OS-C501

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Offshore Standard DNV-OS-C501, November 2013 App.I Example for representative data unidirectional carbon tape TPW 0434 Prepreg – Page 246 I.1 General I.1.1 APPENDIX I EXAMPLE FOR REPRESENTATIVE DATA UNIDIRECTIONAL CARBON TAPE TPW 0434 PREPREG I.1.1.1 This appendix describes an example of a fairly complete set of data for a carbon fibre reinforced epoxy laminate. The laminates were made of carbon tape TPW 0343 Prepreg. I.1.1.2 Data were supplied by Tenax Fibers, Germany. I.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. I.1.1.4 Matrix dominated properties may change considerably when changing the resin system. I.1.1.5 Laminates made of carbon fibres with different characteristics than IMS 5131 410tex f12000 t0 may have very different properties from the ones listed here. I.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 [8.6] are fulfilled. I.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. I.2 Definition of material The material is described according to Sec.4 [8.5.2]. Table I-1 Properties to define the material Constituent materials: Generic Fibre type Bundle type Fibre trade name Type of weave Type of sizing Fibre Manufacturer Tape Manufacturer Fabric trade name and batch number Generic resin type (e.g. epoxy, polyester) Specific resin type (trade name, batch number) CIBA 6376 Catalyst (trade name and batch number) --- Accelerator (trade name and batch number) --- Fillers (trade name and batch number) --- Additives (trade name and batch number) --- Requirements to group measurements from different laminates Carbon-PAN Precursor 12k filaments per tow IMS 5131 410tex f12000 t0 Unidirectional Tape Epoxy compatible Tenax Fibers Germany UD-Prepreg TPW0343 Epoxy Process parameters: Laminator (company) Processing method Autoclave cured Processing temperature 177 o C for 150 minutes Processing pressure 6.0 bar Process atmosphere (e.g. vacuum) 0.99 bar Post curing (temperature and time) None Control of fibre orientation --- Fibre volume fraction 58-60% DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 App.I Example for representative data unidirectional carbon tape TPW 0434 Prepreg – Page 247 Table I-1 Properties to define the material (Continued) Constituent materials: Requirements to group measurements from different laminates Void content 1.88 - 2.06% Conditioning parameters: See sections for properties: I.3 Quasi static properties in air (QSA) I.3.1 Test environment I.3.1.1 The test environment is described according to Sec.4 [8.5.2]. Table I-2 Conditioning parameters Temperature 23 o C Water content of the laminate (wet, dry) Dry Chemical environment Air Loading rate 1-2 mm / minute * Number of specimens Reported individually for all properties * Rates varied slightly between test methods. Shear data were obtained from ±45 laminates tested at 2 mm/minute and sometimes at faster rates of about 6 mm/min after 2% strain. I.3.1.2 The following properties are listed according to Sec.4 [2.2]. Characteristic values are calculated according to Sec.4 [2.4]. I.3.1.3 Data are based on a set of 6 measurements for each property, backed up by more than 50 measurements from production control. I.3.2 Fibre dominated ply properties Table I-3 Fibre dominated ply properties Fibre dominat ed properti es Para-meter Value Unit Explanation E 1 (UD ply) Mean 170.6 [GPa] Modulus of elasticity in main fibre (136.9) direction, in tension and (compression) COV 0.82% (1.69%) Charact.value as mean Mean 0.0162 Strain Tensioning strain at break in the main fibre direction. Characteristic value calculated from strength data. ε ∧ 1t ε ∧ 1c 1t σ ∧ σ ∧ 1c COV 1.49 Charact.value 0.0156 Mean 1.13 Strain Compressive strain at break in the main COV Charact.value 1.06 fibre direction. Values calculated from strength data.* Mean 2835.6 N/mm 2 (MPa) Tension stress at break in the main fibre COV 3.1% direction Charact.value 2659.8 Mean 1547.9 N/mm 2 (MPa) Compressive stress at break in the main COV 3.18% fibre direction Charact.value 1449.4 * The measured compressive strain at failure was 1.195% with a COV of 3.48%. A lower value was put in the table to allow easy linear ply analysis. A higher strain to failure can be used, but non-linear effects should be taken into account, i.e., drop of Young's modulus. DET NORSKE VERITAS AS
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