Defence Science Journal最新文献_第8页

Methodology for Application of Damage Mechanics Approach to Model High Temperature Fatigue Damage Evolution in a Turbine Disc Superalloy 应用损伤力学方法模拟涡轮盘高温合金高温疲劳损伤演化的方法

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18635

Jalaj Kumar, A. Vaidya, A. Venugopal Rao, D.V.V. Satyanarayana

{"title":"Methodology for Application of Damage Mechanics Approach to Model High Temperature Fatigue Damage Evolution in a Turbine Disc Superalloy","authors":"Jalaj Kumar, A. Vaidya, A. Venugopal Rao, D.V.V. Satyanarayana","doi":"10.14429/dsj.73.18635","DOIUrl":"https://doi.org/10.14429/dsj.73.18635","url":null,"abstract":"Aeroengine gas turbine components operate under complex loading environments. Turbine disc is one such component which experiences stresses at high temperature and accumulates life critical cyclic damage in the material during usage. This accumulation of cyclic damage results into significant deterioration in material strength which in turn may initiate the failure in these rotating components. This necessitates the need to develop an advanced lifing approach for fatigue life assessment of turbine disc. As there are no available standards for damage mechanics application, an attempt has been made in the present study to develop a methodology for application of damage mechanics approach to model high temperature fatigue damage evolution in a turbine disc Superalloy. High temperature (650oC) stress-controlled fatigue tests on turbine disc alloy have been performed to evaluate parameters for damage mechanics based models. Using this approach, damage evolution has been simulated at specimen level. A good correlation has been observed in the damage mechanics based model’s predicted damage and experimentally determined values.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136179457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Lead Free Magnetoelectric Materials for Magnetic Field Sensor applications 应用于磁场传感器的无铅磁电材料的研制

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18723

Adirajs Srinivas, N. Shara Sowmya, Pavan Kumar Naini, Partha Ghosal, M. Manivel Raja

{"title":"Development of Lead Free Magnetoelectric Materials for Magnetic Field Sensor applications","authors":"Adirajs Srinivas, N. Shara Sowmya, Pavan Kumar Naini, Partha Ghosal, M. Manivel Raja","doi":"10.14429/dsj.73.18723","DOIUrl":"https://doi.org/10.14429/dsj.73.18723","url":null,"abstract":"(100-x) Na0.5Bi0.5TiO3 (NBT)-(x) NiFe2O4 (NFO)(x = 0, 20, 40, 60, 80 and 100) composites are synthesized using conventional solid state reaction method. Crystal structure studies are performed by using X-ray Diffraction technique (XRD) and the Rietveld analysis of XRD patterns confirms the co-existence of cubic (NFO) and rhombohedral (NBT) symmetry with Fd- 3m and R3c space groups, respectively. Micro-structural study reveals the formation of combination of composite phases and its inter-coupling grains. The average grain sizes and area percentage of each phase for the composites are calculated using Image J software. The Magnetisation versus Magnetic field (M-H) hysteresis loops show soft magnetic behavior of composites with variation in Saturation magnetization (MS) and Coercivity (HC). A maximum MS (34 emu/g) and low HC (15 Oe) is obtained for (80) NFO - (20) NBT composite.The Polarization – Electric field (P-E) analysis shows that the maximum saturation polarization (PS) is obtained for (60)NBT-(40)NFO sample and is attributed to the leakage current generated by conductive NFO phase. The coupling between the ferrite and ferroelectric phase is studied based on the magnetoelectric voltage coefficient(αME). The maximum (αME) of 1.82 mV/cm-Oe is obtained for (80)NBT -(20)NFO sample and this is almost 80% higher than the previously published literature on NBT-NFO composites. This can be attributed to the uniform distribution of grains with each ferroelectric phase surrounded by ferrite phase as shown in the morphological study.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136179610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Tribological Coatings for Aerospace and Missile Applications 航空航天和导弹用摩擦学涂层的研制

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18718

J.K.N. Murthy, B. Venkataraman, Gokul Lakshmi, M. Ramakrishna

引用次数: 0

Realization of High Pressure Turbine Blades of a Small Turbo Fan Engine through Investment Casting Process 小型涡轮风扇发动机高压涡轮叶片熔模铸造工艺的实现

