Transcription of MECHANICAL PROPERTIES - Metsä Wood
1 KERTO LVL MANUAL MECHANICAL PROPERTIES 09/20201 Values are given according to the standard EN 14374and design values according with EN VALUESThe characteristic values in tables 1, 2 and 3 are given for a temperature of 20 C and relative humidity of 65 %, and they assume load duration of five-minutes. The MECHANICAL PROPERTIES of Kerto products are presented in Table 1, with Figure 1 illustrating the direction of the 1. THE CHARACTERISTIC STRENGTH VALUES FOR KERTO PRODUCTSP ropertySymbolFigure 1 Kerto-S 27 - 75 mmKerto-Q 21 - 24 mmKerto-Q 27 - 75 mmKerto-T 27 - 75 mmKerto-Qp39 - 51 mmKerto-Qp54 - 69 mmCharacteristic values [N/mm ]Bending strength: Edgewise(depth 300 mm)fm,0,edge,kA44,028,032,02 7, 036,038,0 Bending strength:Size effect parameters-0,120,120,120,150,120,12 Bending strength: Flatwise,parallel to grainfm,0,flat,kB50,032,036,032,036,036, 0 Bending strength: Flatwise,perpendicular to grainfm,90,flat,kC-see table 48,0-7, 56,5 Tensile strength.
2 Parallel to grain(length 3000 mm)ft,0,kD35,019,026,022,028,030,0 Tensile strength: Perpendicular tograin, edgewiseft,90,edge,kE0,86,06,0-3,02,5 Tensile strength:Perpendicular to grain, flatwiseft,90,flat,kF------Compressive strength:Parallel to grainfc,0,kG35,019,026,026,028,030,0 Compressive strength:Perpendicular to grain, edgewisefc,90,edge,kH6,09,09,04,06,06,0 Compressive strength:Perpendicular to grain, flatwisefc,90,flat,kI2,22,22,20,81,81,8 Shear strength: Edgewisefv,0,edge,kJ4,24,54,53,64,14,1 Shear strength:Flatwise, parallel to grainfv,0,flat,kK2,31,31,32,01,31,3 Shear strength:Flatwise, perpendicular to grainfv,90,flat,kL-0,60,6---Source: Kerto-S and Kerto-Q: Eurofins EUFI29-20000676-C Kerto-T: VTT-C-1781-21-07 Kerto-QP: VTT-S-05156-11 MECHANICALPROPERTIESKERTO LVL MANUAL MECHANICAL PROPERTIES 09/20202 Source: Kerto-S and Kerto-Q: EUFI29-20000676-C Kerto-T: VTT-C-1781-21-07 Kerto-Qp: VTT-S-05156-11 TABLE 2.
3 THE CHARACTERISTIC AND MEAN STIFFNESS VALUES FOR KERTO PRODUCTSP ropertySymbolFigure 1 Kerto-S 27 - 75 mmKerto-Q 21 - 24 mmKerto-Q 27 - 75 mmKerto-T 27 - 75 mmKerto-Qp39 - 51 mmKerto-Qp54 - 69mmCharacteristic values [N/mm ]Modulus of elasticity: Parallel to grainE0,kA B D G11 600830088008000980010 300 Modulus of elasticity: Compressionperpendicular to grain, edgewiseEc,90,edge,kH35020002000-350350 Modulus of elasticity: Compressionperpendicular to grain, flatwiseEc,90,flat,kI100100100-100100 Modulus of elasticity: BendingPerpendicular to face veneer grainEm,90,kC-ks.
4 Taul. 41700-17001700 Shear modulus: EdgewiseG0,edge,kJ400400400330400400 Shear modulus: Flatwise, parallel to grainG0,flat,kK27060100240100100 Shear modulus: Flatwise,perpendicular to grainG90,flat,kL-1616-1415 Mean values [N/mm ]Modulus of elasticity: Parallel to grainE0,meanA B D G13 80010 00010 500960011 70012 300 Modulus of elasticity: Compressionperpendicular to grain, edgewiseEc,90,edge,meanH43024002400-4304 30 Modulus of elasticity: Compressionperpendicular to grain, flatwiseEc,90,flat,meanI130130130-130130 Modulus of elasticity: BendingPerpendicular to face veneer grainEm,90,meanC-see table 42000-20002000 Shear modulus: EdgewiseG0,edge,meanJ600600600500600600 Shear modulus: Flatwise, parallel to grainG0,flat,meanK38080120320120120 Shear modulus: Flatwise,perpendicular to grainG90,flat,meanL-2222-2022 TABLE 3.
