Constitutive Modeling and Computational Mechanics of Dynamic Response and Fracture of Metallic and Non-Metallic Material.
Final rept. 15 Mar 89-14 Jan 91,
GEORGIA INST OF TECH ATLANTA
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Finite element analysis of static and dynamic fracture of brittle microcracking solids was performed. The continuum constitutive modeling for rate-dependent fracture of brittle microcracking solids is discussed. The rate-type constitutive equation that is proposed takes into account the rate effect on microcracking and plastic deformation. In order to test the validity of the proposed modeling, numerical studies were conducted on a bar under uniaxial tension, a beam under pure bending, and on the phenomenon of microcracking around the tip of a macrocrack under mode-I loading. Finite element analysis of stationary and rapidly-propagating macrocracks under dynamic loading. The microcrack toughening effect is discussed, along with the influence on it of the size of the microcracked process zone and the various parameters in the microcrack density evolution equation, through the observation of the behavior of the general crack-tip energy-release parameter, the T integral. Some important aspects associated with the transformation induced plasticity in Al2O2ZrO2 are analyzed using a computer simulation based on Finite Element Method. MM
- Properties of Metals and Alloys