I have been working on a cab design for a tractor and have run in to some issues with stress and deflection in the results. I have been getting approximately half or 1/3 of the stress and total deflection then the test we did on cab. I am doubting the connection type, for the welded joints I am using the bonded connection (local bonds, not using global at all) and for cab isolators I have been using elastic support. Not sure what shoul be the right approach. Any help would be appreciated a lot.