2021-04-07 08:00:00
Sucrose is a commonly used energetic material simulant for đť›˝-HMX. However, its behavior under extreme loading conditions is not understood well. Pressure-Shear Plate Impact (PSPI) experiments have been conducted to provide an experimental foundation for developing a suitable constitutive model for sucrose. Experiments have…
In woven composite material, microscopic damage phenomena including fiber-matrix interface debonding, fiber breakage, and matrix fracture will subsequently result in macroscopic failure behaviors. Conventional detailed micromechanical models for predicting the effective composite material property are limited to microscale due to high computational cost. Continuum…
Newly developed reactive interatomic potential (ReaxFF) for the Mg/Al/Si/O is applied to operate a series of tensile molecular dynamics (MD) simulations for S-glass. Total 18 number of stress-strain simulations used strain rate from 1e7/s to 5e15/s to all-atom S-glass model. Both strength and modulus…
In fiber-reinforced composites, cracks initiate around the fibers aligned transversely to the loading direction. The transverse cracks can potentially cause leakage in specific applications or progress to inter-ply delamination and catastrophic failure. Initiated micro-cracks can go undetected since the instantaneous loss in the composites’…
Sizing emulsions are key in stabilization of glass fibers for use in the fiber-reinforced composites that continue to enjoy rapid growth in applications. To tailor composites with enhanced performance, it is necessary to understand the chemistries that determine sizing emulsion performance, including the epoxy…
Predicting the rate-dependent non-linear progressing damage behavior of unidirectional composites from the rate dependent properties of the constituents will enable computational materials-by-design and provide the fundamental understanding of the energy dissipating damage mechanisms. In this study, micromechanical finite element models of unidirectional glass-epoxy composites…
In a unidirectional polymer-matrix composite under axial tensile loading, the failure process is governed by the dynamic localization and clustering of multiple fiber breaks. The composite fails catastrophically once a critical cluster size (10-30 fiber breaks) is reached. The brittle failure of a fiber…
It is widely accepted that the fiber/matrix interface influences the overall mechanical properties and failure modes of fiber-reinforced composites. Fiber manufacturers use multifunctional sizing packages to lubricate, protect, and promote adhesion between the fiber and the matrix. These sizing packages contain a proprietary mixture…
Fracture is often simulated using the cohesive zone model (CZM), which requires a traction-separation law (TSL) to govern crack growth. Molecular dynamics (MD) simulations can be used to determine the TSL between two materials, but this TSL considers very small length scales and defect-free…
The properties of the glass fiber reinforced epoxy composites are greatly influenced by the interaction of the fiber with the epoxy matrix. This interaction is quantified using the interphase traction-separation response, called traction law. Recently, we have developed a molecular dynamics (MD) simulation protocol…
