Stress_Eng
Aerospace
- Jun 15, 2019
- 216
This is the first time I’ve posted a question on this website. Out of personal interest, I’ve generated an analysis template that calculates lug stresses for an axially loaded pin in a lug and clevis joint, both of which have parallel sides with a radius (not square ended). I want to compare the template results to those obtained from a finite element analysis. I’m using PrePoMax to construct and run the FE model and FreeCad to generate the model. The models constructed are for Aluminum Alloy lugs and clevis joints with steel and titanium pins, at pin diameter to lug width ratios of 0.25, 0.50 and 0.75. My question is, what are the pressure over-closure values (surface spring stiffness) considered appropriate for the combination of materials being used? In some instances, the lug wall thickness may be considered relevant [(lug width – hole diameter)/2]. In situations where a small hole diameter is used (d/W = 0.25), would the full wall thickness be relevant? Any suggestions would be much appreciated.