了冷却塔筒体局部弹性稳定性。
Effect of height of second-stage cooling on concrete thermal creep stress 二期冷却高度对混凝土温度徐变应力的影响
Localized heating from the welding process and subsequent rapid cooling induces tensile residual stress and angular distortion of the welded structures near the toe of the T-joint in fillet welds. 型接头附近局部的加热及冷却使被焊结构产生残余应力及角变形。
Very Large Hyperbolic Cooling Towers Indirect Wind-induced Vibration Characteristics and Stress Analysis 超大型间接双曲冷却塔的风振特性及应力分析
CONVECTION HEAT TRANSFER OF CO_2 AT SUPERCRITICAL PRESSURES IN TUBE DURING COOLING Mechanical Stress Analysis of a 600 MW Supercritical Boiler Water Separator Based on the Finite Element Method 冷却条件下管内超临界压力CO2对流换热研究600MW超临界锅炉汽水分离器内压应力有限元分析
The mode of heat capacity manage is different from the mode of traditional real-time cooling about the temperature, stress characteristics in laser medium and laser output characteristic. 热容管理模式造成激光介质与传统的实时主动冷却方式有着不同的温度、应力特性及不同的激光输出特性。
Effect of Water Cooling Method on the Residual Stress Distribution in Girth-Butt Weld Joint 水冷法对管道对接接头残余应力分布的影响
During laser remelting, the additive SiO 2 can not only reduce the cooling stress of the remelted layer in ZrO 2 coating, but also hinder the spreading of cracks. 在激光重熔中,SiO2能降低ZrO2熔化层应力并阻碍裂纹扩展;
It has been find out that cooling rate has great influence on thixotropy in the experiments and as cooling rate getting higher yield stress and equilibrium stress will both be larger. 实验还发现含蜡原油降温速率对其触变性有着重要的影响,降温速率越大,屈服应力和平衡应力越高。
The gelation temperature decreases with cooling rates decreasing and shear stress increasing, while cloud point is independent of the cooling rates and shear stress. 含蜡原油管道胶凝的形成主要受热历史和剪切历史的影响,胶凝温度随冷却速度的减小而降低,随剪切应力的增大而降低,而浊点与冷却速度和剪切应力无关。
This paper analyses the machanism produced by cracking and preventative method from both weld seam crystallization cooling contraction stress and deformation stress and puts forward the solving measures. 从焊缝结晶冷却收缩应力和变形张应力两个方面着重分析了裂纹产生的机理和防止方法,并提出了解决措施。
Investigation on water cooling method for improving stress corrosion resistance of welded pipes 改善焊接圆管抗应力腐蚀性能的水冷法研究
A kinetic method for characterizing the effects of cooling shrinkage stress on Crystallization Behavior of polymers 一种可表征冷却收缩应力对聚合物结晶影响的动力学方法
This paper measured the cooling curve of quenched and tempered heavy forging in temper cooling, and calculated maximum instantaneous elastic stress in cooling below 400 ℃. 测量了调质大锻件高温回火冷却时的表面及心部冷却曲线、室温及低温冲击韧性,并且计算了400℃以后冷却时最大瞬时弹性热应力。
Based on several groups of simulated experiment with quenching thick aluminum alloy plate, the effect of the surface heat transfer coefficient on the cooling velocity and residual stress of the work piece has been studied. 通过对铝厚板淬火的多组模拟实验,研究了表面换热系数对工件冷却速度、内应力演变的影响规律。
The effects of cooling shrinkage stress on the matrix crystallization behavior of the PA66/ POE-g-MAH blend were investigated by means of DSC and a kinetic method for characterizing the effect of cooling shrinkage stress on crystallization of polymer. 采用DSC及一种可表征体系冷却收缩应力对聚合物结晶影响的动力学处理方法,对PA66/POE-g-MAH共混材料的结晶动力学为进行了表征。
The technology of controlled cooling for plastics extrusion is expounded. Transfer heat model of controlled cooling, crystalline model and stress model are established. Application of this technology is analyzed. 阐述了塑料挤出成型中的控制冷却技术,建立了控制冷却的传热模型、结晶模型和应力模型,并对该技术的应用进行了分析。
The cooling stress and its effect on superconductivity in bronze process mf-nb_3sn superconducting wire 青铜法MF-Nb3Sn线中的冷收缩应力及其对超导性能的影响
By using finite element numerical simulation software, rules of effect of different cooling media to temperature field and stress field during quenching of studied material have been analysed and researched, distribution of temperature field and residual stress field during quenching have been obtained. 利用变形-传热耦合有限元数值模拟软件,分析研究了不同冷却介质对研究材料淬冷过程温度场与热应力场的影响规律,获得了淬冷过程中温度场和残余应力场的分布。
The higher the temperature of cooling is, the greater the recovery stress is. 停止加热时的温度越高,冷却过程中的回复应力越大。
When the transient analysis is performed, it can be seen that the higher cooling rate results in higher radial stress in the coatings. 对于瞬态分析而言,涂层内部的应力随着冷却速度的增加而增加。
In this paper, the crystallization behaviors of HDPE/ CaCO 3 blends and their dependence on the interfacial adhesion and CaCO 3 content were investigated with a new kinetic method, by which the effects of cooling shrinkage stress on the crystallization can be characterized. 采用了一种可表征体系冷却收缩应力对聚合物结晶影响的动力学方法,研究了不同冷却速率条件下HDPE/CaCO3增韧体系的基体结晶动力学行为及其与材料界面相粘结性及CaCO3含量之间的关系。
Finite element method was used to calculate residual stress that developed when TiAl intermetallic was bonded to Ti alloy by Ag-based filler metal during cooling from joining temperature. The stress distribution of the joint in different joining temperature was studied. 利用有限元方法,对采用银基钎料钎焊钛合金与TiAl时接头在冷却过程中的应力分布情况进行了分析,并研究了连接温度对应力分布的影响。
Then, the program calculates the chucking appliance appearance cooling temperature field and residual stress field. 然后文中还计算了冷却后夹具表面的温度场与残余应力场的分布。
In most cases, transition layer and the cladding layer after cooling performance of macro-tensile stress. 在大多数情况下,冷却后过渡层和熔覆层宏观上表现为拉应力。
The residual thermal stress is formed phenomenally in the cooling period, however, the plastic and creep strain formed in the heating and holding periods are found to be the real reason, and the cooling rate can hardly affect the final stress. 虽然残余热应力在冷却过程中产生,但造成残余热应力的真正原因是加热、恒温过程形成的塑性应变和蠕变应变,而冷却速度对残余热应力基本无影响。
During preheating, heating, insulation, cooling, the stress distribution is irregular, which is effected by thermal stress 、 tension, the transverse stress distribution of the strip in continuous annealing furnace. 在连续退火炉内预热、加热、保温和冷却等过程中,受热应力及工作张力的影响,带钢张应力横向分布不均。
The finite element analysis ( FEA) results reveal that the cooling holes change the stress distribution in the specimen and cause stress concentration near the holes, which result in the decrease of creep life. 有限元分析结果表明,气膜孔改变了模型中的应力分布,在孔附近产生了高应力,导致模型蠕变寿命降低。
The effect of applied stress on the microstructure of continuous cooling transformation With the increase of stress, Bs points also increased significantly. 外加拉应力对连续冷却相变的影响随着应力的加大,Bs点明显升高。
Increasing the laser power only has little effect on the decrease of the cooling rate and the residual stress. 单纯的靠提高激光功率对于降低冷却速度,减小残余应力,作用不大。