The Experts below are selected from a list of 4389 Experts worldwide ranked by ideXlab platform

Chad A. Ulven - One of the best experts on this subject based on the ideXlab platform.

  • hybridized carbon and Flax Fiber composites for tailored performance
    Materials & Design, 2016
    Co-Authors: Jeff Flynn, Ali Amiri, Chad A. Ulven
    Abstract:

    Abstract Flax Fiber composites have been found to exhibit suitable mechanical properties for general applications. Natural Fibers exhibit lower mechanical properties than their synthetic counterparts as well as have a high degree of Fiber to Fiber mechanical variability based on growing conditions and plant varieties which lowers their mechanical performance predictability. However, Thermoset resins reinforced with Flax Fibers exhibit nonlinear behavior when subjected to loading which results in energy loss. This is beneficial in applications where vibration damping is anticipated. One potential method for increasing performance and strength of Flax Fiber is to hybridize it with synthetic Fibers with the goal of improving composite mechanical properties as well as reducing composite to composite mechanical variability. In this study carbon Fiber and Flax Fiber were used to manufacture different hybridized composites with varying Flax Fiber volume fractions. Resulting composites were characterized using tensile, flexural, impact and vibration tests. Also, results of experiments were compared against predictions of rule of mixture's model and Halpin-Tsai model. Findings of this study provides valuable information for designers for hybridizing Flax and carbon Fibers and results suggest that hybridizing synthetic Fibers with natural Fibers is an effective method of improving the mechanical properties and controlling vibration damping.

  • study on interfacial properties of unidirectional Flax vinyl ester composites resin manipulation on vinyl ester system
    Journal of Applied Polymer Science, 2013
    Co-Authors: Venkata S Chevali, Chad A. Ulven
    Abstract:

    Flax Fibers are widely used as reinforcements in bio-based polymer matrix composites. This study investigated the hydrophilic nature and surface purity of Flax Fiber that affects Fiber/matrix adhesion in combination with hydrophobic structural polymers via matrix modification and the utilization of Fiber treatment, specifically in a Flax/vinyl ester (VE) composite. A new method to manipulate the vinyl ester system with acrylic resin (AR) was developed to produce Flax reinforced. On the other hand, different types of chemical and physical treatments were applied on the Flax Fiber. FTIR was applied to evaluate the effects of surface treatments. Dynamic mechanical analysis (DMA) was used to analyze the unmodified and modified VE resin system. The surface of untreated and treated Flax Fibers and their composites were analyzed by scanning electronic microscopy (SEM). Sodium ethoxide-treated Flax/ VE with 1% (wt) AR caused the best mechanical performance among all the Flax/VE composites evaluated.

  • study on interfacial properties of unidirectional Flax vinyl ester composites resin manipulation on vinyl ester system
    Journal of Applied Polymer Science, 2013
    Co-Authors: Venkata S Chevali, Chad A. Ulven
    Abstract:

    Flax Fibers are widely used as reinforcements in bio-based polymer matrix composites. This study investigated the hydrophilic nature and surface purity of Flax Fiber that affects Fiber/matrix adhesion in combination with hydrophobic structural polymers via matrix modification and the utilization of Fiber treatment, specifically in a Flax/vinyl ester (VE) composite. A new method to manipulate the vinyl ester system with acrylic resin (AR) was developed to produce Flax reinforced. On the other hand, different types of chemical and physical treatments were applied on the Flax Fiber. FTIR was applied to evaluate the effects of surface treatments. Dynamic mechanical analysis (DMA) was used to analyze the unmodified and modified VE resin system. The surface of untreated and treated Flax Fibers and their composites were analyzed by scanning electronic microscopy (SEM). Sodium ethoxide-treated Flax/ VE with 1% (wt) AR caused the best mechanical performance among all the Flax/VE composites evaluated.

Hyunbum Park - One of the best experts on this subject based on the ideXlab platform.

  • design and manufacturing of automobile hood using natural composite structure
    Composites Part B-engineering, 2016
    Co-Authors: Changduk Kong, Haseung Lee, Hyunbum Park
    Abstract:

    Abstract Recently, there has been a growing interest in the use of naturally sourced Fibers for use in composites design and manufacture. In this work, a structural design on automobile hood using natural Flax Fiber composite was performed. The structural design results of Flax/vinyl ester composite hood were compared with the design results of metal hood structure. Through the structural analyses using commercial FEM software, it is confirmed that the designed automobile hood using natural composite is reasonable for structural safety, stability and weight. Through the structural test, it is confirmed that the designed hood structure is acceptable for structural safety and stability.

