Hi, I am trying to simulate Additive manufacturing process where i need to change the powder conductivity and density during melting and back to solidification. The powder which is loose undergoes melting when high powered moving laser is used to melt them, the conductivity and density of the powder changes once it melts. Therefore, I need to define two different material properties to change the element property after it melts. But whenever i use Emodif command before solving or MPCHG command after finding out the elements that goes above the melting point using Etable in post7, ANSYS crashes everytime on the subsequent solver operation. I am confused as to why ANSYS crashes after using these functions. It is not highlighting the error and even I couldn't find similar issue anywhere on the internet. Please someone can help me on this or if anyone else is also facing the same issue.