Abstract
We propose the design of a specimen for the investigation of the fatigue fracture of steels under trans- verse shear. A formula for the determination of the stress intensity factor with regard for the friction of crack lips is obtained with the use of the finite-element method. The methods aimed at the construction of the kinetic diagrams of fatigue fracture under the conditions of transverse shear are developed and tested on specimens of 65G structural steel. We plot the kinetic diagram of fatigue fracture and approx- imate its middle segment by a linear dependence in the established parameters. The life of structural elements with sharp concentrators operating the under conditions of shear stresses should be evaluated on the basis of the approaches of fatigue fracture mechanics under the conditions of trans- verse shear. This is why it is necessary to develop methodical recommendations for the reliable determination of the characteristics of cyclic crack resistance (CCCR) of the materials in transverse shear. In the case of mode I fatigue fracture of metallic materials, the methods aimed at the determination of the CCCR were standardized in (1). Some experimental investigations of the mode II fatigue fracture of steels based on the models neglecting the stage of stable growth of fatigue cracks or the friction of their lips are also known (2-5). This negatively affects the analysis of the stress-strain state (SSS) near the crack tip, the determi- nation of the CCCR of materials, and the evaluation of the service life of structural elements as a whole, which should be taken into account in the development of new methods for the construction of the kinetic diagram of fatigue fracture (KDFF) in transverse shear. The aim of the present work is to develop new methods for the construction of the KDFF and evaluation of the CCCR of steels in transverse shear with regard for the friction of crack lips.
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