| Abstract Scope |
Mechanical properties are inherently multiscale, with macroscopic forces propagating down to atomic-scale organization and aggregation of defects, while mesoscale attributes mediate the process. Much of the challenge in predicting the mechanical response of materials relates to differentiating and understanding concurrent mechanisms. For example, metallic materials under cyclic deformation develop back stresses that significantly influence their mechanical response alongside other mechanisms.
Building on the microstructure-sensitive research legacy of McDowell, this talk will examine the origins of both intra- and intergranular back stresses, as well as thermal and athermal strengthening mechanisms. We will present strategies for isolating and characterizing these mechanisms, along with approaches for their accurate modeling. By integrating data from diverse loading conditions, we highlight methods for distinguishing the underlying physical processes. Finally, we will discuss the implications for multiscale crystal plasticity modeling, with an emphasis on the effective parameterization of these complex behaviors. |