Influence of stress state dependency on ductile fracture modeling in standard test specimens using LS-dyna explicit analysis

Influence of stress state dependency on ductile fracture modeling in standard test specimens using LS-dyna explicit analysis

Bibliographic Details
Main Author: Shelke, Jonny M.
Language:English
Published: University of Cincinnati / OhioLINK 2015
Subjects:
Mechanics
LS dyna
Fracture
Ductile
Metal
Failure
Specimen
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439301655
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin14393016552021-08-03T06:32:47Z Influence of stress state dependency on ductile fracture modeling in standard test specimens using LS-dyna explicit analysis Shelke, Jonny M. Mechanics LS dyna Fracture Ductile Metal Failure Specimen Damage and fracture in engineering materials are a complex phenomenon. Accurate modeling & simulation requires close approximation of standard test conditions and definition of parameters influencing the phenomenon with optimization. An implementation of a strain-based, stress state dependent failure criterion for a ductile material is validated through simulations of standard experiments. For a strain-based failure criterion, the strain required to reach fracture depends on the material, rate of loading, temperature and the state of stress. The rate of loading or strain rate and temperature dependence has been extensively studied by many researchers. Here the effect of stress state on ductile fracture is given importance to achieve accurate results for quasi-static loading without temperature influence. Studying the stress state dependency of the strain to failure is the main objective of this thesis. The state of stress is defined by triaxiality (hydrostatic pressure) and the lode angle parameter (deviatoric stress third invariant). The stress state not only varies with different kinds of loading but also with the location of the stress concentration, geometry of specimen and deformation. It is for this reason that exact original shape of a specimen before plastic deformation cannot be achieved by simply reversing the same forces causing the deformation. The difference lies in the stress state defined by pressure and lode angle. Fracture surface in the principal stress space based on the triaxiality and lode angle parameter is implemented in the damage model GISSMO (Generalized Incremental Stress State dependent MOdel). Experimental data from the tests on Aluminum alloy 2024-T351, a material used widely in aerospace applications is validated through different specimen tests covering combinations of stress states. GISSMO is also implemented & tested for 1045 steel and the already validated Dual Phase 600 steel to evaluate correctness of the present approach. Apart from simulating the correct mode of fracture, a satisfactory match between experimental and simulation results is achieved. 2015-09-08 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439301655 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439301655 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Mechanics
LS dyna
Fracture
Ductile
Metal
Failure
Specimen
spellingShingle Mechanics
LS dyna
Fracture
Ductile
Metal
Failure
Specimen
Shelke, Jonny M.
Influence of stress state dependency on ductile fracture modeling in standard test specimens using LS-dyna explicit analysis
author Shelke, Jonny M.
author_facet Shelke, Jonny M.
author_sort Shelke, Jonny M.
title Influence of stress state dependency on ductile fracture modeling in standard test specimens using LS-dyna explicit analysis
title_short Influence of stress state dependency on ductile fracture modeling in standard test specimens using LS-dyna explicit analysis
title_full Influence of stress state dependency on ductile fracture modeling in standard test specimens using LS-dyna explicit analysis
title_fullStr Influence of stress state dependency on ductile fracture modeling in standard test specimens using LS-dyna explicit analysis
title_full_unstemmed Influence of stress state dependency on ductile fracture modeling in standard test specimens using LS-dyna explicit analysis
title_sort influence of stress state dependency on ductile fracture modeling in standard test specimens using ls-dyna explicit analysis
publisher University of Cincinnati / OhioLINK
publishDate 2015
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439301655
work_keys_str_mv AT shelkejonnym influenceofstressstatedependencyonductilefracturemodelinginstandardtestspecimensusinglsdynaexplicitanalysis
_version_ 1719438863993143296

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