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State of Stress Modelling by 2-D Finite Element Analysis of Fracture Toughness Specimens

This paper should clarify some details related to finite element (FE) analysis of the single edge notch bend (SENB) specimen with X-shaped welded joint as an example. The specimen consists in a complex geometry as well as material mismatch, what makes the FE modelling more difficult. The main advantage of 2-D calculations is the short time needed for the computation of any fracture parameter, but it involves assumption about the state of stress. This depends on the thickness of the specimen, plane section position and loading level. Plane strain state (PE) is very conservative approach valid for thick structures only, while plane stress state (PS) is appropriate in the case of thin specimens. The use of 3-D finite elements is necessary for the specimens with medium thickness or in the case when the symmetry of the specimen according to the thickness is not present.

Fracture toughness specimen; Geometry Mismatch; Material Mismatch; Plane stress; Plane strain; Mixed State-of-Stress

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