5 Replies Latest reply on Nov 12, 2018 12:22 PM by Samuel Parcon

# How to avoid the stress distribution in static Analysis

Hi Everyone,

I have a model for support structure carrying hot fluid of 5oo Celsius and load of 2000 N of load on the same facets shown in color of green and red Scattered.

The stress Distribution of the model is depicted. Kindly share your valuable suggestions/Feedback.

Immediate reply will be appreciated.

With Regards

Saravanan R

• ###### Re: How to avoid the stress distribution in static Analysis

hard to say, but i'd guess you have a weird BC applied. like maybe do you have a temperature applied to the face?

• ###### Re: How to avoid the stress distribution in static Analysis

Thanks Jared,

I found the same reply. Its due to the temperature applied on the that facets

• ###### Re: How to avoid the stress distribution in static Analysis

Yeah, I have the same question too and it's posted here:

We're you able to find a solution to this issue, or why it is generating speckled stress pattern? I was getting significantly high stresses.

• ###### Re: How to avoid the stress distribution in static Analysis

Hi, so I found the solution for this problem for my situation. The issue was that I was applying temperature to the faces and not the bodies. SW does not have an intuitive way to select bodies because they only have the option to "Select all exposed faces" in the PropertyManager. After I've applied the temperature to the body, the pattern and stresses went away. See my post for more info:

Weird Stress Pattern and High Stress Values - Static Analysis with Thermal load

• ###### Re: How to avoid the stress distribution in static Analysis

Hi Saravanamoorthy,

A temperature applied to one face of a static study will apply that temperature to only that face.  The FEA cannot use null values for the rest of the nodes on the model so a default 0 Kelvin is applied to all other nodes making a large and immediate temperature step function at that face.

For your application, you would want to either run a Flow Simulation analysis on the model with 5 Celsius fluid through that chamber (and natural convection of room temperature on the outside?) so you get a full temperature gradient across the model.  Those temperature results can be fed into the static analysis to account for temperature induced stresses.

Otherwise, you can also use the Thermal FEA study to apply a convection on the inside face that you have selected there with natural convection on the outside again to obtain a similar temperature gradient as the Flow Simulation and once again feed that into the static analysis to find the thermal stresses.  This document (GoEngineer - SOLIDWORKS Simulation: Thermal Stress Analysis) goes over both the Thermal FEA approach and the Flow CFD approach to this.