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Xu Jiang – One of the best experts on this subject based on the ideXlab platform.

  • Analysis on AdhesivelyBonded Joints of FRP-steel Composite Bridge under Combined Loading: Arcan Test Study and Numerical Modeling
    Polymers, 2016
    Co-Authors: Xu Jiang, Xuhong Qiang, Henk Kolstein, Frans S.k. Bijlaard
    Abstract:

    The research presented in this paper is an experimental study and numerical analysis on mechanical behavior of the AdhesivelyBonded Joint between FRP sandwich bridge deck and steel girder. Generally, there are three typical stress states in the AdhesivelyBonded Joint: shear stress, tensile stress, and combination of both. To realize these stress states in the AdhesivelyBonded Joint during tests, a specific loading device is developed with the capacity of providing six different loading angles, which are 0°(pure tension), 18°, 36°, 54°, 72° and 90°(pure shear). Failure modes of AdhesivelyBonded Joints are investigated. It indicates that, for the pure shear loading, the failure mode is the cohesive failure (near the interface between the adhesive layer and the steel support) in the adhesive layer. For the pure tensile and combined loading conditions, the failure mode is the combination of fiber breaking, FRP delamination and interfacial adhesion failure between the FRP sandwich deck and the adhesive layer. The load-bearing capacities of adhesive Joints under combined loading are much lower than those of the pure tensile and pure shear loading conditions. According to the test results of six angle loading conditions, a tensile/shear failure criterion of the AdhesivelyBonded Joint is obtained. By using Finite Element (FE) modeling method, linear elastic simulations are performed to characterize the stress distribution throughout the AdhesivelyBonded Joint.

  • experimental investigation on mechanical behaviour of frp to steel Adhesively Bonded Joint under combined loading part 2 after hygrothermal ageing
    Composite Structures, 2015
    Co-Authors: Xu Jiang, M H Kolstein, X Qiang, F S K Bijlaard
    Abstract:

    Abstract This paper presents the second part of the research project, focusing on the mechanical behaviours of the FRP-to-steel AdhesivelyBonded joins after hygrothermal ageing. To investigate the moisture and temperature effects on mechanical degrdegradation of Adhesively-boned Joints, the adhesive Joint specimens were immerged in a hot/wet environment (40 °C water condition) for 4 months. After hygrothermal ageing, series of loading tests under six angle loading conditions were conducted by employing the specific tensile/shear loading device (developed in Part 1, the companion of this paper). Mechanical behaviours of aged adhesive Joints were studied and compared with the un-aged adhesive Joints (results of Part 1), regarding to failure modes, ultimate failure loads, stiffness as well as tensile–shear failure criterion. It revealed that the hygrothermal ageing significantly decreased the ultimate failure loads of aged adhesive Joints under shear and tensile loading. However, for the tensile/shear combined loading, the environmental degradation was not that obvious. The failure criterion curves of un-aged and aged adhesive Joints were close to each other. The stiffness of adhesive Joints was significantly influenced by the hygrothermal ageing under all six loading conditions. With regard to the failure modes, for the tensile and tensile/shear combined loading conditions, the hygrothermal ageing switched the failure mode of adhesive Joints, from the partial interfacial failure between the FRP sandwich deck and the adhesive layer to the full FRP delamination in FRP laminates and fully covered fibre breaking area. For the shear loading condition, the same failure mode (cohesive fracture in the adhesive layer) was obtained before and after the four-month hygrothermal ageing.

  • experimental and numerical study on mechanical behavior of an Adhesively Bonded Joint of frp steel composite bridge under shear loading
    Composite Structures, 2014
    Co-Authors: Xu Jiang, M H Kolstein, F S K Bijlaard
    Abstract:

    Abstract Due to the composite action between the Fiber-Reinforced PolyPolymer (FRP) decks and steel girders, the deck and girder tend to bend together to carry the loading, which induce the shear stress in the AdhesivelyBonded Joint between them. This paper presents an experimental and numerical study of the AdhesivelyBonded Joint under shear loading. The experimental study shows that the average ultimate failure load of specimens pretreated by using sand paper and sand blasting is more than three times of that of specimens pretreated by only using acetone. Further comparison on failure modes confirms that the sufficient surface pretreatment can improve the bonding quality between the adhesive layer and the steel support. Subsequently, a three dimensional Finite Element (FE) numerical model is developed using ABAQUS 6.8. The FE analysis results are validated by experimental works, focusing on the shear deformational response of the AdhesivelyBonded Joints. With the validated FE model, three-dimensional nature of the stress distribution and stress singularity at the interface between the adhesive layer and the steel support are investigated. Further study is performed on the mesh density of the FE model, to investigate the mesh dependence of stress distribution.

