Time filter

Source Type

Muralikannan R.,Sethu Institute of Technology | Gowthama S.,Tube Investments of India Ltd | Velumurugan R.,Indian Institute of Technology Madras
Materials Science and Technology Conference and Exhibition 2011, MS and T'11 | Year: 2011

Thin walled tubes are used as impact energy absorbing elements in transport vehicles. The circular tube is better energy absorber because it provides a reasonably constant operating force. Tubes of high strength steel and composites can be utilized to absorb the impact energy. In this work, circular tubes of annealed, dual phase (DP) steel and glass/epoxy composites are subjected to quasi static and impact loading. The specific energy absorption, energy absorption rate and energy absorption effective ness factor, which are the important factors in assessing the crash worthiness of structure are studied for the above tubular members. The specific energy absorption of composite tube is observed to be higher than the steel tubes. In annealed and DP tubes, it increases with the increase in impact velocity. The composite tube has controlled energy absorption than the other tubes. The study of energy absorbing effectiveness factor shows that composite tubes are more efficient in energy absorption. Copyright © 2011 MS&T'11®.


Muralikannan R.,Sethu Institute of Technology | Gowthama S.,Tube Investments of India Ltd | Velumurugan R.,Indian Institute of Technology Madras
AIST Steel Properties and Applications Conference Proceedings - Combined with MS and T'11, Materials Science and Technology 2011 | Year: 2011

Thin walled tubes are used as impact energy absorbing elements in transport vehicles. The circular tube is better energy absorber because it provides a reasonably constant operating force. Tubes of high strength steel and composites can be utilized to absorb the impact energy. In this work, circular tubes of annealed, dual phase (DP) steel and glass/epoxy composites are subjected to quasi static and impact loading. The specific energy absorption, energy absorption rate and energy absorption effective ness factor, which are the important factors in assessing the crash worthiness of structure are studied for the above tubular members. The specific energy absorption of composite tube is observed to be higher than the steel tubes. In annealed and DP tubes, it increases with the increase in impact velocity. The composite tube has controlled energy absorption than the other tubes. The study of energy absorbing effectiveness factor shows that composite tubes are more efficient in energy absorption.


Preethi M.,Indian Institute of Technology Madras | Preethi M.,Tube Investments of India Ltd. | Murty B.S.,Indian Institute of Technology Madras | Ganesh Sundara Raman S.,Indian Institute of Technology Madras | Natarajan R.,Tube Investments of India Ltd.
Transactions of the Indian Institute of Metals | Year: 2014

The present study is made to develop ultra fine grained microstructure in welded steel tubes, through multiple cold drawing passes followed by an annealing treatment. The average ferrite grain size is reduced from 16 to 1.9 μm. SAE 1019M steel grade used for a typical automotive driveline component is studied. Strains between 0.3 and 1.4 followed by annealing at 400, 450 and 500 °C are considered to optimize the combination of cold drawing strain and temperature required to produce ultra fine grained microstructure in steel tubes. At a strain value of 1.4 and annealing temperature, 500 °C, polygonal ferrite grains and fine carbide particles are obtained. This microstructure is found to be suitable owing to its combination of high strength and good ductility in steel tubes. Tensile strength as high as 1,061 MPa and 9 % elongation is obtained due to microstructural refinement. The strength is increased by 350 MPa compared to the strength of conventional cold-drawn welded tubes. © 2014 Indian Institute of Metals.


Simhachalam B.,Indian Institute of Technology Madras | Simhachalam B.,Tube Investments of India Ltd | Srinivas K.,Tube Investments of India Ltd | Rao C.L.,Indian Institute of Technology Madras
International Journal of Crashworthiness | Year: 2014

In this paper, compression behaviour and energy absorption of aluminium alloy AA7005 and AA7003 tubes were investigated both experimentally and numerically. LS-DYNA software was used for the static and dynamic simulations of AA7005, AA7003, AA6061 and high strength steel (DP800) tubes of equal dimensions. True stress-plastic strain curves at different strain rates from the literature were used in the dynamic simulations of AA7003 and DP800 tubes. Dynamic simulations were done with drop velocity from 7 to 15 m/s to understand the inertia and strain rate effects on energy absorption. The peak loads and energy absorption values between experimental compression results and numeral simulation are found to be in good agreement. The simulation results show the energy absorption characteristics of AA7XXX tubes are better than that of AA6061 and DP800 tubes based on specific energy. © 2014 Taylor & Francis.


