Micromechanical cohesive zone relations for ductile fracture

Download

1-s2.0-S2452321616302281-main.pdf

Date

2016-06-24

Author

Yalçınkaya, Tuncay

Metadata

Show full item record

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

Item Usage Stats

195
views

132
downloads

This paper addresses the derivation of a micromechanically motivated incremental mixed-mode traction separation law in the context of cohesive zone modeling of crack propagation in ductile metallic materials. The formulation is based on the growth of an array of pores idealized as cylinders which are considered as the representative volume elements. An upper bound solution is applied for the deformation of the representative volume element and different incremental traction-separation relations are obtained for mixed-mode loading conditions. While most of the current traction-separation relations used in cohesive zone modeling consider phenomenological relations, in the current work micromechanical parameters such as size, shape and spacing of pores describe the level of damage and linkage of the pores characterizes the propagating crack. Copyright (C) 2016 The Authors. Published by Elsevier B.V.

Subject Keywords

Ductile fracture, Cohesive zone modeling, Micromechanics, Micro void growth, Porous plasticity, Limit load analysis

URI

https://hdl.handle.net/11511/36346

DOI

https://doi.org/10.1016/j.prostr.2016.06.217

Collections

Department of Aerospace Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Physics Based Formulation of a Cohesive Zone Model for Ductile Fracture Yalçınkaya, Tuncay (2015-07-01) This paper addresses a physics based derivation of mode-I and mode-II traction separation relations in the context of cohesive zone modeling of ductile fracture of metallic materials. The formulation is based on the growth of an array of pores idealized as cylinders which are considered as therepresentative volume elements. An upper bound solution is applied for the deformation of the representative volume element and different traction-separation relations are obtained through different assumptions.
Development of a Micromechanics Based Cohesive Zone Model and Application for Ductile Fracture Yalçınkaya, Tuncay; Tandoğan, İzzet Tarık (2019-01-01) In this paper, derivation and implementation of a micromechanically motivated traction separation law for cohesive zone modeling of ductile fracture is discussed. The formulation of the framework is based on the growth of pores in an array of representative volume elements where pores are idealized as cylinders. Two relations are derived under normal and shear loading for mode-I and mixed-mode respectively, based on the upper bound for a perfectly plastic material (Yalcinkaya and Cocks (2015), Yalcinkaya an...
Micromechanical Modelling of Carbon Nanotube Reinforced Composite Materials with a Functionally Graded Interphase Gülaşık, Hasan; Göktepe, Serdar; Gürses, Ercan (null; 2018-10-10) This paper introduces a new method of determining the mechanical properties of carbon nanotube-polymer composites using a multi-inclusion micromechanical model with functionally graded phases. The nanocomposite was divided into four regions of distinct mechanical properties; the carbon nanotube, the interface, the interphase and bulk polymer. The carbon nanotube and the interface were later combined into one effective fiber using a finite element model. The interphase was modelled in a functionally graded m...
Micromechanical Modelling of Size Effects in Microforming Yalçınkaya, Tuncay; SIMONOVSKI, IGOR; ÖZDEMİR, İZZET (2017-09-01) This paper deals with the micromechanical modelling of the size dependent mechanical response of polycrystalline metallic materials at micron scale through a strain gradient crystal plasticity framework. The model is implemented into a Finite Element software as a coupled implicit user element subroutine where the plastic slip and displacement fields are taken as global variables. Uniaxial tensile tests are conducted for microstructures having different number of grains with random orientations in plane str...
Microstructure effects on process outputs in micro scale milling of heat treated Ti6Al4V titanium alloys Ahmadi, Masoud; Karpat, Yigit; ACAR, Ozgun; Kalay, Yunus Eren (2018-02-01) This study investigates the influence of materials' microstructural characteristics, including grain size and phase fractions, in micro end milling of heat treated Ti6Al4V titanium alloys. Micro milling process conditions such as feed, depth of cut, and the cutting edge radius of the micro end mill are in the same order of magnitude as the grain size of the material, which gives rise to the anisotropic behavior of the multiphase materials and their deformation characteristics considering their grain size, g...

Citation Formats

T. Yalçınkaya, “Micromechanical cohesive zone relations for ductile fracture,” 2016, vol. 2, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36346.