F S K Bijlaard – One of the best experts on this subject based on the ideXlab platform.

  • experimental investigation on mechanical behaviour of frp to steel Adhesively Bonded Joint under combined loading part 2 after hygrothermal ageing
    Composite Structures, 2015
    Co-Authors: Xu Jiang, M H Kolstein, X Qiang, F S K Bijlaard
    Abstract:

    Abstract This paper presents the second part of the research project, focusing on the mechanical behaviours of the FRP-to-steel AdhesivelyBonded joins after hygrothermal ageing. To investigate the moisture and temperature effects on mechanical degradation of Adhesively-boned Joints, the adhesive Joint specimens were immerged in a hot/wet environment (40 °C water condition) for 4 months. After hygrothermal ageing, series of loading tests under six angle loading conditions were conducted by employing the specific tensile/shear loading device (developed in Part 1, the companion of this paper). Mechanical behaviours of aged adhesive Joints were studied and compared with the un-aged adhesive Joints (results of Part 1), regarding to failure modes, ultimate failure loads, stiffness as well as tensile–shear failure criterion. It revealed that the hygrothermal ageing significantly decreased the ultimate failure loads of aged adhesive Joints under shear and tensile loading. However, for the tensile/shear combined loading, the environmental degradation was not that obvious. The failure criterion curves of un-aged and aged adhesive Joints were close to each other. The stiffness of adhesive Joints was significantly influenced by the hygrothermal ageing under all six loading conditions. With regard to the failure modes, for the tensile and tensile/shear combined loading conditions, the hygrothermal ageing switched the failure mode of adhesive Joints, from the partial interfacial failure between the FRP sandwich deck and the adhesive layer to the full FRP delamination in FRP laminates and fully covered fibre breaking area. For the shear loading condition, the same failure mode (cohesive fracture in the adhesive layer) was obtained before and after the four-month hygrothermal ageing.

  • experimental and numerical study on mechanical behavior of an Adhesively Bonded Joint of frp steel composite bridge under shear loading
    Composite Structures, 2014
    Co-Authors: Xu Jiang, M H Kolstein, F S K Bijlaard
    Abstract:

    Abstract Due to the composite action between the Fiber-Reinforced Polymer (FRP) decks and steel girders, the deck and girder tend to bend together to carry the loading, which induce the shear stress in the AdhesivelyBonded Joint between them. This paper presents an experimental and numerical study of the AdhesivelyBonded Joint under shear loading. The experimental study shows that the average ultimate failure load of specimens pretreated by using sand paper and sand blasting is more than three times of that of specimens pretreated by only using acetone. Further comparison on failure modes confirms that the sufficient surface pretreatment can improve the bonding quality between the adhesive layer and the steel support. Subsequently, a three dimensional Finite Element (FE) numerical model is developed using ABAQUS 6.8. The FE analysis results are validated by experimental works, focusing on the shear deformational response of the AdhesivelyBonded Joints. With the validated FE model, three-dimensional nature of the stress distribution and stress singularity at the interface between the adhesive layer and the steel support are investigated. Further study is performed on the mesh density of the FE model, to investigate the mesh dependence of stress distribution.

  • study on mechanical behaviors of frp to steel Adhesively Bonded Joint under tensile loading
    Composite Structures, 2013
    Co-Authors: Xu Jiang, M H Kolstein, F S K Bijlaard
    Abstract:

    Abstract Due to various advantages of Fiber–Reinforced PolyPolymer (FRP) decks, the FRP to steel composite girder system is being increasingly used in new bridge constructions as well as rehabilitation projects for old bridges. This paper focuses on the mechanical behavior and failure mode of the AdhesivelyBonded joins between FRP sandwich decks and steel girders. The AdhesivelyBonded Joints were experimentally investigated under tensile loading. The average ultimate failure load of surface pretreated specimens was 17.62 kN, which was 9.83% higher than that of un-pretreated specimens. Further comparison on failure modes confirmed that the surface pretreatment can improve the bonding quality between FRP composites and adhesive layer, and the failure load of the adhesive Joint closely related to the FRP delamination area. Furthermore, a 3D numerical modeling was conducted using ABAQUS 6.8. The Finite Element Analysis (FEA) results were validated with experimental works focused on the deformational response of the Adhesively Bonded Joints. The results of FEA highlight the three-dimensional nature of the stress distribution and stress concentrations at the interface between FRP sandwich deck and adhesive layer.

Farid Taheri – One of the best experts on this subject based on the ideXlab platform.

