Dishing in Diaphragm (Thermal Stress/Creep Analysis) Using Fusion 360

By CAD CENTRAL

 Introduction

Dishing in Diaphragms are caused by high temperature and high stresses, Which causes creep in steel over time.

According to a GE publication, it states that dishing beyond approximately 0.1 inch (25.4mm) causes rotor rubbing which can result in a costly repair.

Creep affects the internal micro-structure of the steel and cannot be removed but can be reduced.
Below is the report from a study undertaken to observe the effect of the gradual increase in the operating temperature and pressure load on the diaphragm.

Diaphragm Geometry

Diameter  3000.00 mm
Width              1500.00 mm
Thickness  142.00 mm

Material Specification  Steel ASTM A36 (study preference)

Boundary Conditions

Load                             9.579MN
Applied Temperature   300°C

Result

Displacement 

Heat Flux


Von Misses Stress

Discussion of Result

To be continued

Popular posts from this blog

Understanding Rotating Regions in SOLIDWORKS Flow Simulation

By
Image
By GSC SOLIDWORKS Flow Simulation offers some great tools for analyzing rotating region problems. There are a lot of capabilities within the tool but, often times, there isn’t a lot of information about these capabilities. This article is meant to be a comprehensive guide to everything related to rotating region problems within SOLIDWORKS Flow Simulation. This will include explaining the different types of rotating region problems as well as the best practices associated with each one of them. There are two main types of rotating regions in Flow Simulation; global and local rotating regions. Both of these types are available for all fluid types; Newtonian and Non-Newtonians fluids. Global Rotating Region The global rotating region assumes you have a model that is completely symmetric about the rotating axis and all the components within the computational domain are rotating at the speed of the rotating reference frame. Due to the fact this type...
Read more