Dissipative potentials for anisotropic heterogeneous media
Abstract
The U.S. Air Force makes use of a large array of materials, many of which are quite ductile and may exhibit directional dependence of their properties. Moreover, certain metal forming operations used on components impart a significant amount of plasticity that results in material damage. The accumulation of damage during forming of these components, and the subsequent evolution of damage during service could be prevented only if predictive capabilities are available. While many efforts have been devoted to this topic, thus fostering the misconception that potential failures are all predictable, this is not the case. At present, for anisotropic materials, the evolution laws for damage are expressed in terms of isotropic measures of stress (e.g. stress triaxiality, Lode angle), which means that the damage directionality induced by the intrinsic symmetries of the respective material is not described. Open questions related to the combined effects of the material anisotropy and loading history on damage evolution need to be elucidated. Indeed, ductile models that account for the plastic anisotropy of the matrix (void free material) are scarce. However, in these models, it is assumed that the matrix inelastic behavior is governed by quadratic yield functions. Moreover, due to simplifying assumptions made in the derivation of the dissipative plastic potential for the void-matrix aggregate, in these formulations pressure and deviatoric (shear) stresses are decoupled.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 21, 2022
- Source ID
- FA95502110346XX0
Entities
People
- Oana Cazacu
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Florida