  • stress analysis of tubular adhesive Joints with delaminated adherend
    Journal of Adhesion Science and Technology, 2009
    Co-Authors: Ramadan A Esmaeel, Farid Taheri
    Abstract:

    The use of adhesive Joints is becoming increasingly important in aerospace, automotive and other industries where the use of traditional fasteners is discouraged. When using composite adherends, the use of Adhesively Bonded Joints is preferable rather than the traditional bolts and other types of fasteners, because they do not require holes, thereby removing the problems of stress concentrations around the holes. However, when using an Adhesively Bonded Joint, there will be concentrations of the distributions of shear and peel stresses within the adhesive layer which should be controlled effectively. Therefore, the investigation of such stress variation has attracted many researchers. The aforementioned stress distributions become more complicated if the composite adherend contains a pre-existing delamination. Delamination is one of the most common failure modes in laminated composite materials; it can occur due to sudden impact by an external object, during the manufacturing process (e.g., during the fil…

  • Strength improvement of a smart adhesive Bonded Joint system by partially integrated piezoelectric patches
    Journal of Adhesion Science and Technology, 2006
    Co-Authors: Jinquan Cheng, Farid Taheri, Haipeng Han
    Abstract:

    In order to reduce the stress concentration in the adhesive layer of an Adhesively Bonded Joint, a smart adhesive Joint system was developed by integration of piezoelectric sensors/actuators patches, Bonded to the surfaces of the adherends, near the ends of the Joint area. By adjusting the applied electric field on the piezoelectric layer in the developed smart Joint system, one can produce additional forces and moments which would act oppositely to those developed internally, thereby alleviating the stress concentration in the Joint edges. This would, in turn, improve the performance of the Adhesively Bonded Joint. In our work, the strength enhancement of the developed smart Bonded Joint system was first evaluated by an experimental investigation. In addition, a theoretical analysis model was developed for predicting the effect of the applied electric field on the surface-Bonded piezoelectric patches.

  • a novel smart Adhesively Bonded Joint system
    Smart Materials and Structures, 2005
    Co-Authors: Jinquan Cheng, Farid Taheri
    Abstract:

    A new smart adhesive Joint system was developed by integrating (surface bonding) electromechanical piezoelectric patches. The bending moments in this Joint system could be adaptively controlled by adjusting the electric field applied to the surface Bonded piezoelectric patches. As a result, the stress distribution in the adhesive layer is more uniformly redistributed, thus reducing the stress concentration in the ends of the interface bond line. A detailed theoretical model was developed for the analysis of a single-strap adhesive Joint system to study the influence of the surface bonding of piezoelectric patches and the distribution of the stress in the adhesive layer. The integrity of the proposed solution was verified by analyzing the Joint with a finite element method. The comparison of the results demonstrated the viability of the proposed smart Joint system, as well as validating the accuracy of our proposed solution.

E Roguet – One of the best experts on this subject based on the ideXlab platform.

  • a model of an Adhesively Bonded Joint with elastic plastic adherends and a softening adhesive
    Computer Methods in Applied Mechanics and Engineering, 2009
    Co-Authors: Ulf Edlund, Peter Schmidt, E Roguet
    Abstract:

    Abstract This paper deals with the generalization of a model of an Adhesively Bonded Joint with the aim to allow elastic–plastic adherends. In the model of the Joint that we extend, the thinness of the bodies and the low Young’s modulus of the adhesive were used to obtain a simplified model where the parts are described as material surfaces. We formulate an elastic–plastic material model with isotropic hardening expressed in the generalized stress and strain measures used for the surface description of the Joint. The finite element formulation and the numerical treatment of the constitutive law are discussed. Numerical results showing the accuracy of the proposed treatment of the adherends are presented. Two failure load computations, using a softening material model for the adhesive, are presented and compared with experiments. The results show the importance of taking into account potential plastic deformations in the adherends in failure load computations.

  • A model of an Adhesively Bonded Joint with elastic–plastic adherends and a softening adhesive
    Computer Methods in Applied Mechanics and Engineering, 2008
    Co-Authors: Ulf Edlund, Peter Schmidt, E Roguet
    Abstract:

    Abstract This paper deals with the generalization of a model of an Adhesively Bonded Joint with the aim to allow elastic–plastic adherends. In the model of the Joint that we extend, the thinness of the bodies and the low Young’s modulus of the adhesive were used to obtain a simplified model where the parts are described as material surfaces. We formulate an elastic–plastic material model with isotropic hardening expressed in the generalized stress and strain measures used for the surface description of the Joint. The finite element formulation and the numerical treatment of the constitutive law are discussed. Numerical results showing the accuracy of the proposed treatment of the adherends are presented. Two failure load computations, using a softening material model for the adhesive, are presented and compared with experiments. The results show the importance of taking into account potential plastic deformations in the adherends in failure load computations.

