Major Poisson’s Ratio, Vha

Axial strain resulting from a stress in the hoop direction.

  • Note: 1 to entry: GRP pipes will typically contract in the axial direction when subjected to a hoop stress.
  • Note: 2 to entry: For GRP pipes wound at a 54° winding angle, the Poisson’s ratio will typically be smaller in magnitude than the minor Poisson’s ratio (3.2.79).

Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global Standards

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