Fibre-reinforced plastic composites Declaration of raw material characteristics Part 5: Additional requirements for core materials

Transcription

1 CEN/TC 249 N494 Date: pren xxx-5:2010 CEN/TC 249 Secretariat: NBN Fibre-reinfrced plastic cmpsites Declaratin f raw material characteristics Part 5: Additinal requirements fr cre materials Einführendes Element Haupt-Element Teil 5: Teil-Titel Élément intrductif Élément central Partie 5 : Titre de la partie ICS: Descriptrs: Dcument type: Eurpean Standard Dcument subtype: Dcument stage: Wrking Dcument Dcument language: E C:\Users\Hubert\Desktp\CEN TC 249 N494.dc STD Versin 2.2

2 Cntents Page Frewrd Scpe Nrmative references Terms and definitins Cntent f a declaratin Additinal declaratin requirements General Prperties f fam cre material Prperties f balsa cre material Cntent f certificate f analysis (CA) General CA fr fam cre CA fr balsa cre Annex A (infrmative) Clarificatin f nminal, maximum and minimum test values A.1 General A.2 Clarificatin f nminal value A.3 Clarificatin f minimum and maximum value A.4 Guaranteed minimum and maximum value A.5 Extent f testing

3 Frewrd This dcument (pren xxx-5:2010) has been prepared by Technical Cmmittee CEN/TC 249 Plastics, the secretariat f which is held by NBN. This dcument is a wrking dcument. pren xxx cnsists f the fllwing parts, under the general title Fibre-reinfrced plastic cmpsites Declaratin f raw material characteristics: Part 1: General requirements Part 2: Additinal requirements fr resin, curing systems, additives and mdifiers Part 3: Additinal requirements fr fibres Part 4: Additinal requirements fr fabrics Part 5: Additinal requirements fr cre materials (this part) 3

4 1 Scpe This part f the standard specifies the minimum infrmatin t be declared fr cre materials t be used fr the manufacturing f cmpsites prducts. These specific declaratin requirements are in additin t the general requirements given in part 1 f this standard (i.e. pren xxx-1). The declaratin includes requirements fr the certificate f analysis (CA). The purpse f the CA is t verify that material prperties and quality cnfrms t the declared values. This part f the standard is applicable t rigid fam and balsa cre material. 2 Nrmative references The fllwing referenced dcuments are indispensable fr the applicatin f this dcument. Fr dated references, nly the editin cited applies. Fr undated references, the latest editin f the referenced dcument (including any amendments) applies. EN xxxx-1:20xx, Fibre-reinfrced plastics cmpsites Declaratin f raw material characteristics Part 1: General requirements EN ISO 291, Plastics Standard atmspheres fr cnditining and testing (ISO 291:2008) EN ISO 844, Rigid cellular plastics Determinatin f cmpressin prperties (ISO 844:2007) EN ISO 845, Cellular plastics and rubbers Determinatin f apparent (bulk) density (ISO 845:2006) ISO 1922, Rigid cellular plastics Determinatin f shear strength ASTM C297, Standard Test Methd fr Flatwise Tensile Strength f Sandwich Cnstructins ASTM C 273, Standard Test Methd fr Shear Prperties f Sandwich Cre Materials ASTM C 365 Standard Test Methd fr Flatwise Cmpressive Prperties f Sandwich Cres ASTM D4444, Standard Test Methd fr Labratry Standardizatin and Calibratin f Hand-Held Misture Meters 3 Terms and definitins Fr the purpses f this dcument, the fllwing terms and definitins apply. 3.1 cre material the central cmpnent f a sandwich cnstructin t which the sandwich faces r skins are attached. 3.2 balsa cre material rigid balsa sheets cut in end-grain cnfiguratin t assure gd cmpressive prperties nrmal t the plane. 3.3 fam cre material varius different plymer materials that are famed in rder t reduce their specific weight. 4

