EFFECT OF CRACK-TIP RADIUS AND CRACK ORIENTATION ON METAL FRACTURE - STATISTICAL PROGNOSIS

Aluminium specimens with pre-caused cracks with different tip radii ar e tensile tested at two temperatures. The cracks are differently orien ted to the tensile axis. The results have undergone statistical proces sing integrated with fundamental fracture approach. Analytical model t o prognosticate the defect metal reliability and the reliability of a randomly chosen detail from a defined set in the range of applied tens ile stresses is found. A method for evaluation of the cracks tip radii and cracks orientation effect on fracture is suggested. The introduce d strength spaces present a principal strength history of defect metal in interval 'load imposing - fracture' at different temperatures.