An explicit weight function for semi-elliptical surface cracks

Journal Article · Thu May 01 04:00:00 EDT 1997 · Journal of Pressure Vessel Technology

DOI:https://doi.org/10.1115/1.2842287· OSTI ID:477463

Beghini, M; Bertini, L; Gentili, A ^[1]

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1. Univ. di Pisa (Italy). Dipt di Costruzioni Meccaniche e Nucleairi

An explicit weight function which allows determination of the stress intensity factor for a semi-elliptical surface crack under arbitrary loading is proposed. It was derived by the approximate solution valid for an embedded elliptical crack in infinite body, and a suitable corrective function to account for the free surface effect was obtained on the basis of several accurate stress intensity factor solutions found in literature. By this weight function and a simple numerical quadrature, the SIF at any point of the crack front can be calculated for any loading condition. The method requires negligible time for model preparation and elaboration and little computing resources. It was tested for many crack shapes and loading conditions, and an accuracy of a few percent in the stress intensity factor evaluation was observed. This suggests using the proposed weight function in many practical problems, typical for pressure vessel technology, in which several fracture mechanics analyses are required.

• Sponsoring Organization: USDOE
• OSTI ID: 477463
• Journal Information: Journal of Pressure Vessel Technology, Journal Name: Journal of Pressure Vessel Technology Journal Issue: 2 Vol. 119; ISSN JPVTAS; ISSN 0094-9930
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CALCULATION METHODS
CRACKS
FRACTURE MECHANICS
PRESSURE VESSELS
STRESS INTENSITY FACTORS
WEIGHTING FUNCTIONS