INTERACTION ANALYSIS OF NON-ALIGNED CRACKS USING EXTENDED FINITE ELEMENT METHOD

Authors

  • ALI ABBASZADEH BIDOKHTI FACULTY OF MECHANICAL ENGINEERING, K. N. TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN
  • AMIR REZA SHAHANI FACULTY OF MECHANICAL ENGINEERING, K. N. TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN

Keywords:

CRACK INTERACTION, CRACK GROWTH, EXTENDED FINITE ELEMENT METHOD, BRITTLE FRACTURE

Abstract

MULTIPLE FLAWS ARE FREQUENTLY OCCURRED IN ACTUAL COMPONENTS, SUCH AS PRESSURE VESSELS AND POWER PLANTS. THESE FLAWS WILL IN SOME CIRCUMS-TANCES LEAD TO MORE SEVERE EFFECTS THAN SINGLE FLAW ALONE. ASSESSMENT OF THE INTERACTION BEHAVIOR IS BASED ON THE EVALUATION OF ALIGNMENT AND COMBINATION OF THESE MULTIPLE FLAWS. IN THE CURRENT STANDARDS, MULTIPLE CRACKS ARE TREATED AS AN EQUIVALENT SINGLE CRACK IF THE DISTANCE BETWEEN TWO CRACKS SATISFIES A PRESCRIBED CRITERION. FIRST, THIS STUDY INTRODUCES THE CURRENT ALIGNMENT AND COMBINATION RULES FOR THROUGH-WALL CRACKS. FOL-LOWING, TO INVESTIGATE THE EFFECTS OF THE INTERACTION OF CRACKS, BRITTLE FRACTURE OF A PLATE CONTAINING TWO OFFSET CRACKS IS SIMULATED. THE EFFECT OF CRACKS DISTANCES AND CRACK LENGTHS ON STRESS INTENSITY FACTORS IS EVALUATED. IN ADDITION, CRACK GROWTH BEHAVIOR IS SIMULATED BASED ON LINEAR ELASTIC FRACTURE MECHANICS APPROACH. THE EXTENDED FINITE ELEMENT METHOD HAS BEEN UTILIZED TO MODEL THE PROBLEM. THIS METHOD ENABLES THE DOMAIN TO BE MODELED BY FINITE ELEMENTS WITHOUT EXPLICITLY MESHING THE CRACK SURFACES, AND HENCE CRACK PROPAGATION SIMULATIONS CAN BE CARRIED OUT WITHOUT REMESHING. BASED ON THE RESULTS, A NEW ALIGNMENT AND COMBINATION RULE IS PROPOSED.

Author Biographies

ALI ABBASZADEH BIDOKHTI, FACULTY OF MECHANICAL ENGINEERING, K. N. TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN

ALI ABBASZADEH BIDOKHTI IS PRESENTLY A PH.D. CANDIDATE IN THE FACULTY OF MECHANICAL ENGINEERING AT K. N. TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN. HE IS THE MEMBER OF THE FRACTURE MECHANICS RESEARCH LABORATORY AT DEPARTMENT OF APPLIED MECHANICS SINCE UNDER THE SUPERVISION OF PROFESSOR AMIR REZA SHAHANI. HIS SCIENTIFIC INTERESTS INCLUDE FRACTURE MECHANICS, FEM SIMULATION, EXTENDED FINITE ELEMENT METHOD (X-FEM) AND COMPOSITE STRUCTURE. HE HAS PUBLISHED MORE THAN 10 PAPERS IN NATIONAL AND INTERNATIONAL JOURNALS AND CONFERENCES.

AMIR REZA SHAHANI, FACULTY OF MECHANICAL ENGINEERING, K. N. TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN


AMIR REZA SHAHANI IS PRESENTLY A PROFESSOR OF SOLID MECHANICS IN THE FACULTY OF MECHANICAL ENGINEERING AT K. N. TOOSI UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN. HE IS THE HEAD OF THE FRACTURE MECHANICS RESEARCH LABORATORY AT DEPARTMENT OF APPLIED MECHANICS. HIS SCIENTIFIC INTERESTS INCLUDE FRACTURE AND FATIGUE, FEM SIMULATION AND ANALYTICAL MODELLING. HE HAS PUBLISHED MORE THAN 130 PAPERS IN NATIONAL AND INTERNATIONAL JOURNALS AND CONFERENCES.

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Published

2015-08-03

Issue

Vol. 12 No. 13 (2015)

Section

Articles

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