RaviKiran Kk - Academia.edu (original) (raw)
Papers by RaviKiran Kk
Existence of different human genes is due to the different combinations of 4 basics gene codes. I... more Existence of different human genes is due to the
different combinations of 4 basics gene codes. In the same way new
materials can be obtained by combining elements in the periodic
table in possible different ways which is called materials genome.
Materials genome is the invention of new materials from existing
materials in periodic table by combining them in required
proportions and controling their phases transitions. New
compounds can be obtained by combining different elements in
periodic table. But our main objective is to find the optimal
combination with desired properties. Finding the desired
compounds by conducting experiment on each and every
combination involvs a lot of time and money. Thus a computational
tool has to be developed where the properties of a material can be
known before a compound is ever made
SIMULIA India Regional User Meeting ‘13 , 2013
Bird Strike analysis is one of the certifications required for airframe structures. Finite eleme... more Bird Strike analysis is one of the certifications required for airframe structures. Finite element based computational methods are popularly used for demonstrating the structural integrity in a bird strike scenario. Current research aims at bring out comparison between analysis methods along with their pros and cons. Explicit analysis capabilities of ABAQUS are used for modeling the phenomenon using three methods LAGRANGIAN, COUPLED LAGRANGIAN-EULERIAN (CEL) and SMOOTPARTICLE HYDRODYNAMICS (SPH). Results are compared with published literature based on the standard experimental data. Critical parameters like HUGONIOT pressure and Stagnation pressure are compared from each study. Merits in all the three methods and bird models are presented with a view to guide the user in choosing an appropriate method depending on time and resource availability. The paper also deals with a bird impact modeling onto metallic riveted panels, which are typically idealized models for many practically used airframes structures like wing, flap, trailing edge, leading edge, using pure Lagrangian and SPH method. In high velocity bird strike scenario, fasteners will experience both shear and tensile loads and failure of aircraft structures are also governed by fastener failure modes. The fasteners behavior is modeled to simulate the failure due to shear load, tensile load and combined loads. Tensile and shear damage modes are simulated by supplying stiffness values in all connectors. This was possible because large variety of fastener modeling methods available in ABAQUS. Results are in good agreement with published experimental results. Aircraft components usually contain large number of fasteners which will significantly define the failure behavior of components of assembly. Current research high lights fastener modeling for bird strike analysis on airframe with stiffener as a test case. Keywords: Bird strike, Fastener damage, Coupled Eulerian Lagrangian analysis (CEL), Pure Lagrangian, Smooth particle hydrodynamics (SPH), Abaqus/Explicit, Hugoniot pressure, Stagnation pressure.
Liquid storage tanks are commonly used for storing chemicals in various Industrial plants. They a... more Liquid storage tanks are commonly used for storing chemicals in various Industrial plants. They also find
application in various power plants for storing oil, water for various requirements. Experience shows that the under
seismic loads storage tanks undergo damage which will lead to leaking of the tank’s contents. This analysis aims at
studying the deformation behavior of a typical liquid storage tank under seismic loads by accounting fluid structure
interaction effects. Modal analysis is performed to arrive at the fundamental frequency of sloshing and combined
frequencies of liquid and steel tank. This paper aims to developing a complete three dimensional modeling of liquid
tank including fluid structure interaction. A 3-dimensional finite element model is built using fluid and shell
elements. Bottom of the steel tank is fixed at bolt positions. Liquid element nodes are allowed to move freely in
vertical direction where as nodes on the periphery are attached to steel tank so that relative radial movement is
constrained. Modal analysis is done on complete three dimensional models and Sloshing frequency is found. The
comparison shows that analytical estimation sloshing frequency matches with the 3-d analysis. A full time history
analysis is performed to find deformation behavior of the tank. Time response of forces and moments at critical
locations is reported. Deformation behavior of the tank is obtained successfully.
These instructions give you guidelines for preparing papers for the International conference ICCS... more These instructions give you guidelines for preparing papers for the International conference ICCSE). Use this document as a template if you are using Microsoft Office Word 6.0 or later. Otherwise, use this document as an instruction set. The electronic file of your paper will be formatted further at International Journal of Computer Theory and Engineering. Define all symbols used in the abstract. Do not cite references in the abstract. Do not delete the blank line immediately above the abstract; it sets the footnote at the bottom of this column.
