52 research outputs found
Novel microstructure quantification framework for databasing, visualization, and analysis of microstructure data
Reconstruction of three-dimensional anisotropic microstructures from two-dimensional micrographs imaged on orthogonal planes
Determination of the Appropriate Gradient Elasticity Theory for Bending Analysis of Nano-beams by Considering Boundary Conditions Effect
Modeling Crack Propagation in Polycrystalline Microstructure Using Variational Multiscale Method
Crack propagation in a polycrystalline microstructure is analyzed using a novel multiscale model. The model includes an explicit microstructural representation at critical regions (stress concentrators such as notches and cracks) and a reduced order model that statistically captures the microstructure at regions far away from stress concentrations. Crack propagation is modeled in these critical regions using the variational multiscale method. In this approach, a discontinuous displacement field is added to elements that exceed the critical values of normal or tangential tractions during loading. Compared to traditional cohesive zone modeling approaches, the method does not require the use of any special interface elements in the microstructure and thus can model arbitrary crack paths. The capability of the method in predicting both intergranular and transgranular failure modes in an elastoplastic polycrystal is demonstrated under tensile and three-point bending loads
Modeling the mechanics of HMX detonation using a Taylor–Galerkin scheme
Design of energetic materials is an exciting area in mechanics and materials science. Energetic composite materials are used as propellants, explosives, and fuel cell components. Energy release in these materials are accompanied by extreme events: shock waves travel at typical speeds of several thousand meters per second and the peak pressures can reach hundreds of gigapascals. In this paper, we develop a reactive dynamics code for modeling detonation wave features in one such material. The key contribution in this paper is an integrated algorithm to incorporate equations of state, Arrhenius kinetics, and mixing rules for particle detonation in a Taylor–Galerkin finite element simulation. We show that the scheme captures the distinct features of detonation waves, and the detonation velocity compares well with experiments reported in literature
Modeling of Shock Wave Propagation through Energetic Solid State Composites using a Taylor-Galerkin Scheme
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140573/1/6.2016-1172.pd
Optimization of Composite Plates with Spatially Varying Fiber Paths for Thermal Buckling
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140480/1/6.2015-0454.pd
Using synchrotron radiation to improve understanding of deformation of polycrystalline metals by measuring, modelling and publishing 4D information
- …