How to Simulate a Screwdriver Driving a Nut Downward and Rotating into a Screw Hole in COMSOL

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Hello everyone, I am currently using the Solid Mechanics physics interface in COMSOL to simulate the process of a screwdriver tightening a nut into a screw hole. My goal is to model the combined downward and rotational motion, where the screwdriver drives the nut to rotate and thread into the hole. In my research, I have been using both transient and steady-state studies, but I have encountered some issues with the setup and would like to seek your advice. I have configured a synthesized load with parameters for both downward force (F) and rotational moment (M) to simulate the screwdriver pressing down while rotating. Additionally, I have defined contact surfaces between the screwdriver bit and the nut. However, in my simulation, the screwdriver only moves downward along the Z-axis and does not perform the expected rotational movement that would drive the nut into the screw hole. Here are my specific questions: 1. What are the detailed steps required to ensure the screwdriver can apply downward pressure and rotate the nut so it threads into the hole? Are there any key setup steps to pay special attention to? 2. Does the contact surface require specific friction or boundary condition settings to allow the screwdriver to effectively rotate the nut when force is applied? 3. Are there any recommended settings or best practices for simulating this type of combined motion, particularly when using both transient and steady-state study modes? Thank you for your time and suggestions! I hope to find a setup that can achieve a more realistic tightening effect.


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