Dynamic numerical simulations of void growth and coalescence with stress triaxiality maintained constant-Application to ductile solids with secondary voids

2008 ◽  
Vol 24 (12) ◽  
pp. 2035-2045
Author(s):  
L. Siad
Keyword(s):  
Numerical Simulations ◽  
Void Growth ◽  
Stress Triaxiality ◽  
Void Growth And Coalescence

Void Growth and Coalescence in Porous Plastic Solids With Sigmoidal Hardening

2019 ◽  
Vol 86 (9) ◽  
Author(s):  
Padmeya P. Indurkar ◽  
Shailendra P. Joshi
Keyword(s):  
Void Growth ◽  
Damage Model ◽  
Stress Triaxiality ◽  
Unit Cell ◽  
Porous Solid ◽  
Effective Response ◽  
Porosity Evolution ◽  
Aspect Ratios ◽  
Spherical Voids ◽  
Void Growth And Coalescence

Abstract This paper presents an analysis of void growth and coalescence in isotropic, elastoplastic materials exhibiting sigmoidal hardening using unit cell calculations and micromechanics-based damage modeling. Axisymmetric finite element unit cell calculations are carried out under tensile loading with constant nominal stress triaxiality conditions. These calculations reveal the characteristic role of material hardening in the evolution of the effective response of the porous solid. The local heterogeneous flow hardening around the void plays an important role, which manifests in the stress–strain response, porosity evolution, void aspect ratio evolution, and the coalescence characteristics that are qualitatively different from those of a conventional power-law hardening porous solid. A homogenization-based damage model based on the micromechanics of void growth and coalescence is presented with two simple, heuristic modifications that account for this effect. The model is calibrated to a small number of unit cell results with initially spherical voids, and its efficacy is demonstrated for a range of porosity fractions, hardening characteristics, and void aspect ratios.

Void growth and coalescence in hexagonal close packed crystals

2019 ◽  
Vol 125 ◽  
pp. 198-224 ◽  
Author(s):  
Balaji Selvarajou ◽  
Shailendra P. Joshi ◽  
A. Amine Benzerga
Keyword(s):  
Void Growth ◽  
Hexagonal Close Packed ◽  
Void Growth And Coalescence

A dynamic investigation of observable void growth and coalescence in pure copper sheets

2011 ◽  
Vol 110 (9) ◽  
pp. 094905 ◽  
Author(s):  
Ma Dongfang ◽  
Chen Danian ◽  
Wu Shanxing ◽  
Wang Huanran ◽  
Cai Canyuan ◽  
...  
Keyword(s):  
Void Growth ◽  
Pure Copper ◽  
Void Growth And Coalescence ◽  
Dynamic Investigation

scholarly journals Void growth and coalescence in a three-dimensional non-periodic void cluster

2018 ◽  
Vol 139-140 ◽  
pp. 65-78 ◽  
Author(s):  
Victor Manuel Trejo Navas ◽  
Marc Bernacki ◽  
Pierre-Olivier Bouchard
Keyword(s):  
Void Growth ◽  
Three Dimensional ◽  
Void Growth And Coalescence

scholarly journals Void growth and coalescence in irradiated copper under deformation

2018 ◽  
Vol 502 ◽  
pp. 123-131 ◽  
Author(s):  
P.O. Barrioz ◽  
J. Hure ◽  
B. Tanguy
Keyword(s):  
Void Growth ◽  
Void Growth And Coalescence

Prediction of Creep Void Growth in Heat-Affected Zone of High Chromium Steel Weldments Considering Multiaxial Stress State

2012 ◽  
Author(s):  
Eiji Murakami ◽  
Masamitsu Hashimoto ◽  
Seiji Kikuhara
Keyword(s):  
Stress State ◽  
Heat Affected Zone ◽  
Void Growth ◽  
Stress Triaxiality ◽  
Chromium Steel ◽  
Growth Behavior ◽  
High Chromium ◽  
Multiaxial Stress State ◽  
The Relationship ◽  
Triaxiality Factor

This paper deals with a method for predicting creep void growth in heat-affected zone (HAZ) of high chromium steel weldments. The method has been proposed by authors based on the relationship between creep void density increasing rate and multiaxial stress state. In this study, internal pressure creep tests of ASME grade 91 (9Cr-1Mo-Nb-V) tubes with longitudinal weldments subjected to several internal pressures have been conducted to reveal creep void growth behavior in HAZ. In addition, finite element creep analyses of the specimens at different creep strain rates in base metal, weld metal and HAZ have been carried out to investigate distribution of stresses and stress triaxiality factor in HAZ. A comparison between stress distributions and void distributions revealed that stress triaxiality factor predominantly affects growth behavior of creep voids. From the result, the relationship between creep void density increasing rate and the parameter as a function of principal stress and triaxiality factor was established. It was found that there is a proportional relationship between creep void density increasing rate and the parameter to represent stress multiaxiality on the logarithmic graph. To verify proposed prediction method, the method was applied to the internal pressure creep test specimens at different experimental conditions. As a result, the predicted void distribution and void density increasing rates were in good agreement with experimental results.

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