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      https://www.ias.ac.in/article/fulltext/boms/022/01/0001-0007

    • Keywords

       

      Kevlar; ultrasonic; compression; unit cell; tensile properties; deformation

    • Abstract

       

      Axially compressed Kevlar 49 fibres have been examined by X-ray diffraction methods. The most prominent effect of axial compression is the anisotropic deformation of the unit cell. Whereas thec-axial length, which corresponds to the chain axis, undergoes contraction, the basal plane dimensions manifest enlargement. The deformations increase with the extent of axial compression. The half-widths and the azimuthal spread of reflections also exhibit changes. The compression induced structural changes provide qualitative support to the experimentally observed reduction in tensile strength and modulus.

    • Author Affiliations

       

      R V Iyer1 Kalyani Vijayan1 K Sooryanarayana1 2 T N Guru Row1 2

      1. Materials Science Division, National Aerospace Laboratories, Bangalore - 560 017, India
      2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore - 560 012, India

    • Dates

       
      Published
      February 1999
      Manuscript received
      17 December 1998

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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