USDFLD to define FIELD(1) for cumulative temperature

Hello,

 

I want to use USDFLD to define FIELD(1).

 

In my model, elastic modulus is Temperature dependent value. (in static transient heat analysis)

 

However, it is depending on not a simple current temperature but cumulative temperature value over the time.

 

(Elastic modulus is changed depending on the cumulative temperature value (5+10+15....)

 

If cumulative temperature value is large, Elastic modulus become large.

 

If not, elastic modulus is small.

 

I assumed I need to use USDFLD subroutine for solving this problem. (if not please correct me)

 

If yes, please provide me any example or idea for solving this problem.

 

(At this moment, I can define FIELD (1) in USDFLD depending on current temperature value (temp. at previous increment), however, I am not sure how to define FILED (1) depending on the cumulative temperature over time.

 

Your helps would be greatly appreciated.

 

Thank you in advance

 

J. Lee