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Tensile Properties of U/D Prepreg Laminate Compressive Properties of U/D Prepreg Laminates Figure 24- Fibre strengths & strains These graphs show the strengths and maximum strains of the different composites at failure. The gradient of each graph also indicates the stiffness (modulus) of the composite; the steeper the gradient, the higher its stiffness. The graphs also show how some fibres, such as aramid, display very different properties when loaded in compression, compared with loading in tension. 5.2.1.2 Laminate Impact Strength 300 250 200 150 100 50 0 E-Glass S-Glass Aramid Yarn 6781 HS Carbon Figure 25 - Comparison of Laminate Impact Strength Impact damage can pose particular problems when using high stiffness fibres in very thin laminates. In some structures, where cores are used, laminate skins can be less than 0.3mm thick. Although other factors such as weave style and fibre orientation can significantly affect impact resistance, in impact-critical applications, carbon is often found in combination with one of the other fibres. This can be in the form of a hybrid fabric where more than one fibre type is used in the fabric construction. These are described in more detail later. 26 - GTC-6-0417 Impact Strength (Ft. lbs/in2)PDF Image | GUIDE TO COMPOSITES
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