The Experts below are selected from a list of 609 Experts worldwide ranked by ideXlab platform

Mauro Ricotta - One of the best experts on this subject based on the ideXlab platform.

  • DAMAGE EVOLUTION IN COMPOSITE BONDED JOINTS UNDER FATIGUE LOADING
    2010
    Co-Authors: M. Lusiani, Giovanni Meneghetti, Marino Quaresimin, Mauro Ricotta
    Abstract:

    initiation, crack propagation The fatigue behaviour of single lap bonded joints under fatigue loading was already investigated and a suitable life prediction model was presented and validated [1-2]. The model is based on the actual damage evolution under fatigue load: a crack initiation followed by its propagation up to a critical length [2, 3]. In the present paper the evolution of fatigue damage in single lap joints is extensively analysed and discussed, with particular reference to the influence of layer orientation at adhesive-Adherend Interface, corner geometry at the end of the overlap area and load level. Single lap bonded joints were manufactured from autoclave-moulded laminates (Seal Texipreg CC206, T300 twill 2x2 carbon fibre fabric/ET442 toughened epoxy matrix) and bonded with a two-part epoxy adhesive 9323 B/A by 3M. The laminate lay-ups were [45/02]s and [452/0]s in order to have a 45 ° oriented layer at the adhesive Interface, whereas the previous joints [1,2] were obtained from [0]6 laminates. Different overlap lengths (20 and 40 mm) and corner geometry (square edge and fillet) were investigated under tension-tensio

  • influence of the Interface ply orientation on the fatigue behaviour of bonded joints in composite materials
    International Journal of Fatigue, 2010
    Co-Authors: Giovanni Meneghetti, Marino Quaresimin, Mauro Ricotta
    Abstract:

    Abstract The paper deals with the study of the fatigue behaviour of bonded joints in composite materials. The influence of the orientation of the composite layer at the adhesive–Adherend Interface is investigated on single lap joints prepared by carbon fabric/epoxy laminates bonded together with a two-part epoxy adhesive. Different laminate lay-ups ([45/02]s and [452/0]s), overlap lengths (20 and 40 mm) and corner geometry of bonded area (square edge and fillet, respectively) were investigated under tension–tension fatigue. Particular attention was devoted to the analysis of the fatigue damage evolution to identify initiation and subsequent growth of cracks. A previous model developed by the authors, for the prediction of the fatigue life of bonded joints as the sum of an initiation and propagation phase, was successfully applied to summarise the new data.

Hirotaka Igawa - One of the best experts on this subject based on the ideXlab platform.

  • dynamic strain distribution measurement and crack detection of an adhesive bonded single lap joint under cyclic loading using embedded fbg
    Smart Materials and Structures, 2014
    Co-Authors: Xiaoguang Ning, Kazuro Kageyama, Daichi Wada, Hideaki Murayama, Makoto Kanai, Isamu Ohsawa, Hirotaka Igawa
    Abstract:

    In this study, the dynamic strain distribution measurement of an adhesive-bonded single-lap joint was carried out in a cyclic load test using a fiber Bragg grating (FBG) sensor embedded into the adhesive/Adherend Interface along the overlap length direction. Unidirectional carbon fiber reinforced plastic (CFRP) substrates were bonded by epoxy resin to form the joint, and the FBG sensor was embedded into the surface of one substrate during its curing. The measurement was carried out with a sampling rate of 5 Hz by the sensing system, based on the optical frequency domain reflectometry (OFDR) throughout the test. A finite element analysis (FEA) was performed for the measurement evaluation using a three-dimensional model, which included the embedded FBG sensor. The crack detection method, based on the longitudinal strain distribution measurement, was introduced and performed to estimate the cracks that occurred at the adhesive/Adherend Interface in the test.

Till Vallee - One of the best experts on this subject based on the ideXlab platform.

