A probabilistic crystal plasticity model for modeling grain shape effects based on slip geometry

Sun, Shang; Sundararaghavan, Veera

doi:10.1016/j.actamat.2012.05.039

Cited by 36 publications

(12 citation statements)

References 23 publications

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“…This is primarily attributed to grain elongation and GDRX. Research suggests the increase in strength is related to the grain aspect ratio, which is indicative of the potential formation of a dislocation cell (subgrain) structure, especially at high aspect ratios (Sun and Sundararaghavan 2012). Grain thickness is also significantly reduced (Liu et al 2014).…”

Section: No Further Strength Reduction Occurs As Evidenced By a Nearlmentioning

confidence: 99%

Overview of aluminum alloy mechanical properties during and after fires

et al. 2015

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Aluminum alloys are increasingly being used in a broad spectrum of load-bearing applications such as lightweight structures, light rail, bridge decks, marine crafts, and offshore platforms. A major concern in the design of land-based and marine aluminum structures is fire safety, at least in part due to mechanical property reduction at temperatures significantly lower than that for steel. A substantial concern also exists regarding the integrity and stability of an aluminum structure following a fire; however, little research has been reported on this topic. This paper provides a broad overview of the mechanical behavior of aluminum alloys both during and following fire. The two aluminum alloys discussed in this work, 5083-H116 and 6061-T651, were selected due to their prevalence as lightweight structural alloys and their differing strengthening mechanisms (5083strain hardened, 6061precipitation hardened). The high temperature quasi-static mechanical and creep behavior are discussed. A creep model is presented to predict the secondary and tertiary creep strains followed by creep rupture. The residual mechanical behavior following fire (with and without applied stress) is elucidated in terms of the governing kinetically-dependent microstructural mechanisms. A review is provided on modeling techniques for residual mechanical behavior following fire including empirical relations, physically-based constitutive models, and finite element implementations. The principal objective is to provide a comprehensive description of select aluminum alloys, 5083-H116 and 6061-T651, to aid design and analysis of aluminum structures during and after fire.

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Section: No Further Strength Reduction Occurs As Evidenced By a Nearlmentioning

confidence: 99%

Overview of aluminum alloy mechanical properties during and after fires

et al. 2015

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“…A specific crystal geometry with two slip systems at orientation −π/6 and +π/6 is considered [12]. In the 2-D elastic stiffness matrix, c 11 = 2 GPa and c 12 = c 44 = 1 GPa.…”

Section: Numerical Resultsmentioning

confidence: 99%

A Hybrid Multi-Scale Model of Crystal Plasticity for Handling Stress Concentrations

Sun

Ramazani

Sundararaghavan

2017

Metals

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Microstructural effects become important at regions of stress concentrators such as notches, cracks and contact surfaces. A multiscale model is presented that efficiently captures microstructural details at such critical regions. The approach is based on a multiresolution mesh that includes an explicit microstructure representation at critical regions where stresses are localized. At regions farther away from the stress concentration, a reduced order model that statistically captures the effect of the microstructure is employed. The statistical model is based on a finite element representation of the orientation distribution function (ODF). As an illustrative example, we have applied the multiscaling method to compute the stress intensity factor K I around the crack tip in a wedge-opening load specimen. The approach is verified with an analytical solution within linear elasticity approximation and is then extended to allow modeling of microstructural effects on crack tip plasticity.

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“…Yield strength will increase as structure evolves from an equiaxed grain structure to high aspect ratio grains. A model coupling grain orientation and grain size/shape effect has been developed [21]. Based on the various strengthening mechanisms in Al-Mg alloy including grain boundary strengthening, solute strengthening, precipitate hardening, dislocation wall strengthening, dislocation sub-structure was found to be the dominant strengthening mechanism in Al5083 [22].…”

Section: Introductionmentioning

confidence: 99%

Quantification of stress-induced damage and post-fire response of 5083 aluminum alloy

Chen

Puplampu

Summers

et al. 2015

Materials Science and Engineering: A

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a b s t r a c tOne of the major concerns regarding the use of lightweight materials in ship construction is the response of those materials to fire scenarios, including the residual structural performance after a fire event. This paper presents a study on creep damage evolution in 5083 marine-grade aluminum alloy and its impact on residual mechanical behavior. Tests conducted at 400°C and pre-selected tensile stress levels were interrupted at target amplitudes of accumulated engineering creep strains to investigate the stress-induced damage using ex-situ characterization. Two-dimensional optical and electron microscopy and three-dimensional X-ray tomography were utilized on samples extracted from these test specimens to characterize the external and internal creep damage. The stress-induced damage is primarily manifested as cavitation and dynamic microstructural evolution. Cavitation morphology, orientation and grain structure evolution were investigated on three perpendicular sample surfaces. A 3D examination of the damage state provided consistent damage information to that obtained from the 2D analysis. The postfire mechanical properties were also evaluated and linked to the microstructural change. The competing processes of cavitation and grain structure evolution were investigated to develop an understanding of the stress-induced damage associated with high temperature creep.

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A probabilistic crystal plasticity model for modeling grain shape effects based on slip geometry

Cited by 36 publications

References 23 publications

Overview of aluminum alloy mechanical properties during and after fires

Overview of aluminum alloy mechanical properties during and after fires

A Hybrid Multi-Scale Model of Crystal Plasticity for Handling Stress Concentrations

Quantification of stress-induced damage and post-fire response of 5083 aluminum alloy

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