On Fracture Analysis Using an Element Overlay Technique

Okada, Hiroshi; Endoh, S.; Kikuchi, Masanori

doi:10.4028/www.scientific.net/KEM.261-263.681

Paper Titles

Thermo-Mechanical Behaviors of Ceramic-Coated Structures in Outer Space Using Partial Model Technique
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Parametric Study on Compression Deformation Behavior of Conformal Load-Bearing Smart Skin Antenna Structure
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Stress Intensity Factors of an Infinite Solid with Two Cavities having a Crack Emanating from the Cavity under Tension
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Dimple Fracture Simulation of Fracture Specimen under Different Constraint Conditions
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On Fracture Analysis Using an Element Overlay Technique
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The Implementation of Inter-Element Model for Crack Growth Simulation
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Finite Element Analyses for Thickness Effects on J-Integral Testing using Non-Standard Testing Specimens
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Three-Dimensional Elastic-Plastic Finite Element Analysis of Biaxially Loaded Cracked Plates
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2D Vector Cellular Automata Model for Simulating Fracture of Rock under Tensile Condition
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Home Key Engineering Materials Advances in Fracture and Failure PreventionOn Fracture Analysis Using an Element Overlay...

On Fracture Analysis Using an Element Overlay Technique

Abstract:

In this paper, a simple but highly accurate analytical method to evaluate stress intensity factors based on an element overlay technique is presented. When a crack exists in a structure, we need to analyze its global deformation as well as local deformation field around the tip of the crack. This naturally leads us to a consideration on some kind of multi-scale analysis strategies. Thus, we adopt the element overlay technique (S-FEM) which is a kind of multi-scale methodologies. In this paper, we present i) numerical implementation of element overlay technique (S-FEM), ii) method to calculate stress intensity factors (virtual crack closure-integral method, VCCM), iii)accuracies of evaluated stress intensity factors and iv) some discussions.

Info:

Periodical:

Key Engineering Materials (Volumes 261-263)

Main Theme:

Advances in Fracture and Failure Prevention

Edited by:

Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka

Pages:

681-686

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.261-263.681

Citation:

H. Okada et al., "On Fracture Analysis Using an Element Overlay Technique", Key Engineering Materials, Vols. 261-263, pp. 681-686, 2004

Online since:

April 2004

Authors:

Hiroshi Okada, S. Endoh, Masanori Kikuchi

Keywords:

Finite Element Model (FEM), Stress Intensity Factor (SIF), S-Version Finite Element Method (S-FEM), Virtual Crack Closure Integral Method (VCCM)

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References

[1] J. Fish, Int. J. Computers and Structures. 43 (1992) p.539.

[2] J. Fish, and R. Guttal, Int. J. Numer. Methods. Eng. 39 (1996) p.3461.

[3] K. J. Bathe: Finite Element Procedures, Prentice Hall International, Upper Saddle River, NJ (1996).

[4] S. K. Maiti, Engrg. Fract. Mech, 41-3 (1992) p.339.

[5] E. F. Rybicki, and M. F. Kanninen, Engrg. Fract. Mech, 9 (1977) p.931.

[6] O. C. Zienkiewicz, and R. L. Taylor : The Finite Element Method Fourth Edition, McGraw-Hill Book Company (1988).

[7] H. Okamura: Linear Fracture Mechanics (in Japanese ), Baihukan. Tokyo. Japan (1976).

Paper TitlePages

Fracture Behaviors of Multi-Crack in Rock-Like Material

Authors: Li Yun Li, F.X. Che, D.A. Liu

Abstract: Multi-crack problems are deeply involved in rock-like material and rock engineering. In order to study the influences of lateral stress and inclined crack angle on the failure load of the multi-cracked body, uniaxial and biaxial compression fracture tests are conducted on plate specimens with regular distributed multi-cracks. The stress distribution and the stress intensity factors KI and KII for every crack tips of the specimens are calculated by FEM. The experiment revealed that the failure load of the multi-cracked specimens increase obviously with the increase of the lateral pressure σ2 and the inclined crack angle α. And the multi-cracked specimens will hardly initiate propagation under equal biaxial compression. Analyses have been shown that these can be explained by the variation of KII with the σ2 and the α.

1523

Three Dimensional Fracture Analysis of FGM Coatings

Authors: Ozgur Inan, Serkan Dag, Fazil Erdogan

Abstract: In this study the three – dimensional surface cracking of a graded coating bonded to a homogeneous substrate is considered. The main objective is to model the subcritical crack growth process in the coated medium under a cyclic mechanical or thermal loading. Because of symmetry, along the crack front conditions of mode I fracture and plane strain deformations are assumed to be satisfied. Thus, at a given location on the crack front the crack propagation rate would be a function of the mode I stress intensity factor. A three – dimensional finite element technique for nonhomogeneous elastic solids is used to solve the problem and the displacement correlation technique is used to calculate the stress intensity factor.

373

Creep Crack Interaction of High Temperature Structure with Multiple Cracks

Authors: Jun Si, Fu Zhen Xuan, Shan Tung Tu

Abstract: The interaction behavior of two non-aligned through-wall cracks in flat plates is investigated by the finite element method (FEM) under extensive creep condition. The time-dependent fracture parameter C*-integral along the crack tips are calculated and compared to the results of a single crack of the same size. For comparison purpose, the interaction of stress intensity factors (SIFs) is also examined in the study. The results indicated that interaction of multiple cracks is different between the time- dependent fracture characterized by C*-integral and linear elastic fracture noted by SIF. The magnifying factors of time-dependent fracture are obviously larger than that of the linear elastic fracture cases. Therefore, the current re-characterization rule for multiple cracks developed from linear elastic fracture analysis may lead to a non-conservative result and should be modified when it is used in the assessment of time dependent failure.

105

Fatigue Crack Growth Simulation Using S-Version FEM

Authors: Masanori Kikuchi, Yoshitaka Wada, Masafumi Takahashi, Yu Long Li

Abstract: Fatigue crack growth under mixed mode loading conditions is simulated using S-FEM. By using S-FEM technique, only local mesh should be re-meshed and it becomes easy to simulate crack growth. By combining with auto-meshing technique, local mesh is re-meshed automatically, and curved crack path is modeled easily. Plural fatigue crack problem is solved by this technique. For two parallel crack problem, criteria of crack coalescence are proposed. By simulating this problem by S-FEM, it is verified these criteria are conservative ones.

133

Experimental and Numerical Analysis of the Fatigue Behaviour of Panels Repaired by Patches in Composite Material

Authors: F. Ricci, F. Franco, Nicola Montefusco

Abstract: In this paper, the mechanisms of propagation of the damage in aluminum panels repaired with bonded composite patches of different mechanical characteristics is analyzed. The aim of this study is to analyze analytically, experimentally and numerically the advantage of the use of bonded composite patches to increase the fatigue life and to reduce the state of tension at the crack tips. The experimental results show that both static strength and fatigue life of the repaired aluminum panel has significantly increased due to the bonded composite patches. The different patches and adhesive, used for cracked panels, have provided about a 100-110% improvement in the fatigue life and a 30-35% decrease in the stress intensity factor. A comparison between finite elements calculations and experimental data has been carried out. The good agreement between the experimental data and the numerical ones has demonstrated the possibility to obtain an optimized design of bonded patches with the numerical tools.

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