... 34 Characterization of Lamina and Interlaminar Damage in Graphite/ Epoxy Composites by the De... more ... 34 Characterization of Lamina and Interlaminar Damage in Graphite/ Epoxy Composites by the Deply TechniqueSM FREEMAN 50 MATERIAL ... AND JOHN FRUIT 73 Hybrid-Fiber-Reinforced Sheet Molding Compound Composite DC CHANG 85 In-Plane Behavior of a ...
A constitutive model for fibrous polymer composites was established based on an elastic—plastic a... more A constitutive model for fibrous polymer composites was established based on an elastic—plastic approach. The proposed potential function is a linear combination of functions related to deviatoric and dilatational deformations. A unidirectional carbon/epoxy composite, AS4/3501-6, and a woven-glass/vinylester composite were fabricated and tested under quasi-static off-axis tension and compression and used in developing and verifying the model. Model parameters were
ABSTRACT--Strain distributions to failure, tensile and compressive strain-concentration factors, ... more ABSTRACT--Strain distributions to failure, tensile and compressive strain-concentration factors, and strength-reduc-tion factors were determined for glass-, boron-, and graphite-epoxy plates with holes loaded in tension. Strain gages, photoelastic coatings and moir6 ...
The isochromatic and isopachic fringes are obtained holographically in the neighborhood of a cent... more The isochromatic and isopachic fringes are obtained holographically in the neighborhood of a central crack in a tensile, orthotropic glass-composite plate. The general inability to separate the principal stresses or strains from such information alone under anisotropic conditions is discussed, as are the results relative to fracture-mechanics implications.
The objective of this study was to characterize the quasi-static and dynamic behavior of composit... more The objective of this study was to characterize the quasi-static and dynamic behavior of composite materials and develop/expand failure theories to describe static and dynamic failure under multi-axial states of stress. A unidirectional carbon/epoxy material was investigated. Multi-axial experiments were conducted at three strain rates, quasi-static, intermediate and high, 10−4, 1 and 180–400s−1, respectively, using off-axis specimens to produce stress
Unidirectional and textile carbon/epoxy composites were characterized under multi-axial states of... more Unidirectional and textile carbon/epoxy composites were characterized under multi-axial states of stress. In-plane and through-thickness tensile, compressive, and shear tests were conducted at various orientations with the principal material axes. The stress–strain behavior, failure modes, and strengths were recorded. Results were compared with three types of failure criteria in three dimensions, limit criteria (maximum stress), fully interactive criteria (Tsai-Hill, Tsai-Wu),
Clay/epoxy nanocomposites with concentrations of 110 wt.% of clay particles were prepared by she... more Clay/epoxy nanocomposites with concentrations of 110 wt.% of clay particles were prepared by shear mixing. The mechanical and viscoelastic behavior of nanocomposites was investigated using a servohydraulic testing machine and a dynamic mechanical analyzer, respectively. ...
Polymer/clay nanocomposites consisting of epoxy matrix filled with silicate clay particles were i... more Polymer/clay nanocomposites consisting of epoxy matrix filled with silicate clay particles were investigated. These particles consist of 1 nm thick platelets or layers with an aspect ratio in the range of 100–1000. Recent and ongoing research has shown that dramatic enhancements can be achieved in stiffness and thermal properties in these nanocomposites with small amounts of particle concentration. The resulting
... 34 Characterization of Lamina and Interlaminar Damage in Graphite/ Epoxy Composites by the De... more ... 34 Characterization of Lamina and Interlaminar Damage in Graphite/ Epoxy Composites by the Deply TechniqueSM FREEMAN 50 MATERIAL ... AND JOHN FRUIT 73 Hybrid-Fiber-Reinforced Sheet Molding Compound Composite DC CHANG 85 In-Plane Behavior of a ...
A constitutive model for fibrous polymer composites was established based on an elastic—plastic a... more A constitutive model for fibrous polymer composites was established based on an elastic—plastic approach. The proposed potential function is a linear combination of functions related to deviatoric and dilatational deformations. A unidirectional carbon/epoxy composite, AS4/3501-6, and a woven-glass/vinylester composite were fabricated and tested under quasi-static off-axis tension and compression and used in developing and verifying the model. Model parameters were
ABSTRACT--Strain distributions to failure, tensile and compressive strain-concentration factors, ... more ABSTRACT--Strain distributions to failure, tensile and compressive strain-concentration factors, and strength-reduc-tion factors were determined for glass-, boron-, and graphite-epoxy plates with holes loaded in tension. Strain gages, photoelastic coatings and moir6 ...
The isochromatic and isopachic fringes are obtained holographically in the neighborhood of a cent... more The isochromatic and isopachic fringes are obtained holographically in the neighborhood of a central crack in a tensile, orthotropic glass-composite plate. The general inability to separate the principal stresses or strains from such information alone under anisotropic conditions is discussed, as are the results relative to fracture-mechanics implications.
The objective of this study was to characterize the quasi-static and dynamic behavior of composit... more The objective of this study was to characterize the quasi-static and dynamic behavior of composite materials and develop/expand failure theories to describe static and dynamic failure under multi-axial states of stress. A unidirectional carbon/epoxy material was investigated. Multi-axial experiments were conducted at three strain rates, quasi-static, intermediate and high, 10−4, 1 and 180–400s−1, respectively, using off-axis specimens to produce stress
Unidirectional and textile carbon/epoxy composites were characterized under multi-axial states of... more Unidirectional and textile carbon/epoxy composites were characterized under multi-axial states of stress. In-plane and through-thickness tensile, compressive, and shear tests were conducted at various orientations with the principal material axes. The stress–strain behavior, failure modes, and strengths were recorded. Results were compared with three types of failure criteria in three dimensions, limit criteria (maximum stress), fully interactive criteria (Tsai-Hill, Tsai-Wu),
Clay/epoxy nanocomposites with concentrations of 110 wt.% of clay particles were prepared by she... more Clay/epoxy nanocomposites with concentrations of 110 wt.% of clay particles were prepared by shear mixing. The mechanical and viscoelastic behavior of nanocomposites was investigated using a servohydraulic testing machine and a dynamic mechanical analyzer, respectively. ...
Polymer/clay nanocomposites consisting of epoxy matrix filled with silicate clay particles were i... more Polymer/clay nanocomposites consisting of epoxy matrix filled with silicate clay particles were investigated. These particles consist of 1 nm thick platelets or layers with an aspect ratio in the range of 100–1000. Recent and ongoing research has shown that dramatic enhancements can be achieved in stiffness and thermal properties in these nanocomposites with small amounts of particle concentration. The resulting
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Papers by Isaac M Daniel