Results 261 to 270 of about 1,232,743 (307)
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Thermodynamics Theory for Damage Evolution in Solids
2014In this chapter the thermodynamic theory behind damage mechanics is presented. The presented damage evolution model is purely physical, rather than empirical. Entropy production rate is used as a damage metric.
Basaran, Cemal +9 more
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Damage Evolution in Ductile Materials
International Journal of Damage Mechanics, 1996A continuum damage evolution model for ductile materials is derived from the principles of incremental complementary energy and thermodynamics. In accordance with this model, the evolution of damage is dependent on the accumulated strain, the stress triaxiality ratio, and the strain hardening exponent of the material.
Yanghu Mou, Ray P. S. Han
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Damage evolution in mild steel
International Journal of Mechanical Sciences, 1988Abstract Macroscopic attributes of damage resulting from development of microvoids in a cold-strained mild steel are examined. One of them is the relative density change, the evolution of which has been found experimentally in torsion and in a process close to uniaxial tension.
A. Rosochowski, L. Olejnik
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Damage evolution in ductile materials: from micro- to macro-damage
Computational Mechanics, 1995This research presents a new simulation concept of damage evolution for metallic materials under large displacements and deformations. The complete damage range is subdivided into both the micro-damage and the macro-damage range. The micro-damage phase is described by the Cocks/Ashby void-growth model for isotropic, ductile materials under isothermal ...
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Radiation damage evolution in ceramics
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2009A review is presented of recent results on radiation damage production, defect accumulation and dynamic annealing in a number of ceramics, such as silicon carbide, zircon and zirconia. Under energetic particle irradiation, ceramics can undergo amorphization by the accumulation of point defects and defect clusters (silicon carbide) or direct impact ...
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On evolution laws of anisotropic damage
Engineering Fracture Mechanics, 1989Abstract This paper is focused on the development of evolution laws of anisotropic damage. Material damage in the form of microcracks and microcavities leading to macro-mechanical property variations is modelled phenomenologically with some distortion and blurring of fine details, arguing that the extent of material property changes may serve as an ...
C.L. Chow, T.J. Lu
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Damage evolution in viscoelastic polymers
AIP Conference Proceedings, 2000Constitutive relations are derived for viscoelastic polymers. These relations are applicable to polymers for temperatures above their glass transition temperature and strain rates ranging from quasistatic up to shock regimes. Linear viscoelasticity is assumed for small tensile deformations but nonlinear effects, arising from void growth, become ...
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Effects of Damage Distribution on Evolution
1997Recent micromechanically inspired phenomenological theories using internal state variable (ISV) representations of damage have been used to predict the thermomechanical behavior of microcracked solids. These models do not, in an explicit manner, account for distributions of microcracks in a representative volume element (RVE) and have been used ...
TE Lacy, R Talreja, DL McDowell
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Damage evolution and damage model validation in spalled tantalum
Le Journal de Physique IV, 2000The dynamic damage resistance of two grades of very clean tantalum is compared. The materials were loaded to incipient failure using an 80 mm gas gun equipped with soft recovery using a parallel flyer plate experimental configuration. Both loading time and applied shock pressure was varied from 1.1-2 μs and 5.6-9.8 GPa, respectively.
W. R. Thissell +3 more
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A statistical equation of damage evolution
Engineering Fracture Mechanics, 1995Abstract A statistical damage theory is developed from the combination of Continuum Damage Mechanics (CDM), nonequilibrium statistical physics and fracture mechanics. The evolution process of microdefects, which is stochastic in nature due to the inhomogeneous microstructure of materials, is considered as the elementary process of damage to material ...
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