  • structural design of light weight natural Fiber composites for next generation automobile bonnet
    Composites Research, 2015
    Co-Authors: Kilsu Park, Changduk Kong, Hyunbum Park
    Abstract:

    In this study, structural design and analysis of the automobile bonnet is performed. The Flax/vinly ester composite material is applied for structural design. The Vacuum Assisted Resin Transfer Molding-Light (VARTML) manufacturing method is adopted for manufacturing the Flax Fiber composite bonnet. The VARTML is a manufacturing process that the resin is injected into the fly layered-up Fibers enclosed by a rigid mold tool under vacuum. A series of Flax/vinyl ester composite panels are manufactured, and several kinds of specimens cut out from the panels are tested to obtain mechanical performance data. Based on this, structural design of the automobile bonnet is performed.

  • study on structural design and analysis of Flax natural Fiber composite tank manufactured by vacuum assisted resin transfer molding
    Materials Letters, 2014
    Co-Authors: Changduk Kong, Hyunbum Park, Joungwhan Lee
    Abstract:

    Abstract Recently, there has been a growing interest in the use of naturally sourced Fibers for use in composites design and manufacture. In this study, an investigation on mechanical properties of Flax/vinyl ester natural Fiber composite was performed as a precedent study on the design of eco-friendly structure using Flax/vinyl ester composite. A Vacuum Assisted Resin Transfer Molding(VARTM) manufacturing method was adopted for manufacturing the Flax Fiber composite specimen. The mechanical properties of the manufactured Flax composites were compared with Flax composite data cited from some references. Based on this, structural design of chemical storage tank for agricultural vehicle was performed using Flax/vinyl ester. After structural design and analysis, the resin flow analysis of the VARTM manufacturing method was performed. Through the structural test, it is confirmed that the designed chemical storage tank is acceptable for structural safety and stability.

Changduk Kong - One of the best experts on this subject based on the ideXlab platform.

  • design and manufacturing of automobile hood using natural composite structure
    Composites Part B-engineering, 2016
    Co-Authors: Changduk Kong, Haseung Lee, Hyunbum Park
    Abstract:

    Abstract Recently, there has been a growing interest in the use of naturally sourced Fibers for use in composites design and manufacture. In this work, a structural design on automobile hood using natural Flax Fiber composite was performed. The structural design results of Flax/vinyl ester composite hood were compared with the design results of metal hood structure. Through the structural analyses using commercial FEM software, it is confirmed that the designed automobile hood using natural composite is reasonable for structural safety, stability and weight. Through the structural test, it is confirmed that the designed hood structure is acceptable for structural safety and stability.

  • structural design of light weight natural Fiber composites for next generation automobile bonnet
    Composites Research, 2015
    Co-Authors: Kilsu Park, Changduk Kong, Hyunbum Park
    Abstract:

    In this study, structural design and analysis of the automobile bonnet is performed. The Flax/vinly ester composite material is applied for structural design. The Vacuum Assisted Resin Transfer Molding-Light (VARTML) manufacturing method is adopted for manufacturing the Flax Fiber composite bonnet. The VARTML is a manufacturing process that the resin is injected into the fly layered-up Fibers enclosed by a rigid mold tool under vacuum. A series of Flax/vinyl ester composite panels are manufactured, and several kinds of specimens cut out from the panels are tested to obtain mechanical performance data. Based on this, structural design of the automobile bonnet is performed.

  • study on structural design and analysis of Flax natural Fiber composite tank manufactured by vacuum assisted resin transfer molding
    Materials Letters, 2014
    Co-Authors: Changduk Kong, Hyunbum Park, Joungwhan Lee
    Abstract:

    Abstract Recently, there has been a growing interest in the use of naturally sourced Fibers for use in composites design and manufacture. In this study, an investigation on mechanical properties of Flax/vinyl ester natural Fiber composite was performed as a precedent study on the design of eco-friendly structure using Flax/vinyl ester composite. A Vacuum Assisted Resin Transfer Molding(VARTM) manufacturing method was adopted for manufacturing the Flax Fiber composite specimen. The mechanical properties of the manufactured Flax composites were compared with Flax composite data cited from some references. Based on this, structural design of chemical storage tank for agricultural vehicle was performed using Flax/vinyl ester. After structural design and analysis, the resin flow analysis of the VARTM manufacturing method was performed. Through the structural test, it is confirmed that the designed chemical storage tank is acceptable for structural safety and stability.

