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Analyzing Bolt Hole Stress

Question asked by Nathan Cassou on Jan 17, 2014
Latest reply on Jan 21, 2014 by Mike Pogue

On the attached assembly I have performed a static analysis on several bolt holes of a flange. The load is coming off of the beam structure putting stress on the flange bolts as shown. For the flange bolts I used a split line round profile over each hole and added a simple static fixture to each face of the split lines to simulate the bolt head diameter. All other connections use the Bolt Connection feature. The material is Al 6061-T6: Yield = 40 ksi, Shear = 37.7 x 10^5 psi. The green plot shows a stress of around 8000 psi while the blue stress plot shows a range of 1600-4000 psi. These bolts are going into concrete anchors which from what I've found can only hold about 4000 psi "pull-out" load. How should I go about analyzing this?