Abaqus UEL: how to acquire the value of solution variables at time t?

[tyzhang]

Dear Community,

I am trying to implement an UEL for implicit dynamics analysis. After applying time-stepping scheme (implicit backward Euler), the formula of RHS vector requires the value of solution variables at time t. However, in UEL only an estimate of solution variables and their derivative w.r.t. time at t+δt are provided as passed in information. How can I get the value of solution variables and their time derivatives at time t? Thanks.