The Experts below are selected from a list of 163287 Experts worldwide ranked by ideXlab platform
John M Torkelson - One of the best experts on this subject based on the ideXlab platform.
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polyethylene starch blends with enhanced oxygen barrier and mechanical properties effect of granule morphology Damage by solid state shear pulverization
Polymer, 2007Co-Authors: Amanda M Walker, John M TorkelsonAbstract:A mechanical process called solid-state shear pulverization (SSSP) was used to create blends or composites of polyethylene (PE) and starch that resulted in Damaged granular structures. Because starch granules are unchanged when polymer/starch blends are made by melt mixing, this is the first time that Damage (Surface roughening, cracking, and clustering) to starch granule morphology has been reported in polymer/starch blends or composites. These morphological changes result in a 29% reduction in oxygen permeability for a 70/30 wt% PE/starch blend made by SSSP relative to neat PE; this compares with a 21% reduction in oxygen permeability when a similar blend is made by melt processing. In addition, relative to neat PE, the tensile modulus of a 70/30 wt% PE/starch blend is increased by 20% in the Damaged starch case (vs. 10% in the blend made by melt mixing) while the reduction in tensile strength is significantly smaller than that found in melt-mixed blends.
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polyethylene starch blends with enhanced oxygen barrier and mechanical properties effect of granule morphology Damage by solid state shear pulverization
Polymer, 2007Co-Authors: Amanda M Walker, Ying Tao, John M TorkelsonAbstract:A mechanical process called solid-state shear pulverization (SSSP) was used to create blends or composites of polyethylene (PE) and starch that resulted in Damaged granular structures. Because starch granules are unchanged when polymer/starch blends are made by melt mixing, this is the first time that Damage (Surface roughening, cracking, and clustering) to starch granule morphology has been reported in polymer/starch blends or composites. These morphological changes result in a 29% reduction in oxygen permeability for a 70/30 wt% PE/starch blend made by SSSP relative to neat PE; this compares with a 21% reduction in oxygen permeability when a similar blend is made by melt processing. In addition, relative to neat PE, the tensile modulus of a 70/30 wt% PE/starch blend is increased by 20% in the Damaged starch case (vs. 10% in the blend made by melt mixing) while the reduction in tensile strength is significantly smaller than that found in melt-mixed blends.
C. Furtado - One of the best experts on this subject based on the ideXlab platform.
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in situ synchrotron computed tomography study of nanoscale interlaminar reinforcement and thin ply effects on Damage progression in composite laminates
Composites Part B-engineering, 2021Co-Authors: Reed Kopp, C. Furtado, Jeonyoon Lee, Albertino Arteiro, G. Borstnar, Estelle Kalfoncohen, Mark MavrogordatoAbstract:Abstract In situ X-ray synchrotron radiation computed tomography (SRCT) of carbon fiber composite laminates reveals the first-ever qualitative and quantitative comparisons of 3D progressive Damage effects introduced by two mechanical enhancement technologies: aligned nanoscale fiber interlaminar reinforcement and thin-ply layers. The technologies were studied individually and in combination, using aerospace-grade unidirectional prepreg standard-thickness (‘std-ply’) and thin-ply composite laminates. The relatively weak interlaminar regions of the laminates were reinforced with high densities of aligned carbon nanotubes (A-CNTs) in a hierarchical architecture termed ‘nanostitching’. Quasi-isotropic double edge-notched tension (DENT) laminates were tested and simultaneously 3D-imaged via SRCT at various load steps, revealing a progressive 3D network of Damage micro-mechanisms that were segmented according to modality and extent. For load steps of 0%, 70%, 80%, and 90% of baseline ultimate tensile strength (UTS), intralaminar matrix cracking and fiber/matrix interfacial debonding are found to be the dominant Damage mechanisms, common to all laminate types. For both std-ply and thin-ply, nanostitched laminates had qualitatively and quantitatively similar matrix Damage modality and extent compared to the baseline laminates through 90% UTS, including relatively few delaminations, despite an ~9% increase in std-ply nanostitched UTS over the std-ply baseline. Complementary finite element-based modeling of Damage predicts greater delamination extent in std-ply vs. thin-ply laminates that manifests only between 90% and 100% UTS, offering an explanation for the observed positive nanostitch effect in the std-ply, which is known to be more susceptible to delamination formation and growth than the thin-ply laminates. Thin-ply, with and without nanostitch, intrinsically suppresses matrix Damage, as expected from past work and evidenced here by 6.5X less overall matrix Damage Surface area vs. std-ply baseline laminates averaged over all load steps. These findings contribute new insights from high-resolution experimental mapping of composite Damage states that can guide and inform mechanical enhancement approaches and improved Damage models.
