The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform

Xi Che - One of the best experts on this subject based on the ideXlab platform.

  • quantitative evaluation of Adhesion Quality of surface coating by using pulse laser induced ultrasonic waves
    Surface & Coatings Technology, 2016
    Co-Authors: Yousuke Watanabe, Shoichi Fujisawa, Akio Yonezu, Xi Che
    Abstract:

    Abstract This study aims to evaluate delamination characteristics of surface coating by using strong ultrasonic wave induced by pulsed laser irradiation. Strong tensile stress wave is induced by pulse laser irradiation, and delamination of the coating layer/substrate interface (or spallation) is produced by confined silicone grease breakdown (i.e. ablation). Upon various levels of energy of irradiation laser, the coating delamination and displacement are measured in-situ. Parallel computation of elastic wave propagation using FDTD (finite difference time domain) yields the wave propagation in the specimen, and estimates the interfacial strength with stress wave distribution. The delamination area is visualized by laser ultrasonic wave scanning technique after the laser spallation test. The interaction between displacement waveform and delamination is explored. The present technique may shed some light on various coating depositions for assessing the coating Adhesion Quality.

S De Barros - One of the best experts on this subject based on the ideXlab platform.

  • interface Adhesion assessment of composite to metal bonded joints under salt spray conditions using peel tests
    Composite Structures, 2017
    Co-Authors: Teixeira S De Freitas, Mariana D. Banea, S Budhe, S De Barros
    Abstract:

    An experimental study has been carried out to assess the Adhesion Quality of composite-to-metal bonded joints under salt spray ageing conditions. The tests were performed according to the ASTM standard of floating roller peel tests with a new specimen layup. The layup and geometry of the specimen was defined in order to have the Carbon Fiber Reinforced Polymer (CFRP) and carbon steel as the rigid and flexible substrate, respectively. Specimens were exposed to salt spray (or salt fog) for 30 and 90 days. The results show that the Adhesion performance (i.e. average peel load) of the joints progressively decreases with increasing the ageing time. The fracture surfaces of dry specimens (non-aged) exhibit a cohesive failure within the adhesive layer, which indicates a good Adhesion between the CFRP-steel interfaces. Interface degradation is indicated by a drop in peel load and adhesive failure. The percentage of adhesive failure increases with ageing times. Fracture surfaces of the adhesive failure exhibit deposition of NaCl crystal at the interface. Peel test successfully assessed the interface Adhesion in aged and non-aged conditions, and can be used as a fast, easy and reliable test to study the long term durability in case of composite-metal bonded joints.

  • Adhesion Quality of steel cfrp interface bonding
    Proceedings of the Brazilian Conference on Composite Materials, 2016
    Co-Authors: S De Barros, Teixeira S De Freitas, S Budhe, Moreira M Arouche, B Dos L Santos
    Abstract:

    In this work, peel tests were used to assess the Adhesion Quality between carbon fiber reinforced polymers (CFRP) and carbon steel plates. The tests were performed according to the ASTM standard of floating roller peel tests (D3167–97) with a new specimen layup. The layup and geometry of specimens was defined in order to have the CFRP as the rigid substrate and the steel plate as a flexible substrate. The aim is to assess the Adhesion Quality of the interface in dry-conditions (short-term) and after ageing (long term). Specimens were inside the salt spray cabinet for 30 days to absorb the moisture. Results show that peel load are not significantly affected by the ageing condition. The specimens tested at dry-conditions and ageing condition showed a cohesive failure within the adhesive layer, which indicates a good Adhesion between the CFRP-Steel interfaces. Long term durability is suggested by keeping the specimen for longer duration in order to observe the degraded trend and Adhesion Quality of the joints.

Teixeira S De Freitas - One of the best experts on this subject based on the ideXlab platform.

  • interface Adhesion assessment of composite to metal bonded joints under salt spray conditions using peel tests
    Composite Structures, 2017
    Co-Authors: Teixeira S De Freitas, Mariana D. Banea, S Budhe, S De Barros
    Abstract:

    An experimental study has been carried out to assess the Adhesion Quality of composite-to-metal bonded joints under salt spray ageing conditions. The tests were performed according to the ASTM standard of floating roller peel tests with a new specimen layup. The layup and geometry of the specimen was defined in order to have the Carbon Fiber Reinforced Polymer (CFRP) and carbon steel as the rigid and flexible substrate, respectively. Specimens were exposed to salt spray (or salt fog) for 30 and 90 days. The results show that the Adhesion performance (i.e. average peel load) of the joints progressively decreases with increasing the ageing time. The fracture surfaces of dry specimens (non-aged) exhibit a cohesive failure within the adhesive layer, which indicates a good Adhesion between the CFRP-steel interfaces. Interface degradation is indicated by a drop in peel load and adhesive failure. The percentage of adhesive failure increases with ageing times. Fracture surfaces of the adhesive failure exhibit deposition of NaCl crystal at the interface. Peel test successfully assessed the interface Adhesion in aged and non-aged conditions, and can be used as a fast, easy and reliable test to study the long term durability in case of composite-metal bonded joints.

