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2.0.1 Unit
The reciprocal of the unit area mass of fibre reinforced material（kg/m 2 ）and unit width（mm）of a lamina，withunitof1/（mm·kg/m 2 ）；orthereciprocaloftheunitwidth（mm）ofalaminate，withunitof 1/mm.
2.0.2 Unit tensile strength
Ultimate tensile load per unit width and unit area mass of fibre reinforced material of a lamina，with unit of N/（mm·kg/m 2 ）.
2.0.3 Unit tensile modulus
The ratio of the tensile load to the corresponding strain per unit width and unit area mass of fibre reinforced material of a lamina，with unit of N/（mm·kg/m 2 ）.
2.0.4 Tensile load carrying capacity of a laminate
Ultimate tensile load of unit width laminate，with unit of N/mm.
2.0.5 Laminate unit tensile stiffness
Ratio of tensile load to corresponding strain of unit width laminate，with unit of N/mm.
2.0.6 Design thickness of structural layer
Thickness of structural calculation for main load in layer，which does not include the thickness of lining and outer surface.
2.0.7 Design thickness
The entire layer thickness including the thickness of the structural layer，the thickness of the lining and the outer surface.
2.0.8 Simplified failure envelope
A simplified polygonal line for the biaxial stress failure curves of anisotropic materials.
2.0.9 Air bubble
A cavity formed by air retention in a layer.
2.0.10 Chip
A small piece of damage on the edge or surface of a layer.
2.0.11 Crazing
Irregular minor crack on the surface of a layer.
2.0.12 Dry spot
Areas where fibres are not adequately saturated with resin.
2.0.13 Exposed fibre
The surface or edge fibres are exposed.
2.0.14 Pit
A crater area of a layer.
2.0.15 Scratch
Scoring or shallow mark on the surface of a layer.
2.0.16 Wrinkle
Wavy surface of the layer due to irregular shape or overlapping of the structure.