Browsing by Author "Sharma J."

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    Fiber cantilever based acoustic sensor
    (2017) Dass S.; Halder S.; Sharma J.; Jha R.
    A low-cost high sensitivity SMF micro tip in cantilever configuration based acoustic sensor is demonstrated. For cantilever length of 11.2 mm, sensor shows a linear response in frequency range of 100-600 Hz. � OSA 2017.
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    Impression creep behaviour of TiB2 particles reinforced steel matrix composites
    (2018) Sahoo S.; Jha B.B.; Mahata T.S.; Sharma J.; Murthy T.S.R.C.; Mandal A.
    Impression creep behaviour of the powder metallurgy processed steel matrix composites was investigated under constant stress at different temperatures in the range of 873�973 K. By using the power-law relationship, the estimated activation energy for unreinforced steel was found to be 149 kJ mol?1 and steel reinforced with 2 and 4 vol.-% TiB2 was found to be 298 and 338 kJ mol?1, respectively indicating better creep resistance of the reinforced steel matrix composites. Dislocation creep is the dominant creep mechanism based on the calculated values of stress exponent and activation energy. Hence, this method can be used to assess the potential of steel matrix composites for use as structural materials for high-temperature application. � 2018, � 2018 Institute of Materials, Minerals and Mining.
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    Mechanical and Wear Behaviour of Hot-Pressed 304 stainless Steel Matrix Composites Containing TiB 2 Particles
    (2019) Sahoo S.; Jha B.B.; Mahata T.; Sharma J.; Murthy T.S.R.C.; Mandal A.
    In the present article, mechanical and wear behaviour of hot-pressed 304 stainless steel matrix composites containing 2 and 4�vol% TiB 2 particles was investigated. A density of over 92% was achieved at optimum hot-pressing temperature and TiB 2 particles� content. Microhardness and yield strength of the composites were found to be improved remarkably as compared to their unreinforced counterpart. The enhancement of mechanical properties of the composites was discussed in light of their microstructural aspects and different possible strengthening mechanism models. Taylor strengthening was found to be dominant strengthening mechanism as compared to Orowan strengthening and load-bearing effect. Dry sliding wear behaviour was also investigated under load of 35�N at sliding speed 0.3�m/s. The wear resistance of the composites was found to be improved owing to uniform distribution of hard TiB 2 particles. Based on our findings, it was concluded that processing parameters and amount of TiB 2 have significant influence on mechanical and wear behaviour of steel matrix composites. � 2019, The Indian Institute of Metals - IIM.
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    Probabilistic analysis of monopile-supported offshore wind turbine in clay
    (2018) Haldar S.; Sharma J.; Basu D.
    The dynamic behaviour of monopile supported offshore wind turbines (OWTs) is considerably influenced by inherent variabilities of soil properties and loading. This study investigates the effect of uncertainties in soil shear strength properties, and wind and wave loads on the reliability of OWT structures founded in clay. The OWT system is modeled as an Euler-Bernoulli beam and soil-structure interaction is incorporated using the American Petroleum Institute based cyclic p-y relationships. The uncertainties in soil undrained shear strength, in the parameters and equations of the p-y method, and in wind velocity are considered. Random wave loads are estimated from the code specified power spectral density function of the vertical sea surface elevation. Uncertainties in OWT responses are quantified using Monte Carlo simulations. The effects of length and diameter of the monopile, vertical sea surface displacement spectrum, and the probability distribution of wind speed on the dynamic responses of OWT are investigated. The study shows that the various power spectral density functions of wave surface displacement and various probability density functions of wind speed have a marginal effect on the response and fatigue life of OWTs. The mean fundamental frequency of the OWT system is significantly affected by the variability of the undrained shear strength of clayey soil. � 2017 Elsevier Ltd