francesco87
Aerospace
- Apr 4, 2011
- 9
Hi everybody, this is my first thread.
I'm a beginner with Femap and Nastran, therefore there could be some basics I ignore or I'm not familiar with: I would be very grateful if you gave me some general tips, besides the specific issue in subject.
I'm using Femap v.10.2 with NX Nastran to analyse a PCB assembly (please find attached a picture).
My model consists of a PCB, a chip, some plastic connectors and an aluminium frame, all connected via bolted joints; I modeled everything with solid elements (tetra). I simulated the joints by means of spider curves at the top and the bottom of each hole, connecting their center by a RBE2 element, and I used the "Connect - Automatic" command to detect contacts between surfaces.
Everything seems to work fine but when I run the Normal Modes analysis and animate the modes, all the parts being in contact penetrate each other, whereas with the Linear Static analysis every contact is worked out correctly.
Thanks in advance.
I'm a beginner with Femap and Nastran, therefore there could be some basics I ignore or I'm not familiar with: I would be very grateful if you gave me some general tips, besides the specific issue in subject.
I'm using Femap v.10.2 with NX Nastran to analyse a PCB assembly (please find attached a picture).
My model consists of a PCB, a chip, some plastic connectors and an aluminium frame, all connected via bolted joints; I modeled everything with solid elements (tetra). I simulated the joints by means of spider curves at the top and the bottom of each hole, connecting their center by a RBE2 element, and I used the "Connect - Automatic" command to detect contacts between surfaces.
Everything seems to work fine but when I run the Normal Modes analysis and animate the modes, all the parts being in contact penetrate each other, whereas with the Linear Static analysis every contact is worked out correctly.
Thanks in advance.