An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates

Uniaxial damage modelling use constituent components of the stress/strain measured data which have inherent scatter. Models developed for this purpose have also attempted to address the issues related to failure mechanisms within a multiaxial stress state context. This paper presents the multiscale...

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Main Authors:	Nasrual Azuan, Alang, Nikbin, Kamran M.
Format:	Article
Language:	English English
Published:	Elsevier Ltd 2018
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/20415/ http://umpir.ump.edu.my/id/eprint/20415/ http://umpir.ump.edu.my/id/eprint/20415/ http://umpir.ump.edu.my/id/eprint/20415/1/An%20Analytical%20and%20Numerical%20Approach%20to%20Multiscale%20Ductility%20Constraint%20Based%20Model%20to%20Predict%20Uniaxial-Multiaxial%20Creep%20Rupture%20and%20Cracking%20Rates.pdf http://umpir.ump.edu.my/id/eprint/20415/2/An%20Analytical%20and%20Numerical%20Approach%20to%20Multiscale%20Ductility%20Constraint%20Based%20Model%20to%20Predict%20Uniaxial-Multiaxial%20Creep%20Rupture%20and%20Cracking%20Rates%201.pdf

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spelling	ump-204152018-08-01T03:05:49Z http://umpir.ump.edu.my/id/eprint/20415/ An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates Nasrual Azuan, Alang Nikbin, Kamran M. TJ Mechanical engineering and machinery Uniaxial damage modelling use constituent components of the stress/strain measured data which have inherent scatter. Models developed for this purpose have also attempted to address the issues related to failure mechanisms within a multiaxial stress state context. This paper presents the multiscale approach to constraint by using the relationship between Monkman-Grant (MG) uniform failure strain and local sub-grain stress state to predict creep damage and rupture under uniaxial/multiaxial conditions. In essence, a global geometric constraint and a time-dependent local sub-grain constraint is defined with the latter controlling the failure response of the geometry. The model compliments and is in agreement with the established NSW model is also used to predict the lower/upper bound of cracking rates in crack dominated geometries. The model is employed into a finite element (FE) to assess its capability to numerically predict the rupture of plain and multiaxial notched bar specimens based on appropriate void growth models. For verification, creep constitutive properties of long term data from uniaxial and multiaxial tests on Grade 92 martensitic steels from various databases, where available, are used to establish the procedure. Given the level of scatter in the data and fabrication and testing uncertainties that cannot be accounted for in such databases, it is shown that the model is sufficiently simple and robust to be developed for use in conservatively predicting very long term failure times. Elsevier Ltd 2018-01 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/20415/1/An%20Analytical%20and%20Numerical%20Approach%20to%20Multiscale%20Ductility%20Constraint%20Based%20Model%20to%20Predict%20Uniaxial-Multiaxial%20Creep%20Rupture%20and%20Cracking%20Rates.pdf pdf en http://umpir.ump.edu.my/id/eprint/20415/2/An%20Analytical%20and%20Numerical%20Approach%20to%20Multiscale%20Ductility%20Constraint%20Based%20Model%20to%20Predict%20Uniaxial-Multiaxial%20Creep%20Rupture%20and%20Cracking%20Rates%201.pdf Nasrual Azuan, Alang and Nikbin, Kamran M. (2018) An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates. International Journal of Mechanical Sciences, 135. pp. 342-352. ISSN 0020-7403 https://doi.org/10.1016/j.ijmecsci.2017.11.030 10.1016/j.ijmecsci.2017.11.030
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Nasrual Azuan, Alang Nikbin, Kamran M. An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates
description	Uniaxial damage modelling use constituent components of the stress/strain measured data which have inherent scatter. Models developed for this purpose have also attempted to address the issues related to failure mechanisms within a multiaxial stress state context. This paper presents the multiscale approach to constraint by using the relationship between Monkman-Grant (MG) uniform failure strain and local sub-grain stress state to predict creep damage and rupture under uniaxial/multiaxial conditions. In essence, a global geometric constraint and a time-dependent local sub-grain constraint is defined with the latter controlling the failure response of the geometry. The model compliments and is in agreement with the established NSW model is also used to predict the lower/upper bound of cracking rates in crack dominated geometries. The model is employed into a finite element (FE) to assess its capability to numerically predict the rupture of plain and multiaxial notched bar specimens based on appropriate void growth models. For verification, creep constitutive properties of long term data from uniaxial and multiaxial tests on Grade 92 martensitic steels from various databases, where available, are used to establish the procedure. Given the level of scatter in the data and fabrication and testing uncertainties that cannot be accounted for in such databases, it is shown that the model is sufficiently simple and robust to be developed for use in conservatively predicting very long term failure times.
format	Article
author	Nasrual Azuan, Alang Nikbin, Kamran M.
author_facet	Nasrual Azuan, Alang Nikbin, Kamran M.
author_sort	Nasrual Azuan, Alang
title	An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates
title_short	An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates
title_full	An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates
title_fullStr	An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates
title_full_unstemmed	An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates
title_sort	analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates
publisher	Elsevier Ltd
publishDate	2018
url	http://umpir.ump.edu.my/id/eprint/20415/ http://umpir.ump.edu.my/id/eprint/20415/ http://umpir.ump.edu.my/id/eprint/20415/ http://umpir.ump.edu.my/id/eprint/20415/1/An%20Analytical%20and%20Numerical%20Approach%20to%20Multiscale%20Ductility%20Constraint%20Based%20Model%20to%20Predict%20Uniaxial-Multiaxial%20Creep%20Rupture%20and%20Cracking%20Rates.pdf http://umpir.ump.edu.my/id/eprint/20415/2/An%20Analytical%20and%20Numerical%20Approach%20to%20Multiscale%20Ductility%20Constraint%20Based%20Model%20to%20Predict%20Uniaxial-Multiaxial%20Creep%20Rupture%20and%20Cracking%20Rates%201.pdf
first_indexed	2023-09-18T22:29:24Z
last_indexed	2023-09-18T22:29:24Z
_version_	1777416184802574336

An analytical and numerical approach to multiscale ductility constraint based model to predict uniaxial/multiaxial creep rupture and cracking rates

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