• Dr.M.Prithiviraj
• D.Palanikumar
• A.Sankara Narayana Murthy
• S.Devaraj
• S.Thangakasirajan

The current challenge in transport industry is to increase the usage of lightweight materials and to fit them in vehicle designs in order to improve the fuel economy, efficiency and to reduce vehicle weight, without comprising other attributes such as the performance, comfort, and mainly safety. Major components of automobile such as bumper, frame etc., are constructed by means of the thin walled structures. Therefore, the major objective of this work is to improve the cross worthiness of the thin walled steel tubes whose inner surface is filled with the rubberized coir natural fiber mat. The circular shaped tubes are chosen for this research due to its high specific energy absorption. Fiber is filled stage by stage from 0%, 33%, 66% till 100% fill. Length to diameter ratio (L/d) of the prepared specimen is restricted to 2, which prevents the buckling effects. The specimen is tested for axial loading using quasi static testing. Experimental results shows that there is a gradual increase of energy absorption and compressive strength in the thin walled steel tubes during the stage by stage fiber filling. There is an improvement of 40% in energy absorption capacity, 92% in compressibility strength, 20% in mean absorbing load, while the initial force required to trigger the displacement in thin walled tube is found to have negligible impact.

Thin walled tube, axial quasi static load, Natural fiber, rubberized coir, energy absorption capacity, compressibility strength.

"Energy Absorption Characteristics of Thin Walled Tubes with rubberized coir Filled in axial Loading", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 5, page no.j9-j14, May-2022, Available :http://www.jetir.org/papers/JETIR2205A02.pdf

"Energy Absorption Characteristics of Thin Walled Tubes with rubberized coir Filled in axial Loading", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 5, page no. ppj9-j14, May-2022, Available at : http://www.jetir.org/papers/JETIR2205A02.pdf