Catalin R. Picu
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View article: Length scale and grid resolution effects in the simulation of shear and energy localization during pore collapse in shocked energetic crystals
Length scale and grid resolution effects in the simulation of shear and energy localization during pore collapse in shocked energetic crystals Open
Previous works [Herrin et al., J. Appl. Phys. 136(13), 135901 (2024), Nguyen et al., J. Appl. Phys. 136(11), 114902 (2024)] obtained atomistics-consistent material models for two common energetic crystals, HMX (1,3,5,7-Tetranitro-1,3,5,7-t…
View article: Quantitative analysis of shear band formation around collapsing pores in shocked energetic organic crystals
Quantitative analysis of shear band formation around collapsing pores in shocked energetic organic crystals Open
Shear bands can play a significant role in energy localization in energetic crystals loaded under the high-pressure, high strain-rate conditions of shock waves. While the origin and growth of shear bands have been well studied and visualiz…
View article: Transition Behavior of Cellulose Nanocrystal Networks Induced by Nanoconfined Water
Transition Behavior of Cellulose Nanocrystal Networks Induced by Nanoconfined Water Open
Hydrogen bonding (HB) is essential for the mechanical properties of cellulose‐based materials. However, the plastification of cellulose nanocrystals (CNC) caused by the transition of HB in the presence of water is still insufficiently unde…
View article: Epitaxial Layer in Bone Mineral is Regulated by the Organic Matrix
Epitaxial Layer in Bone Mineral is Regulated by the Organic Matrix Open
View article: On resolving meso-scale calculations of pore-collapse-generated hotspots in energetic crystals for consistency with atomistic models
On resolving meso-scale calculations of pore-collapse-generated hotspots in energetic crystals for consistency with atomistic models Open
Meso-scale calculations of pore collapse and hotspot formation in energetic crystals provide closure models to macro-scale hydrocodes for predicting the shock sensitivity of energetic materials. To this end, previous works obtained atomist…
View article: Effect of thermomechanical processing on mechanical properties and the microstructure of binary Al-Ce alloy
Effect of thermomechanical processing on mechanical properties and the microstructure of binary Al-Ce alloy Open
View article: Pore collapse, shear bands, and hotspots using atomistics-consistent continuum models for RDX (1,3,5-trinitro-1,3,5-triazinane): Comparison with molecular dynamics calculations
Pore collapse, shear bands, and hotspots using atomistics-consistent continuum models for RDX (1,3,5-trinitro-1,3,5-triazinane): Comparison with molecular dynamics calculations Open
Shock-induced energy localization is a crucial mechanism for determining shock sensitivity of energetic materials (EMs). Hotspots, i.e., localized areas of elevated temperature, arise when shocks interact with defects (cracks, pores, and i…
View article: Atomistics-consistent continuum models and pore-collapse-generated hotspot temperatures in energetic crystals I: beta-1,3,5,7-tetranitro-1,3,5,7-tetrazocane (beta-HMX)
Atomistics-consistent continuum models and pore-collapse-generated hotspot temperatures in energetic crystals I: beta-1,3,5,7-tetranitro-1,3,5,7-tetrazocane (beta-HMX) Open
Hotspot formation due to pore collapse is a key mechanism for initiating detonation of shocked energetic materials. Energy localization at and around the pore collapse site leads to high-temperature hotspots, initiating chemical reactions.…
View article: Johnson–Cook yield functions for cyclotetramethylene-tetranitramine (HMX) and cyclotrimethylene-trinitramine (RDX) derived from single crystal plasticity models
Johnson–Cook yield functions for cyclotetramethylene-tetranitramine (HMX) and cyclotrimethylene-trinitramine (RDX) derived from single crystal plasticity models Open
High-fidelity constitutive models are critical for accurate meso-scale continuum modeling and prediction of shock initiation of crystalline energetic materials (EMs). While empirically calibrated or atomistic-guided anisotropic elastoplast…
View article: Methodological Aspects and Mesh Convergence in Numerical Analysis of Athermal Fiber Network Material Deformation
Methodological Aspects and Mesh Convergence in Numerical Analysis of Athermal Fiber Network Material Deformation Open
A balance between model complexity, accuracy, and computational cost is a central concern in numerical simulations. In particular, for stochastic fiber networks, the non-affine deformation of fibers, related non-linear geometric features d…
