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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.2: Computer Technology; 20050717-21; Denver,CO(US) >INELASTIC ANALYSIS OF DISSIMILAR MATERIAL FLANGES WITH METAL RING GASKETS AT ELEVATED TEMPERATURE
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INELASTIC ANALYSIS OF DISSIMILAR MATERIAL FLANGES WITH METAL RING GASKETS AT ELEVATED TEMPERATURE

机译：高温下金属环垫片异种材料法兰的弹性分析

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摘要

The dissimilar material flange connections are often adopted to connect the austenite stainless steel pipes to the low alloy steel pressure vessels operated at an elevated temperature. The behavior of this flange connection is very complicated because of the non-uniform temperature distribution and the thermal expansion difference of dissimilar materials. The application of the metal ring gasket makes the behavior more complicated. An elastic plastic finite element analysis is one of the adequate ways to investigate the behavior of the following dissimilar material flanges with the metal ring gasket under the high pressure and elevated temperature operation. (1) Pipe flange: standard configuration, austenite stainless steel, (2) Nozzle flange: forged thick nozzle neck, low alloy steel covered with stainless steel overlay. The material of ring gasket is also an austenite stainless steel. This ring gasket contacts to and slips on the ring groove surfaces of flanges. The axi-symmetric analyses were made considering the sequence of initial bolting, internal pressure and non-uniform temperature distribution. The elastic plastic properties and temperature dependency of the materials were considered. From these analyses, the effects of the non-uniform temperature distribution and the thermal expansion difference of dissimilar material flanges on the contact pressure of the ring gaskets were made clear. The effect of flange size (14″-36″) was also investigated.
机译：通常采用异种材料的法兰连接将奥氏体不锈钢管连接到在高温下运行的低合金钢压力容器。由于温度分布不均匀以及不同材料的热膨胀差异，这种法兰连接的行为非常复杂。金属环垫圈的应用使行为更加复杂。弹性塑料有限元分析是研究以下带有金属环垫圈的不同材料法兰在高压和高温操作下的行为的适当方法之一。 （1）管道法兰：标准配置，奥氏体不锈钢，（2）喷嘴法兰：锻造的厚喷嘴颈，低合金钢覆盖有不锈钢覆盖层。环形垫圈的材料也是奥氏体不锈钢。该环形垫圈与法兰的环形凹槽表面接触并在其上滑动。考虑初始锚固，内部压力和温度分布不均匀的顺序进行轴对称分析。考虑了材料的弹性塑性和温度依赖性。从这些分析中，可以清楚地看出温度分布不均匀以及不同材料法兰的热膨胀差异对环形垫圈接触压力的影响。还研究了法兰尺寸（14“ -36”）的影响。

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