Abstract
This study consisted of developing and testing a method for determining the strain of fibre materials in tension. The method is based on a microtensile testing machine, built into a scanning electron microscope, that produces a tensile stress on the fibre. The strain caused by the effecting force is measured from a picture on video tape. The method has been tested with different types of fibre materials. With different fibre glass types the values of elongation at fracture were 0.5–.0%, for Kevlar fibre 1·5–6·0% and for carbon fibre 0.3–0.7%. It was noted that the deformation of glass fibres is not permanent. The method was noted to be practicable for testing different dry fibre materials and the method can be used to measure deformations (from 0·1% to as large deformations as there are). In principle the method is suitable for testing any fibre material, if the fibre properties do not change in vacuum.
Published Version
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