Stress-Strain Field near Crack Tip and Calculation of Critical Stress of Crack Propagation in a Pure Bending Beam of Rectangular Section with One-Sided Mode I Crack

This paper studies the stress-sirain field near crack tip in a pure bending beam of rectangular section with one-sided mode I crack by the analytic method of Ref [1],then it gives the stress and strain components at the crack tip when the crack propagates and further it obtains the formulas of calculating the elastic deformed area width, the deformed intensity, area width and the equation groups of calculating the critical stress of crack propagation, last the equation group of calculating critical stress of crack propagation is verified by calculating instance. The maximum error is 0.18%.