Extension of the viscoplasticity theory based on overstress (VBO) to capture non-standard rate dependence in solids

Ho, Kwangsoo; Krempl, E.

doi:10.1016/s0749-6419(01)00011-0

Cited by 93 publications

(35 citation statements)

References 27 publications

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“…The value of the parameter m2 is estimated for very small inelastic strains (less than 0.2%) according to (10) which can be written as:…”

Section: Modelling and Parameters Identificationmentioning

confidence: 99%

“…The problem can also be described phenomenologically with regard to the basic principle of thermodynamics of continuous media and by defining adequate internal variables. According to these phenomenological considerations, models developed for metals can be used also for the description of the nonlinear behaviour after yielding of polymers [10,11,12,13]. However to date, the investigation of the viscoplastic response of polymers is still an important challenge.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of Innovative Controllable Structures Made of Granular Materials

Zalewski¹,

Skalski

2015

New Contributions in Information Systems and Technologies

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Abstract. The viscoplastic behavior of "innovative" structure is considered. Investigated structures are created on the basis of vacuum packed particles. Partial vacuum generated inside a hermetic sleeve filled with loose granular material transforms the system from semi-liquid to semisolid state. Such phenomenon, known as a "jamming mechanism", is strongly nonlinear in considered structures. Special granular structures have recently found interesting engineering and biomedical applications such as vacuum mattresses, orthopedic orthesis, universal robotic grippers and flexible endoscopes. To capture a response of the specially designed granular sample to external loading, a Bodner-Partom viscoplastic constitutive model has been chosen. The identification procedure is based on experimental compression tests realized at various strain rates and underpressure levels.

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“…The value of the parameter m2 is estimated for very small inelastic strains (less than 0.2%) according to (10) which can be written as:…”

Section: Modelling and Parameters Identificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling of Innovative Controllable Structures Made of Granular Materials

Zalewski¹,

Skalski

2015

New Contributions in Information Systems and Technologies

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“…even at low strains. Many authors were trying to improve modeling of this phenomenon by including: -different microscopic and macroscopic aspects of structural evolution (Drozdov and Christiansen, 2003;Ahzi et al, 2003;Oshmyan et al, 2004Oshmyan et al, , 2005Oshmyan et al, , 2006, particularly, crystalline morphology and chain conformations were taken into account for polyethylene (Popelar et al, 1990;Hobeika et al, 2000;and Sirotkin et al, 2001); -phenomenological viscoelastic or viscoplastic modeling (Yao and Krempl, 1985;Kichenin et al, 1996;Chaboche, 1997;Chambaudet et al, 1998;Ho and Krempl, 2000;Stehly and Rémond, 2002;Krempl and Ho, 2002;Krempl and Khan, 2003;André et al, 2003;Colak, 2004;Rémond, 2005). The crystalline morphology of polyethylene is highly influenced by the stress over threshold, inducing separation, rotation and torque of the lamellae, the slipping of lamella units, their reorientation inside spherulites, etc.…”

Section: Introductionmentioning

confidence: 99%

Non Linear Strain Rate Dependency and Unloading Behavior of Semi-Crystalline Polymers

Hizoum

Rémond

Bahlouli

et al. 2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Modélisation des non-linéarités en vitesse de déformation et du comportement en déchargement des polymères semi-cristallins -Les lois viscoélastiques classiques ne permettent pas de décrire complètement les comportements caractéristiques des polymères semi-cristallins, comme ceux observés lors de sauts de vitesses ou en déchargement. Nous présentons dans cet article certaines particularités du comportement mécanique pour un polyéthylène ou un polypropylène en petites déformations. Un modèle physique incluant une évolution de la microstructure est présenté et comparé aux observations expérimentales. Ce modèle permet une forte amélioration des simulations des comportements mécaniques en chargement et déchargement pour une large classe de polymères semicristallins. Abstract -Non Linear Strain Rate Dependency and Unloading Behavior of Semi-Crystalline

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“…The ''unified'' viscoplasticity theory based on overstress (VBO), developed by Ho and Krempl, 22 is used to simulate strain rate dependence, creep, relaxation, cyclic hardening/softening, as well as ratcheting (namely, plastic strain accumulation due to cyclic stressing with nonzero mean stress). [23][24][25][26][27] The VBO model does not use a yield surface and loading/unloading criterion.…”

mentioning

confidence: 99%

A critical review of constitutive models for solders in electronic packaging

Chen

Zhao

2017

Advances in Mechanical Engineering

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Owing to their superior electrical, thermal, and mechanical properties, solder joints are the most widely used interconnection materials in electronic product packaging. Because the failure of the whole electronic packaging is often induced by the failure of solders, modeling and simulation of solder joint performance are quite important in ensuring the quality and reliability of electronic products. In fact, the accuracy of reliability design of electronic packaging is dependent on accelerated reliability tests, material constitutive models, finite element modeling, and fatigue-life prediction models. Here, the material constitutive model plays the most important role in the development of electronic reliability design because the stress, strain, and strain energy density adopted in finite element modeling and fatigue-life prediction are all computed and derived from the constitutive model. In this work, the constitutive models developed for simulating the complex stress and strain response of solders are critically reviewed. To make the description concise and comprehensive, the constitutive models were categorized into two types: the constitutive models with and without the definition of yield surface. The prediction capabilities, application scope, merits and shortcomings, and objective suggestions for the further development of constitutive models for solders in electronic packaging are proposed.

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Extension of the viscoplasticity theory based on overstress (VBO) to capture non-standard rate dependence in solids

Cited by 93 publications

References 27 publications

Modelling of Innovative Controllable Structures Made of Granular Materials

Modelling of Innovative Controllable Structures Made of Granular Materials

Non Linear Strain Rate Dependency and Unloading Behavior of Semi-Crystalline Polymers

A critical review of constitutive models for solders in electronic packaging

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