Three-dimensional analysis of bimaterial cracked plates
01 Aug 1989-International Journal of Fracture (Springer Science and Business Media LLC)-Vol. 40, Iss: 4
About: This article is published in International Journal of Fracture.The article was published on 1989-08-01. It has received 1 citations till now.
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TL;DR: In this paper, fracture studies have been carried out on dissimilar metal plate (DMP) with center crack made up of ferritic steel (SA 508 Gr.3 Cl.1), austenitic steel(SA312 Type 304LN), and Inconel- 182 alloy (ENiCrFe-3).
Abstract: Dissimilar metal joints (DMJs) are more common in the coolant systems of most of the engineering applications and are subjected to variety of loadings. To understand the constraint effect of the dissimilar metal welded joints (DMJs), fracture studies have been carried out on dissimilar metal plate (DMP) with center crack made up of ferritic steel (SA 508 Gr.3 Cl.1), austenitic steel (SA312 Type 304LN) and Inconel – 182 alloy (ENiCrFe-3). 2-D and 3-D finite element analysis (FEA) is carried out on the DMP with centre crack (length = 250 mm, width = 150 mm) for various crack lengths (15, 20, 30 and 50 mm) and various dissimilar metal welded joint widths (DMJWs) (5, 10, 20, 30, 40 and 50 mm) to evaluate stress intensity factor (SIF). SIF has been evaluated by employing domain integral method. It is observed from the studies that, (i) SIF increases with increase of crack length and DMJW, (ii) 3-D finite element analysis yields realistic SIF (iii) SIF of DMP reduces compared to homogenous plate, (iv) constraint effect is found to be significant if DMJW is less than the initial crack length, resulted in reduction of SIF (iv) constraint effect is found to be insignificant if DMJW is more than 20 mm and the ratio of crack length to DMJW is greater than 0.75. The study will be useful for damage tolerant analysis of structures/components which in turn will be helpful for repair, retrofitting of components and in-service inspection.
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TL;DR: In this paper, the inverse square root singularity of the plane eight noded isoparametric element has been used to calculate stress intensity factors of elastic fracture mechanics, including constant strain and rigid body motion modes.
Abstract: Quadratic isoparametric elements which embody the inverse square root singularity are used in the calculation of stress intensity factors of elastic fracture mechanics. Examples of the plane eight noded isoparametric element show that it has the same singularity as other special crack tip elements, and still includes the constant strain and rigid body motion modes. Application to three-dimensional analysis is also explored. Stress intensity factors are calculated for mechanical and thermal loads for a number of plane strain and three-dimensional problems.
1,418 citations
361 citations
TL;DR: In this paper, a consistent method for computing stress-intensity factors from three-dimensional quarter-point element nodal displacements is presented, which is generalized to permit functional evaluation of stress intensity factors along the crack front.
Abstract: A consistent method for computing stress-intensity factors from three-dimensional quarter-point element nodal displacements is presented. The method is generalized to permit functional evaluation of stress-intensity factors along the crack front. Embedded, surface, and corner crack problems are solved using the proposed technique. Results are compared to previous finite element and boundary element solutions. The comparison shows that use of the functional evaluation technique allows a dramatic decrease in problem size while still maintaining engineering accuracy. Next, a three-dimensional stress-intensity factor calibration of an unusual specimen configuration is presented. By taking advantage of the proposed technique, the calibration was performed with little difference in cost over the more usual two-dimensional approach. Moreover, the three-dimensional solution revealed intersting behaviour that would have been undetected by a two-dimensional solution. Finally, the results of a study on optimum size of the quarter-point element are presented. Surprisingly, Poisson ratio is shown to have marked effect on optimum element size.
209 citations
01 Jan 1987
TL;DR: In this article, the basic equations of Fracture Mechanics are evaluated with particular emphasis on the numerical treatment, and a short introduction sketching the continuum mechanics description is given, followed by a short discussion of the dynamics.
Abstract: After a short introduction sketching the continuum mechanics description, the basic equations of Fracture Mechanics will be evaluated with particular emphasis on the numerical treatment.
130 citations