Characterization of Impact in Composite Laminates

Minnaar, Karel; Zhou, Min

doi:10.1063/1.1483755

Cited by 6 publications

(2 citation statements)

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“…In this study, a cohesive finite element method (CFEM)-based framework is developed and used, accounting for microstructure and the thermal-mechanical processes outlined above. Such a framework has been extensively used to study a wide variety of issues related to delamination and fracture such as tensile decohesion [25], quasi-static crack growth [26], ductile fracture [27,28], dynamic fracture [29], dynamic fragmentation [30,31], delamination in composites [32,33] and microstructural fracture [34]. Here, cohesive elements are embedded throughout the microstructure, along all elements boundaries, as in [34].…”

Section: Introductionmentioning

confidence: 99%

A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives

Barua¹,

Zhou²

2011

Modelling Simul. Mater. Sci. Eng.

140

102

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A cohesive finite element method (CFEM) framework for quantifying the thermomechanical response of polymer-bonded explosives (PBXs) at the microstructural level is developed. The analysis carried out concerns the impact loading of HMX/Estane at strain rates on the order of 104–105 s−1. Issues studied include large deformation, thermomechanical coupling, failure in the forms of microcracks in both bulk constituents and along grain/matrix interfaces, and frictional heating. The polymer matrix is described by a thermo-elasto-viscoelastic constitutive formulation, accounting for temperature dependence, strain rate sensitivity and strain hardening. The HMX crystals are assumed to be elastic. The CFEM framework allows the contributions of individual constituents, fracture and frictional contact along failed crack surfaces to heating to be tracked and analyzed. Digitized micrographs of actual PBX materials and idealized microstructures with Gaussian distributions of grain sizes are used in the analysis. The formation of local hot spots as potential ignition sites is primarily due to the viscoelastic dissipation in the matrix in early stages of deformation and frictional heating along crack surfaces in later stages of deformation. The framework is a useful tool for the design of energetic composites and the results can be used to establish microstructure–response relations that can be used to assess the performance of energetic composites.

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Section: Introductionmentioning

confidence: 99%

A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives

Barua¹,

Zhou²

2011

Modelling Simul. Mater. Sci. Eng.

140

102

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“…If the bond between the facesheet and the core is strong, tensile fracture in the foam leads 13 to separation. Some commonly used metrics to evaluate the damage resistance of composites to impact loads are impact energy, displacement, delamination-area and extent of rupture.The cohesive finite element method (CFEM) has been extensively used to study a wide variety of issues related to delamination and fracture such as tensile decohesion (Needleman[39]), quasi-static crack growth (Tvergaard and Hutchinson[40]), ductile fracture(Tvergaard and Needleman[41,42]), dynamic fracture (Xu and Needleman[43]), dynamic fragmentation (Camacho and Ortiz[44], Espinosa et al[45]), delamination in composites (Camanho et al[46], Minnaar and Zhou[47]) and microstructural fracture (Zhai and Zhou[48]). Here, cohesive elements are specified at the interfaces between individual laminas in the composite structure as well as the interfaces between the aluminum and composite sections in the hybrid plates.…”

mentioning

confidence: 99%

Novel experimental and 3D multiphysics computational framework for analyzing deformation and failure of composite laminates subjected to water blasts

Avachat

Zhou

2017

International Journal of Impact Engineering

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The load-carrying capacity of composite structures under water-based impulsive loads is studied in relation to different materials and loading conditions. The analysis focuses on the role of fiber orientation, fiber stiffness and angle of structure obliquity relative to load direction on the deformation and failure in monolithic carbon-fiber and glass-fiber/epoxy composite plates of similar mass and thickness. Structures are subjected to impulsive loads of different intensities generated using the Underwater Shock Loading Simulator (USLS), a novel projectile-impactbased impulsive loading facility. In-situ high-speed digital imaging is used to study the deformation and failure, focusing on the effects of load intensity, failure modes and material heterogeneity. The experiments are combined with fully dynamic 3D Coupled Eulerian Lagrangian (CEL) finite element simulations accounting for the effects of fluid-structure interactions (FSI) and in-ply and inter-ply cracking and failure. It is found that the carbon-fiber laminates provide higher blast resistance, but transmit a greater fraction of the incident impulse to the supports than the glass-fiber laminates. Damage through in-ply and inter-ply cracking in the carbon-fiber laminates is ~25% of that in the glass-fiber laminates. Higher angles of load

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Geometry and Size Effects in Response of Composite Structures Subjected to Water-Based Impulsive Loading

Avachat¹,

Qu²,

Zhou³

2017

Blast Mitigation Strategies in Marine Composite and Sandwich Structures

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Characterization of Impact in Composite Laminates

Cited by 6 publications

References 0 publications

A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives

A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives

Novel experimental and 3D multiphysics computational framework for analyzing deformation and failure of composite laminates subjected to water blasts

Geometry and Size Effects in Response of Composite Structures Subjected to Water-Based Impulsive Loading

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