Excellent post, definitely stick-worthy!
What material did you use for the bolt properties? For Carpenter 158, Im seeing UTS of 160ksi with a yield strength of 135ksi.
Fatigue cycle life decreases rapidly as stress approaches ultimate tensile strength, so that factor of safety of 3 -while good- is not something to interpret as a green light to experiment with more pressure. You might actually need all of that factor of safety to reach design fatigue life.
On the subject of bolt life, I rarely see any discussion of the barrel extension. We go to lengths to lap receivers for bolt alignment and life, but a sloppy/ out of spec barrel extension could introduce its own misalignment. A bolt failure with low round count might call into question the tomato stake it was used with.
What material did you use for the bolt properties? For Carpenter 158, Im seeing UTS of 160ksi with a yield strength of 135ksi.
Fatigue cycle life decreases rapidly as stress approaches ultimate tensile strength, so that factor of safety of 3 -while good- is not something to interpret as a green light to experiment with more pressure. You might actually need all of that factor of safety to reach design fatigue life.
On the subject of bolt life, I rarely see any discussion of the barrel extension. We go to lengths to lap receivers for bolt alignment and life, but a sloppy/ out of spec barrel extension could introduce its own misalignment. A bolt failure with low round count might call into question the tomato stake it was used with.