Browsing by Author "Rajesh, R."

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    Evaluation of microstructure and mechanical properties of multi axial forged lm2 aluminum alloy
    (2019) Sajjan, S.S.; Kulkarni, M.V.; Ramesh, S.; Sharath, P.C.; Sangamesh, R.; Kumar, A.; Rajesh, R.
    Light metal Al alloys are presently used in aerospace and industrial applications. Hence, in the present study choice of material will be LM2 aluminum alloy and processed by multi-axial forging (MAF) technique at ambient temperature for different number of passes with an equivalent strain of 0.18, 0.36 and 0.54. Microstructural analysis was carried out on unprocessed and processed samples with scanning electron microscopy (SEM). As the number of MAF pass increases the average grain size was reduced because of plastic deformation by plane strain condition. Mechanical properties like Vickers hardness (VHN), tensile and compression test were carried out. Ultimate tensile strength (UTS) was increased after each pass of MAF due to strain hardening effect. After 3 MAF passes the compression strength was reached to maximum of 495 MPa as compared to as received sample 315 MPa and hardness, increased to 81 VHN as compared to 55 VHN for the received samples. The fractography analysis was explained using SEM images. As the number of passes increases dimple size reduces as compared to as received samples and which will be revealing the ductile mode of fracture. � 2019 Trans Tech Publications Ltd, Switzerland.
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    Evaluation of microstructure and mechanical properties of multi axial forged lm2 aluminum alloy
    (Trans Tech Publications Ltd ttp@transtec.ch, 2019) Sajjan, S.S.; Kulkarni, M.V.; Ramesh, S.; Sharath, P.C.; Sangamesh, R.; Kumar, A.; Rajesh, R.
    Light metal Al alloys are presently used in aerospace and industrial applications. Hence, in the present study choice of material will be LM2 aluminum alloy and processed by multi-axial forging (MAF) technique at ambient temperature for different number of passes with an equivalent strain of 0.18, 0.36 and 0.54. Microstructural analysis was carried out on unprocessed and processed samples with scanning electron microscopy (SEM). As the number of MAF pass increases the average grain size was reduced because of plastic deformation by plane strain condition. Mechanical properties like Vickers hardness (VHN), tensile and compression test were carried out. Ultimate tensile strength (UTS) was increased after each pass of MAF due to strain hardening effect. After 3 MAF passes the compression strength was reached to maximum of 495 MPa as compared to as received sample 315 MPa and hardness, increased to 81 VHN as compared to 55 VHN for the received samples. The fractography analysis was explained using SEM images. As the number of passes increases dimple size reduces as compared to as received samples and which will be revealing the ductile mode of fracture. © 2019 Trans Tech Publications Ltd, Switzerland.
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    Integration of LwIP Stack over Intel(R) DPDK for High Throughput Packet Delivery to Applications
    (2015) Rajesh, R.; Ramia, K.B.; Kulkarni, M.
    Performance of generic operating system like Linux based IP stacks on multicore processors is much less than that of the purpose built IP stacks from the commercial stack vendors which typically run on a SoC/ASICs/Network processor. The issue of under-utilization of hardware resources arises from the fact that the generic IP stacks operate with much higher overhead, thereby decreasing the overall system performance compared to the capability of the underlying hardware. With Intel multicore processors, it's possible to transition from using discrete architectures per major workload (application, control, packet, and signal processing) to a single architecture that consolidates the workloads into a more scalable and simplified solution. This is possible, in large part, due to the Intel Data Plane Development Kit (Intel DPDK), a set of data plane libraries that can improve packet processing performance by up to ten times compare to processing capabilities by traditional OS. Users can integrate their own custom IP stacks with the Intel DPDK and get the advantage of accelerated performance of the Intel DPDK to their applications. This paper explains integration of a version of Light Weight TCP/IP (LwIP) stack with Intel DPDK to extend high packet processing capabilities of Intel DPDK to application layer level and measuring the performance capabilities of DPDK-LwIP network stack. � 2014 IEEE.
