OS-C501

Recommendations

Info

Offshore Standard DNV-OS-C501, November 2013 App.C Test methods for laminates – Page 218 Guidance note: This method is similar to the digestion method, except that the matrix is removed by the burning. This method works well for glass fibre reinforced composites. In calculating the volume fraction it is important to distinguish between fibre volume fraction and fibre weight fraction. C.5 Tests on tubular specimens C.5.1 ---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e--- C.5.1.1 For tubular components it is often preferable to test the laminate properties also on tubular specimens. C.5.1.2 Recommended test methods are ASTM D 5448, ASTM D 5449 and ASTM D 5450. C.6 Evaluation of stress versus strain curves C.6.1 Brittle characteristics C.6.1.1 A typical schematic of a stress-strain curve for a brittle material is shown in Figure C-1. The following elastic parameters are shown: elastic modulus for the linear range (E or G for shear), strength and strain at failure point (σ ult and ε ult ). Note that the linear limit (σ lin and ε lin ) is here the same as the point of failure. σ ult lin failure point Stress E lin Strain ε ult lin : Stress-strain relation Figure C-1 Properties to be measured on a linear stress-strain curve for a brittle core materials C.6.1.2 Calculation of modulus of elasticity: where i represents the index for the linear limit or ultimate value, etc. C.6.2 Plastic characteristics σ E i = ε C.6.2.1 A typical schematic of a stress-strain curve for a plastic material is shown in Figure C-2. The following elastic parameters are shown: elastic modulus for the linear range and non-linear range (E or G for shear), strength and strain at failure point (σ ult and ε ult ), strength and strain at yield point (σ yield and ε yield ). i i DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 App.C Test methods for laminates – Page 219 σ ult σ yield 0.002 Stress E lin E non-lin ε ε yield Strain Stress-strain relation ε ult Figure C-2 Properties to be measured on a non-linear stress-strain curve for a plastic core materials C.6.2.2 The offset strain to determine the yield point is defined here as 0.2% strain. C.6.2.3 Its recommended to calculate the modulus according to ISO 527 as the slope of the curve between 0.05% and 0.25% strain. C.6.3 Ductile Characteristics C.6.3.1 A typical schematic of a stress-strain curve for a ductile material is shown in Figure C-3. The following elastic parameters are shown: elastic modulus for the linear range and non-linear range (E or G for shear), strength and strain at failure point (σ ult and ε ult ), strength and strain at yield point (σ yield and ε yield ). Guidance note: Here the yield point is defined as the intersection between the stress-strain curve and the 0.2% offset of the linear relation. ---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e--- σ ult failure point σ yield 0.002 E lin E non-lin Stress ε Strain ε yield : Sress-strain relation ε ult Figure C-3 Properties to be measured on a non-linear stress-strain curve for a ductile core materials. C.6.3.2 For the calculation of modulus of elasticity, see [C.3.1.2]. The linear limit is defined here to be the same as the yield point. DET NORSKE VERITAS AS
Page 1 and 2:
OFFSHORE STANDARD DNV-OS-C501 Compo
Page 3 and 4:
Offshore Standard DNV-OS-C501, Nove
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168: Offshore Standard DNV-OS-C501, Nove
Page 217: Offshore Standard DNV-OS-C501, Nove
show all

OS-C501

Create successful ePaper yourself

Delete template?

Save as template?