Journal of Failure Analysis and Prevention

, Volume 16, Issue 4, pp 601–611 | Cite as

Extended Isogeometric Analysis (XIGA) of Fatigue Life in Attachment Lug

  • M. Naderi
  • S. Sarkar
  • M. Amiri
  • N. Iyyer
Technical Article---Peer-Reviewed


In the present paper, extended isogeometric analysis (XIGA) is used to compute the stress intensity factor (SIF) in straight lugs of Aluminum 7075-T6. XIGA uses the non-uniform rational B-spline (NURBS) functions and enrichment functions through the partition of unity. The Heaviside function is enriched to capture jump at the crack faces, while the analytical asymptotic solutions are incorporate with NURBS to perform the crack tip singularity. The XIGA-based SIF of edge-cracked plate and straight attachment lug are compared with analytical solution and extended finite element method capability available in ABAQUS. Also, crack growth and fatigue life of single crack in attachment lug are estimated and then compared with the available experimental data for two different load ratios equal to 0.1 and 0.5. The SIF calculated from XIGA are in reasonable agreement with the available data.


Attachment lugs Stress intensity factor Extended isogeometric analysis Fatigue life 


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Copyright information

© ASM International 2016

Authors and Affiliations

  1. 1.Technical Data Analysis, Inc. (TDA)Falls ChurchUSA

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