Joungwhan Lee - One of the best experts on this subject based on the ideXlab platform.

  • study on structural design and analysis of Flax natural Fiber composite tank manufactured by vacuum assisted resin transfer molding
    Materials Letters, 2014
    Co-Authors: Changduk Kong, Hyunbum Park, Joungwhan Lee
    Abstract:

    Abstract Recently, there has been a growing interest in the use of naturally sourced Fibers for use in composites design and manufacture. In this study, an investigation on mechanical properties of Flax/vinyl ester natural Fiber composite was performed as a precedent study on the design of eco-friendly structure using Flax/vinyl ester composite. A Vacuum Assisted Resin Transfer Molding(VARTM) manufacturing method was adopted for manufacturing the Flax Fiber composite specimen. The mechanical properties of the manufactured Flax composites were compared with Flax composite data cited from some references. Based on this, structural design of chemical storage tank for agricultural vehicle was performed using Flax/vinyl ester. After structural design and analysis, the resin flow analysis of the VARTM manufacturing method was performed. Through the structural test, it is confirmed that the designed chemical storage tank is acceptable for structural safety and stability.

Ismail H Tavman - One of the best experts on this subject based on the ideXlab platform.

  • effects of the atmospheric plasma treatments on surface and mechanical properties of Flax Fiber and adhesion between Fiber matrix for composite materials
    Composites Part B-engineering, 2013
    Co-Authors: Ebru Bozaci, Kutlay Sever, Mehmet Sarikanat, Yoldas Seki, Asli Demir, Esen Ozdogan, Ismail H Tavman
    Abstract:

    Abstract In this study, Flax Fibers were treated by argon and air atmospheric pressure plasma systems under various plasma powers to improve interfacial adhesion between the Flax Fiber and high density polyethylene (HDPE) and unsaturated polyester. The interfacial adhesion of argon treated Flax Fiber for HDPE matrix is superior than those of air treated and untreated Flax Fiber. However for the adhesion between Flax Fiber and polyester matrix, air treatment is more efficient than argon treatment. Besides, greater plasma power causes greater interfacial adhesion, which was proved by pull out tests. The surface characteristics of Flax Fibers were examined using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Scanning electron microscopy (SEM), and roughness tests. X-ray photoelectron spectroscopy analysis (XPS) indicated that the air plasma-treated Fiber had higher oxygen concentration and higher oxygen/carbon ratio than the untreated Fiber and argon plasma treated Fiber. Changes in the surface chemical composition and functional groups, and increases in surface roughness were obtained. After both plasma treatments, it was clearly seen that a new functional group (O C O) generates on the Flax Fiber surface.

  • effects of the atmospheric plasma treatments on surface and mechanical properties of Flax Fiber and adhesion between Fiber matrix for composite materials
    Composites Part B-engineering, 2013
    Co-Authors: Ebru Bozaci, Kutlay Sever, Mehmet Sarikanat, Yoldas Seki, Asli Demir, Esen Ozdogan, Ismail H Tavman
    Abstract:

    Abstract In this study, Flax Fibers were treated by argon and air atmospheric pressure plasma systems under various plasma powers to improve interfacial adhesion between the Flax Fiber and high density polyethylene (HDPE) and unsaturated polyester. The interfacial adhesion of argon treated Flax Fiber for HDPE matrix is superior than those of air treated and untreated Flax Fiber. However for the adhesion between Flax Fiber and polyester matrix, air treatment is more efficient than argon treatment. Besides, greater plasma power causes greater interfacial adhesion, which was proved by pull out tests. The surface characteristics of Flax Fibers were examined using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Scanning electron microscopy (SEM), and roughness tests. X-ray photoelectron spectroscopy analysis (XPS) indicated that the air plasma-treated Fiber had higher oxygen concentration and higher oxygen/carbon ratio than the untreated Fiber and argon plasma treated Fiber. Changes in the surface chemical composition and functional groups, and increases in surface roughness were obtained. After both plasma treatments, it was clearly seen that a new functional group (O C O) generates on the Flax Fiber surface.