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Terms

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.