Calculation of trajectories and the rate of growth of curvilinear fatigue cracks in isotropic and composite plates

20th Chemnitz Seminar on Materials Engineering - 20. Werkstofftechnisches Kolloquium

Pokhmurska, H.^1 ; Maksymovych, O.^1 ; Dzyubyk, A.^1 ; Dzyubyk, L.^1

National University Lviv Polytechnic, Lviv

79013, Ukraine^1

关键词: Composite plates;    Curvilinear trajectories;    Fatigue cracks;    Fatigue fracture;    Isotropic and anisotropic materials;    Loading process;    Method of singular integral equations;    Step-by-step method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/373/1/012024/pdf
DOI  :  10.1088/1757-899X/373/1/012024

来源: IOP

【 摘 要 】

The methods of calculating the trajectories and the rate of growth of curvilinear fatigue cracks in isotropic and composite plate structure elements during cyclic loading along straight or curvilinear trajectories are developed. For isotropic and anisotropic materials, the methodes are developed on the basis of the force criterion of destruction with the additional application of the fatigue fracture diagrams. To find the change in the shape of the cracks in the loading process, the step-by-step method was used. At each stage, the direction of the growth of all vertices of cracks and the lengths of their arcs was found on the basis of determining the intensity coefficients of stresses by the method of singular integral equations. The results of calculations of the cracks system growth process are presented.