Tention Coupon testing

Hi ,

I am trying to develop material model for cyclic loading by doing a cyclic loading test on a tention coupon.

It is a strain control test.The strain cycles of 10 cycles are applied at (2%,5%,6%,8%) rate.

The problem is that I want to apply this strain rate to the middle gauge length of tention coupon.

But in abaqus I can apply this load as a displacement load only at one end of tention coupon.

IS there any option is abaqus where I can change the displacement load at one end according to the strain variation in the gauge length

of tention coupon.

Do I have to write a subroutine for doing this?

I don't have experience in writing subroutine , so want to do this in CAE module only.