another pic is attached. hope everyone understands my problem?https://files.engineering.com/getfile.aspx?folder=9d539afc-7611-4556-b732-98976c048a02&file=IMG_E7300.JPG
swc - plz refer to attached gfx in earlier post, it has most info you need. for sake of discussion, bolt is tension head nas bolt i will provide pic later but for now it is wing stab rib between spars, simple shear tab connection at both ends
swc, idk if the joint is fatigue critical but lowest margin of safety (ms) at this hole is declared bearing critical (static) ms=p,ult/p-1~.31
p,ult=Fbru*dt Fbru=ult bearing allowable of plate 1 d=bolt dia and t=t1 (no reduction is applied due to deep fillet relief/chamfer portion!)
standard shop operations after drilling (1) deburr (2) fillet relief/chamfer on head side of bolt. operator excessively did step 2 so it looks like csk hole. plz refer to attached pic for any clarification.
they went on install the bolt citing the fillet radius region (R=015-025) between bolt...
i built 3d fe model of plate with 1/3 csk 2/3 straight hole, rigid straight pin and define contact elem b/t hole and pin. run static load case, i noticed flat wall region of hole is deformed and radial stress is higher then max brg stress of ~1.27*P/dt (avg is P/dt). no deformation and very low...
in general, bolt hole bearing stress=P/dt, where P=bolt load, d=bolt dia. t=matl thk regardless the hole is straight (protruding head bolt) or csk (countersunk head bolt). what if the hole is excessively chamfer/fillet relief so the result looks almost like csk hole, then what is t if protruding...
