OS-C501

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Offshore Standard DNV-OS-C501, November 2013 Sec.3 Design input – Page 38 - Self-weight and wind load on a bridge are non-correlated processes. - Snow load and wind load on a roof may be fully negatively correlated processes, i.e. the maximum value of the one process and the minimum value of the other process may occur simultaneously. ---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e--- 11.3 Load effect and environmental conditions for time-dependent material properties 11.3.1 The sustained load effect values or the fatigue load effect values (when relevant) and the sustained environmental values should be used for the determination of time-dependent material properties as specified in Sec.3 [9.5]. 11.4 Load effect and environmental conditions for fatigue analysis 11.4.1 The fatigue load effects should be combined with the sustained environmental values for the fatigue analysis as specified in Sec.3 [9.6]. 11.5 Direct combination of loads 11.5.1 The combination of load effects and environments as described above should be used to obtain the load effects, i.e., local stresses and strains. 11.5.2 If transfer functions and structural analysis are linear, loads or moments can be combined by the procedures given above instead of the load effects. DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 Sec.4 Materials - laminates – Page 39 SECTION 4 MATERIALS - LAMINATES 1 General 1.1 Introduction 1.1.1 This section describes the mechanical material properties needed for design. It describes how to obtain all strength properties used in the failure criteria and all elastic properties needed for stress calculations. 1.1.2 The basic material properties used in these rules are orthotropic ply properties. 1.1.3 All properties shall be obtained directly by measurements or shall be traced back to measurements. The qualification of material properties is described in this section. Under certain conditions, typical values from databases can be used. Strength and stiffness values should be documented as characteristic values. 1.1.4 It is only necessary to obtain properties that are used in the design calculations and failure criteria. 1.2 Laminate specification 1.2.1 A composite laminate is made of many constituent materials arranged and produced in a specific way. Laminates used in a component shall be clearly specified and all materials shall be traceable. 1.2.2 A minimum set of process parameters and constituent material characterisations is given in Table 4-1. All these items shall be specified. Table 4-1 Basic information to identify a laminate Constituent materials: Generic Fibre type Type of weave Generic resin type (e.g. epoxy, polyester) Specific resin type (trade name) Process parameters: Processing method Processing temperature Processing pressure Process atmosphere (e.g. vacuum) Post curing (temperature and time) Control of fibre orientation Fibre volume fraction Void content Conditioning parameters: Temperature Water content of the laminate (wet, dry) Chemical environment Loading rate Measured values Guaranteed minimum value Standard deviation Number of specimens 1.3 Lay-up specification 1.3.1 A laminate is made of a sequence of layers. All materials and they stacking sequence shall be clearly identified. 1.3.2 The orientation of non-homogenous or anisotropic materials shall be clearly specified on the materials level and the structural level. 1.3.3 Laminates shall be specified in a way that they can be described by a sequence of stacked orthotropic plies. 1.3.4 The procedures of App.B should be followed to describe a lay-up. DET NORSKE VERITAS AS
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OS-C501

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