SIMULIA Community Conference , 2014
Bird strike Simulation helps in assuring aircraft safety, in eliminating cost & effort required f... more Bird strike Simulation helps in assuring aircraft safety, in eliminating cost & effort
required for practical tests. There has been significant research done on various ways of
doing bird strike simulation, till date Aerospace & defense Industry is concerned with two key
issues 1.Comparative assessment of available methods 2. A FE model for fastener failure and
fastener hole embrittlement. Current paper addresses relevant issues for today’s industry
towards a universally accepted method of bird strike analysis Finite element based
computational methods. First part of current research aims at bring out comparison between
analysis methods along with their pros and cons, the Explicit analysis capabilities of Abaqus
were used for modeling the phenomenon using three methods LAGRANGIAN, COUPLED
LAGRANGIAN-EULERIAN (CEL) and SMOOTH PARTICLE HYDRODYNAMICS (SPH).
Results are compared with published literature based on the standard experimental data.
Critical parameters like HUGONIOT pressure and Stagnation pressure are compared from
each study. Merits in all the three methods and bird models are presented with a view to
guide the user in choosing an appropriate method depending on time and resource
availability. A first of its kind Bird Strike Simulation Index (BSSI) proposed with FEM setup
time, run time and accuracy as parameters, BSSI will be a holistic guidance for industrial
user.
Second part of the paper deals the most challenging issue of fastener modelling for dynamic
loads. Analysis of bird impact modeling onto metallic riveted panels, which are typically
idealized models for many practically used airframes structures like wing, flap, trailing edge,
leading edge, are done using pure Lagrangian and SPH method. In high velocity bird strike
scenario, fasteners will experience both shear and tensile loads and failure of aircraft
structures are also governed by fastener failure modes. The fasteners behavior is modeled to
simulate the failure due to shear load, tensile load and combined loads. Tensile and shear
damage modes are simulated by supplying stiffness values in all connectors. This was possible
because large variety of fastener modeling methods available in Abaqus. Results are in good
agreement with published experimental results. In reality aircraft components usually contain
large number of fastener holes which will significantly define the failure behavior of
components of assembly due to micro level embritlement around fastener hole. A first of its
kind methodology for fastener hole and fastener damage is implemented which could
successfully interlinked to the global impact failure with local micro embritlement.
Existence of different human genes is due to the different combinations of 4 basics gene codes. I... more Existence of different human genes is due to the
different combinations of 4 basics gene codes. In the same way new
materials can be obtained by combining elements in the periodic
table in possible different ways which is called materials genome.
Materials genome is the invention of new materials from existing
materials in periodic table by combining them in required
proportions and controling their phases transitions. New
compounds can be obtained by combining different elements in
periodic table. But our main objective is to find the optimal
combination with desired properties. Finding the desired
compounds by conducting experiment on each and every
combination involvs a lot of time and money. Thus a computational
tool has to be developed where the properties of a material can be
known before a compound is ever made
SIMULIA India Regional User Meeting ‘13 , 2013
Bird Strike analysis is one of the certifications required for airframe structures. Finite eleme... more Bird Strike analysis is one of the certifications required for airframe structures. Finite element based computational methods are popularly used for demonstrating the structural integrity in a bird strike scenario. Current research aims at bring out comparison between analysis methods along with their pros and cons. Explicit analysis capabilities of ABAQUS are used for modeling the phenomenon using three methods LAGRANGIAN, COUPLED LAGRANGIAN-EULERIAN (CEL) and SMOOTPARTICLE HYDRODYNAMICS (SPH). Results are compared with published literature based on the standard experimental data. Critical parameters like HUGONIOT pressure and Stagnation pressure are compared from each study. Merits in all the three methods and bird models are presented with a view to guide the user in choosing an appropriate method depending on time and resource availability. The paper also deals with a bird impact modeling onto metallic riveted panels, which are typically idealized models for many practically used airframes structures like wing, flap, trailing edge, leading edge, using pure Lagrangian and SPH method. In high velocity bird strike scenario, fasteners will experience both shear and tensile loads and failure of aircraft structures are also governed by fastener failure modes. The fasteners behavior is modeled to simulate the failure due to shear load, tensile load and combined loads. Tensile and shear damage modes are simulated by supplying stiffness values in all connectors. This was possible because large variety of fastener modeling methods available in ABAQUS. Results are in good agreement with published experimental results. Aircraft components usually contain large number of fasteners which will significantly define the failure behavior of components of assembly. Current research high lights fastener modeling for bird strike analysis on airframe with stiffener as a test case. Keywords: Bird strike, Fastener damage, Coupled Eulerian Lagrangian analysis (CEL), Pure Lagrangian, Smooth particle hydrodynamics (SPH), Abaqus/Explicit, Hugoniot pressure, Stagnation pressure.
