OS-C501

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Offshore Standard DNV-OS-C501, November 2013 App.G Example for representative data – Unidirectional carbon tape AS4 12k – Page 240 G.1 General G.1.1 APPENDIX G EXAMPLE FOR REPRESENTATIVE DATA – UNIDIRECTIONAL CARBON TAPE AS4 12K G.1.1.1 This appendix describes an example of a fairly complete set of data for a carbon fibre reinforced epoxy laminate. The fibre type is AS4 12k G.1.1.2 Data were mainly obtained from Composite Materials Handbook Mil17, Volume 2, Technomics Publishing Company, Pennsylvania, USA, 1997 G.1.1.3 Laminates made of similar carbon fibres may be similar to this example and can be qualified according to Sec.4 [8.6]- Qualification against representative data. G.1.1.4 Matrix dominated properties may change considerably when changing the resin system. G.1.1.5 Laminates made of carbon fibres with different characteristics than AS4 12k may have very different properties from the ones listed here. G.1.1.6 Representative data for other materials can be measured and used like this example, as long as the requirements given in Sec.4 [8.5] and 600 are fulfilled. G.1.1.7 There is a lack of data for matrix dominated properties and of properties in water. Properties in other fluids are not listed, since only few and specific data exist. If such properties are needed some qualification testing may be required. G.2 Definition of material The material is described according to Sec.4 [8.5.2]. Table G-1 Properties to define the material Constituent materials: Generic Fibre type Bundle type Fibre trade name Type of weave Type of sizing Fibre Manufacturer Weaver Fabric trade name and batch number Requirements to group measurements from different laminates Carbon –PAN Precursor 12k filaments per tow AS4 12k Unidirectional Tape Epoxy compatible Hercules U.S. Polymeric U.S. Polymeric AS4 12k/E7K8 u.d. tape Generic resin type (e.g. epoxy, polyester) Epoxy Specific resin type (trade name, batch number) U.S. Polymeric E7K8 Catalyst (trade name and batch number) - Accelerator (trade name and batch number) - Fillers (trade name and batch number) None Additives (trade name and batch number) None Process parameters: Laminator (company) not relevant Processing method Autoclave cured Processing temperature 149 - 154° C, 120 – 130 min. Processing pressure 3.79 bar Process atmosphere (e.g. vacuum) - Post curing (temperature and time) None Control of fibre orientation - DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 App.G Example for representative data – Unidirectional carbon tape AS4 12k – Page 241 Table G-1 Properties to define the material (Continued) Constituent materials: Requirements to group measurements from different laminates Fibre volume fraction 53 –60% Void content 0.64 – 2.2% Conditioning parameters: See sections for properties: G.3 Quasi static properties in air (QSA) G.3.1 Test environment G.3.1.1 The test environment is described according to Sec.4 [8.5.2]. Table G-2 Conditioning parameters Temperature Water content of the laminate (wet, dry) Chemical environment Loading rate Number of specimens G.3.1.2 The following properties are listed according to Sec.4 [2.2]. Characteristic values are calculated according to Sec.4 [2.4]. G.3.1.3 Most data are based on 20 measurements, apart from G.3.2 Fibre dominated ply properties 24 o C Dry Air 2.0 mm per minute (ASTM3039) Reported individually for all properties ε ∧ 1t which is based on 5 measurements. Table G-3 Fibre dominated ply properties Parameter Value Unit Explanation E 1 (UD ply) Mean 133 [GPa] Modulus of elasticity in main fibre COV 3.79% direction Charact.value as mean Mean 0.0177 Strain Tensioning strain at break in the main COV 4.81% fibre direction Charact.value 0.0101 Fibre dominat ed properti es ε ∧ 1t ε ∧ 1c 1t σ ∧ σ ∧ 1c Mean 0.0139 Strain Compressive strain at break in the main COV 11.0% fibre direction Charact.value 0.0064 Mean 2089 N/mm 2 (MPa) Tension stress at break in the main fibre COV 8.26% direction Charact.value 1606 Mean 1441 N/mm 2 (MPa) Compressive stress at break in the main COV 7.8% fibre direction Charact.value 1126 DET NORSKE VERITAS AS
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