OS-C501

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Offshore Standard DNV-OS-C501, November 2013 Sec.4 Materials - laminates – Page 74 G 1 2 G 1 2 a t fa ilu re F A IL U R E S h e a r S tre s s G 1 2 a t 9 0 % o f fa ilu re lo a d 0 0 .0 S h e a r s tr a in Figure 4-6 Example of axial stress vs. strain curve of a ±45 laminate to obtain magnitude of the matrix shear modulus of a laminate with matrix cracks. 9.3.4 Similar procedures may be used on other laminate configurations to obtain ply properties of laminates with matrix cracks or with a non-linear deformed matrix. DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 Sec.5 Materials – sandwich structures – Page 75 1 General 1.1 Introduction SECTION 5 MATERIALS – SANDWICH STRUCTURES 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 A sandwich structure is considered here as a light weight core embedded between two faces (or skins). Faces are typically made of FRP laminates. The properties of laminates are described in Sec.4. This section concentrates on properties of cores and the core skin interface. 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. 1.1.5 General aspects that were already described in Sec.4 are not repeated here but only referred to. 1.2 Sandwich specification 1.2.1 A sandwich structure is made of many constituent material arranged and produced in a specific way. Laminate, core materials and adhesives used in a sandwich component shall be clearly specified and all materials shall be traceable. Laminate specification shall be organised as described in Sec.4. 1.2.2 For the core material and the adhesive, a minimum set of process parameters and constituent material characterisations is given in Table 5-1 and Table 5-2. All these items shall be specified. Table 5-1 Core specifications, process parameters and conditioning parameters Constituent core material(s): Generic core type (e.g. foam, honeycomb, balsa etc.) Core trade name (e.g. xyz123) Type of core (e.g. linear foam) Type/ characteristics of microstructure Core manufacturer Batch number Process parameters: Laminator (company) Processing method Processing temperature Processing pressure Process atmosphere (e.g. vacuum) Curing temperature Post curing (temperature and time) Density of core material Glass transition temperature Conditioning parameters: Temperature Water content of the core (wet, dry) Chemical environment Loading rate Number of specimens DET NORSKE VERITAS AS
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