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Measuring elastic constants of Hevea brasiliensis using compression and Iosipescu shear test

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Abstract

The increasing demand and widespread utility of wood composite products necessitate the knowledge of the orthotropic engineering and strength properties of the raw wood used for its safe design and effective performance. This research study aimed at finding the orthotropic elastic parameters of a sustainable timber in India, namely rubber wood (Hevea brasiliensis) with respect to the material axes longitudinal (L), radial (R) and tangential (T), which is a potential raw material for laminated products as verified. This study evaluated the three Young’s moduli, the three shear moduli and the six Poisson’s ratios of the wood species, unavailable in literature. Compression test in rectangular prism was used for the determination of the Young’s moduli and Poisson’s ratios. Shear characterization in the three material planes was done using the Iosipescu test. The highest value of normal stiffness of the material in compression was obtained in the longitudinal direction followed by radial stiffness and tangential stiffness. The shear stiffness was largest in the LR plane followed by LT and RT planes. RT plane exhibited the highest Poisson’s ratio and TL plane the lowest. Significant difference was noted in the shear strength of LR planes between block shear test and Iosipescu test but not with the LT planes.

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Acknowledgments

The authors express sincere gratitude for the permission and the genuine support rendered by Rakesh S, Deputy Director, Composites Entity (CMSE), Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram. The appreciation is extended to V. J. James, head of the testing division, CMSE and all the staff of the testing division for their great support and sharing their valuable time for this research study.

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Authors and Affiliations

  1. Department of Civil Engineering, National Institute of Technology, Calicut, Kerala, 673601, India

    Yashida Nadir & Praveen Nagarajan

  2. Composites Entity, Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram, Kerala, 695013, India

    A. J. Midhun

Authors
  1. Yashida Nadir
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  2. Praveen Nagarajan
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  3. A. J. Midhun
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Correspondence to Yashida Nadir.

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Nadir, Y., Nagarajan, P. & Midhun, A.J. Measuring elastic constants of Hevea brasiliensis using compression and Iosipescu shear test. Eur. J. Wood Prod. 72, 749–758 (2014). https://doi.org/10.1007/s00107-014-0842-4

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  • DOI: https://doi.org/10.1007/s00107-014-0842-4

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