The Experts below are selected from a list of 87 Experts worldwide ranked by ideXlab platform
Stephen M. Shaler - One of the best experts on this subject based on the ideXlab platform.
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dynamic mechanical thermal analysis dmta of cellulose nanofibril nanoclay pmdi nanocomposites
Composites Part B-engineering, 2016Co-Authors: Zeki Candan, Douglas J. Gardner, Stephen M. ShalerAbstract:Abstract Cellulose nanofibrils and montmorillonite nanoclay were used to reinforce polymethylene diphenyl diisocyanate (pMDI) resin at loading levels ranging from 1 to 5%. Laminate sandwich samples were prepared using nano-reinforced resin and Wood strands. The Laminate samples were analyzed for viscoelastic properties using dynamic mechanical thermal analysis (DMTA). Results obtained in this study showed that storage modulus, final cure temperature, and storage modulus at final cure of the pMDI resin were affected by nanoparticle reinforcement. The highest storage modulus was obtained for the 1% cellulose nanofibril reinforced pMDI-Wood Laminate sample. It was found that the neat pMDI resin had a slightly higher (max %3.82) final cure temperature compared with the pMDI resin reinforced with cellulose nanofibril or nanoclay at different loading levels.
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Dynamic mechanical thermal analysis (DMTA) of cellulose nanofibril/nanoclay/pMDI nanocomposites
Composites Part B: Engineering, 2016Co-Authors: Zeki Candan, Douglas J. Gardner, Stephen M. ShalerAbstract:Cellulose nanofibrils and montmorillonite nanoclay were used to reinforce polymethylene diphenyl diisocyanate (pMDI) resin at loading levels ranging from 1 to 5%. Laminate sandwich samples were prepared using nano-reinforced resin and Wood strands. The Laminate samples were analyzed for viscoelastic properties using dynamic mechanical thermal analysis (DMTA). Results obtained in this study showed that storage modulus, final cure temperature, and storage modulus at final cure of the pMDI resin were affected by nanoparticle reinforcement. The highest storage modulus was obtained for the 1% cellulose nanofibril reinforced pMDI-Wood Laminate sample. It was found that the neat pMDI resin had a slightly higher (max %3.82) final cure temperature compared with the pMDI resin reinforced with cellulose nanofibril or nanoclay at different loading levels.
Zeki Candan - One of the best experts on this subject based on the ideXlab platform.
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dynamic mechanical thermal analysis dmta of cellulose nanofibril nanoclay pmdi nanocomposites
Composites Part B-engineering, 2016Co-Authors: Zeki Candan, Douglas J. Gardner, Stephen M. ShalerAbstract:Abstract Cellulose nanofibrils and montmorillonite nanoclay were used to reinforce polymethylene diphenyl diisocyanate (pMDI) resin at loading levels ranging from 1 to 5%. Laminate sandwich samples were prepared using nano-reinforced resin and Wood strands. The Laminate samples were analyzed for viscoelastic properties using dynamic mechanical thermal analysis (DMTA). Results obtained in this study showed that storage modulus, final cure temperature, and storage modulus at final cure of the pMDI resin were affected by nanoparticle reinforcement. The highest storage modulus was obtained for the 1% cellulose nanofibril reinforced pMDI-Wood Laminate sample. It was found that the neat pMDI resin had a slightly higher (max %3.82) final cure temperature compared with the pMDI resin reinforced with cellulose nanofibril or nanoclay at different loading levels.
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Dynamic mechanical thermal analysis (DMTA) of cellulose nanofibril/nanoclay/pMDI nanocomposites
Composites Part B: Engineering, 2016Co-Authors: Zeki Candan, Douglas J. Gardner, Stephen M. ShalerAbstract:Cellulose nanofibrils and montmorillonite nanoclay were used to reinforce polymethylene diphenyl diisocyanate (pMDI) resin at loading levels ranging from 1 to 5%. Laminate sandwich samples were prepared using nano-reinforced resin and Wood strands. The Laminate samples were analyzed for viscoelastic properties using dynamic mechanical thermal analysis (DMTA). Results obtained in this study showed that storage modulus, final cure temperature, and storage modulus at final cure of the pMDI resin were affected by nanoparticle reinforcement. The highest storage modulus was obtained for the 1% cellulose nanofibril reinforced pMDI-Wood Laminate sample. It was found that the neat pMDI resin had a slightly higher (max %3.82) final cure temperature compared with the pMDI resin reinforced with cellulose nanofibril or nanoclay at different loading levels.
