Advanced Methods of Continuum Mechanics for Materials and Structures
Advanced Methods of Continuum Mechanics for Materials and Structures
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材料和结构连续介质力学的先进方法
DOI：
10.1007/978-981-10-0959-4_27
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Anwar A
中科院分区：
文献类型：
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作者：
Anwar A
本章 是一项研究的一部分， 调查方案 并对减压阀（PRV）的密封性进行建模。这里介绍的是：文献综述;高温数值研究，包括考虑微观和宏观效应的金属对金属密封接触面变形;以及表面光洁度的微观测量，以及如何在微米到纳米尺度上进行建模。目前，没有文献综述试图了解静态关闭位置的金属对金属密封接触PRV在达到设定压力点时的泄漏现象。这项工作试图通过借鉴其他研究领域的灵感来做到这一点，例如金属与金属接触和垫片密封。围绕流体通过间隙泄漏的关键主题是：流体流动假设，表面特性及其变形，以及用于量化泄漏的实验技术。对于数值研究，阀的几何形状被简化为一个轴对称的问题，它包括一个简单的几何形状，仅由三个组件组成：一个圆柱形喷嘴，它是在与一个光盘（代表阀座顶部），这是由一个压缩的线性弹簧预加载接触。涡轮盘对由奥氏体不锈钢AISI 316 N（L）型钢制成。在先前的研究中，流体压力渗透（FPP）的宏观-微观相互作用在20 ℃的温度下以迭代手动程序进行。该过程现已实现自动化，并通过APDL脚本实现，该脚本可在宏观尺度上调整弹簧力，以在高温下保持一致的密封。最后，使用Alicona Infinite Focus测量表面形状和波纹度，并将其建模为宏观到纳米尺度的1 / 4对称。很明显，表面形式也需要考虑，这是文献没有关注的。
This chapter is part of a research program to investigate and model the leak tightness of a Pressure Relief Valve (PRV). Presented here is: a literature review; high-temperature numerical study involving the deformation of contact faces for a metal-to-metal seal accounting for micro and macro effects; and also microscopic measurements of surface finishes and how they are modelled over a micro to nanometre scale. Currently, no review of literature exists which attempts to understand the leakage phenomenon of metal-to-metal seal contact PRV for static closed positions as they reach the set pressure point. This work attempts to do just that by drawing on inspiration from other research areas such as metal-to-metal contact and gasket seals. The key topics of interest surrounding the leakage of fluid through a gap are: fluid flow assumptions, surface characteristics and its deformation, and experimental techniques used to quantify leakage. For the numerical study, the valve geometry is simplified to an axisymmetric problem, which comprises a simple geometry consisting of only three components: a cylindrical nozzle, which is in contact with a disc (representing the valve seat on top), which is preloaded by a compressed linear spring. The nozzle-disk pair is made of the austenitic stainless steel AISI type 316N(L) steel. In a previous study, the macro–micro interaction of Fluid Pressure Penetration (FPP) was carried out in an iterative manual procedure at a temperature of 20C. This procedure is now automated and implemented through an APDL script, which adjusts the spring force at a macro scale to maintain a consistent seal at elevated temperatures. Finally, using the Alicona Infinite Focus the surface form and waviness is measured, presented and modelled as 1 / 4 symmetric over a macro to nanometre scale. It is clear the surface form also needs to be accounted for, something which the literature does not focus on.