The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
F Ellyin - One of the best experts on this subject based on the ideXlab platform.
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Transverse Cracking of symmetric and unsymmetric glass fibre epoxy resin laminates
Composites Science and Technology, 1997Co-Authors: J W Hoover, Daniel Kujawski, F EllyinAbstract:Abstract his paper presents the results of an experimental investigation into Transverse Cracking of symmetric and unsymmetric glass-fibre/epoxy-resin laminates. The test specimens were fabricated in house and were of two types: symmetric [± θ 90 3 ] s with θ = 0 °, 25 °, 45 °, and unsymmetric [± gq/90 6 0 2 ] T with θ = 25 ° and 45 °. Through-specimen-width matrix cracks were recorded visually. Testing was performed in quasi-static load (stress) control and displacement (strain) control with hold-time periods of 3 min, 1 h and 24 h. During loadcontrolled tests, Transverse cracks initiated during a fixed-stress hold-time period but correlated well with measured strain. Displacement-controlled tests showed that the number of Transverse cracks was not reduced by increasing the duration of the fixed-strain hold-time period. The effect of Transverse cracks on stiffness was investigated and three stages of stiffness reduction were observed. In the intermediate range, the stiffness reduction was linear with respect to the number of Transverse cracks. Stiffness losses at the initial stage of loading were observed before Transverse Cracking. There was also a reduction in stiffness near final specimen failure due to delamination and fibre breakage.
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Transverse Cracking of symmetric and unsymmetric glass-fibre/epoxy-resin laminates
Composites Science and Technology, 1997Co-Authors: J W Hoover, Daniel Kujawski, F EllyinAbstract:Abstract his paper presents the results of an experimental investigation into Transverse Cracking of symmetric and unsymmetric glass-fibre/epoxy-resin laminates. The test specimens were fabricated in house and were of two types: symmetric [± θ 90 3 ] s with θ = 0 °, 25 °, 45 °, and unsymmetric [± gq/90 6 0 2 ] T with θ = 25 ° and 45 °. Through-specimen-width matrix cracks were recorded visually. Testing was performed in quasi-static load (stress) control and displacement (strain) control with hold-time periods of 3 min, 1 h and 24 h. During loadcontrolled tests, Transverse cracks initiated during a fixed-stress hold-time period but correlated well with measured strain. Displacement-controlled tests showed that the number of Transverse cracks was not reduced by increasing the duration of the fixed-strain hold-time period. The effect of Transverse cracks on stiffness was investigated and three stages of stiffness reduction were observed. In the intermediate range, the stiffness reduction was linear with respect to the number of Transverse cracks. Stiffness losses at the initial stage of loading were observed before Transverse Cracking. There was also a reduction in stiffness near final specimen failure due to delamination and fibre breakage.
Shinji Ogihara - One of the best experts on this subject based on the ideXlab platform.
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a probabilistic static fatigue model for Transverse Cracking in cfrp cross ply laminates
Composites Science and Technology, 2009Co-Authors: Shigeki Yashiro, Manabu Takahashi, Shinji OgiharaAbstract:This paper presents a delayed-fracture model for Transverse Cracking in CFRP cross-ply laminates under static fatigue loading. First, a delayed-fracture model for a crack in a brittle material was established on the basis of the slow crack growth (SCG) concept in conjunction with a probabilistic fracture model using the three-parameter Weibull distribution. Second, the above probabilistic SCG model was applied to Transverse Cracking in cross-ply laminates under static fatigue loading. The stress and the length of the unit element in the Transverse layers were calculated with the aid of a shear-lag analysis, taking the residual stress into account. The Transverse crack density was expressed as a function of applied stress and time with the parameters in the Paris law and the Weibull distribution function specified, in addition to the mechanical and geometrical properties. Unknown parameters were determined from experiment data gathered in static tensile and static fatigue tests. The reproduced Transverse crack density at various applied loads agreed well with the experiment results.
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damage mechanics characterization of Transverse Cracking behavior in quasi isotropic cfrp laminates with interlaminar toughened layers
International Journal of Fatigue, 2002Co-Authors: Shinji Ogihara, Nobuo Takeda, Satoshi Kobayashi, Akira KobayashiAbstract:Abstract Microscopic damage behavior in quasi-isotropic CFRP laminates with interlaminar-toughened layers under tensile fatigue loading is investigated. Damage observation is conducted using an optical microscope and soft X-ray radiography. The material used is CFRP with interlaminar-toughened layers, T800H/3900-2. The laminate configurations are quasi-isotropic [45/0/−45/90] s , [0/45/−45/90] s and [45/−45/0/90] s to discuss the effect of stacking sequence on microscopic fatigue damages. A damage mechanics analysis is used to obtain the energy release rate for Transverse Cracking which is correlated to the Transverse crack density growth rate. The modified Paris-law analysis proves to be valid for characterization of Transverse crack multiplication when the effect of other damage is small.
