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Başlık: A thermomechanically consistent constitutive theory for modeling micro-void and/or micro-crack driven failure in metals at finite strains
Yazarlar: Soyarslan, Celal
Bargmann, Swantje
Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü.
Türtük, İsmail Cem
Deliktaş, Babür
AAH-8687-2021
56731098900
7801344314
Anahtar kelimeler: Mechanics
Thermoplasticity
Finite strain
Void growth
Cleavage
Ductile-brittle transition
Ductile-brittle transition
Elastic-plastic solids
Gurson-model
Fracture
Nucleation
Damage
Criteria
Growth
Brittle fracture
Concrete aggregates
Continuum damage mechanics
Cracks
Ductile fracture
Strain
Temperature
Tensile testing
Volume fraction
Brittle transitions
Cleavage
Finite strain
Thermoplasticity
Void growth
Void fraction
Yayın Tarihi: 13-Kas-2015
Yayıncı: World Scientific
Atıf: Soyarslan, C. vd. (2016). "A thermomechanically consistent constitutive theory for modeling micro-void and/or micro-crack driven failure in metals at finite strains". International Journal of Applied Mechanics, 8(1).
Özet: Within a continuum approximation, we present a thermomechanical finite strain plasticity model which incorporates the blended effects of micro-heterogeneities in the form of micro-cracks and micro-voids. The former accounts for cleavage-type of damage without any volume change whereas the latter is a consequence of plastic void growth. Limiting ourselves to isotropy, for cleavage damage a scalar damage variable d is an element of [0, 1] is incorporated. Its conjugate variable, the elastic energy release rate, and evolution law follow the formal steps of thermodynamics of internal variables requiring postulation of an appropriate damage dissipation potential. The growth of void volume fraction f is incorporated using a Gurson-type porous plastic potential postulated at the effective stress space following continuum damage mechanics principles. Since the growth of micro-voids is driven by dislocation motion around voids the dissipative effects corresponding to the void growth are encapsulated in the plastic flow. Thus, the void volume fraction is used as a dependent variable using the conservation of mass. The predictive capability of the model is tested through uniaxial tensile tests at various temperatures Theta is an element of [-125 degrees C, 125 degrees C]. It is shown, via fracture energy plots, that temperature driven ductile-brittle transition in fracture mode is well captured. With an observed ductile-brittle transition temperature around -50 degrees C, at lower temperatures fracture is brittle dominated by d whereas at higher temperatures it is ductile dominated by f.
URI: https://doi.org/10.1142/S1758825116500095
https://www.worldscientific.com/doi/abs/10.1142/S1758825116500095
http://hdl.handle.net/11452/29597
ISSN: 1758-8251
1758-826X
Koleksiyonlarda Görünür:Scopus
Web of Science

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