Douglas J. Gardner - One of the best experts on this subject based on the ideXlab platform.
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dynamic mechanical thermal analysis dmta of cellulose nanofibril nanoclay pmdi nanocomposites
Composites Part B-engineering, 2016Co-Authors: Zeki Candan, Douglas J. Gardner, Stephen M. ShalerAbstract:Abstract Cellulose nanofibrils and montmorillonite nanoclay were used to reinforce polymethylene diphenyl diisocyanate (pMDI) resin at loading levels ranging from 1 to 5%. Laminate sandwich samples were prepared using nano-reinforced resin and Wood strands. The Laminate samples were analyzed for viscoelastic properties using dynamic mechanical thermal analysis (DMTA). Results obtained in this study showed that storage modulus, final cure temperature, and storage modulus at final cure of the pMDI resin were affected by nanoparticle reinforcement. The highest storage modulus was obtained for the 1% cellulose nanofibril reinforced pMDI-Wood Laminate sample. It was found that the neat pMDI resin had a slightly higher (max %3.82) final cure temperature compared with the pMDI resin reinforced with cellulose nanofibril or nanoclay at different loading levels.
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Dynamic mechanical thermal analysis (DMTA) of cellulose nanofibril/nanoclay/pMDI nanocomposites
Composites Part B: Engineering, 2016Co-Authors: Zeki Candan, Douglas J. Gardner, Stephen M. ShalerAbstract:Cellulose nanofibrils and montmorillonite nanoclay were used to reinforce polymethylene diphenyl diisocyanate (pMDI) resin at loading levels ranging from 1 to 5%. Laminate sandwich samples were prepared using nano-reinforced resin and Wood strands. The Laminate samples were analyzed for viscoelastic properties using dynamic mechanical thermal analysis (DMTA). Results obtained in this study showed that storage modulus, final cure temperature, and storage modulus at final cure of the pMDI resin were affected by nanoparticle reinforcement. The highest storage modulus was obtained for the 1% cellulose nanofibril reinforced pMDI-Wood Laminate sample. It was found that the neat pMDI resin had a slightly higher (max %3.82) final cure temperature compared with the pMDI resin reinforced with cellulose nanofibril or nanoclay at different loading levels.
Joan B Rose - One of the best experts on this subject based on the ideXlab platform.
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effect of surface sampling and recovery of viruses and non spore forming bacteria on a quantitative microbial risk assessment model for fomites
Environmental Science & Technology, 2016Co-Authors: Mark H Weir, Tomoyuki Shibata, Yoshifumi Masago, Dena L Cologgi, Joan B RoseAbstract:Quantitative microbial risk assessment (QMRA) is a powerful decision analytics tool, yet it faces challenges when modeling health risks for the indoor environment. One limitation is uncertainty in fomite recovery for evaluating the efficiency of decontamination. Addressing this data gap has become more important as a result of response and recovery from a potential malicious pathogen release. To develop more accurate QMRA models, recovery efficiency from non-porous fomites (aluminum, ceramic, glass, plastic, steel, and Wood Laminate) was investigated. Fomite material, surface area (10, 100, and 900 cm2), recovery tool (swabs and wipes), initial concentration on the fomites and eluent (polysorbate 80, trypticase soy broth, and beef extract) were evaluated in this research. Recovery was shown to be optimized using polysorbate 80, sampling with wipes, and sampling a surface area of 10–100 cm2. The QMRA model demonstrated, through a relative risk comparison, the need for recovery efficiency to be used in thes...
