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• W2065409872 abstract "A set of constitutive relations that describe the deformation behavior of metals under complex loading or hold time histories is needed for predictive applications in metal forming, creep, creep-fatigue interactions and other situations. It is desirable for such a constitutive model to be based on physical processes that occur within the metal over wide ranges of temperatures and strain rates, and yet the model must contain parameters measurable from mechanical tests. The objective of this work is to combine into a generalized, unified model the existing level of understanding of the various physical processes, such as strain hardening, recovery, dislocation velocity dependence of effective stress, anelastic and grain boundary effects. Part II of this two-part paper uses this model of incremental deformation, incorporating strain history dependence, for predicting material behavior in various laboratory experiments. Based on a constitutive model developed in Part I of this paper, numerical calculations have been made here to check the capabilities of the model for predicting various aspects of material deformation behavior. Of particular interest are common laboratory experiments such as the tensile test, creep test, and other variations, such as, load relaxation, strain-rate change, decrementai unloading, unloading holding reloading and reverse loading tests. Since the various inputs for the model, such as basic strain hardening behavior, recovery rate constants and effective stresses, are not well known in their desired forms for the present model for any given material, no attempt has been made to simulate the stress level for a particular material. However, insights into the deformation phenomena are obtained through simulation of the overal material response over wide ranges of strain rates and temperatures. Confidence gained through this verification now opens the avenue for conducting suitable experiments necessary to determine the various parameters. On a besoin d'un ensemble de relations d'état pour décrire le comportement d'un métal au cours de sa déformation sous des charges complexes et pour des maintiens de diverses durées, afin de faire des prévisions sur le formage du métal, le fluage, les interactions fluage-fatigue et d'autres situations. Il serait souhaitable qu'un tel modèle d'état repose sur des phénomènes physiques se produisant dans le métal pour une large gamme de températures et de vitesses de déformation et qu'il contienne cependant des paramètres mesurables à partir d'essais mécaniques. Le but de ce travail est de combiner dans un modèle généralisé et unifié les niveaux de compréhension actuels de divers phénomènes physiques tels que l'écrouissage, la restauration, la variation de la vitesse des dislocations en fonction de la contrainte effective, les effets anélastiques et les effets des joints de grains. La seconde partie de cet article utibse ce modèle d'une déformation, incrémentale qui tient compte de l'histoire de la déformation, pour prévoir le comportement d'un matériau au cours de divers essais de laboratoire. Ein Satz von Grundbeziehungen, die das Verformungsverhalten von Metallen mit komplexer Last- oder Haltezeitgeschichte beschreiben, ist für Voraussagen in der Metallfonngebung, beim Kriechen, bei der Wechselwirkung Kriechen-Ermüdung und in anderen Gebieten notwendig. Solch ein Grundmodell sollte auf den physikalischen Prozessen aufbauen, die im Metall über einen groβen Bereich von Temperatur und Dehngeschwindigkeit ablaufen; auch muβ das Modell Parameter enthalten, die mit mechanischen Versuchen gemessen werden können. Anliegen dieser Arbeit ist es, die vorhandene Kenntnis der verschiedenartigen physikalischen Prozesse wie Verfestigung, Erholung, Abhängigkeit der Versetzungsgeschwindigkeit von der effektiven Spannung, anelastische und Korngrenzeffekte in einem verallgemeinerten einheitlichen Modell zu vereinigen. In einem weiteren Teil dieser zweigeteilten Arbeit wird dieses Modell der inkrementalen Verformung unter Einschluβ der Abhängigkeit von der Verfor-mungsgeschichte benutzt, das Materialverhalten für verschiedene Laborexperimente im voraus zu beschreiben." @default.
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• W2065409872 date "1980-11-01" @default.
• W2065409872 modified "2023-09-27" @default.
• W2065409872 title "A physically-based constitutive model for metal deformation" @default.
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• W2065409872 doi "https://doi.org/10.1016/0001-6160(80)90046-2" @default.
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