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In situ synchrotron computed tomography study of nanoscale interlaminar reinforcement and thin-ply effects on Damage progression in composite laminates
Composites Part B: Engineering, 2021Co-Authors: Reed Kopp, Estelle Kalfon-cohen, C. Furtado, Jeonyoon Lee, Albertino Arteiro, G. Borstnar, Mark Mavrogordato, Lukas Helfen, Ian SinclairAbstract:Abstract In situ X-ray synchrotron radiation computed tomography (SRCT) of carbon fiber composite laminates reveals the first-ever qualitative and quantitative comparisons of 3D progressive Damage effects introduced by two mechanical enhancement technologies: aligned nanoscale fiber interlaminar reinforcement and thin-ply layers. The technologies were studied individually and in combination, using aerospace-grade unidirectional prepreg standard-thickness prepreg (‘std-ply’) and thin-ply composite laminates. The relatively weak interlaminar regions of the laminates were reinforced with high densities of aligned carbon nanotubes (A-CNTs) in a hierarchical architecture termed ‘nanostitching’. Quasi-isotropic double edge-notched tension (DENT) laminates were tested and simultaneously 3D-imaged via SRCT at various load steps, revealing a progressive 3D network of Damage micro-mechanisms that were segmented according to modality and extent. For load steps of 0%, 70%, 80%, and 90% of baseline ultimate tensile strength (UTS), intralaminar matrix cracking and fiber/matrix interfacial debonding are found to be the dominant Damage mechanisms, common to all laminate types. For both std-ply and thin-ply, nanostitched laminates had qualitatively and quantitatively similar matrix Damage modality and extent compared to the baseline laminates through 90% UTS, including relatively few delaminations, despite an ∼9% increase in std-ply nanostitched UTS over the std-ply baseline. Complementary finite element-based modeling of Damage predicts greater delamination extent in std-ply vs. thin-ply laminates that manifests only between 90% and 100% UTS, offering an explanation for the observed positive nanostitch effect in the std-ply, which is known to be more susceptible to delamination formation and growth than the thin-ply laminates. Thin-ply, with and without nanostitch, intrinsically suppresses matrix Damage, as expected from past work and evidenced here by 6.5X less overall matrix Damage Surface area vs. std-ply baseline laminates averaged over all load steps. These findings contribute new insights from high-resolution experimental mapping of composite Damage states that can guide and inform mechanical enhancement approaches and improved Damage models.
Amanda M Walker - One of the best experts on this subject based on the ideXlab platform.
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polyethylene starch blends with enhanced oxygen barrier and mechanical properties effect of granule morphology Damage by solid state shear pulverization
Polymer, 2007Co-Authors: Amanda M Walker, John M TorkelsonAbstract:A mechanical process called solid-state shear pulverization (SSSP) was used to create blends or composites of polyethylene (PE) and starch that resulted in Damaged granular structures. Because starch granules are unchanged when polymer/starch blends are made by melt mixing, this is the first time that Damage (Surface roughening, cracking, and clustering) to starch granule morphology has been reported in polymer/starch blends or composites. These morphological changes result in a 29% reduction in oxygen permeability for a 70/30 wt% PE/starch blend made by SSSP relative to neat PE; this compares with a 21% reduction in oxygen permeability when a similar blend is made by melt processing. In addition, relative to neat PE, the tensile modulus of a 70/30 wt% PE/starch blend is increased by 20% in the Damaged starch case (vs. 10% in the blend made by melt mixing) while the reduction in tensile strength is significantly smaller than that found in melt-mixed blends.
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polyethylene starch blends with enhanced oxygen barrier and mechanical properties effect of granule morphology Damage by solid state shear pulverization
Polymer, 2007Co-Authors: Amanda M Walker, Ying Tao, John M TorkelsonAbstract:A mechanical process called solid-state shear pulverization (SSSP) was used to create blends or composites of polyethylene (PE) and starch that resulted in Damaged granular structures. Because starch granules are unchanged when polymer/starch blends are made by melt mixing, this is the first time that Damage (Surface roughening, cracking, and clustering) to starch granule morphology has been reported in polymer/starch blends or composites. These morphological changes result in a 29% reduction in oxygen permeability for a 70/30 wt% PE/starch blend made by SSSP relative to neat PE; this compares with a 21% reduction in oxygen permeability when a similar blend is made by melt processing. In addition, relative to neat PE, the tensile modulus of a 70/30 wt% PE/starch blend is increased by 20% in the Damaged starch case (vs. 10% in the blend made by melt mixing) while the reduction in tensile strength is significantly smaller than that found in melt-mixed blends.
Mark Mavrogordato - One of the best experts on this subject based on the ideXlab platform.
