Definition(s)
Proportional Limit
Greatest stress that a material is capable of sustaining without deviation from linear proportionality of stress and strain.
- Note: 1 to entry: The proportional limit can be different in the axial direction compared to the hoop direction.
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