The Experts below are selected from a list of 23370 Experts worldwide ranked by ideXlab platform

Isao Fukumoto - One of the best experts on this subject based on the ideXlab platform.

  • Flexural Modulus of the unidirectional and random composites made from biodegradable resin and bamboo and kenaf fibres
    Composites Part A-applied Science and Manufacturing, 2008
    Co-Authors: Shinichi Shibata, Isao Fukumoto
    Abstract:

    Abstract Bio-based polymer composites made from kenaf, bamboo and biodegradable resin, which was a corn starch base were fabricated with press forming. The relationship between fibre Young’s Modulus and Flexural Modulus in composites was investigated. The Young’s Modulus of each fibre was measured to predict the Flexural Modulus in composites. The Flexural Modulus in composites was predicted by Cox model, which incorporates the effect of the fibre compression. The Flexural Modulus increased with increasing the fibre content. In the case of kenaf, the Flexural Modulus in the experimental was in good agreement with the experimental. While in the case of bamboo, the difference between experimental and calculation was large. This is because Young’s Modulus in bamboo was estimated considerably lower than the actual Modulus due to partial breakage of bamboo during single fibre tensile test. The Flexural Modulus in unidirectional fibre composite made a good agreement with the predicted. However, the Flexural Modulus in cross ply composite was considerably lower than the predicted. This is because less fibres movement during hot pressing resulted in the resin segregation and the movement made the fibres less wetting with resin.

  • study of the Flexural Modulus of natural fiber polypropylene composites by injection molding
    Journal of Applied Polymer Science, 2006
    Co-Authors: Shinichi Shibata, Yong Cao, Isao Fukumoto
    Abstract:

    Effect of fiber compression on Flexural Modulus of the natural fiber composites was examined. The kenaf, bagasse, and polypropylene were mixed into pellets, and composites were fabricated by injection molding. To predict Flexural Modulus of the composites, the Young's Modulus of kenaf and bagasse fiber were measured. Using the obtained Young's Modulus, the Flexural Modulus of the composites was predicted by Cox's model that incorporates the effect of fiber compression. It was found that those fibers with high Young's Modulus were more compressed than that with low Young's Modulus. Moreover, the distribution of fiber length and orientation in the composites were also investigated. To calculate the orientation factor for the prediction model, the distribution function of fiber orientation was determined to a triangular function. The Flexural Modulus of the composites increased with increase of volume fraction. The predicted values were in good agreement with the experimental values. Furthermore, it was revealed by SEM that the porous structure of the natural fibers was compressed. The fiber compression ratio (3.6) in bagasse was higher than that in kenaf (1.4) due to the difference in porous structure. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 911–917, 2006

  • lightweight laminate composites made from kenaf and polypropylene fibres
    Polymer Testing, 2006
    Co-Authors: Shinichi Shibata, Isao Fukumoto
    Abstract:

    Lightweight laminate composites made from kenaf and polypropylene (PP) fibres were fabricated by press forming. The effects of the number of kenaf layers, heating time and kenaf weight fraction on the Flexural Modulus of the composite specimen were investigated. The Flexural Modulus increased with increasing number of kenaf layers and heating time. The increase of the number of kenaf layers contributed to homogeneous PP dispersion in the composite board. This is because more kenaf layers caused better contact between kenaf and PP and prevented PP fibres from shrinking by heating. The increase of heating time contributed to better wetting between kenaf and PP. These observations were revealed with SEM microphotographs. Moreover, the Flexural Modulus difference between experiment and calculation, which was predicted by Cox's model, increased with decrease of the bulk density and PP weight fraction in the composite board. This was attributed to the decrease of the contact area between kenaf and PP decreasing stress transfer efficiency by kenaf in the lightweight laminate composites. Thus, the optimized kenaf weight fraction, which showed maximum Flexural Modulus of the composite specimen, decreased with decrease of the bulk density.

  • press forming of short natural fiber reinforced biodegradable resin effects of fiber volume and length on Flexural properties
    Polymer Testing, 2005
    Co-Authors: Shinichi Shibata, Yong Cao, Isao Fukumoto
    Abstract:

    The effects of the volume fraction and length of natural fibers on Flexural properties of biodegradable composites were investigated. Kenaf and bagasse were mixed with corn-starch biodegradable resin, and composite Flexural specimens were fabricated by press forming. Cox's model that incorporates the effect of fiber compression in the cross section was applied to calculate the Flexural Modulus. Bagasse was found to be more compressible than kenaf due to the difference structure in the cross section. For up to 60% volume fraction kenaf and 66% bagasse composites, the Flexural Modulus increased with increase in fiber volume fraction, and these results were in good agreement with the calculated values. However, above 60% fiber volume fraction kenaf and 66% bagasse, the Flexural Modulus decreased due to insufficient resin. Moreover, the decrease of the Flexural Modulus occurred at fiber lengths 2.8 mm kenaf and 3.2 mm bagasse. Above these fiber lengths, there was no change in the Flexural Modulus of the composite specimens. This trend was also identified by the calculation.