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damage mechanics characterization of Transverse Cracking behavior in high temperature cfrp laminates
Composites Science and Technology, 2001Co-Authors: Shinji Ogihara, Nobuo Takeda, Satoshi Kobayashi, Akira KobayashiAbstract:Abstract Transverse Cracking under tensile loading in high-temperature CFRP, carbon/BMI (bismaleimide), G40-800/5260, has been investigated experimentally. Carbon/epoxy, T800H/3900-2, composite laminates are also examined for comparison. Both material systems have toughened-interlaminar layers. Laminate configurations are [0/90]s, [0/902]s, [±45/90]s and [±45/902]s for G40-800/5260, while [0/90]s and [±45/90]s for T800H/3900-2. In all laminates, the first microscopic damage observed is a 90° ply Transverse crack. In [±45/90n]s type laminates, Cracking in 45°ply and delaminations are also observed. The Cracking behavior is quantified by measuring crack densities as a function of the laminate strain. The difference between the damage progress near the 90° ply Transverse crack tips between the material systems are observed. Damage mechanics analysis is used to predict 90° ply Transverse Cracking based on both the energy and stress criteria. The present analysis can be used as a means of characterization of the Transverse Cracking resistance of a material, which will be helpful in ranking materials.
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damage mechanics analysis of Transverse Cracking behavior in composite laminates
International Journal of Damage Mechanics, 2000Co-Authors: Shinji Ogihara, Akira Kobayashi, Nobuo Takeda, Satoshi KobayashiAbstract:A damage mechanics analysis is applied to predict Transverse Cracking in a laminated composite. Two criteria based on the energy release rate and the average ply stress are used to predict Transverse Cracking. The analytical prediction of Transverse crack density as a function of applied laminate strain is favorably compared with the experimental results. An advantage of the present predictive method is that it can be applied to laminates with arbitrary stacking sequences.
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Damage Mechanics Analysis of Transverse Cracking Evolution in Delaminated CFRP Laminates
Journal of Reinforced Plastics and Composites, 1999Co-Authors: Satoshi Kobayashi, Shinji Ogihara, Nobuo Takeda, Akira KobayashiAbstract:A damage mechanics analysis was applied to predict Transverse crack evolution in a laminated composite. The analysis was originally developed to predict thermoelastic properties of a laminate containing Transverse cracks. Two criteria based on both critical average ply stress and critical energy release rate were used to discuss the Transverse Cracking behavior. The effect of delamination was also considered in the present study. The predictions of Transverse crack density based on both criteria were successfully compared with experimenta results. This analysis can be applied to laminate with arbitrary lay-up configuration.
Nobuo Takeda - One of the best experts on this subject based on the ideXlab platform.
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experimental and analytical characterization of Transverse Cracking behavior in carbon bismaleimide cross ply laminates under mechanical fatigue loading
Composites Part B-engineering, 2002Co-Authors: Satoshi Kobayashi, Nobuo TakedaAbstract:Abstract Transverse Cracking behavior in high temperature bismaleimide-based carbon fiber reinforced plastics (CFRP) laminates under fatigue loading was observed. Three types of cross-ply laminate, [0/902/0], [02/903/02] and [02/904/02], were tested to study the effect of ply thickness. Damage observation was conducted using two methods. Optical microscopy and soft X-ray radiography were used for edge and internal damage observation, respectively. Variational approach was used to derive the energy release rate associated with Transverse Cracking. Multiplication of Transverse cracks was modeled based on modified Paris-law approach.
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damage mechanics characterization of Transverse Cracking behavior in quasi isotropic cfrp laminates with interlaminar toughened layers
International Journal of Fatigue, 2002Co-Authors: Shinji Ogihara, Nobuo Takeda, Satoshi Kobayashi, Akira KobayashiAbstract:Abstract Microscopic damage behavior in quasi-isotropic CFRP laminates with interlaminar-toughened layers under tensile fatigue loading is investigated. Damage observation is conducted using an optical microscope and soft X-ray radiography. The material used is CFRP with interlaminar-toughened layers, T800H/3900-2. The laminate configurations are quasi-isotropic [45/0/−45/90] s , [0/45/−45/90] s and [45/−45/0/90] s to discuss the effect of stacking sequence on microscopic fatigue damages. A damage mechanics analysis is used to obtain the energy release rate for Transverse Cracking which is correlated to the Transverse crack density growth rate. The modified Paris-law analysis proves to be valid for characterization of Transverse crack multiplication when the effect of other damage is small.
