TY - JOUR
T1 - Anisotropic damage mechanics based on strain energy equivalence and equivalent elliptical microcracks
AU - Lee, Usik
AU - Lesieutre, George A.
AU - Fang, Lei
N1 - Funding Information:
Acknowledgements-This work was supported by the Office of Naval Research under the "Integrated Predictive Diagnostics" MURI at Penn State University. Dr David Hall is the Principal Investigator, while Prof. Joseph Cusumano leads the "Failure Dynamics" sub-thrust. Their encouragement and advice is gratefully acknowledged.
PY - 1997
Y1 - 1997
N2 - A theory of damage mechanics is introduced based on a principle of strain energy equivalence. This principle is used to develop the effective continuum elastic properties of a damaged solid in terms of the undamaged elastic properties and a scalar damage field. The damage variable is defined as the volume fraction of a damage zone associated with equivalent elliptical microcracks. This definition provides a means by which a damaged isotropic material can exhibit anisotropic (orthotropic) properties, and entails determining effective crack orientation and geometry factors from the local deformation. Strain energy dissipation associated with crack growth (not nucleation) is used to develop a consistent damage evolution equation. This evolution equation is related to the standard power law model of crack growth commonly used in fracture mechanics, and to the equivalent stress measure commonly used in mechanics of plastic deformation. The combination of representing local damage as an effective elliptical crack volume fraction, a consistent damage evolution equation, and the determination of effective elastic properties using a strain energy equivalence principle yields a simple, yet powerful, approach to predicting failure of mechanical components.
AB - A theory of damage mechanics is introduced based on a principle of strain energy equivalence. This principle is used to develop the effective continuum elastic properties of a damaged solid in terms of the undamaged elastic properties and a scalar damage field. The damage variable is defined as the volume fraction of a damage zone associated with equivalent elliptical microcracks. This definition provides a means by which a damaged isotropic material can exhibit anisotropic (orthotropic) properties, and entails determining effective crack orientation and geometry factors from the local deformation. Strain energy dissipation associated with crack growth (not nucleation) is used to develop a consistent damage evolution equation. This evolution equation is related to the standard power law model of crack growth commonly used in fracture mechanics, and to the equivalent stress measure commonly used in mechanics of plastic deformation. The combination of representing local damage as an effective elliptical crack volume fraction, a consistent damage evolution equation, and the determination of effective elastic properties using a strain energy equivalence principle yields a simple, yet powerful, approach to predicting failure of mechanical components.
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U2 - 10.1016/S0020-7683(97)00022-X
DO - 10.1016/S0020-7683(97)00022-X
M3 - Article
AN - SCOPUS:0031280381
SN - 0020-7683
VL - 34
SP - 4377
EP - 4397
JO - International Journal of Solids and Structures
JF - International Journal of Solids and Structures
IS - 33-34
ER -