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in situ synchrotron computed tomography study of nanoscale interlaminar reinforcement and thin ply effects on Damage progression in composite laminates
Composites Part B-engineering, 2021Co-Authors: Reed Kopp, C. Furtado, Jeonyoon Lee, Albertino Arteiro, G. Borstnar, Estelle Kalfoncohen, Mark MavrogordatoAbstract:Abstract In situ X-ray synchrotron radiation computed tomography (SRCT) of carbon fiber composite laminates reveals the first-ever qualitative and quantitative comparisons of 3D progressive Damage effects introduced by two mechanical enhancement technologies: aligned nanoscale fiber interlaminar reinforcement and thin-ply layers. The technologies were studied individually and in combination, using aerospace-grade unidirectional prepreg standard-thickness (‘std-ply’) and thin-ply composite laminates. The relatively weak interlaminar regions of the laminates were reinforced with high densities of aligned carbon nanotubes (A-CNTs) in a hierarchical architecture termed ‘nanostitching’. Quasi-isotropic double edge-notched tension (DENT) laminates were tested and simultaneously 3D-imaged via SRCT at various load steps, revealing a progressive 3D network of Damage micro-mechanisms that were segmented according to modality and extent. For load steps of 0%, 70%, 80%, and 90% of baseline ultimate tensile strength (UTS), intralaminar matrix cracking and fiber/matrix interfacial debonding are found to be the dominant Damage mechanisms, common to all laminate types. For both std-ply and thin-ply, nanostitched laminates had qualitatively and quantitatively similar matrix Damage modality and extent compared to the baseline laminates through 90% UTS, including relatively few delaminations, despite an ~9% increase in std-ply nanostitched UTS over the std-ply baseline. Complementary finite element-based modeling of Damage predicts greater delamination extent in std-ply vs. thin-ply laminates that manifests only between 90% and 100% UTS, offering an explanation for the observed positive nanostitch effect in the std-ply, which is known to be more susceptible to delamination formation and growth than the thin-ply laminates. Thin-ply, with and without nanostitch, intrinsically suppresses matrix Damage, as expected from past work and evidenced here by 6.5X less overall matrix Damage Surface area vs. std-ply baseline laminates averaged over all load steps. These findings contribute new insights from high-resolution experimental mapping of composite Damage states that can guide and inform mechanical enhancement approaches and improved Damage models.
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In situ synchrotron computed tomography study of nanoscale interlaminar reinforcement and thin-ply effects on Damage progression in composite laminates
Composites Part B: Engineering, 2021Co-Authors: Reed Kopp, Estelle Kalfon-cohen, C. Furtado, Jeonyoon Lee, Albertino Arteiro, G. Borstnar, Mark Mavrogordato, Lukas Helfen, Ian SinclairAbstract:Abstract In situ X-ray synchrotron radiation computed tomography (SRCT) of carbon fiber composite laminates reveals the first-ever qualitative and quantitative comparisons of 3D progressive Damage effects introduced by two mechanical enhancement technologies: aligned nanoscale fiber interlaminar reinforcement and thin-ply layers. The technologies were studied individually and in combination, using aerospace-grade unidirectional prepreg standard-thickness prepreg (‘std-ply’) and thin-ply composite laminates. The relatively weak interlaminar regions of the laminates were reinforced with high densities of aligned carbon nanotubes (A-CNTs) in a hierarchical architecture termed ‘nanostitching’. Quasi-isotropic double edge-notched tension (DENT) laminates were tested and simultaneously 3D-imaged via SRCT at various load steps, revealing a progressive 3D network of Damage micro-mechanisms that were segmented according to modality and extent. For load steps of 0%, 70%, 80%, and 90% of baseline ultimate tensile strength (UTS), intralaminar matrix cracking and fiber/matrix interfacial debonding are found to be the dominant Damage mechanisms, common to all laminate types. For both std-ply and thin-ply, nanostitched laminates had qualitatively and quantitatively similar matrix Damage modality and extent compared to the baseline laminates through 90% UTS, including relatively few delaminations, despite an ∼9% increase in std-ply nanostitched UTS over the std-ply baseline. Complementary finite element-based modeling of Damage predicts greater delamination extent in std-ply vs. thin-ply laminates that manifests only between 90% and 100% UTS, offering an explanation for the observed positive nanostitch effect in the std-ply, which is known to be more susceptible to delamination formation and growth than the thin-ply laminates. Thin-ply, with and without nanostitch, intrinsically suppresses matrix Damage, as expected from past work and evidenced here by 6.5X less overall matrix Damage Surface area vs. std-ply baseline laminates averaged over all load steps. These findings contribute new insights from high-resolution experimental mapping of composite Damage states that can guide and inform mechanical enhancement approaches and improved Damage models.
Albertino Arteiro - One of the best experts on this subject based on the ideXlab platform.
