Hi:
I am doing a thermal and stress analysis for laser deposition using commercial software. My thermal analysis has convection, conduction, and radiation and no contact and gives temperature as output for the analysis. I use the temperature as load for my stress analysis where the mechanical...
We have available a large volume of cured rubber shavings and clippings as a result of our manufacturing process. We were wondering if there is perhaps a twin screw type extruder that could mulch this rubber and perhaps have a low pressure chamber extension so that the end result is lower...
Our company makes rubber mats. Recently we were approached by a company that claims to make pellets of devulcanized rubber from scrap tire rubber. We were able to get the product to calendar and cure in some of our trial runs but would like to test their claim to understand the constituents and...
We have an open celled - fibrous PU foam product that we would like to stiffen by using a spray coat/ dip coat or some such process. We envision using this final product for structural applications by perhaps overlaying a stiff pad or grid post coating. Any ideas on what we should be looking at...
Dear All:
I tried to run a sequential thermal and stress analysis by element activation technique. I have no issues running my thermal model but have trouble in mechanical model. When I run my mechanical model, the first element-set that gets activated has no convergence problem but when I...
Hi:
I have been trying to simulate residual stress in my mechanical model for laser scanning by importing the thermal data from Heat transfer model into the mechanical model. I have used commmercial FEA codes. My inital model is at 300K and on applying laser heat flux on the activated set of...
Hi:
I am trying to model residual stress as a result of temperature change using linear isotropic hardening equation.
1. I used USDFLD to calculate young's modulus (as FIELD(1)), poisson ratio (as FIELD(2)) as a function of temperature
2. I calculated the corresponding yield stress (FIELD(3))...
Hi:
I am trying to study phase transformations in LENS process (laser deposition). I have used HETVAL subroutine and it works fine and calculates phase fractions. But the flux(1)=internal heat generated = conductivity matrix+specific heat matrix.
Q = [k]T*+[c]T (HETVAL...
Hi:
I have been having some conduction issues in my simulation. I have a part with solid-1 extruded, and another solid-2 extrude on the top of the former. I partitioned the two solids by cutting plane and partitioned the solid-2 into two cells using cutting plane. I have not applied any...
Hi:
I understand that HETVAL and USDFLD can be used to study phase transformations. Can someone explain some terms which I am unable to understand:
1. like how to update STATEV in HETVAL suboutine (what does STAEV mean?)
2. In USDFLD can say STATEV(1) =Austenite, when Temp(1)g.e. 750, makes...
Hi:
I have tried to do what you said to set the initial conditions of the nodes and deactivate and activate. It works, but the problem is in the vizualization module at the interface between the activated element set and the substrate which is at room temp (created a single part and...
Hi:
I have been trying to simulate laser deposition and created a solid part (extrude-1) and extruded another solid from the same part. I partitioned the extrude-2 and created cells. I used model change to activated deactivate cells, and gave ICs 2000K to deposit and 300 K substrate. Meshed the...
Hi:
I would like to know how to set initial temperature of new activated element each time in heat transfer analysis when it is carried out in multiple steps. (If the type of element used is DC3D20). I have tried to use *temperature in step modules when the new element is activated, but gave...
I am trying to simulate LENS deposition process. But to start with simple I have been running a Heat transfer analysis where I have one deposit block which I removed in step-1 and added in step-2 and I am encountering a cold sink problem in the activated deposit block, although analysis...