  • effect of bagasse fiber on the Flexural properties of biodegradable composites
    Polymer Composites, 2005
    Co-Authors: Shinichi Shibata, Isao Fukumoto
    Abstract:

    Flexural Modulus of the press-molding composites made from bagasse fiber and biodegradable resin was investigated by experiment and numerical prediction with Cox's model that incorporates the compression ratio of the bagasse fiber in the cross section. The effect of the volume fraction of bagasse fiber and its length on the Flexural Modulus was examined. Up to 65% volume fraction in the experiment, the Flexural Modulus increased with increase of the volume fraction of the bagasse fiber. The numerical prediction was in good agreement with the experimental result. Above 65% volume fraction, however, the Flexural Modulus decreased in the experiment, while the prediction increased. It seemed that the biodegradable resin was insufficient to cover all the surface of bagasse fiber in the composite. Moreover, the decrease of the Flexural Modulus was found below 3 mm at the fiber length in the experimental and the same trend was shown in the numerical prediction. POLYM. COMPOS. 26:689–694, 2005. © 2005 Society of Plastics Engineers

Manjusri Misra - One of the best experts on this subject based on the ideXlab platform.

  • static and dynamic mechanical properties of vinylester resin matrix composites filled with fly ash
    Macromolecular Materials and Engineering, 2006
    Co-Authors: Dipa Ray, Debadrita Bhattacharya, Amar K. Mohanty, Lawrence T Drzal, Manjusri Misra
    Abstract:

    Vinylester resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the Flexural strength was lowered in all the filled composites, but the Flexural Modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the neat resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage Modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed Flexural Modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.

  • static and dynamic mechanical properties of vinylester resin matrix composites filled with fly ash
    Macromolecular Materials and Engineering, 2006
    Co-Authors: Dipa Ray, Debadrita Bhattacharya, Amar K. Mohanty, Lawrence T Drzal, Manjusri Misra
    Abstract:

    Vinylester resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the Flexural strength was lowered in all the filled composites, but the Flexural Modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the neat resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage Modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed Flexural Modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.

Shinichi Shibata - One of the best experts on this subject based on the ideXlab platform.

  • Flexural Modulus of the unidirectional and random composites made from biodegradable resin and bamboo and kenaf fibres
    Composites Part A-applied Science and Manufacturing, 2008
    Co-Authors: Shinichi Shibata, Isao Fukumoto
    Abstract:

    Abstract Bio-based polymer composites made from kenaf, bamboo and biodegradable resin, which was a corn starch base were fabricated with press forming. The relationship between fibre Young’s Modulus and Flexural Modulus in composites was investigated. The Young’s Modulus of each fibre was measured to predict the Flexural Modulus in composites. The Flexural Modulus in composites was predicted by Cox model, which incorporates the effect of the fibre compression. The Flexural Modulus increased with increasing the fibre content. In the case of kenaf, the Flexural Modulus in the experimental was in good agreement with the experimental. While in the case of bamboo, the difference between experimental and calculation was large. This is because Young’s Modulus in bamboo was estimated considerably lower than the actual Modulus due to partial breakage of bamboo during single fibre tensile test. The Flexural Modulus in unidirectional fibre composite made a good agreement with the predicted. However, the Flexural Modulus in cross ply composite was considerably lower than the predicted. This is because less fibres movement during hot pressing resulted in the resin segregation and the movement made the fibres less wetting with resin.

  • study of the Flexural Modulus of natural fiber polypropylene composites by injection molding
    Journal of Applied Polymer Science, 2006
    Co-Authors: Shinichi Shibata, Yong Cao, Isao Fukumoto
    Abstract:

    Effect of fiber compression on Flexural Modulus of the natural fiber composites was examined. The kenaf, bagasse, and polypropylene were mixed into pellets, and composites were fabricated by injection molding. To predict Flexural Modulus of the composites, the Young's Modulus of kenaf and bagasse fiber were measured. Using the obtained Young's Modulus, the Flexural Modulus of the composites was predicted by Cox's model that incorporates the effect of fiber compression. It was found that those fibers with high Young's Modulus were more compressed than that with low Young's Modulus. Moreover, the distribution of fiber length and orientation in the composites were also investigated. To calculate the orientation factor for the prediction model, the distribution function of fiber orientation was determined to a triangular function. The Flexural Modulus of the composites increased with increase of volume fraction. The predicted values were in good agreement with the experimental values. Furthermore, it was revealed by SEM that the porous structure of the natural fibers was compressed. The fiber compression ratio (3.6) in bagasse was higher than that in kenaf (1.4) due to the difference in porous structure. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 911–917, 2006

  • lightweight laminate composites made from kenaf and polypropylene fibres
    Polymer Testing, 2006
    Co-Authors: Shinichi Shibata, Isao Fukumoto
    Abstract:

