Mathematical model of edge crack development at bending thin-walled Z-shaped profile
Journal Title: Вісник Тернопільського національного технічного університету - Year 2017, Vol 85, Issue 1
Abstract
We consider engineering methods for determining stress intensity factors for defective items open structure bending. Characteristic under development boundary cracks Z-shaped profile. The mathematical model and removed depending to calculate stress intensity factors for the two methods by nominal stress in the net section and by changing the axial cross-sectional moment of inertia Z-shaped profile. Investigated subcritical crack growth boundary, defined stress singularity in the vicinity of fatigue crack – stress intensity factors of the first kind, including models V.V. Panasyuk for pure tensile and bend. Analytical determined correction functions which account for changing the geometry of thin-walled structures with widespread fatigue crack on which the recorded intensity ratios for thin-walled profile elements who perceive tensile strain and pure bending. Graphs correction functions, having their approximation obtained generalized correction function Z-shaped profile 200х87х6 mm dimensions, which simplifies the calculation of residual life of structural elements of the system.
Authors and Affiliations
Taras Dovbush, Mykola Stashkiv, Nadiya Khomyk, Natalia Rubinets
Keywords
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