5 4 Cntent f a declaratin A declaratin fr the cre material shall cnsist f infrmatin given in part 1 and part 5 (this part) f this standard, i.e. EN xxx-1 and EN xxx-5. 5 Additinal declaratin requirements 5.1 General The additinal requirements fr cre are given belw. All declaratin requirements, i.e. requirements in EN xxx-1 and this part (i.e. EN xxx-5), and applicatin dependant requirements as agreed between manufacturer/supplier and custmer, shall be declared by the manufacturer as infrmatin t the custmer, and the fllwing apply: if the prperty given has reference t a test standard r test methd, this test standard r test methd shall be used; the values given shall be in accrdance with the test standard given; the tlerances shall be given. If the tlerances are stated in the test standard these apply, if nt these shall be specified; the clarificatin f the terms nminal, minimum and maximum test values is given in Annex A; if the test envirnment is nt clearly stated in the specific test standard, the standard atmsphere cnditining and testing shall be carried ut in accrdance with EN ISO 291; the manufacturer shall be respnsible fr the perfrmance and results f all tests required fr the declaratin; the material prperty declaratin shall accunt fr any density variatin. Minimum and mean values shall be given cnsidering the range f density specified in 5.2. Mean values are average expected values at average density. Min value is expected minimum value at the lwer end f the density range. the material and fixture shall be acclimated at the test temperature fr a perid sufficient t ensure even temperature thrughut the specimen and fixture. If the test standard des nt specifically mentin hw the test at elevated/decreased temperature shall be perfrmed, the test shall be perfrmed in a temperature cntrlled chamber. The temperature in the specimen shall nt deviate mre than ± 2 C frm the nminal test temperature. 5.2 Prperties f fam cre material The additinal declaratin requirements fr cre material are listed belw. The requirements shall be given in accrdance with the test standards stated in Table 1 and including the tlerances. The fllwing additinal declaratin requirements a) t p) apply fr all fam cre material independent n applicatin: a) Identificatin (name/number/cde used by the manufacturer fr identificatin purpses); b) Density [kg/m 3 ]; c) Shear strength [MPa] average and minimum value; 5

6 d) Shear mdulus [MPa] average and minimum value; e) Shear elngatin (ultimate) [%] average and minimum value; NOTE Based n stress-strain curves btained. f) Cmpressin strength (ut f plane) [MPa] average and minimum value; g) Cmpressin mdulus (ut f plane) [MPa ] - average and minimum value; h) Tensile strength (ut f plane) [MPa] average and minimum value; i) Tensile mdulus (ut f plane) [MPa] - average and minimum value; j) Thickness [mm] 1) The thickness is defined as the nminal thickness f the sheet. 2) The thickness shall be measured 50 mm frm the crner with equal distance t the edges. 3) Tlerances shall be given as maximum difference f highest and lwest measured value (regardless f the lcatin) t the nminal value (may be given as % f the nminal value). k) In-plane length and width dimensins [mm x mm]; 1) The nminal length and width f the sheet/panel shall be given. 2) The tlerances shall be given as: i) Maximum deviatin frm the nminal length: ± [mm]. ii) Maximum deviatin frm the nminal width: ± [mm]. iii) Difference between the lengths f the tw diagnals. 3) When cre sheet/panel is based n cre blcks, the blck dimensin shall be given. l) Maximum cntinuus perating temperature [ C]; 1) Maximum temperature at which the unladed material can be expsed withut degradatin f the strength and mdulus prperties by mre than 10 % ver 3 mnths (measured at rm temperature) m) Heat resistance [ C]; 1) Heat resistance is defined as the temperature at which the average strengths and mdule bth in shear and cmpressin have decreased by 20% relative t the average values btained at the standard test temperature accrding t the relevant test standard. 2) All fur temperatures (strength related and mdulus related fr shear and cmpressin) shall be given. 6