View article: Transition Behavior of Cellulose Nanocrystal Networks Induced by Nanoconfined Water
Transition Behavior of Cellulose Nanocrystal Networks Induced by Nanoconfined Water Open
View article: A new open source framework for multiscale modeling of fibrous materials on heterogeneous supercomputers
A new open source framework for multiscale modeling of fibrous materials on heterogeneous supercomputers Open
This article presents MuMFiM, an open source application for multiscale modeling of fibrous materials on massively parallel computers. MuMFiM uses two scales to represent fibrous materials such as biological network materials (extracellula…
View article: Toughness of network materials: Structural parameters controlling damage accumulation
Toughness of network materials: Structural parameters controlling damage accumulation Open
View article: Thermomechanical analysis (TMA) of vitrimers
Thermomechanical analysis (TMA) of vitrimers Open
Vitrimers are an exciting class and new generation of polymer materials combining the strength of a traditional thermoset polymer with the reprocessability of a traditional thermoplastic polymer. However, a key debate in literature has sur…
View article: Recyclability of Vitrimer Materials: Impact of Catalyst and Processing Conditions
Recyclability of Vitrimer Materials: Impact of Catalyst and Processing Conditions Open
With sustainability at the forefront of material research, recyclable polymers, such as vitrimers, have garnered increasing attention since their introduction in 2011. In addition to a traditional glass-transition temperature (T
View article: Probing soft fibrous materials by indentation
Probing soft fibrous materials by indentation Open
View article: Random Fiber Network Loaded by a Point Force
Random Fiber Network Loaded by a Point Force Open
This article presents the displacement field produced by a point force acting on an athermal random fiber network (the Green function for the network). The problem is defined within the limits of linear elasticity, and the field is obtaine…
View article: Atomistic-to-Continuum Coupling Methods Based on Domain Decomposition.
Atomistic-to-Continuum Coupling Methods Based on Domain Decomposition. Open
View article: Strength of stochastic fibrous materials under multiaxial loading
Strength of stochastic fibrous materials under multiaxial loading Open
Numerical models are used to investigate the strength of stochastic fiber networks subjected to multiaxial loading. A relation linking network structural parameters with the multiaxial strength is developed.
View article: Size effects in random fiber networks controlled by the use of generalized boundary conditions
Size effects in random fiber networks controlled by the use of generalized boundary conditions Open
View article: Tensile behavior of non-crosslinked networks of athermal fibers in the presence of entanglements and friction
Tensile behavior of non-crosslinked networks of athermal fibers in the presence of entanglements and friction Open
A geometric definition of entanglements in athermal random networks is proposed and is linked to the network stiffness. Entanglements produce a self-equilibrated stress which increases the stiffness.
View article: Heterogeneity-Induced Mesoscale Toughening in Polymer Nanocomposites
Heterogeneity-Induced Mesoscale Toughening in Polymer Nanocomposites Open
View article: List of Authors
List of Authors Open
View article: Index
Index Open
View article: Mechanical behavior of cellular networks of fiber bundles stabilized by adhesion
Mechanical behavior of cellular networks of fiber bundles stabilized by adhesion Open
View article: Erratum: “Random Fiber Networks With Superior Properties Through Network Topology Control” [ASME J. Appl. Mech., 2019, 86(8), p. 081010; DOI: 10.1115/1.4043828]
Erratum: “Random Fiber Networks With Superior Properties Through Network Topology Control” [ASME J. Appl. Mech., 2019, 86(8), p. 081010; DOI: 10.1115/1.4043828] Open
View article: Random Fiber Networks With Superior Properties Through Network Topology Control
Random Fiber Networks With Superior Properties Through Network Topology Control Open
In this work, we study the effect of network architecture on the nonlinear elastic behavior and strength of athermal random fiber networks of cellular type. We introduce a topology modification of Poisson–Voronoi (PV) networks with convex …
View article: Parameters controlling the strength of stochastic fibrous materials
Parameters controlling the strength of stochastic fibrous materials Open
View article: Stochastic continuum model for mycelium-based bio-foam
Stochastic continuum model for mycelium-based bio-foam Open
Effect of Network Architecture on the Mechanical Behavior of Random Fiber Networks Open