Lattice Discrete Particle Model
LDPM is a novel analytical approach for modeling the response of heterogeneous and granular materials, such as composite laminates, ceramics, concrete, gravels, and soils. The premise of the LDPM formulation is that most materials are not homogenous when considered at a sufficiently small dimensional scale (micro- and meso-scale). This heterogeneous character has a paramount relevance for the description of strain localization, crack initiation, and crack propagation, which, in turn, strongly influence the ultimate failure mode of a structural system. Continuum-based models, which homogenize material behavior, are inherently incapable of capturing the mesoscale interactions and as such become complex and inadequate in the failure range.
Unconfined compression test
A prism specimen of concrete is placed between two rigid platens. Unconfined compression test is simulated to capture the failure modes in two different situations: high/low friction between specimen and platens. Different failure modes are expected as follows.