Results 231 to 240 of about 4,272,554 (282)

Damage Evolution in Ductile Materials

International Journal of Damage Mechanics, 1996
A 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, 1988
Abstract 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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An insight to formation damage evolution

Journal of Petroleum Science and Engineering, 2022
Abstract Formation damage can significantly defer hydrocarbon production. Formation damage is one of the key parameters used to evaluate the quality of various operations during the life of a well. The evolution of formation damage over time is rarely studied.
Sofiane Bellabiod, Abdelhakim Deghmoum, Abdelkader Aris, Ozgur Karacali   +3 more
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Thermodynamics Theory for Damage Evolution in Solids

2014
In 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, Nie, Shihua, Gomez, J., Gunel, Eray, Shidong Li, Minghui Lin, Hong Tang, Chengyong Yan, Wei Yao, Hua Ye   +9 more
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Gradient concepts for evolution of damage

Mechanics of Materials, 1999
Abstract While low-order measures of damage have sufficed to describe the stiffness of bodies with distributed voids or cracks, such as the void volume fraction or the crack density tensor of Vakulenko, A.A., Kachanov, M., 1971. [Inz. AN SSSR., Mekhanika Tverdogo Tela (Mech.
Thomas E. Lacy, David L. McDowell, Ramesh Talreja   +2 more
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Damage evolution in ductile materials: from micro- to macro-damage

Computational Mechanics, 1995
This 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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Damage evolution and damage model validation in spalled tantalum

Le Journal de Physique IV, 2000
The 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, A. K. Zurek, D. A.S. Macdougall, D. Tonks   +3 more
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On evolution laws of anisotropic damage

Engineering Fracture Mechanics, 1989
Abstract 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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Radiation damage evolution in ceramics

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2009
A 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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A statistical equation of damage evolution

Engineering Fracture Mechanics, 1995
Abstract 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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