Velmurugan R.,Indian Institute of Technology Madras | Muralikannan R.,Indian Institute of Technology Madras | Malhotra S.K.,Indian Institute of Technology Madras | Sudharsan V.,Tube Investments of India Ltd
Strain | Year: 2011

Thin walled tubes are used as energy absorbing elements in automobile applications. The circular tube proves to be a popular energy absorber because it provides a reasonably constant operating force which is the prime characteristics of the energy absorber. Square and rectangular tubes are widely used in automobile structures as these cross sections are suitable for welding with other components in the structure and hence highly preferred. Advanced high strength steels can be utilised to absorb crash energy and minimise intrusion in the occupant zone. In this work circular, square and rectangular tubes made up of dual phase steel are tested in static and dynamic conditions. All the tubes are subjected to same amount of input impact energy but the specific energy absorption is higher in circular steel tubes. The results are compared with those for annealed tubes of same cross section. The effect of impact velocity is also studied by keeping the impact mass constant and varying the drop height. The experimental results are compared with the theoretical results and good agreement is found. © 2009 The Authors.


Simhachalam B.,Tube Investments of India Ltd. | Lakshmanarao C.,Indian Institute of Technology Madras
SAE Technical Papers | Year: 2013

In this paper, energy absorption behavior of Aluminum Alloy AA 7003 and high strength steel tubes is investigated for automotive crash application both experimentally and numerically. The compression test results are compared with the static analysis results obtained from LS-Dyna Software. Tube thickness is varied in the LS-Dyna Finite Element Simulation Software to understand its effect on energy absorption behavior. The peak loads and energy absorption between experimental results and Numeral simulation are found to be in good agreement. The specific energy absorption between high strength steel and Aluminum Alloy AA 7003 is compared. Copyright © 2013 SAE International and Copyright © 2013 SIAT, India.


Natarajan R.,Tube Investments of India Ltd
Heat Treatment and Surface Engineering - Proceedings of Heat Treatment and Surface Engineering, HTSE 2013 | Year: 2013

Increasing the tool performance and life in bulk metal forming is a continuous challenge.The use of a thin film coating to address the issues of reducing friction during forming as well as improving abrasive and adhesive wear resistance while increasing stiffness of the tool possess attractive possibilities. Among the hard surface coatings, nanocrystalline diamond (NCD) is very promising for tribological applications, due to the excellent properties of diamond such as, high hardness, low friction coefficient, high wear resistance, high thermal conductivity and chemical inertness. In addition, NCD coatings have finer grain size and smoother surface finish resulting in lower friction and greater homogeneity in the formed product The hot filament chemical vapour deposition (HFCVD) technique can be used for growing nanocrystalline diamond coatings on different substrates over large areas. The basic principle of NCD coatings on by hot filament chemical vapour deposition on standard high speed steel (HSS) and WC-Co substrates will be highlighted The performance of the tool such as, surface finish, higher homogeneity in deformation, greater accuracy and higher fatigue strength in the work piece will be discussed Additionally hard surface coatings on engineering parts are discussed from process and application perspectives.


Trademark
Tube Investments of India Ltd | Date: 2011-06-10

Automobiles; Bicycle parts, namely, tubes and connectors for bicycle frames; Bicycles; Motorcycles; Scooters; Tricycles; Unicycles and structural parts therefor.

Loading Tube Investments of India Ltd collaborators
Loading Tube Investments of India Ltd collaborators