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18719

D. Chatterjee, A.S. Chauhan, Venkat ., D.P. Tigga, D.K Das

引用次数: 0

Microstructural Evolution and Mechanical Properties Co relation of Cold rolled Ferritic Lightweight Steel with Increasing Carbon 冷轧铁素体轻钢随碳含量增加的组织演变及力学性能关系

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18640

Shiv Kumar Khaple, V.V. Satya Prasad, B Gopala Krishna, D. V.V. Satyanararana

{"title":"Microstructural Evolution and Mechanical Properties Co relation of Cold rolled Ferritic Lightweight Steel with Increasing Carbon","authors":"Shiv Kumar Khaple, V.V. Satya Prasad, B Gopala Krishna, D. V.V. Satyanararana","doi":"10.14429/dsj.73.18640","DOIUrl":"https://doi.org/10.14429/dsj.73.18640","url":null,"abstract":"The structure-properties relationship of cold-rolled and annealed Fe-7wt.%Al lightweight steels for varying carbon contents is explored in this work.Unlike Fe-Mn-Al-C based steels, which experienced processing issues, the hot-worked plates of the present steel were successfully cold-rolled to 2mm thick sheets. Various phases present in the steel for different carbon contents as predicted using the ThermoCalc programme are in line with the experimental findings. The basic alloy with 0.01C contains only a ferrite phase, however, the alloys with higher carbon content have a significant quantity of κ-carbide precipitates. The addition of carbon to Fe-7wt.%Al steel has improved its tensile strength significantly (438 to 828MPa). Tensile elongation, on the other hand, has decreased dramatically (26 to 12 percent) with increasing carbon content The reduction in ductility with increasing carbon is mainly ascribed to the increasing κ-carbide precipitates volume fraction with higher hardness, but not due to the environmental embrittlement as observed in case of higher Al containing steels.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136179461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recrystallisation Characteristics of a Cu Bearing HSLA Steel Assessed Through High Temperature Compressive Deformation 用高温压缩变形评价含铜HSLA钢的再结晶特性

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18631

Atul Kumar, T.V.V.S. Vara Prasad, V.V. Karthik, Kumkum Banerjee, K. Gopinath, R. Balamuralikrishnan

{"title":"Recrystallisation Characteristics of a Cu Bearing HSLA Steel Assessed Through High Temperature Compressive Deformation","authors":"Atul Kumar, T.V.V.S. Vara Prasad, V.V. Karthik, Kumkum Banerjee, K. Gopinath, R. Balamuralikrishnan","doi":"10.14429/dsj.73.18631","DOIUrl":"https://doi.org/10.14429/dsj.73.18631","url":null,"abstract":"Dynamic (DRX) operative duringdeformation and static recrystallization (SRX) operative after deformation are considered responsible for the changes in microstructure and texture of deformed materials. Especially in the case of advanced steels that are required in the form of plates of various thicknesses, hot rolling is the main manufacturing process during which the steel undergoes DRX under the rolls and SRX between rolling passes/strands. Knowledge on DRX and SRX characteristics of such steels is crucial for optimisation of hot rolling parameters,achieving the desired microstructure and consequently the targeted mechanical properties.In this study, certain key aspects of both dynamic (DRX) and static recrystallisation (SRX) behaviour of aCu-bearing HSLA steel, which was developed at DMRL, have been explored through high temperature deformation studies using Gleeble thermo-mechanical simulator. Through uniaxial compression testing in the austenitic regime, domains of continuous and discontinuous DRX prevalent in the steel were identified and critical parameters for initiation of dynamic recrystallisation viz., critical strain (ec), critical stress (sc), peak stress (sp) and peak strain (ep) were determined as a function of temperature and strain rate. SRX characteristics were assessed through uniaxial double hit compression tests with fixed strain rate and strain per hit but at different temperatures and with different imposed intermediate static recrystallisation (ISRT) times. From the fractional softening data, parameters such as time for 50% recrystallisation, t0.5, temperature for 50% recrystallisation, T0.5, and activation energy, QSRX have been estimated.Although the steel exhibited good plastic deformation characteristics, the results suggest that the role of copper in retarding recrystallisation is significant.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136179613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface Morphology and Exchange Bias Anisotropy Studies in Large Area Deposited Co2FeSi Ir50Mn50 Multi Layers For Spintronic Applications 自旋电子应用中大面积沉积Co2FeSi Ir50Mn50多层膜的表面形貌和交换偏置各向异性研究