7 n) Maximum prcess temperature [ C]; 1) The maximum temperature during prcessing, i.e. the highest allwable temperature during a curing cycle fr the sandwich. 2) Give at least ne set f values fr temperature, pressure and time fr such a prcess. ) Marking; 1) Each sheet shall be marked with its prduct identificatin (including nminal density). 2) Each sheet shall be marked with its batch number. p) Cre treatment/mdificatin/assembly; 1) When a material is added t the surface f the cre (cating/impregnatin), the type and weight per square meter shall be given including tlerances [kg/m 2 ]. 2) When cre is machined, the type f prcess shall be stated, i.e. surface sanding, milling, cnturing, etc. 3) When cre sheet is delivered with a carrier textile/scrim, the type and specificatin f the carrier textile/scrim shall be given 4) When cre blcks are bnded tgether t frm a rigid plate/sheet, the bnding system type must be specified 5.3 Prperties f balsa cre material The additinal declaratin requirements fr balsa cre material are listed belw. The requirements shall be given in accrdance with the test standards stated in Table 2 and including the tlerances. The fllwing additinal declaratin requirements a) t ) apply fr all balsa cre material independent n applicatin: a) Identificatin (name/number/cde used by the manufacturer fr identificatin purpses); b) Density [kg/m 3 ]; 1) The average, maximum and minimum values shall be given. 2) The density shall be measured prir t any applicatin f surface treatment (impregnatin). 3) The density shall be measured when the humidity in the sheet is as stated in clause m) c) Shear strength [MPa] - average and minimum value; d) Shear mdulus [MPa] average and minimum value; e) Shear elngatin (Ultimate) [%] average and minimum value; f) Cmpressin strength (ut f plane) [MPa] average and minimum value; g) Cmpressin mdulus (ut f plane) [MPa] - average and minimum value; h) Tensile strength (ut f plane) [MPa] average and minimum value; i) Tensile mdulus (ut f plane) [MPa ] - average and minimum value; 7

8 j) Thickness [mm] 1) The thickness is defined as the nminal thickness f the sheet. 2) The thickness shall be measured 50 mm frm the crner with equal distance t the edges. 3) Tlerances shall be given as maximum difference f highest and lwest measured value (regardless f the lcatin) t the nminal value (may be given as % f the nminal value). k) In-plane length and width dimensins [mm x mm] 1) The nminal length and width f the sheet/panel shall be given. 2) The tlerances shall be given as: i) Maximum deviatin frm the nminal length: ± [mm]. ii) Maximum deviatin frm the nminal width: ± [mm]. iii) Difference between the lengths f the tw diagnals. 3) When cre sheet/panel is based n cre blcks, the blck dimensin shall be given. l) Maximum cntinuus perating temperature [ C]; 1) Maximum temperature at which the unladed material can be expsed withut degradatin f the relevant material prperties by mre than 10% ver 3 mnths (measured at rm temperature) m) Humidity f the sheet [%]; 1) The maximum sheet humidity shall be given. This value is calculated as an average f measurements f at least the sheet s fur crners and its centre using a misture meter. 2) Balsa cre shall be packed in water prf bags. n) Cre treatment/mdificatin/assembly; 1) When a material is added t the surface f the cre (cating/impregnatin), the type and weight per square meter shall be given including tlerances [kg/m 2 ]. 2) When cre is machined the type f prcess shall be stated, i.e. surface sanding, milling, cntured, etc. 3) Cre sheet delivered with a carrier textile/scrim, the type and specificatin f the carrier textile/scrim shall be given 4) When cre blcks are bnded tgether t frm a rigid plate/sheet, the bnding system type shall be specified ) Marking; 1) Each sheet shall be marked with its prduct identificatin (including nminal density). 2) Each sheet shall be marked with its batch number. 8

9 6 Cntent f certificate f analysis (CA) 6.1 General Certificate f analysis (CA) shall be delivered n request. The certificate shall verify that the delivered batch is within the agreed number f declared values. The relevant test methds used t btain batch data shall be the same as used fr the declaratin. Each sheet f the CA shall be clearly marked with identificatin and batch number. 6.2 CA fr fam cre The certificate f analysis fr fam cre, with reference t relevant items given in 5.2., is given in Table 1 fr the applicatin independent fam cre prperties. 9

