OS-C501

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Offshore Standard DNV-OS-C501, November 2013 App.F Example for representative data - Glass reinforced polyester laminate – Page 234 F.4 Long term properties in air F.4.1 Test environment The test environment is described according to Sec.4 [8.5.2]. Table F-6 Conditioning parameters Temperature 18 o C Water content of the laminate (wet, dry) Dry Chemical environment Air Loading rate about 1% per minute Number of specimens Reported individually for all properties F.4.2 Fibre dominated tensile properties F.4.2.1 Young's Modulus of ply in main fibre direction: Table F-7 Young's Modulus of ply in main fibre direction Long term load Mean E 1t no load COV, n charact. Mean E 1 fibre perm. load cyclic load R=0,1 cyclic load R=-1 cyclic load R=10 st.dev. charact. Mean st.dev. charact. Mean st.dev. charact. Mean st.dev. charact. Formula same as QSA same as QSA same as QSA Elastic modulus same as QSA Plastic strain: σ ε = 1520 t p (time in hours, strain in %) Plastic modulus E = p σ ε p 0.2 95% of QSA shortly before failure same as QSA 95% of QSA shortly before failure 95% of QSA shortly before failure same as QSA 95% of QSA shortly before failure unknown DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 App.F Example for representative data - Glass reinforced polyester laminate – Page 235 F.4.2.2 Strain to failure of ply in main fibre direction. All fatigue data are based on amplitudes: Table F-8 Strain to failure of ply in main fibre direction Long term Properties load no Mean same as QSA load COV,n same as QSA charact. same as QSA Mean Use stress based equation in 203 time to fail st.dev. charact. Mean ∧ perm. load ∧ σ ( t) static strength ( t) 1t ε = 1t E( t) just before failure st.dev., n " ε 0fatigue = 0.063, α = 0.101 (*) R=0.1 stat. strength Mean 90% of QSA ε ∧ 1t just before COV,n same as QSA failure charact. 90% of QSA charact. " Mean log[ε(N)] = ε 0fatigue – αlog(N) ε 0fatigue = 0.207, α = 0.101 (*) cyclic time to fail st.dev., n 0.072 (of log N) , n = 100 load charact. log[ε(N)] = ε 0fatigue – αlog(N) cyclic Mean log[ε(N)] = ε 0fatigue – αlog(N) load ε 0fatigue = 0.453, α = 0.1276 (*) time to fail st.dev. 0.438 (of log N) , n >100 charact. log[ε(N)] = ε 0fatigue – αlog(N) ε 0fatigue = 0.342, α = 0.1276 (*) R= - 1 stat. strength Mean 90% of QSA just before COV same as QSA failure charact. 90% of QSA cyclic Mean No representative data load time to fail st.dev. charact. R=10 stat. strength Mean No representative data just before COV failure charact. (*) Note: the slope of the fatigue SN curve tends to be steeper if the fibre volume fraction increases. DET NORSKE VERITAS AS
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OS-C501

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