Chennai, State of Tamil Nadu, India

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    ABSTRACT: Certain surface defects of significant depth with maximum linear indication of 20mm at the weld area have been observed during Liquid Penetrant Inspection (LPI) of the Inclined Fuel Transfer Machine (IFTM) welded chain. The same has been subjected to fatigue and break load testing to ascertain its structural integrity under service conditions. Two specimens have been subjected for testing to get repeatable experimental observations. Both the specimens tested for the required number of fatigue cycles (97000 cycles as per ASME, Mandatory Appendix 6) towards the structural integrity demonstration. At the end of fatigue testing, the maximum linear indication of the surface defect of the weld area increased from 20mm to 25mm without any loss of integrity. Individual links of both the chains were able to articulate freely after completing the fatigue test. After completing the required fatigue cycle both the specimens were subjected to break load testing. The lowest break load obtained from both the specimen was 27.1t and the respective collapse load obtained as per the ASME double slope method was 22 t. The above results indicated that, IFTM chain assembly qualifies for the safety with very high margins. Also, these experimental results give confidence that, collapse load obtained by the ASME double slope method is having a very high margin (∼ 18%) with the actual break load. Finite element analysis has also been performed before conducting the experiment to understand the overall stress distribution of the chain under load condition and also to identify the critical location. The critical location predicted by FE analysis was in good agreement with the experimental results.
    No preview · Article · Dec 2015 · Procedia Engineering
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    ABSTRACT: Acoustic emission (AE) and infrared thermography technique (IRT) have been used to study the tensile behavior of AISI type 316 stainless steel. Strain rates of tensile testing were varied from 1.4 × 10−3 s−1 to 1.4 × 10−2 s−1. AE root mean square voltage increases with increase in strain rate due to the increase in source activation. Dominant frequency of the AE signals generated during different regions of tensile deformation has also been used to compare the results for different strain rates. The dominant frequency increases from elastic region to around 590 kHz during work hardening and 710 kHz around ultimate tensile strength (UTS) for all the strain rates. Temperature changes during different regions of deformation are monitored using infrared thermography. The temperature rise in the work hardening region is found to approximately increase linearly with time and from the slopes of the linear regression analyses the rate of temperature rise in the work-hardening region is obtained which is found to be very sensitive to strain rates. From the experimental results an empirical equation that relates the rate of temperature increase with strain rate and thermal hardening coefficient is obtained. The correlation between the variation of AE dominant frequency and temperature rise during different deformation regions provided better insight into the tensile behavior of AISI type 316 SS for different strain rates.
    Full-text · Article · Jan 2015 · Journal of Materials Research and Technology
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    ABSTRACT: Inconel 600, a Ni-based alloy was considered as a possible replacement for austenitic stainless steels for service at high temperature in nitrogen containing atmosphere of the neutron detector. To obtain a fundamental understanding of the differences in the diffusivity of nitrogen in pure Fe and Ni lattices, molecular dynamics simulations were carried out. Based on the simulation of nitrogen trajectories in the temperature range of 1200-1400 K, pre-exponential factor, activation energy and jumping frequency were calculated and compared for fcc Ni and Fe. MD simulations confirmed that rate of diffusion of nitrogen is lower in Ni when compared to Fe, suggesting the replacement of austenitic steel with Inconel 600 for better performance of the detectors.
    Full-text · Article · Dec 2014 · Results in Physics


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    603102, Chennai, State of Tamil Nadu, India
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Top publications last week by reads

International Journal of Chemical Kinetics 11/2011; 19(vol.43):648-656. DOI:10.1002/kin.20597
300 Reads
Natural Hazards 12/2014; DOI:10.1007/s11069-014-1293-2
150 Reads

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