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Effect of Surface Sampling and Recovery of Viruses and Non-Spore-Forming Bacteria on a Quantitative Microbial Risk Assessment Model for Fomites
2016Co-Authors: Mark H Weir, Tomoyuki Shibata, Yoshifumi Masago, Dena L Cologgi, Joan B RoseAbstract:Quantitative microbial risk assessment (QMRA) is a powerful decision analytics tool, yet it faces challenges when modeling health risks for the indoor environment. One limitation is uncertainty in fomite recovery for evaluating the efficiency of decontamination. Addressing this data gap has become more important as a result of response and recovery from a potential malicious pathogen release. To develop more accurate QMRA models, recovery efficiency from non-porous fomites (aluminum, ceramic, glass, plastic, steel, and Wood Laminate) was investigated. Fomite material, surface area (10, 100, and 900 cm2), recovery tool (swabs and wipes), initial concentration on the fomites and eluent (polysorbate 80, trypticase soy broth, and beef extract) were evaluated in this research. Recovery was shown to be optimized using polysorbate 80, sampling with wipes, and sampling a surface area of 10–100 cm2. The QMRA model demonstrated, through a relative risk comparison, the need for recovery efficiency to be used in these models to prevent underestimated risks
M. P. Ansell - One of the best experts on this subject based on the ideXlab platform.
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Fatigue damage and hysteresis in Wood-epoxy Laminates
Journal of Materials Science, 2001Co-Authors: C. L. Hacker, M. P. AnsellAbstract:Wood-epoxy Laminates were subjected to constant amplitude fatigue tests in tension-tension ( R = 0.1), compression-compression ( R = 10) and reverse loading ( R = −1) in order to follow property changes and fatigue damage accumulation. Hysteresis loops were captured during these tests and the form of stress versus number of cycles to failure ( S - N ) curves was established. Reversed loading is the most damaging mode of cyclic stress application. In terms of static strengths, the Wood Laminate is weaker in compression than in tension. However at low levels of stress, following many fatigue cycles, the fatigue life is greater in compression-compression than in tension-tension. The shape of captured hysteresis loops is strongly influenced by loading mode. As subcritical damage develops, loop area increases and dynamic modulus falls. In reversed loading, loop bending and distortion is observed depending on whether the damage is tension- or compression-dominated or both. Maximum and minimum fatigue strains, the dynamic modulus and loop area have been plotted as a function of the number of fatigue cycles. The majority of damage occurs towards the end of the sample life but property changes can be detected throughout fatigue tests. Normalisation of fatigue data demonstrates that the fatigue behaviour of Wood-epoxy Laminates is consistent.
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Fatigue properties of jointed Wood composites Part I Statistical analysis, fatigue master curves and constant life diagrams
Journal of Materials Science, 1998Co-Authors: I. P. Bond, M. P. AnsellAbstract:The primary aim of this work was to assess the fatigue performance of scarf-jointed Laminated Wood composites used to manufacture wind turbine blades and establish simple fatigue design procedures. Laminates made from poplar ( Populus canadensis / serotina ), Khaya ( Khaya ivorensis ) and beech ( Fagus sylvatica ), incorporating typical scarf joints, were assessed under reversed loading ( R =−1). Scarf joints were found to be great equalizers of fatigue performance for Wood species with different static strengths. Poplar was investigated at several other R ratios (+3, −3, −0.84 and 0.33). The application of 95% survival probability limits derived from pooled data increases the statistical reliability of σ–N curves and gives an improved estimate of a material's minimum performance. The σ–N curves derived for all three Wood species at R =−1 were normalized with respect to ultimate compressive strength values and found to be practically coincidental. This allowed the derivation of a master curve for a generic scarf-jointed Wood Laminate under reversed load conditions. This relationship was verified using data from the literature and found to be a good predictor of fatigue performance. The construction of simple triangulated constant life diagrams based on static tensile and compressive tests and fatigue testing at R =−1 brings about a rapid assessment of the overall fatigue performance of any Wood composite. These can then be used in the fatigue design or life prediction of Wood composites under cyclic loading.