    Lightweight laminate composites made from kenaf and polypropylene (PP) fibres were fabricated by press forming. The effects of the number of kenaf layers, heating time and kenaf weight fraction on the Flexural Modulus of the composite specimen were investigated. The Flexural Modulus increased with increasing number of kenaf layers and heating time. The increase of the number of kenaf layers contributed to homogeneous PP dispersion in the composite board. This is because more kenaf layers caused better contact between kenaf and PP and prevented PP fibres from shrinking by heating. The increase of heating time contributed to better wetting between kenaf and PP. These observations were revealed with SEM microphotographs. Moreover, the Flexural Modulus difference between experiment and calculation, which was predicted by Cox's model, increased with decrease of the bulk density and PP weight fraction in the composite board. This was attributed to the decrease of the contact area between kenaf and PP decreasing stress transfer efficiency by kenaf in the lightweight laminate composites. Thus, the optimized kenaf weight fraction, which showed maximum Flexural Modulus of the composite specimen, decreased with decrease of the bulk density.

  • press forming of short natural fiber reinforced biodegradable resin effects of fiber volume and length on Flexural properties
    Polymer Testing, 2005
    Co-Authors: Shinichi Shibata, Yong Cao, Isao Fukumoto
    Abstract:

    The effects of the volume fraction and length of natural fibers on Flexural properties of biodegradable composites were investigated. Kenaf and bagasse were mixed with corn-starch biodegradable resin, and composite Flexural specimens were fabricated by press forming. Cox's model that incorporates the effect of fiber compression in the cross section was applied to calculate the Flexural Modulus. Bagasse was found to be more compressible than kenaf due to the difference structure in the cross section. For up to 60% volume fraction kenaf and 66% bagasse composites, the Flexural Modulus increased with increase in fiber volume fraction, and these results were in good agreement with the calculated values. However, above 60% fiber volume fraction kenaf and 66% bagasse, the Flexural Modulus decreased due to insufficient resin. Moreover, the decrease of the Flexural Modulus occurred at fiber lengths 2.8 mm kenaf and 3.2 mm bagasse. Above these fiber lengths, there was no change in the Flexural Modulus of the composite specimens. This trend was also identified by the calculation.

  • effect of bagasse fiber on the Flexural properties of biodegradable composites
    Polymer Composites, 2005
    Co-Authors: Shinichi Shibata, Isao Fukumoto
    Abstract:

    Flexural Modulus of the press-molding composites made from bagasse fiber and biodegradable resin was investigated by experiment and numerical prediction with Cox's model that incorporates the compression ratio of the bagasse fiber in the cross section. The effect of the volume fraction of bagasse fiber and its length on the Flexural Modulus was examined. Up to 65% volume fraction in the experiment, the Flexural Modulus increased with increase of the volume fraction of the bagasse fiber. The numerical prediction was in good agreement with the experimental result. Above 65% volume fraction, however, the Flexural Modulus decreased in the experiment, while the prediction increased. It seemed that the biodegradable resin was insufficient to cover all the surface of bagasse fiber in the composite. Moreover, the decrease of the Flexural Modulus was found below 3 mm at the fiber length in the experimental and the same trend was shown in the numerical prediction. POLYM. COMPOS. 26:689–694, 2005. © 2005 Society of Plastics Engineers

Dipa Ray - One of the best experts on this subject based on the ideXlab platform.

  • static and dynamic mechanical properties of vinylester resin matrix composites filled with fly ash
    Macromolecular Materials and Engineering, 2006
    Co-Authors: Dipa Ray, Debadrita Bhattacharya, Amar K. Mohanty, Lawrence T Drzal, Manjusri Misra
    Abstract:

    Vinylester resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the Flexural strength was lowered in all the filled composites, but the Flexural Modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the neat resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage Modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed Flexural Modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.

  • static and dynamic mechanical properties of vinylester resin matrix composites filled with fly ash
    Macromolecular Materials and Engineering, 2006
    Co-Authors: Dipa Ray, Debadrita Bhattacharya, Amar K. Mohanty, Lawrence T Drzal, Manjusri Misra
    Abstract:

    Vinylester resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the Flexural strength was lowered in all the filled composites, but the Flexural Modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the neat resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage Modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed Flexural Modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.

Amar K. Mohanty - One of the best experts on this subject based on the ideXlab platform.

  • static and dynamic mechanical properties of vinylester resin matrix composites filled with fly ash
    Macromolecular Materials and Engineering, 2006
    Co-Authors: Dipa Ray, Debadrita Bhattacharya, Amar K. Mohanty, Lawrence T Drzal, Manjusri Misra
    Abstract:

    Vinylester resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the Flexural strength was lowered in all the filled composites, but the Flexural Modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the neat resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage Modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed Flexural Modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.

  • static and dynamic mechanical properties of vinylester resin matrix composites filled with fly ash
    Macromolecular Materials and Engineering, 2006
    Co-Authors: Dipa Ray, Debadrita Bhattacharya, Amar K. Mohanty, Lawrence T Drzal, Manjusri Misra
    Abstract:

    Vinylester resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the Flexural strength was lowered in all the filled composites, but the Flexural Modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the neat resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage Modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed Flexural Modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.