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18717

Himalaya Basumatary, Payel Chatterjee, M. Manivel Raja

{"title":"Surface Morphology and Exchange Bias Anisotropy Studies in Large Area Deposited Co2FeSi Ir50Mn50 Multi Layers For Spintronic Applications","authors":"Himalaya Basumatary, Payel Chatterjee, M. Manivel Raja","doi":"10.14429/dsj.73.18717","DOIUrl":"https://doi.org/10.14429/dsj.73.18717","url":null,"abstract":"Surface morphology and magnetic properties of ferromagnetic Heusler alloy Co2FeSi thin films and their multi-layers with anti-ferromagnetic Ir50Mn50, which find applications in spintronic devices were investigated. The sputtering process flow for large area deposition of thin films on 3 inch size thermally oxidized single crystal Si(100)/SiO2 substrates have been developed by optimizing the sputtering geometry and other process parameters. A uniform film composition, thickness, smooth surface, good crystallinity and magnetic properties have been achieved in the films over 3-inch size wafers. The isotropic magnetic properties such as saturation/remanent magnetizations, coercivity were achieved in Co2FeSi films deposited on 3-inch size Si(100)/SiO2 wafers with 15 nm Cr buffer layer. An exchange bias anisotropy has been established in Co2FeSi/IrMn multilayer by magnetic annealing process using in-house made magnetic annealing set up. A maximum exchange bias anisotropy field, Hex of 178 Oe and low coercivity, Hc of 85 Oe has been achieved in the Co2FeSi/IrMn multilayer stacks suitable for magnetic tunnel junctions for spintronic applications.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136179614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Aging on the Ballistic Performance of AA 7017 Alloy 时效对AA 7017合金弹道性能的影响

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18639

Pradipta Kumar Jena, K. Suresh, K. Sivakumar, R. K. Mandal, A. K. Singh

引用次数: 0

Effect of Temperature and Ply Angle on Performance of Ultra High Molecular Weight Polyethylene (UHMWPE) Laminates Under Low Velocity Impact 温度和铺层角对超高分子量聚乙烯(UHMWPE)层合板低速冲击性能的影响

4区工程技术

Defence Science Journal Pub Date : 2023-03-09 DOI: 10.14429/dsj.73.18637

T Sreekantha Reddy, P Rama Subba Reddy, Vemuri Madhu

引用次数: 0

A Secure, Configurable, Wireless System for Transfer of Sensor Data from Aircraft to Ground 一种安全的、可配置的、用于将传感器数据从飞机传输到地面的无线系统

IF 0.9 4区工程技术

Defence Science Journal Pub Date : 2022-12-06 DOI: 10.14429/dsj.72.17713

Balakrishnan Natarajan, A. Reddy, Nitin Sharma

{"title":"A Secure, Configurable, Wireless System for Transfer of Sensor Data from Aircraft to Ground","authors":"Balakrishnan Natarajan, A. Reddy, Nitin Sharma","doi":"10.14429/dsj.72.17713","DOIUrl":"https://doi.org/10.14429/dsj.72.17713","url":null,"abstract":"Modern aircraft are complex systems, equipped with hundreds of embedded sensors that record a wide repertoire of data during flight, such as crucial engine and airframe parameters, status of flight control system, air conditioning system, landing gear, life-saving and emergency systems. The data from the sensors is stored in the Flight Data Recorder. Maintenance personnel routinely transfer this sensor data to a ground terminal device to analyze it for aircraft health and performance monitoring purposes. Manual methods of extracting sensor data can be tedious and error-prone when large fleets of aircraft are involved. This paper presents a novel system to extract sensor data from aircraft to a ground terminal, wirelessly. The wireless system is implemented using unique, configurable wireless transmitter receivers (WTRs) designed for this purpose. The hardware for the wireless transfer of data was designed, interfaced with a modern aircraft’s system, and tested with the aircraft on the ground and another flying object. The data from the aircraft’s Flight Data Recorder was successfully transmitted and received wirelessly by the ground terminal, over a distance of 50 meters (with aircraft on ground) and 10 Kilometers (with a flying object), in a secure mode with zero packet loss. The WTRs have also qualified the requisite tests for airborne certification.","PeriodicalId":11043,"journal":{"name":"Defence Science Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48389471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0