Practical applications of numerical procedures for structural integrity assessment

• Type: Article in International Conference Proceedings Book
• Date: 2015

Authors

S.D. Pastrama (Author) Other; P.M.G.P. Moreira (Author) Other; Paulo Tavares de Castro (Author) FEUP

Conference proceedings International

Title: ICSI 2015 THE 1ST INTERNATIONAL CONFERENCE ON STRUCTURAL INTEGRITY FUNCHAL

Pages: 140-148

1st International Conference on Structural Integrity (ICSI)

Funchal, PORTUGAL, SEP 01-04, 2015

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Other information

Authenticus ID: P-00G-TST

DOI: 10.1016/j.proeng.2015.08.052

Abstract (EN): The paper presents two practical applications in which the weight function method is used to determine the stress intensity factor as the main structural integrity assessment parameter in linear elastic fracture mechanics. In this method, one may obtain the solution for the stress intensity factor for a given crack configuration and a certain loading, provided a complete solution (the Mode I stress intensity factor K-Ir(a) and the displacements of the crack faces u(Ir)(x, a)) for the same crack problem is known in another loading case called the reference case. Three different cases can be encountered when the weight function method is used: i. The stress intensity factor K-Ir(a) and the displacement field u(Ir)(x, a) are known; ii. Only the stress intensity factor K-Ir(a) is known and iii. Both K-Ir(a) and u(Ir)(x, a) are unknown. In the first case, the method can be applied directly. This paper presents two practical applications for the second and the third case: Stress intensity factors for a strip with a cracked hole subjected to point loads (case 2) and stress intensity factors for an axially cracked thick walled cylinder subjected to internal pressure (case 3). For case 2, the reference stress intensity factors were first calculated using the compounding technique in a reference case (uniform remote traction). Then, an approximate expression of the displacements field found in the literature was used to calculate the weight function. In case 3, the authors propose a solution based on curve fitting of the crack face displacements obtained through finite element analysis. The obtained results were compared with the ones from the literature (where available). In all cases the agreement was very good, showing the reliability of the proposed solutions. (C) 2015 The Authors. Published by Elsevier Ltd.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9