Yes, I hope you can apply the lesson in the bonded contact video to your Mechanical APDL model. I found these videos while searching YouTube for examples of thermally induced stress and passed them on to you because you are a Mechanical APDL user. I didn't actually watch the videos because I have chosen not to learn how to use the Mechanical APDL user interface. I use the Workbench/Mechanical user interface. I created a video to demonstrate how to build your model in Workbench, but you seem committed to using Mechanical APDL like I am committed to using Workbench.
Both user interfaces create APDL code for the solver to read, and to view the results, but there is a big difference in how you interact with the interface to prepare it to write that code or plot a result. In both cases, direct APDL code entry is possible.
The Student Community consists of Discussions, which are on a specific topic, and the topics are grouped into categories. This is a public website, and Google constantly indexes the content, like it does everywhere on the Internet. I have seen some of my posts show up in Google search results.
Most discussions originate because a member has a question. Any other member can read the post and reply. Sometimes I will have a back and forth with one member on a particular problem, and another member is interested in that problem and will have a question or comment. The communication is open for all to read, so that it is a many-to-many discussion. Email is a one-to-one discussion. That is less useful since I may not know something that another member does, but they can't see the email communication and can't contribute.
If the original poster of the discussion feels they have got an answer to their question, then the discussion can be marked "Is Solved" and the topic has a green check mark. That tells other members that the original poster has what they need. Any member can still add a Post to a Solved discussion if they want to add something. If I am looking to help someone, I might skip over Discussions that are marked as Solved. So you could mark this Discussion as "Is Solved" if you have all you need for now. You can start a new Discussion when you have a new question.
There is also the Tutorials section of the Community where members can post information on how to do something that people might find useful. I am going to post the last video over there, so anyone who needs help solving that type of problem can see an example of it. Since these posts are not really questions, the Solved flag is not really relevant.