The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform

B Zuccarello - One of the best experts on this subject based on the ideXlab platform.

  • local reinforcement effect of a Strain Gauge Installation on low modulus materials
    Journal of Strain Analysis for Engineering Design, 2005
    Co-Authors: Augusto Ajovalasit, B Zuccarello
    Abstract:

    The reinforcement effect of electrical resistance Strain Gauges is well documented in the technical literature. In this paper the local reinforcement effect in tension is studied by using a simple theoretical model by considering a Strain Gauge mounted on a semi-infinite plate having the same width of the Strain Gauge and subjected to a uniaxial tension load. Neglecting the effect of the adhesive layer and considering the interface shear stress as an exponential distribution, the proposed model gives a closed-form solution. In detail, this model permits a simple formula to be obtained which allows the user to correct the local reinforcement effect provided that a proper calibration is performed by installing a Strain Gauge, of the same type as that used on the structure, on a low modulus material. Experimental evidence of the proposed method is shown. Experimental proof of the positive effect of large grid lengths on the local reinforcement effect is also reported.

Augusto Ajovalasit - One of the best experts on this subject based on the ideXlab platform.

  • local reinforcement effect of a Strain Gauge Installation on low modulus materials
    Journal of Strain Analysis for Engineering Design, 2005
    Co-Authors: Augusto Ajovalasit, B Zuccarello
    Abstract:

    The reinforcement effect of electrical resistance Strain Gauges is well documented in the technical literature. In this paper the local reinforcement effect in tension is studied by using a simple theoretical model by considering a Strain Gauge mounted on a semi-infinite plate having the same width of the Strain Gauge and subjected to a uniaxial tension load. Neglecting the effect of the adhesive layer and considering the interface shear stress as an exponential distribution, the proposed model gives a closed-form solution. In detail, this model permits a simple formula to be obtained which allows the user to correct the local reinforcement effect provided that a proper calibration is performed by installing a Strain Gauge, of the same type as that used on the structure, on a low modulus material. Experimental evidence of the proposed method is shown. Experimental proof of the positive effect of large grid lengths on the local reinforcement effect is also reported.

Min-ho Kwon - One of the best experts on this subject based on the ideXlab platform.

  • Fatigue Evaluation of a Steel Bridge in Service through Stress History Measurement and Consideration of Stress Category
    Journal of the Korea institute for structural maintenance and inspection, 2014
    Co-Authors: Sung-ok Na, Min-ho Kwon
    Abstract:

    Sung-Ok Na Min-Ho Kwon Cheol-Jun Cha In-ho KimAbstractThe proper stress history measurement should be conducted in order to examine the accurate cause of fatigue cracks or the fatigue safety in the steel bridge. Only one Strain Gauge is generally installed in the field for the stress history examination because of the field circumstances, economic feasibility, workability, and so on. However, this method may not consider the actual size ofthe specific structure, the Gauge length, and the affect of stress concentration in the welded joint. In addition, it is difficult to applyfor the stress analysis. Therefore, this study suggests improvements that are a great number of Gauge Installations, the Gauge location adjustment, and the use of the minimum length Gauge. It is drived the correlative equation of Strain for the distance between the welding toe and the Strain Gauge Installation, and compare correlative equation with equation of IIW. Also, this studycould estimate the remaining life and fatigue damage of bridge in service by selecting the suitable stress category. In conclusion, it is possible to understand the member which is high in the fatigue cracks, and the quantitative relations between the welding toeand the Strain Gauge Installation distances. The proposed approach in this study can make an more accurate fatigue damage and a remaining life prediction so that the improved method should be applied in measuring the Strain of bridges from now on.Keywords : Improved method, Correlative equation, Stress category, Fatigue damage, Remaining life

P N Joshi - One of the best experts on this subject based on the ideXlab platform.

  • Strain-Gauge Applications in Wind Tunnel Balances
    Iete Technical Review, 1992
    Co-Authors: P N Joshi
    Abstract:

    Aerodynamic forces and moments acting on scaled models of aircraft and missiles are generally measured by a multi-component transducer called the ‘Internal Strain Gauge Balance.’ This multi-component transducer which fits inside the model, incorporates six specially machined elements to measure three components of forces and three components of moments on the model. The air loads on the elements appear as Strain, which is measured by resistance Strain Gauge transducers. The paper describes two variants of six-component balance configurations, Strain Gauge Installation procedure, thermal performance, typical calibration and operational of Strain-Gauge balance in wind tunnel test applications.

Sung-ok Na - One of the best experts on this subject based on the ideXlab platform.

  • Fatigue Evaluation of a Steel Bridge in Service through Stress History Measurement and Consideration of Stress Category
    Journal of the Korea institute for structural maintenance and inspection, 2014
    Co-Authors: Sung-ok Na, Min-ho Kwon
    Abstract:

    Sung-Ok Na Min-Ho Kwon Cheol-Jun Cha In-ho KimAbstractThe proper stress history measurement should be conducted in order to examine the accurate cause of fatigue cracks or the fatigue safety in the steel bridge. Only one Strain Gauge is generally installed in the field for the stress history examination because of the field circumstances, economic feasibility, workability, and so on. However, this method may not consider the actual size ofthe specific structure, the Gauge length, and the affect of stress concentration in the welded joint. In addition, it is difficult to applyfor the stress analysis. Therefore, this study suggests improvements that are a great number of Gauge Installations, the Gauge location adjustment, and the use of the minimum length Gauge. It is drived the correlative equation of Strain for the distance between the welding toe and the Strain Gauge Installation, and compare correlative equation with equation of IIW. Also, this studycould estimate the remaining life and fatigue damage of bridge in service by selecting the suitable stress category. In conclusion, it is possible to understand the member which is high in the fatigue cracks, and the quantitative relations between the welding toeand the Strain Gauge Installation distances. The proposed approach in this study can make an more accurate fatigue damage and a remaining life prediction so that the improved method should be applied in measuring the Strain of bridges from now on.Keywords : Improved method, Correlative equation, Stress category, Fatigue damage, Remaining life