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    ARTICLE

    Structural Integrity of Main Heat Transport System Piping of AHWR

    K.K. Vaze1
    Structural Longevity, Vol.3, No.2, pp. 87-109, 2010, DOI:10.3970/sl.2010.003.087
    Abstract Advanced Heavy Water Reactor (AHWR) is a 920 MWth, 300 MWe vertical pressure tube type reactor, which uses boiling light water as a coolant in a high-pressure main heat transport (MHT) system. Structural integrity considerations have been a part of the design process right from selection of material. Among the various degradation mechanisms, low temperature sensitization and low temperature embrittlement were considered to be the life limiting material degradation mechanisms: In view of the proposed 100 year life of AHWR, these issues need to be addressed in a thorough manner. SS 304LN has been chosen based on its satisfactory low… More >

  • Open Access

    ARTICLE

    Ultrasonic Characterization of Damage in Concrete

    Manu Santhanam1
    Structural Longevity, Vol.3, No.2, pp. 111-125, 2010, DOI:10.3970/sl.2010.003.111
    Abstract Ultrasonic non-destructive evaluation is an essential component of condition assessment of concrete. Conventionally, the use of ultrasonics is limited to the study of velocity of sound through concrete. The velocity is qualitatively linked to the condition of the concrete in service. However, sophistication in signal processing has led to the development of better ultrasonic techniques that can give some quantitative estimates of the damage. This paper describes the use of the transmitted ultrasonic energy to estimate the level of damage in concrete under uniaxial compression. The experimental set up was designed to collect ultrasonic signals between transducers at opposite ends… More >

  • Open Access

    ARTICLE

    A New Damage Mechanics Based Approach for Integrity Assessment of Plant Components

    M. K. Samal1
    Structural Longevity, Vol.3, No.2, pp. 127-153, 2010, DOI:10.3970/sl.2010.003.127
    Abstract Safety analysis of critical components and the overall plant is a major and important task in the field of mechanical engineering. Therefore, it is essential to know the allowable loads and the corresponding failure behaviour (e.g., crack initiation, growth and instability) of the component. The damage mechanics approaches which incorporate the microscopic processes of ductile fracture (i.e., void nucleation, growth and coalescence) into the material constitutive behaviour has been very successful in predicting the ductile crack propagation in specimens and components irrespective of their geometry, loading types etc. The major drawback of these models is the requirement of a pre-defined… More >

  • Open Access

    ARTICLE

    Integrity of Sub-Structural Systems during Earthquake: Indian and International Perspectives

    Deepankar Choudhury1
    Structural Longevity, Vol.3, No.2, pp. 155-170, 2010, DOI:10.3970/sl.2010.003.155
    Abstract Structural integrity of underground constructions or sub-structures like foundations, anchors, basements, piles, piers, abutments, retaining walls, subgrade of railway, highway, airport runway etc. are important concern for the engineers and researchers in the entire world to advance on the infrastructural developments of any country. Several historical giant earthquakes all over the world had always put the researchers and engineers to the new challenge for developing advanced and new techniques of design and construction to maintain the structural integrity of the infrastructural systems. In this paper, the state-of-the-art type analysis and design techniques for behavior of such sub-structural system during seismic… More >

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