OS-C501

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Offshore Standard DNV-OS-C501, November 2013 Sec.9 Structural analysis – Page 158 12.4 Connection between partial load-model factor and dynamic response analysis 12.4.1 The accuracy of the dynamic analysis shall be estimated. The load-model factor used, which is described in [12.2] and [12.3], shall include all uncertainties due to dynamic effects. 12.5 Connection between partial load-model factor and transfer function 12.5.1 The accuracy of the transfer function (see [1.4]) shall be estimated. The load-model factor used, which is described in [12.2] and [12.3], shall include all uncertainties due to the transfer function. DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 Sec.10 Component testing – Page 159 SECTION 10 COMPONENT TESTING 1 General 1.1 Introduction 1.1.1 Component testing is carried out for either: — qualification based entirely on tests on full scale or large scale components, or — updating or verification of analysis by testing. 1.1.2 This standard gives procedures to evaluate test results and shows procedures to determine test programmes. 1.1.3 A structure or part of a structure can in some cases be qualified by testing only, i.e. no structural analysis as presented in Sec.9 is performed. This approach is presented in [2]. 1.1.4 Testing can in some cases be carried out to document the design or increase confidence in design calculations. It is an alternative or complement to analysis based on basic material properties. See [3]. 1.1.5 If the component is checked by qualification testing only, design calculations are not relevant. The test results are the only relevant information to evaluate whether the component is fit for purpose. This also means that the qualification is only valid for the conditions tested. 1.1.6 If testing is carried out to complement the analysis, it is done to reduce or to eliminate the influence of systematic errors introduced in the design methodology or to verify that the assumptions regarding failure mechanisms, failure modes etc. on which the design is based are correct. 1.1.7 In most practical cases component testing is used in combination with a structural analysis to evaluate the component for a wider range than the actual test conditions. 1.2 Failure mode analysis 1.2.1 An analysis of all possible failure modes in the structure shall be done as described in Sec.3. 1.2.2 It shall be shown by testing or analysis that none of the possible failure modes will be critical for the performance and safety of the structure. Guidance note: A special concern with composite materials is that minor loads may cause failures even though the structure can well withstand the main loads for which it was designed or built. Such minor loads can be through thickness loads in laminates or sandwich structures or loads oriented perpendicular to the main fibre direction in the laminate. ---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e--- 1.2.3 An evaluation of failure modes is especially critical if long-term performance shall be documented and data must be extrapolated to longer lifetimes than test times. In that case failure may be caused by failure modes that were not critical in a short-term test (see [4]). 1.2.4 Temperature changes may introduce different failure mechanism. If the structure is exposed to different temperatures and resulting thermal stresses, possible changes of failure modes should be evaluated. Analytically these changes are modelled by temperature dependent material properties and by possible changes in the failure criteria that are applied, e.g. ductile brittle transition. Testing should be done for all conditions that cannot be modelled in a satisfactory way. 1.3 Representative samples 1.3.1 Test specimens shall represent the actual structure. 1.3.2 Production methods and materials shall be exactly the same, and production tolerances should be known and controlled. The tolerances for producing the test samples should be representative of production conditions of the product. 1.3.3 If the qualification is based on testing only [2], no changes shall be made to materials or production without new tests. 1.3.4 If testing is combined with analysis changes in materials or geometry may be permitted, if the consequences of the changes can be treated with confidence by the analytical methods. DET NORSKE VERITAS AS
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