Three dimensional computational analysis of fatigue crack propagation in functionally graded materials

Date

2012-02-01

Author

Sabuncuoglu, Baris
Dağ, Serkan
YILDIRIM, BORA

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

147
views

0
downloads

This article proposes a new finite elements based three dimensional method developed to study the phenomenon of fatigue crack propagation in functionally graded materials (FGMs). The particular problem examined in detail is that of an initially-elliptical crack located in a functionally graded medium, subjected to mode I cyclic loading. The crack is modelled by employing three dimensional finite elements; and the stress intensity factors (SIFs) around the crack front are computed by the application of the displacement correlation technique (DCT). Fatigue crack propagation calculations are based on the Paris-Erdogan crack growth law. The developed procedure makes it possible to generate the crack front profiles corresponding to given numbers of loading cycles. Proposed methods are validated by examining the behaviours of both stationary and propagating cracks. Numerical analyses conducted for an initially-elliptical crack lying in a graded medium demonstrate that the proposed model can effectively capture the evolution of the crack front morphology. Hence, the methodology presented in this article can be used along with fracture toughness data to assess the fatigue lives of functionally graded components containing cracks that possess arbitrary front profiles.

Subject Keywords

General Physics and Astronomy, General Materials Science, General Computer Science, Mechanics of Materials, General Chemistry, Computational Mathematics

URI

https://hdl.handle.net/11511/46613

Journal

COMPUTATIONAL MATERIALS SCIENCE

DOI

https://doi.org/10.1016/j.commatsci.2011.06.010

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

Application of non-convex rate dependent gradient plasticity to the modeling and simulation of inelastic microstructure development and inhomogeneous material behavior Klusemann, Benjamin; Yalçınkaya, Tuncay; Geers, M. G. D.; Svendsen, Bob (Elsevier BV, 2013-12-01) In this study, a two-dimensional rate-dependent gradient crystal plasticity model for non-convex energetic hardening is formulated and applied to the simulation of inelastic microstructure formation. In particular, non-convex hardening is modeled via a Landau-Devonshire potential for self-hardening and two interaction-matrix-based forms for latent hardening. The algorithmic formulation and the numerical implementation treats the displacement and the glide-system slips as the primary field variables. The num...
A density functional theory study on the structures and energetics of CdmTen clusters (m + n <= 6) Pekoz, Rengin; Erkoç, Şakir (Elsevier BV, 2009-06-01) Density functional method has been used to study the structural features and energetics of CdmTen clusters (m + n <= 6). The results presented include the geometric structures, binding energies, Mulliken charges on atoms, vibrational frequencies and the corresponding non-zero infrared intensities, HOMO-LUMO energies and the frontier molecular orbital energy gaps, the most possible dissociation channels and their corresponding energies of the clusters.
On tension-compression asymmetry in ultrafine-grained and nanocrystalline metals Gürses, Ercan (Elsevier BV, 2010-12-01) We present present a physically motivated computational study explaining the tension/compression (T/C) asymmetry phenomenon in nanocrystalline (nc) and ultrafine-grained (ufg) face centered cubic (fcc) metals utilizing a variational constitutive model where the nc-metal is modeled as a two-phase material consisting of a grain interior phase and a grain boundary affected zone (GBAZ). We show that the existence of voids and their growth in GBAZ renders the material pressure sensitivity due to porous plasticit...
Dimensional analysis of the thermomechanical problem arising during through-hardening of cylindrical steel components Şimşir, Caner; Hoffmann, Franz; Zoch, Hans-Werner (Elsevier BV, 2010-09-01) This article concerns the dimensional analysis of the complex thermomechanical problem arising during through-hardening of cylindrical steel components. A complete and independent set of physically based dimensionless numbers was derived using the weak formulation method and the individual effects of dimensionless numbers with sensitive material parameters were investigated by finite element simulations. The results demonstrate potential of the approach in simplification of the model and the identification ...
Silicene nanoribbons: Molecular-dynamics simulations Ince, Alper; Erkoç, Şakir (Elsevier BV, 2011-01-01) Structural properties of silicene nanoribbons have been investigated by performing classical molecular-dynamics simulations using atomistic many-body potential energy functions at low and room temperatures with finite and infinite lengths. It has been found that finite length models are more likely to form tubular structures at room temperature.

Citation Formats

B. Sabuncuoglu, S. Dağ, and B. YILDIRIM, “Three dimensional computational analysis of fatigue crack propagation in functionally graded materials,” COMPUTATIONAL MATERIALS SCIENCE, pp. 246–252, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46613.