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    Integration of LwIP Stack over Intel(R) DPDK for High Throughput Packet Delivery to Applications
    (Institute of Electrical and Electronics Engineers Inc., 2014) Rajesh, R.; Ramia, K.B.; Kulkarni, M.
    Performance of generic operating system like Linux based IP stacks on multicore processors is much less than that of the purpose built IP stacks from the commercial stack vendors which typically run on a SoC/ASICs/Network processor. The issue of under-utilization of hardware resources arises from the fact that the generic IP stacks operate with much higher overhead, thereby decreasing the overall system performance compared to the capability of the underlying hardware. With Intel multicore processors, it's possible to transition from using discrete architectures per major workload (application, control, packet, and signal processing) to a single architecture that consolidates the workloads into a more scalable and simplified solution. This is possible, in large part, due to the Intel Data Plane Development Kit (Intel DPDK), a set of data plane libraries that can improve packet processing performance by up to ten times compare to processing capabilities by traditional OS. Users can integrate their own custom IP stacks with the Intel DPDK and get the advantage of accelerated performance of the Intel DPDK to their applications. This paper explains integration of a version of Light Weight TCP/IP (LwIP) stack with Intel DPDK to extend high packet processing capabilities of Intel DPDK to application layer level and measuring the performance capabilities of DPDK-LwIP network stack. © 2014 IEEE.
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    Marine chitinase AfChi: green defense management against Colletotrichum gloeosporioides and anthracnose
    (Springer Science and Business Media Deutschland GmbH, 2024) Rajesh, R.; Raval, K.; Raval, R.
    Anthracnose disease, caused by the Colletotrichum gloeosporioides species, affects vegetables, fruits, pulses, and cereals, leading to significant economic losses worldwide. Although many synthetic fungicides are used to control this pathogen, eco-friendly biological alternatives are gaining popularity. This study focuses on isolating and purifying chitinase (Af Chi)from a marine bacterium and testing its antifungal efficacy against C. gloeosporioides spore germination by targeting the chitin in the fungal cell wall. The chitinase was purified from a marine bacterium A. faecalis from the Arabian Sea and had a molecular mass of 45 kDa and a specific activity of 84.6 U/mg. Af Chi worked best at 50 °C and pH 7.0 in Tris HCl buffer. Na+ ion was the highest cofactor, highlighting the halophilic nature of this chitinase. K+, Ca2+, Cu2+, Mg2+, Mn2+, and EDTA also increased activity, while Fe3+, Zn2+, Co2+, and Pb2+ decreased it. The Km and Vmax values were 1.87 µg/mL and 17.45 U/mL, respectively. Purified Af Chi at 10 mg/mL completely inhibited spore germination within 8 h and reduced the size of the spores. © The Author(s) 2024.
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    Mechanical and Microstructural Properties of Multi-Axially Forged LM6 Aluminium Alloy
    (Pleiades journals, 2019) Sajjan, S.S.; Kulkarni, M.V.; Ramesh, S.; Sharath, P.C.; Rajesh, R.; Kumar, V.
    In the present investigation, commercially available light metal aluminium LM6 alloy was processed by Multi-axial forging (MAF) at ambient temperature. MAF was carried out to an equivalent strain in 0.83, 1.66 and 2.4 i.e., 6 passes, 12 passes and 18 passes, respectively. The mechanical properties like tensile test, compression test, hardness and microstructural characterization were studied in processed and unprocessed samples. Ultimate tensile strength (UTS) and ductility improved from 137 to 185 MPa and 3 to 6.2% for as-received to processed samples, respectively. After 18 passes of MAF, the compression strength (CS) has improved from 342 to 530 MPa. Hardness increased as the number of forging passes increases as compared to unprocessed samples. Optical microscopy images were used to study microstructure observations, the average grain size is reduced from 60 to 2 μm for as-received to processed samples, respectively. Strength and hardness increased because of the grain refinement for the processed samples and the introduction of the high amount of dislocation density into the material during the MAF process. Fracture study was conducted by utilizing scanning electron microscopy, dimples on tensile fracture surfaces revealed that ductile mode of fracture. © 2019, Springer Nature Singapore Pte Ltd.