  • adhesively bonded lap joints from pultruded gfrp profiles part i stress strain analysis and failure modes
    Composites Part B-engineering, 2005
    Co-Authors: Thomas Keller, Till Vallee
    Abstract:

    Quasi-static axial tension experiments were performed in a laboratory environment on epoxy bonded, balanced double-lap and single-lap joints from pultruded GFRP flat sections. Full-scale specimens were used to avoid size effects. Parameters investigated were the overlap length (from 50 to 200mm), the adhesive layer thickness (from 1 to 3mm) and the Adherend thickness (from 3 to 12mm). On nine of the double lap joints 40 strain gages were installed to measure the axial strain profiles along the overlaps. The measured axial strain profiles in the joints correlated well with numerical results obtained from a 2D finite element analysis. Failure initiation and progression were observed with a high-speed camera. Failure was initiated by the combination of local through-thickness tensile (peeling) and shear stresses at two different locations: in the adhesive fillet and in the outer fiber-mat layers of the Adherends below the joint edges. Failure propagation always occurred in the outer fiber-mat layers of the Adherends. The through-thickness strength of the adhesive-Adherend Interface was considerably higher than the through- thickness strength of the Interfaces between the fiber- mats. The experimental investigation showed that the ultimate failure load converged to a constant value with increasing overlap length. The adhesive layer thickness had an insignificant influence on the ultimate failure loads and the stress-strain distributions along the overlaps. [All rights reserved Elsevier]

Giovanni Meneghetti - One of the best experts on this subject based on the ideXlab platform.

  • DAMAGE EVOLUTION IN COMPOSITE BONDED JOINTS UNDER FATIGUE LOADING
    2010
    Co-Authors: M. Lusiani, Giovanni Meneghetti, Marino Quaresimin, Mauro Ricotta
    Abstract:

    initiation, crack propagation The fatigue behaviour of single lap bonded joints under fatigue loading was already investigated and a suitable life prediction model was presented and validated [1-2]. The model is based on the actual damage evolution under fatigue load: a crack initiation followed by its propagation up to a critical length [2, 3]. In the present paper the evolution of fatigue damage in single lap joints is extensively analysed and discussed, with particular reference to the influence of layer orientation at adhesive-Adherend Interface, corner geometry at the end of the overlap area and load level. Single lap bonded joints were manufactured from autoclave-moulded laminates (Seal Texipreg CC206, T300 twill 2x2 carbon fibre fabric/ET442 toughened epoxy matrix) and bonded with a two-part epoxy adhesive 9323 B/A by 3M. The laminate lay-ups were [45/02]s and [452/0]s in order to have a 45 ° oriented layer at the adhesive Interface, whereas the previous joints [1,2] were obtained from [0]6 laminates. Different overlap lengths (20 and 40 mm) and corner geometry (square edge and fillet) were investigated under tension-tensio

  • influence of the Interface ply orientation on the fatigue behaviour of bonded joints in composite materials
    International Journal of Fatigue, 2010
    Co-Authors: Giovanni Meneghetti, Marino Quaresimin, Mauro Ricotta
    Abstract:

    Abstract The paper deals with the study of the fatigue behaviour of bonded joints in composite materials. The influence of the orientation of the composite layer at the adhesive–Adherend Interface is investigated on single lap joints prepared by carbon fabric/epoxy laminates bonded together with a two-part epoxy adhesive. Different laminate lay-ups ([45/02]s and [452/0]s), overlap lengths (20 and 40 mm) and corner geometry of bonded area (square edge and fillet, respectively) were investigated under tension–tension fatigue. Particular attention was devoted to the analysis of the fatigue damage evolution to identify initiation and subsequent growth of cracks. A previous model developed by the authors, for the prediction of the fatigue life of bonded joints as the sum of an initiation and propagation phase, was successfully applied to summarise the new data.

Xiaoguang Ning - One of the best experts on this subject based on the ideXlab platform.

  • dynamic strain distribution measurement and crack detection of an adhesive bonded single lap joint under cyclic loading using embedded fbg
    Smart Materials and Structures, 2014
    Co-Authors: Xiaoguang Ning, Kazuro Kageyama, Daichi Wada, Hideaki Murayama, Makoto Kanai, Isamu Ohsawa, Hirotaka Igawa
    Abstract:

    In this study, the dynamic strain distribution measurement of an adhesive-bonded single-lap joint was carried out in a cyclic load test using a fiber Bragg grating (FBG) sensor embedded into the adhesive/Adherend Interface along the overlap length direction. Unidirectional carbon fiber reinforced plastic (CFRP) substrates were bonded by epoxy resin to form the joint, and the FBG sensor was embedded into the surface of one substrate during its curing. The measurement was carried out with a sampling rate of 5 Hz by the sensing system, based on the optical frequency domain reflectometry (OFDR) throughout the test. A finite element analysis (FEA) was performed for the measurement evaluation using a three-dimensional model, which included the embedded FBG sensor. The crack detection method, based on the longitudinal strain distribution measurement, was introduced and performed to estimate the cracks that occurred at the adhesive/Adherend Interface in the test.