OS-C501

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Offshore Standard DNV-OS-C501, November 2013 App.I Example for representative data unidirectional carbon tape TPW 0434 Prepreg – Page 248 I.3.3 Matrix dominated ply properties Table I-4 Matrix dominated ply properties Parameter Value Unit Explanation Matrix dominat ed properti es I.3.4 Through thickness ply properties I.3.4.1 There are no representative data. I.4 Long term properties I.4.1 E 2 (UD ply) COV 1.19% fibre direction Mean 9.5 [GPa] Modulus of elasticity transverse to main Charact.value as mean Mean 0.0081 Strain Tensile strain at break for the matrix in 2t COV - direction normal to the fibre direction, in the fibre plane. Charact.value 0.0070 Characteristic value calculated from strength data. ε ∧ ε ∧ 2 c σ ∧ 2 t σ ∧ 2 c ε ∧ 12 12 σ ∧ Mean - Strain Compressive strain at break for the matrix COV - in direction normal to the fibres. Charact.value - Mean 77.1 N/mm 2 (MPa) Tension stress at break normal to the fibre COV 6.69% direction. Charact.value 66.8 Mean - N/mm 2 (MPa) Compressive stress at break normal to the COV - fibre direction. Charact.value - Mean - Strain Shear strain in ply plane at linear limit and COV - at (failure). Charact.value - Mean 91.9 N/mm 2 (MPa) Shear stress in ply plane at (failure). COV 4.48% Charact.value 83.5 G 12 linear Mean - [GPa] Shear modulus in the ply plane in the liner COV - range Charact.value - G 12 nonlinear Mean 4.5 [GPa] Shear modulus in the ply plane at the COV 4.24% failure point Charact.value as mean ν 12 Mean - Ply major Poisson’s ratio COV - Charact.value - I.4.1.1 There are no representative data, for service in air or water. DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 App.J Method of estimation of characteristic strength – Page 249 APPENDIX J METHOD OF ESTIMATION OF CHARACTERISTIC STRENGTH The characteristic strength is defined as the 2.5% quantile in the strength distribution. The method for estimating the characteristic strength is based on requiring the level of safety given in this standard to be met regardless of the number of available strength test data. Tabulated values of k m in Table 4-3, Table 4-4 and Table 4-5 in Sec.4 have been derived such that the confidence levels at which the characteristic strength in Sec.4 [2.4.5] is estimated, ensure that the same target reliability level is achieved. This level is achieved regardless of the available number of results from material testing or testing of components. It is noted that the necessary confidence level to achieve this varies with the number of available test results. The k m values have been obtained based on the results from probability analyses in which the reliability level is calculated for the case that a limited number of data for the strength is available and for the case that there is perfect knowledge of the strength (i.e. when an infinite number of test results would be available). k m has been obtained by adjusting the value of the characteristic strength for the case with a limited number of tests results such that the reliability level comes out the same as for the case with perfect knowledge. The method of analysis is described in: — Ronold, K. and Lotsberg, I.: On the Estimation of Characteristic S-N curves with Confidence. Marine Structures, vol. 27, 2012, pp. 29-44. DET NORSKE VERITAS AS
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OS-C501

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