  • Adhesion Quality of steel cfrp interface bonding
    Proceedings of the Brazilian Conference on Composite Materials, 2016
    Co-Authors: S De Barros, Teixeira S De Freitas, S Budhe, Moreira M Arouche, B Dos L Santos
    Abstract:

    In this work, peel tests were used to assess the Adhesion Quality between carbon fiber reinforced polymers (CFRP) and carbon steel plates. The tests were performed according to the ASTM standard of floating roller peel tests (D3167–97) with a new specimen layup. The layup and geometry of specimens was defined in order to have the CFRP as the rigid substrate and the steel plate as a flexible substrate. The aim is to assess the Adhesion Quality of the interface in dry-conditions (short-term) and after ageing (long term). Specimens were inside the salt spray cabinet for 30 days to absorb the moisture. Results show that peel load are not significantly affected by the ageing condition. The specimens tested at dry-conditions and ageing condition showed a cohesive failure within the adhesive layer, which indicates a good Adhesion between the CFRP-Steel interfaces. Long term durability is suggested by keeping the specimen for longer duration in order to observe the degraded trend and Adhesion Quality of the joints.

Sofiane Amziane - One of the best experts on this subject based on the ideXlab platform.

  • influence of sunflower aggregates surface treatments on physical properties and Adhesion with a mineral binder
    Composites Part A-applied Science and Manufacturing, 2012
    Co-Authors: Vincent Nozahic, Sofiane Amziane
    Abstract:

    Abstract The engineering of ultra-lightweight lignocellulosic concretes has been considered from the point of view of mechanical, physical or thermal characteristics. Several works underlined interfaces as the weakest part of these composites. This study is devoted to the first interface creation step: the Adhesion process. Sunflower stem aggregate properties useful for the study of Adhesion are determined. The effects of one chemical treatment and two coatings are analyzed. A new technique to qualify aggregate/binder Adhesion during the binder structuring is experimented. Relationships are made between sunflower aggregate properties and Adhesion Quality. The results show the interest of the new Adhesion measurement technique. Ca(OH) 2 treatment, paraffin wax coating and 5 min water pre-wetting improved sunflower/binder interfacial shear stress respectively by 66.3%, 67% and 33%.

S Budhe - One of the best experts on this subject based on the ideXlab platform.

  • interface Adhesion assessment of composite to metal bonded joints under salt spray conditions using peel tests
    Composite Structures, 2017
    Co-Authors: Teixeira S De Freitas, Mariana D. Banea, S Budhe, S De Barros
    Abstract:

    An experimental study has been carried out to assess the Adhesion Quality of composite-to-metal bonded joints under salt spray ageing conditions. The tests were performed according to the ASTM standard of floating roller peel tests with a new specimen layup. The layup and geometry of the specimen was defined in order to have the Carbon Fiber Reinforced Polymer (CFRP) and carbon steel as the rigid and flexible substrate, respectively. Specimens were exposed to salt spray (or salt fog) for 30 and 90 days. The results show that the Adhesion performance (i.e. average peel load) of the joints progressively decreases with increasing the ageing time. The fracture surfaces of dry specimens (non-aged) exhibit a cohesive failure within the adhesive layer, which indicates a good Adhesion between the CFRP-steel interfaces. Interface degradation is indicated by a drop in peel load and adhesive failure. The percentage of adhesive failure increases with ageing times. Fracture surfaces of the adhesive failure exhibit deposition of NaCl crystal at the interface. Peel test successfully assessed the interface Adhesion in aged and non-aged conditions, and can be used as a fast, easy and reliable test to study the long term durability in case of composite-metal bonded joints.

  • Adhesion Quality of steel cfrp interface bonding
    Proceedings of the Brazilian Conference on Composite Materials, 2016
    Co-Authors: S De Barros, Teixeira S De Freitas, S Budhe, Moreira M Arouche, B Dos L Santos
    Abstract:

    In this work, peel tests were used to assess the Adhesion Quality between carbon fiber reinforced polymers (CFRP) and carbon steel plates. The tests were performed according to the ASTM standard of floating roller peel tests (D3167–97) with a new specimen layup. The layup and geometry of specimens was defined in order to have the CFRP as the rigid substrate and the steel plate as a flexible substrate. The aim is to assess the Adhesion Quality of the interface in dry-conditions (short-term) and after ageing (long term). Specimens were inside the salt spray cabinet for 30 days to absorb the moisture. Results show that peel load are not significantly affected by the ageing condition. The specimens tested at dry-conditions and ageing condition showed a cohesive failure within the adhesive layer, which indicates a good Adhesion between the CFRP-Steel interfaces. Long term durability is suggested by keeping the specimen for longer duration in order to observe the degraded trend and Adhesion Quality of the joints.