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damage mechanics characterization of Transverse Cracking behavior in high temperature cfrp laminates
Composites Science and Technology, 2001Co-Authors: Shinji Ogihara, Nobuo Takeda, Satoshi Kobayashi, Akira KobayashiAbstract:Abstract Transverse Cracking under tensile loading in high-temperature CFRP, carbon/BMI (bismaleimide), G40-800/5260, has been investigated experimentally. Carbon/epoxy, T800H/3900-2, composite laminates are also examined for comparison. Both material systems have toughened-interlaminar layers. Laminate configurations are [0/90]s, [0/902]s, [±45/90]s and [±45/902]s for G40-800/5260, while [0/90]s and [±45/90]s for T800H/3900-2. In all laminates, the first microscopic damage observed is a 90° ply Transverse crack. In [±45/90n]s type laminates, Cracking in 45°ply and delaminations are also observed. The Cracking behavior is quantified by measuring crack densities as a function of the laminate strain. The difference between the damage progress near the 90° ply Transverse crack tips between the material systems are observed. Damage mechanics analysis is used to predict 90° ply Transverse Cracking based on both the energy and stress criteria. The present analysis can be used as a means of characterization of the Transverse Cracking resistance of a material, which will be helpful in ranking materials.
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damage mechanics analysis of Transverse Cracking behavior in composite laminates
International Journal of Damage Mechanics, 2000Co-Authors: Shinji Ogihara, Akira Kobayashi, Nobuo Takeda, Satoshi KobayashiAbstract:A damage mechanics analysis is applied to predict Transverse Cracking in a laminated composite. Two criteria based on the energy release rate and the average ply stress are used to predict Transverse Cracking. The analytical prediction of Transverse crack density as a function of applied laminate strain is favorably compared with the experimental results. An advantage of the present predictive method is that it can be applied to laminates with arbitrary stacking sequences.
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Damage Mechanics Analysis of Transverse Cracking Evolution in Delaminated CFRP Laminates
Journal of Reinforced Plastics and Composites, 1999Co-Authors: Satoshi Kobayashi, Shinji Ogihara, Nobuo Takeda, Akira KobayashiAbstract:A damage mechanics analysis was applied to predict Transverse crack evolution in a laminated composite. The analysis was originally developed to predict thermoelastic properties of a laminate containing Transverse cracks. Two criteria based on both critical average ply stress and critical energy release rate were used to discuss the Transverse Cracking behavior. The effect of delamination was also considered in the present study. The predictions of Transverse crack density based on both criteria were successfully compared with experimenta results. This analysis can be applied to laminate with arbitrary lay-up configuration.
Louay N Mohammad - One of the best experts on this subject based on the ideXlab platform.
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long term field Transverse Cracking performance of warm mix asphalt pavement and its significant material property
Transportation Research Record, 2016Co-Authors: Shenghua Wu, Weiguang Zhang, Shihui Shen, Ahmed Faheem, Louay N MohammadAbstract:With the growing awareness of sustainable construction practices and because warm-mix asphalt (WMA) is environmentally friendly, WMA is gaining popularity for pavement construction in the United States. Currently, it is generally believed that rutting and moisture damage are two major concerns for WMA pavements, but because WMA requires less aging, its Cracking resistance is expected to be improved. One of the primary Cracking distresses of concern is Transverse Cracking, which could be thermal Cracking in asphalt pavement or reflective Cracking in asphalt overlay caused by underlying thermal Cracking. Thus, Transverse Cracking is another primary distress. This study investigated the long-term field Transverse Cracking of 28 pavement projects, including WMA pavements and corresponding hot-mix asphalt (HMA) control pavements across the United States, covering different climate zones, WMA technologies, service years, pavement structures, and traffic volume levels. Two distress surveys were conducted at an i...
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development of predictive models for initiation and propagation of field Transverse Cracking
Transportation Research Record, 2015Co-Authors: Weiguang Zhang, Shenghua Wu, Shihui Shen, Ahmed Faheem, Louay N Mohammad, Prasanta BasakAbstract:The development of field Transverse Cracking prediction models is highly complicated because of several factors, including the difficulty in differentiating thermal Cracking from reflective Cracking in the field, the high variability of field conditions, and the potential variability in crack initiation and crack propagation mechanisms. As a result, a statistical-based approach is preferred to a mechanical-based prediction model. In this study, statistical methods, partial least squares regression, and binary logistic regression were used to establish prediction models for field Transverse Cracking. Results indicated that crack initiation and crack propagation were controlled by predictor variables. Material properties (mixture creep compliance, work density, and percentage passing the No. 200 sieve), pavement structure (overlay thickness), climate (low temperature hour), and traffic (average annual daily truck traffic) were found to be key indicators for Transverse crack propagation. Low temperature hour...
