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Author: search.filters.author.Udupa, K.R.Subject: search.filters.subject.Creep

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    Investigation into creep behaviour of Sn-40%Pb alloy using impression creep method
    (2009) Udaya Prasanna, H.U.; Udupa, K.R.; Prabhu, K.N.
    The creep behaviour of Sn-40%Pb hypereutectic alloys cast in the molds made of different materials was investigated using impression creep technique in the temperature range from zero to 32 °C and under the punching stress of 50 MPa. The creep curves.ie, profiles of indentation depth against time are generated and steady state creep rates (SSCRs) are determined. Activation energy was calculated knowing creep rates at different temperature levels. Standard metallographic technique was used to determine the grain size of alloys which were poured into different molds. It was found that SSCR, at all the temperature levels of testing, is a function of grain size of the material. The activation energy being in the range of 10kJ/mol -12 kJ/mol, suggests that the probable creep mechanism is dislocation glide aided by vacancy diffusion. Results of the experiments are discussed.
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    Indentation creep studies to evaluate the mechanical properties of stainless steel welds
    (Taylor and Francis Ltd. michael.wagreich@univie.ac.at, 2016) Udaya Prasanna, H.U.; Udupa, K.R.
    Size being limited for preparing standard specimens for mechanical tests, the weld poses problems to researchers and scientists in estimating the strength parameters and workhardening coefficients. The integrity of the weld is difficult to probe into, particularly when the temperature of operation is much higher than the room temperature. The indentation creep test route is successfully tried by the authors to present a detailed commentary on the mechanical properties of a stainless steel weld at different test temperatures using a methodology whereby the creep test results are correlated to the compression test results and correlation equations developed. As the indentation creep tests can be carried out on a small-sized sample, the method enables one to carry out only this test to judge the mechanical properties of the welds. © 2015 Engineers Australia.