10 Table 1 CA prperties fr applicatin independent fam cre Ref. n 5.2 Prperty Declared value with tlerances (% r range) CA Test result Unit Test methd CA Cntent a b) Density [kg/m 3 ] EN ISO 845 c) Shear strength [MPa] d) Shear mdulus [MPa] e) Shear elngatin [%] f) Cmpressin strength [MPa] g) Cmpressin mdulus [MPa] h) Tensile strength [MPa] i) Tensile mdulus [MPa] ISO 1922 als fr -20 C and +80 C ISO 1922 als fr -20 C and +80 C ISO 1922 als fr -20 C and +80 C ISO 844 als fr -20 C and +80 C ISO 844 als fr -20 C and +80 C ASTM C297 als fr -20 C and +80 C ASTM C297 als fr -20 C and +80 C j) Thickness [mm] k) In-plane dimensins [mm] l) Maximum cntinuus perating temperature [ C] m) Heat resistance [ C] n) Maximum prcessing temperature [ C] [MPa] [min.] p) Cre treatment/mdificatin/ assembly [kg/m 2 ] a - Cmpulsry - Optinal 6.3 CA fr balsa cre The certificate f analysis fr fam cre, with reference t relevant items given in 5.3., is given in Table 2 fr the applicatin independent fam cre prperties. 10

11 Table 2 CA prperties fr applicatin independent balsa cre Ref. n 5.3 Prperty Declared value with tlerances (% r range) CA Test result Unit Test methd CA Cntent a b) Density [kg/m 3 ] EN ISO 845 c) Shear strength [MPa] ASTM C 273 d) Shear mdulus [MPa] ASTM C 273 e) Shear elngatin [%] ASTM C 273 f) Cmpressin strength [MPa] ASTM 365 g) Cmpressin mdulus [MPa] ASTM 365 h) Tensile strength [MPa] ASTM C297 i) Tensile mdulus [MPa] ASTM C297 j) Thickness [mm] k) In-plane dimensins [mm] l) Maximum cntinuus perating temperature [ C] m) Humidity f the sheet [%] ASTM D4444 n) Cre treatment/mdificatin/ assembly [kg/m 2 ] a - Cmpulsry - Optinal 11

12 Annex A (infrmative) Clarificatin f nminal, maximum and minimum test values A.1 General The requested prperties as given in this part f the standard EN xxx (i.e. EN xxxx-y), are given as nminal values with upper and lwer limits, maximum values and/r minimum values. The purpse f this annex is t clarify the nmenclature and the assciated values. A.2 Clarificatin f nminal value Nminal value means that the prperties f the material will have a mean value equal t the declared value. The mean value is based n all measured values f all batches f the manufacturer. The material delivered t the custmer is nrmally nly a fractin f the ttally prduced material. This may result in that the actual value n the prperty f the delivered material has a mean value lwer r higher than the declared value. Hwever, the mean value f the prperty f the delivered material shall nt be utside the declared tlerance limits in rder t be delivered accrding t the declared prperties. These tlerances include inaccuracy in the measurement itself. A.3 Clarificatin f minimum and maximum value Minimum value and maximum value means the mean value minus (-) and plus (+) tw standard deviatins, respectively. The minimum and maximum value is based n all measured values f all batches f the manufacturer. The delivered materials have a 97,6 % prbability f being within the minimum and maximum values, thus having 2,4 % prbability f being utside the minimum and maximum value. This implies that part f r all f the delivered material may belng t the fractin which is utside the minimum and maximum values. In rder t avid this, an agreement between the manufacturer and custmer stating that n material shall have prperties abve r belw the declared minimum and maximum values, i.e. guaranteed minimum r maximum values. A.4 Guaranteed minimum and maximum value Guaranteed minimum and maximum value mean that n delivered material has prperties belw r abve these values. When destructive testing is needed the mean value f the tested material (within the same batch) shall be within the declared minimum and maximum value fr that particular test if guaranteed values have been agreed. In case a guaranteed value is nt agreed, a sample test may have any value and still be within the specified range. 12

13 A.5 Extent f testing The extent f testing invlved fr a CA has t be agreed between the supplier and the custmer. Fr a resin material it is nrmal t btain the prperties frm the batch. Fr cre and fibre material, several f the tests are destructive tests and have t be perfrmed n undelivered material. Fr cre plates, destructive testing fr mechanical prperties can be perfrmed in the lwer range f density, while nn destructive tests, (dimensins and density) may be perfrmed n every plate r a selectin. The extent f testing f fibre material is similar as fr cre material, where typical values are btained frm ne r mre bbbins r an agreed selectin. 13