Investigating Stress Intensity Factor and Fatigue Life Using Extended Isogeometric Analysis Based on Bézier Extraction of NURBS

الموضوعات :

M. M Shoheib ¹ (Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran)
Sh Shahrooi ² (Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran)
M Shishehsaz ³ (Department of Mechanical Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran)
M Hamzehei ⁴ (Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran)

تاريخ الإرسال : 09 الأربعاء , ذو القعدة, 1443 تاريخ التأكيد : 12 الأربعاء , محرم, 1444 تاريخ الإصدار : 05 الخميس , صفر, 1444

الکلمات المفتاحية: Fatigue Life, cyclic load, Bézier extraction operator, XIGA analysis, Stress intensity factor,

ملخص المقالة :

In this paper, the extended isogeometric analysis based on Bézier extraction of NURBS is applied for Investigating stress intensity factor and fatigue life in the two-dimensional crack problems with thermal and mechanical cyclic loading. By transforming NURBS function to linear combination of Bernstein functions defined over C0-continuous Bézier elements, the extended isogeometric analysis can be implemented in the extended finite element method framework. Grid points around the crack line and crack tip are identified by the level set representation. Then, discontinuous enrichment functions are added to the isogeometric analysis approximation. Thus, this method does not require remeshing. The interaction integral method and Paris law has been used to extract stress intensity factor and evaluate fatigue life, respectively. Numerical examples are examined to validate the efficiency of the proposed method. The effect of adaptive refinement strategies on computational cost and convergence is studied. Numerical examples showed that the presented method produces highly accurate results, yet it is beneficial to implement.

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