0000000000858841

AUTHOR

Janis Varna

showing 3 related works from this author

Applicability Range of the One-Parameter Ply Plasticity Model for Prediction of the Nonlinear Response of Laminates

2005

A one-parameter lamina plasticity model is applied to predict the nonlinear deformation of an E-glass / epoxy cross-ply composite laminate under quasi-static uniaxial tensile loading at different angles to the material orthotropy axes. It is shown that the laminate theory yields accurate results within the plastic strain range covered in unidirectional continuous-fibre reinforced composite tests that are used to determine the plasticity model parameters.

Materials scienceComposite numberGlass epoxyUniaxial tensionEpoxyPlasticityPsychiatry and Mental healthNonlinear systemNeuropsychology and Physiological PsychologyNonlinear deformationvisual_artvisual_art.visual_art_mediumRange (statistics)Composite materialAdvanced Composites Letters
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Response of Cross-Ply Composite to Off-Axis Loading

2002

Polymer composites are known to exhibit nonlinear stress–strain response due to nonlinearly elastic or plastic deformation of the matrix and damage accumulation. Mechanistic modeling of material response explicitly accounting for these interacting factors often leads to complex theories. Plasticity theory formalism provides an alternative for nonlinear deformation description of composite material. We examine the applicability of an orthotropic plasticity model, developed by Sun et al. for unidirectionally reinforced composite, to composite laminate. The response of a symmetric and balanced cross-ply glass/epoxy laminate is studied under uniaxial tensile loading at different angles to the …

Materials scienceMechanical EngineeringComposite numberGlass fiberModulus02 engineering and technologyEpoxyPlasticity021001 nanoscience & nanotechnologyOrthotropic materialNonlinear system020303 mechanical engineering & transportsQuadratic equation0203 mechanical engineeringMechanics of Materialsvisual_artMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumComposite material0210 nano-technologyJournal of Composite Materials
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Mechanical properties of natural fiber composites produced using dynamic sheet former

2018

Composites formed from wood fibers and man-made cellulosic fibers in PLA (polylactic acid) matrix, manufactured using sheet forming technique and hot pressing, are studied. The composites have very low density (due to high porosity) and rather good elastic modulus and tensile strength. As expected, these properties for the four types of wood fiber composites studied here improve with increasing weight fraction of fibers, even if porosity is also increasing. On the contrary, for man-made cellulosic fiber composites with circular fiber cross-section, the increasing fiber weight fraction (accompanied by increasing void content) has detrimental effect on stiffness and strength. The differences …

0106 biological sciencesMaterials scienceflaxselluloosaHot pressing01 natural sciencesstiffnesschemistry.chemical_compoundMatrix (mathematics)joustavuusPolylactic acid010608 biotechnologyNaturvetenskapjäykkyysmedicineplaGeneral Materials ScienceviscoplasticityComposite materialdynamic sheet formerkomposiititNatural fiber040101 forestrywood fiber compositeskuiduttechnology industry and agricultureStiffness04 agricultural and veterinary sciencesnonlinear behaviorCellulose fiberchemistryPLA0401 agriculture forestry and fisheriestencel fibersmedicine.symptomNatural Sciencesstrengthlujuus
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