M H Kolstein – One of the best experts on this subject based on the ideXlab platform.

  • experimental investigation on mechanical behaviour of frp to steel Adhesively Bonded Joint under combined loading part 2 after hygrothermal ageing
    Composite Structures, 2015
    Co-Authors: Xu Jiang, M H Kolstein, X Qiang, F S K Bijlaard
    Abstract:

    Abstract This paper presents the second part of the research project, focusing on the mechanical behaviours of the FRP-to-steel AdhesivelyBonded joins after hygrothermal ageing. To investigate the moisture and temperature effects on mechanical degradation of Adhesively-boned Joints, the adhesive Joint specimens were immerged in a hot/wet environment (40 °C water condition) for 4 months. After hygrothermal ageing, series of loading tests under six angle loading conditions were conducted by employing the specific tensile/shear loading device (developed in Part 1, the companion of this paper). Mechanical behaviours of aged adhesive Joints were studied and compared with the un-aged adhesive Joints (results of Part 1), regarding to failure modes, ultimate failure loads, stiffness as well as tensile–shear failure criterion. It revealed that the hygrothermal ageing significantly decreased the ultimate failure loads of aged adhesive Joints under shear and tensile loading. However, for the tensile/shear combined loading, the environmental degradation was not that obvious. The failure criterion curves of un-aged and aged adhesive Joints were close to each other. The stiffness of adhesive Joints was significantly influenced by the hygrothermal ageing under all six loading conditions. With regard to the failure modes, for the tensile and tensile/shear combined loading conditions, the hygrothermal ageing switched the failure mode of adhesive Joints, from the partial interfacial failure between the FRP sandwich deck and the adhesive layer to the full FRP delamination in FRP laminates and fully covered fibre breaking area. For the shear loading condition, the same failure mode (cohesive fracture in the adhesive layer) was obtained before and after the four-month hygrothermal ageing.

  • experimental and numerical study on mechanical behavior of an Adhesively Bonded Joint of frp steel composite bridge under shear loading
    Composite Structures, 2014
    Co-Authors: Xu Jiang, M H Kolstein, F S K Bijlaard
    Abstract:

    Abstract Due to the composite action between the Fiber-Reinforced Polymer (FRP) decks and steel girders, the deck and girder tend to bend together to carry the loading, which induce the shear stress in the AdhesivelyBonded Joint between them. This paper presents an experimental and numerical study of the AdhesivelyBonded Joint under shear loading. The experimental study shows that the average ultimate failure load of specimens pretreated by using sand paper and sand blasting is more than three times of that of specimens pretreated by only using acetone. Further comparison on failure modes confirms that the sufficient surface pretreatment can improve the bonding quality between the adhesive layer and the steel support. Subsequently, a three dimensional Finite Element (FE) numerical model is developed using ABAQUS 6.8. The FE analysis results are validated by experimental works, focusing on the shear deformational response of the AdhesivelyBonded Joints. With the validated FE model, three-dimensional nature of the stress distribution and stress singularity at the interface between the adhesive layer and the steel support are investigated. Further study is performed on the mesh density of the FE model, to investigate the mesh dependence of stress distribution.

  • study on mechanical behaviors of frp to steel Adhesively Bonded Joint under tensile loading
    Composite Structures, 2013
    Co-Authors: Xu Jiang, M H Kolstein, F S K Bijlaard
    Abstract:

    Abstract Due to various advantages of Fiber–Reinforced Polymer (FRP) decks, the FRP to steel composite girder system is being increasingly used in new bridge constructions as well as rehabilitation projects for old bridges. This paper focuses on the mechanical behavior and failure mode of the AdhesivelyBonded joins between FRP sandwich decks and steel girders. The AdhesivelyBonded Joints were experimentally investigated under tensile loading. The average ultimate failure load of surface pretreated specimens was 17.62 kN, which was 9.83% higher than that of un-pretreated specimens. Further comparison on failure modes confirmed that the surface pretreatment can improve the bonding quality between FRP composites and adhesive layer, and the failure load of the adhesive Joint closely related to the FRP delamination area. Furthermore, a 3D numerical modeling was conducted using ABAQUS 6.8. The Finite Element Analysis (FEA) results were validated with experimental works focused on the deformational response of the Adhesively Bonded Joints. The results of FEA highlight the three-dimensional nature of the stress distribution and stress concentrations at the interface between FRP sandwich deck and adhesive layer.