EFFECT OF CHAMFERED HOLES ON THE RESISTANCE OF BOLTS AND DOWELS TO SHOCK LOADS IN SHEAR
Abstract
Under dynamic loading conditions associated with shock motions, hold-down bolts may be subjected to both shear and tensile stresses. If the bolt holes in the shear plane are chamfered so as to permit the bolt to deform in shear and bending along its length, the amount of energy absorbed by the bolt before fracture is increased when shear motions are encountered. The amount of energy absorbed when a 45-degree chamfer was employed was a constant (the energy absorbed by a bolt in shear with no chamfer) plus a term directly proportional to the length of the chamfer. The maximum load developed is about the same for all chamfer sizes in a given material, but this load will be maintained for greater number of shocks for the larger chamfer sizes. The chamfer caused some decrease in stiffness of the joint for shear motions. For relatively large chamfer sizes, or for relatively non-ductile materials, bolt failure resulting from shear motions may be prematurely caused by tensile stresses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 09, 1962
- Accession Number
- AD0282104
Entities
People
- E. R. Seibert
- H. M. Forkois
- I. Vigness
Organizations
- United States Naval Research Laboratory