Liquid storage tanks are commonly used for storing chemicals in various Industrial plants. They a... more Liquid storage tanks are commonly used for storing chemicals in various Industrial plants. They also find
application in various power plants for storing oil, water for various requirements. Experience shows that the under
seismic loads storage tanks undergo damage which will lead to leaking of the tank’s contents. This analysis aims at
studying the deformation behavior of a typical liquid storage tank under seismic loads by accounting fluid structure
interaction effects. Modal analysis is performed to arrive at the fundamental frequency of sloshing and combined
frequencies of liquid and steel tank. This paper aims to developing a complete three dimensional modeling of liquid
tank including fluid structure interaction. A 3-dimensional finite element model is built using fluid and shell
elements. Bottom of the steel tank is fixed at bolt positions. Liquid element nodes are allowed to move freely in
vertical direction where as nodes on the periphery are attached to steel tank so that relative radial movement is
constrained. Modal analysis is done on complete three dimensional models and Sloshing frequency is found. The
comparison shows that analytical estimation sloshing frequency matches with the 3-d analysis. A full time history
analysis is performed to find deformation behavior of the tank. Time response of forces and moments at critical
locations is reported. Deformation behavior of the tank is obtained successfully.
These instructions give you guidelines for preparing papers for the International conference ICCS... more These instructions give you guidelines for preparing papers for the International conference ICCSE). Use this document as a template if you are using Microsoft Office Word 6.0 or later. Otherwise, use this document as an instruction set. The electronic file of your paper will be formatted further at International Journal of Computer Theory and Engineering. Define all symbols used in the abstract. Do not cite references in the abstract. Do not delete the blank line immediately above the abstract; it sets the footnote at the bottom of this column.
SIMULIA Community Conference , 2014
Bird strike Simulation helps in assuring aircraft safety, in eliminating cost & effort required f... more Bird strike Simulation helps in assuring aircraft safety, in eliminating cost & effort
required for practical tests. There has been significant research done on various ways of
doing bird strike simulation, till date Aerospace & defense Industry is concerned with two key
issues 1.Comparative assessment of available methods 2. A FE model for fastener failure and
fastener hole embrittlement. Current paper addresses relevant issues for today’s industry
towards a universally accepted method of bird strike analysis Finite element based
computational methods. First part of current research aims at bring out comparison between
analysis methods along with their pros and cons, the Explicit analysis capabilities of Abaqus
were used for modeling the phenomenon using three methods LAGRANGIAN, COUPLED
LAGRANGIAN-EULERIAN (CEL) and SMOOTH PARTICLE HYDRODYNAMICS (SPH).
Results are compared with published literature based on the standard experimental data.
Critical parameters like HUGONIOT pressure and Stagnation pressure are compared from
each study. Merits in all the three methods and bird models are presented with a view to
guide the user in choosing an appropriate method depending on time and resource
availability. A first of its kind Bird Strike Simulation Index (BSSI) proposed with FEM setup
time, run time and accuracy as parameters, BSSI will be a holistic guidance for industrial
user.
Second part of the paper deals the most challenging issue of fastener modelling for dynamic
loads. Analysis of bird impact modeling onto metallic riveted panels, which are typically
idealized models for many practically used airframes structures like wing, flap, trailing edge,
leading edge, are done using pure Lagrangian and SPH method. In high velocity bird strike
scenario, fasteners will experience both shear and tensile loads and failure of aircraft
structures are also governed by fastener failure modes. The fasteners behavior is modeled to
simulate the failure due to shear load, tensile load and combined loads. Tensile and shear
damage modes are simulated by supplying stiffness values in all connectors. This was possible
because large variety of fastener modeling methods available in Abaqus. Results are in good
agreement with published experimental results. In reality aircraft components usually contain
large number of fastener holes which will significantly define the failure behavior of
components of assembly due to micro level embritlement around fastener hole. A first of its
kind methodology for fastener hole and fastener damage is implemented which could
successfully interlinked to the global impact failure with local micro embritlement.