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in situ synchrotron computed tomography study of nanoscale interlaminar reinforcement and thin ply effects on Damage progression in composite laminates
Composites Part B-engineering, 2021Co-Authors: Reed Kopp, C. Furtado, Jeonyoon Lee, Albertino Arteiro, G. Borstnar, Estelle Kalfoncohen, Mark MavrogordatoAbstract:Abstract In situ X-ray synchrotron radiation computed tomography (SRCT) of carbon fiber composite laminates reveals the first-ever qualitative and quantitative comparisons of 3D progressive Damage effects introduced by two mechanical enhancement technologies: aligned nanoscale fiber interlaminar reinforcement and thin-ply layers. The technologies were studied individually and in combination, using aerospace-grade unidirectional prepreg standard-thickness (‘std-ply’) and thin-ply composite laminates. The relatively weak interlaminar regions of the laminates were reinforced with high densities of aligned carbon nanotubes (A-CNTs) in a hierarchical architecture termed ‘nanostitching’. Quasi-isotropic double edge-notched tension (DENT) laminates were tested and simultaneously 3D-imaged via SRCT at various load steps, revealing a progressive 3D network of Damage micro-mechanisms that were segmented according to modality and extent. For load steps of 0%, 70%, 80%, and 90% of baseline ultimate tensile strength (UTS), intralaminar matrix cracking and fiber/matrix interfacial debonding are found to be the dominant Damage mechanisms, common to all laminate types. For both std-ply and thin-ply, nanostitched laminates had qualitatively and quantitatively similar matrix Damage modality and extent compared to the baseline laminates through 90% UTS, including relatively few delaminations, despite an ~9% increase in std-ply nanostitched UTS over the std-ply baseline. Complementary finite element-based modeling of Damage predicts greater delamination extent in std-ply vs. thin-ply laminates that manifests only between 90% and 100% UTS, offering an explanation for the observed positive nanostitch effect in the std-ply, which is known to be more susceptible to delamination formation and growth than the thin-ply laminates. Thin-ply, with and without nanostitch, intrinsically suppresses matrix Damage, as expected from past work and evidenced here by 6.5X less overall matrix Damage Surface area vs. std-ply baseline laminates averaged over all load steps. These findings contribute new insights from high-resolution experimental mapping of composite Damage states that can guide and inform mechanical enhancement approaches and improved Damage models.
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In situ synchrotron computed tomography study of nanoscale interlaminar reinforcement and thin-ply effects on Damage progression in composite laminates
Composites Part B: Engineering, 2021Co-Authors: Reed Kopp, Estelle Kalfon-cohen, C. Furtado, Jeonyoon Lee, Albertino Arteiro, G. Borstnar, Mark Mavrogordato, Lukas Helfen, Ian SinclairAbstract:Abstract In situ X-ray synchrotron radiation computed tomography (SRCT) of carbon fiber composite laminates reveals the first-ever qualitative and quantitative comparisons of 3D progressive Damage effects introduced by two mechanical enhancement technologies: aligned nanoscale fiber interlaminar reinforcement and thin-ply layers. The technologies were studied individually and in combination, using aerospace-grade unidirectional prepreg standard-thickness prepreg (‘std-ply’) and thin-ply composite laminates. The relatively weak interlaminar regions of the laminates were reinforced with high densities of aligned carbon nanotubes (A-CNTs) in a hierarchical architecture termed ‘nanostitching’. Quasi-isotropic double edge-notched tension (DENT) laminates were tested and simultaneously 3D-imaged via SRCT at various load steps, revealing a progressive 3D network of Damage micro-mechanisms that were segmented according to modality and extent. For load steps of 0%, 70%, 80%, and 90% of baseline ultimate tensile strength (UTS), intralaminar matrix cracking and fiber/matrix interfacial debonding are found to be the dominant Damage mechanisms, common to all laminate types. For both std-ply and thin-ply, nanostitched laminates had qualitatively and quantitatively similar matrix Damage modality and extent compared to the baseline laminates through 90% UTS, including relatively few delaminations, despite an ∼9% increase in std-ply nanostitched UTS over the std-ply baseline. Complementary finite element-based modeling of Damage predicts greater delamination extent in std-ply vs. thin-ply laminates that manifests only between 90% and 100% UTS, offering an explanation for the observed positive nanostitch effect in the std-ply, which is known to be more susceptible to delamination formation and growth than the thin-ply laminates. Thin-ply, with and without nanostitch, intrinsically suppresses matrix Damage, as expected from past work and evidenced here by 6.5X less overall matrix Damage Surface area vs. std-ply baseline laminates averaged over all load steps. These findings contribute new insights from high-resolution experimental mapping of composite Damage states that can guide and inform mechanical enhancement approaches and improved Damage models.