Satoshi Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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experimental and analytical characterization of Transverse Cracking behavior in carbon bismaleimide cross ply laminates under mechanical fatigue loading
Composites Part B-engineering, 2002Co-Authors: Satoshi Kobayashi, Nobuo TakedaAbstract:Abstract Transverse Cracking behavior in high temperature bismaleimide-based carbon fiber reinforced plastics (CFRP) laminates under fatigue loading was observed. Three types of cross-ply laminate, [0/902/0], [02/903/02] and [02/904/02], were tested to study the effect of ply thickness. Damage observation was conducted using two methods. Optical microscopy and soft X-ray radiography were used for edge and internal damage observation, respectively. Variational approach was used to derive the energy release rate associated with Transverse Cracking. Multiplication of Transverse cracks was modeled based on modified Paris-law approach.
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damage mechanics characterization of Transverse Cracking behavior in quasi isotropic cfrp laminates with interlaminar toughened layers
International Journal of Fatigue, 2002Co-Authors: Shinji Ogihara, Nobuo Takeda, Satoshi Kobayashi, Akira KobayashiAbstract:Abstract Microscopic damage behavior in quasi-isotropic CFRP laminates with interlaminar-toughened layers under tensile fatigue loading is investigated. Damage observation is conducted using an optical microscope and soft X-ray radiography. The material used is CFRP with interlaminar-toughened layers, T800H/3900-2. The laminate configurations are quasi-isotropic [45/0/−45/90] s , [0/45/−45/90] s and [45/−45/0/90] s to discuss the effect of stacking sequence on microscopic fatigue damages. A damage mechanics analysis is used to obtain the energy release rate for Transverse Cracking which is correlated to the Transverse crack density growth rate. The modified Paris-law analysis proves to be valid for characterization of Transverse crack multiplication when the effect of other damage is small.
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damage mechanics characterization of Transverse Cracking behavior in high temperature cfrp laminates
Composites Science and Technology, 2001Co-Authors: Shinji Ogihara, Nobuo Takeda, Satoshi Kobayashi, Akira KobayashiAbstract:Abstract Transverse Cracking under tensile loading in high-temperature CFRP, carbon/BMI (bismaleimide), G40-800/5260, has been investigated experimentally. Carbon/epoxy, T800H/3900-2, composite laminates are also examined for comparison. Both material systems have toughened-interlaminar layers. Laminate configurations are [0/90]s, [0/902]s, [±45/90]s and [±45/902]s for G40-800/5260, while [0/90]s and [±45/90]s for T800H/3900-2. In all laminates, the first microscopic damage observed is a 90° ply Transverse crack. In [±45/90n]s type laminates, Cracking in 45°ply and delaminations are also observed. The Cracking behavior is quantified by measuring crack densities as a function of the laminate strain. The difference between the damage progress near the 90° ply Transverse crack tips between the material systems are observed. Damage mechanics analysis is used to predict 90° ply Transverse Cracking based on both the energy and stress criteria. The present analysis can be used as a means of characterization of the Transverse Cracking resistance of a material, which will be helpful in ranking materials.
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damage mechanics analysis of Transverse Cracking behavior in composite laminates
International Journal of Damage Mechanics, 2000Co-Authors: Shinji Ogihara, Akira Kobayashi, Nobuo Takeda, Satoshi KobayashiAbstract:A damage mechanics analysis is applied to predict Transverse Cracking in a laminated composite. Two criteria based on the energy release rate and the average ply stress are used to predict Transverse Cracking. The analytical prediction of Transverse crack density as a function of applied laminate strain is favorably compared with the experimental results. An advantage of the present predictive method is that it can be applied to laminates with arbitrary stacking sequences.
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Damage Mechanics Analysis of Transverse Cracking Evolution in Delaminated CFRP Laminates
Journal of Reinforced Plastics and Composites, 1999Co-Authors: Satoshi Kobayashi, Shinji Ogihara, Nobuo Takeda, Akira KobayashiAbstract:A damage mechanics analysis was applied to predict Transverse crack evolution in a laminated composite. The analysis was originally developed to predict thermoelastic properties of a laminate containing Transverse cracks. Two criteria based on both critical average ply stress and critical energy release rate were used to discuss the Transverse Cracking behavior. The effect of delamination was also considered in the present study. The predictions of Transverse crack density based on both criteria were successfully compared with experimenta results. This analysis can be applied to laminate with arbitrary lay-up configuration.
