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  • Open Access

    ARTICLE

    Structural Response of Composite Panels with a Bonded Patch Repair Using Full-Field Measurement

    Sameer Hamoush1, Kunigal Shivakumar2, Ibraheem Kateeb3
    Structural Longevity, Vol.10, No.3, pp. 135-141, 2013, DOI:10.3970/sl.2013.010.135
    Abstract This paper presents an experimental/analytical evaluation of patch repair of solid laminated composites. The experimental program was focused on destructive evaluation of full-scale repaired panels under static tension loading conditions using speckle test full-field image recording technology. The speckle test results were used to validate a finite element analytical model. Based on the evaluation performed in this study, the finite element model and the speckle imaging technology provide major enhancements in understanding the performance of the scarf repairs. More >

  • Open Access

    ARTICLE

    Identification of Parameters of a Nonlinear Material Model Considering the Effects of Viscoelasticity and Damage

    J. Heczko1, R. Kottner2, T. Kroupa2
    Structural Longevity, Vol.10, No.3, pp. 143-149, 2013, DOI:10.3970/sl.2013.010.143
    Abstract This work deals with mechanical properties of a rubber material that is used in modern tram wheels as a damping element. Nonlinear static response as well as strain softening and hysteresis are captured in the material model. The identification method of the model’s parameters is developed. The identification method relies on successive minimizations with respect to different sets of parameters. The identification of the parameters of the material model is based on the tensile and compressive experimental data. Shear data are used for validation. More >

  • Open Access

    ARTICLE

    Evaluation of Fatigue Remaining Life of Typical steel plate girder Bridge under Railway Loading

    N. K. Banjara1, S. Sasmal2
    Structural Longevity, Vol.10, No.3, pp. 151-166, 2013, DOI:10.3970/sl.2013.010.151
    Abstract This paper presents various fatigue damage models available in the literature for calculating the damage index due to fatigue loading. Discussion on the effect of load level, load sequence and load interaction on the fatigue damage of the bridges is also presented. Experimental studies conducted to obtain the strain responses at the different critical sections of a typical steel plate girder bridge under railway loadings are briefly described. Strain time histories obtained at different locations including at the weld zone are used to evaluate the fatigue remaining life of the bridge considered in this study. Load spectrum is developed by… More >

  • Open Access

    ARTICLE

    New Evaluation Method of Fracture Permeability Based on Stoneley Wave Data and Electric Imaging Log in Tight Fractured Sandstone Reservoir

    Fuming Zhang1, Guangquan Zheng2, Yongping Wu2
    Structural Longevity, Vol.10, No.3, pp. 167-176, 2013, DOI:10.3970/sl.2013.010.167
    Abstract Quantitative evaluation of fracture permeability is one of difficulties in log interpretation. In recent years, more and more well-logging new technology, such as electrical imaging logging and array sonic logging were widely applied in complex reservoirs evaluation, and also, provided great help in calculating fracture permeability. But, one of the most difficult questions in fracture permeability modeling is how to acquire physical fracture permeability samples, which would be used to calibrate the empirical model. Commonly, the physical fracture permeability samples can be gained from full diameter cores analysis, or interpretation results from formation testing data. But unfortunately, this kind of… More >

  • Open Access

    ARTICLE

    Active Control of a Reduced Model of a Smart Structure

    N. Ghareeb1, R. Schmidt1
    Structural Longevity, Vol.10, No.3, pp. 177-199, 2013, DOI:10.3970/sl.2013.010.177
    Abstract Control of vibration plays an important role in the performance of mechanical systems. Moreover, the advances in active materials have made it possible to integrate sensing, actuation and control of unwanted vibration in the design of the structure. In this work, a linear control system based on the Lyapunov stability theorem is used to attenuate the vibration of a cantilevered smart beam excited by its first eigenmode. An optimal finite element (FE) model of the smart beam is created with the help of experimental data. This model is then reduced to a super element (SE) model containing a finite number… More >

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