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RISS 인기검색어
- 검색키워드
- 저자 : Mithilesh Kumar Dewangan (검색결과 3 건)
- 무료
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Residual stress analysis of swage autofrettaged gun barrel via finite element method
Mithilesh Kumar Dewangan,S. K. Panigrahi 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7
Residual stress analysis of swage autofrettaged gun barrel is performed in this study via finite element (FE) method. The swage autofrettagetechnique is one of the modernized pre-stressing methods to enhance the load bearing capacity and fatigue life of all gun barrels. An oversized moving mandrel is forced inside the gun barrel, which deforms the material through physical interference. The process isanalyzed by evaluating residual stresses using a commercially available software package. The deformation effects caused by the mandreland the geometrical variation of the mandrel on the gun barrel are analyzed in this study. This field has been insufficiently researched,but the effect of pre-stressing on the barrel, and at the start and mid-length for the swaging process, is not well examined. Thus, furtheranalysis is required. The variations and effectiveness of the designed pressure band model are shown to define the problem easily. Resultsare evaluated at mid-length using a fixed fringe width percentage (A defined percentage of gun barrel axial length). The desired effectsare well validated through numerical investigation using FE analysis. This study reveals that the geometry should be designed very thoroughlyto determine the after effects. If too many variations occur, then the initial force requirement is extremely high; otherwise, thedesired swaging effect cannot be achieved.
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Multiscale Modelling of 3D Orthogonal Woven Composite under Ballistic Impact Using FEM
Mithilesh Kumar Dewangan,S. K. Panigrahi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10
The present paper deals with the multi-scale modelling and finite element analysis of Kevlar/Epoxy 3DOrthogonal woven composite (3DOWC) subjected to ballistic impact by a conical-cylindrical steel projectile. These aredesigned by utilising a Micro-Meso-Macro transition approach called Macro Homogeneous-Meso heterogeneous modellingtechnique. The Micro-Meso-Macro transition approach has been implemented in this research to develop the complex weavearchitecture of the target plate, and, a voxel-based non-conformal mesh has been used to understand the behaviour ofRepresentative Volume Element (RVE). The model is validated by using 2D weave architecture which has been analysed forconical 90 º projectile made up of 7.62 calibre. The damage properties are implemented using a user-defined function in theexplicit analysis VUMAT. The Macro homogeneous results provide the velocity variation and energy absorption of theprojectile with respect to the time history. Also, the energy absorption by its constituents are presented here, and substantialvalidation of results have been observed with the available literature.
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Mithilesh Kumar Dewangan,S. K. Panigrahi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
High-performance Kevlar/epoxy plain woven composites are subjected to normal and oblique impact by a conicalcylindricalprojectile. A multiscale modelling method which incorporates Micro-Meso-Macro transition approach isimplemented to study the ballistic impact phenomena. This Macro Homogeneous-Meso heterogeneous modelling techniquehas been executed in this examination to develop the intricate weave design of the objective plate. A voxel-based nonconformalwork has been utilized to comprehend the behavior of Representative Volume Element (RVE). The damageproperties are implemented utilizing a user-defined function for the explicit analysis. The model is approved with theavailable literary works for Kevlar and carbon composites to feature the thorough inclusion of the technique. The model isconsidered for different oblique angles (0 °, 30 °, 45 °, 60 °) and its effects on energy absorption, damage mechanism andresidual velocity are observed.
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