Published: Jan 1983
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Using a finite-element method and thermal simulation, stress-intensity factors are determined for a uniform array of equal depth radial cracks emanating from the internal boundary of a pressurized, autofrettaged thick-wall cylinder. The computation of the same by methods of load relief and weight function also are examined. The combination of finite elements and weight functions is found very effective and is used in this paper for multiple-radical cracks in a partially autofrettaged tube. Extensive numerical results are presented for a cylinder having an external diameter twice that of the internal diameter. It shows that the autofrettaged tube with two diametrically opposed cracks remains, in general, the weakest configuration. For more than two cracks, the higher the number of cracks is, the smaller the stress-intensity factor will be.
stress-intensity factors, multiple cracks, thick-wall cylinder, quadrilateral isoparametric element, weight function, load relief factor, fracture mechanics
Mathematician, U.S. Army Armament Research and Development Command, Large Caliber Weapon Systems Laboratory, Benet Weapons Laboratory, Watervliet, N.Y.
Applied mathematician, Corporate Research and Development Center, General Electric Co., Schenectady, N.Y.