5 THE DENSITY VALUES FOR KERTO PRODUCTSP ropertySymbolFigure 1 Kerto-S 27 - 75 mmKerto-Q 21 - 24 mmKerto-Q 27 - 75 mmKerto-T 27 - 75 mmKerto-Qp39 - 51 mmKerto-Qp54 - 69 mmDensity [kg/m3]Characteristic density k-480480480410480480 Mean density mean-510510510440510510 Source: Kerto-S and Kerto-Q: EUFI29-20000676-C Kerto-T: VTT-C-1781-21-07 Kerto-Qp: VTT-S-05156-11 TABLE 4. KERTO-Q 21-24 MM, PROPERTIES PERPENDICULAR TO SURFACE VENEER DIRECTIONP ropertySymbolUnit21 mm I-III-I21 mm II-I-II24 mm II-II-IIKuva 1 Characteristic bending strength: Flatwise, perpendicular to grainfm,90,flat,k[N/mm2]14,07, 08,0 CCharacteristic modulus of elasticity: Bending perpendicular to grainEm,90,k[N/mm2]290010001000 CMean modulus of elasticity: Bending perpendicular to grainEm,90,mean[N/mm2]330012001200 CSource: EUFI29-20000676-CNOTE.
6 The characteristic values given in tables 1 to 4 can be used fortemperatures under 50 C for long-term LVL MANUAL MECHANICAL PROPERTIES 09/20203A Edgewise bending, parallel to grain (m,0,edge)B Flatwise bending, parallel to grain (m,0,flat)C Flatwise bending, perpendicular to grain (m,90,flat)D Tension, parallel to grain (t,0)E Edgewise Tension, perpendicular to grain (t,90, edge)F Flatwise tension, perpendicular to grain (t,90,flat)G Compression, parallel to grain (c,0)H Edgewise compression, perpendicular to grain (c,90,edge)I Flatwise compression, perpendicular to grain (c,90,flat)J Edgewise shear, parallel to grain (v,0,edge,k)K Flatwise shear, parallel to grain (v,0,flat,k)L Flatwise shear, perpendicular to grain (v,90,flat,k)Figure 1.
7 Strength and stiffness orientations (grain direction of the face veneer )KERTO LVL MANUAL MECHANICAL PROPERTIES 09/20204 PARTIAL FACTOR FOR THE MATERIALK erto-LVL partial factor M = Defined separately in National Annex for each country, is the recommended value in the standard EN ACCOUNTING FOR THE LOAD DURATION AND MOISTURE CONTENTThe moisture content of the product, the load duration, and the effect of deformations shall be taken into considerationin the design. Strength modification factor kmod and deformation modification factor kdef (see Tables 6 and 7) asgiven in the Eurocode 5 are used in the Changes in moisture content may cause relatively large deformations in wood products and increase 6.
8 STRENGTH MODIFICATION FACTOR kmod FOR SERVICE CLASSES AND LOAD DURATION CLASSESP ermanentactionLong termactionMedium termactionShort termactionInstantaneousactionService Class 10,600,700,800,901,10 Service Class 20,600,700,800,901,10 Service Class 30,500,550,650,700,90 Source: EN 1995-1-1 TABLE 5. VENEER LAY-UP FOR KERTO-Q PRODUCTN ominal thickness [mm]Number of pliesLay-up217| ||| |217|| | ||248|| || ||279|| ||| ||3010|| |||| ||3311|| ||||| ||3913|| ||| ||| ||4515|| |||| |||| ||5117|| ||||| ||||| ||5719|| ||| ||||| ||| ||6321|| ||| ||| ||| ||| ||6923|| |||| ||| ||| |||| ||7525|| ||||| ||| ||| ||||| ||Source: EUFI29-20000676-CTABLE 7.
9 DEFORMATION MODIFICATION FACTOR kdefFigure 1 Service Class 1 Service Class 2 Service Class 3 Kerto-S: All orientationsA-L0,600,802,00 Kerto-Q: Bending edgewiseA0,600,802,00 Kerto-Q: Bending flatwiseB, C0,801,002,50 Kerto-Q: Other orientationsD-L0,600,802,00 Kerto-T: All orientationsA-L0,600,802,00 Kerto-Qp: Bending edgewiseA0,600,802,00 Kerto-Qp: Bending flatwiseB, C0,801,002,50 Kerto-Qp: Other orientationsD-L0,600,802,00 Source: EN 1995-1-1 KERTO LVL MANUAL MECHANICAL PROPERTIES 09/20205 SIZE EFFECT PARAMETERThe effect of the size of the member on the edgewise bending strength and the member s tensile strength values shall be taken into consideration in the design.
10 This is done through the use of the kh and kl factors given in Eurocode 5. The values of the size effect parameter s are given in Table members subjected tobending moments stresskh =min1,2300hsfor members subjected to tension stress parallel to grainkl = min1,13000ls_2h 100 mm = depth of the stressed memberl = length of the stressed memberEXAMPLE:Calculated bending strength fm,d for Kerto-S beam (h = 400 mm, Service Class 1, medium term action).FACTOR COMPRESSION PERPENDICULAR TO THE GRAINFACTOR FOR NOTCHED MEMBERSS tandard EN 1995-1-1 (equation ) gives factor kn = 4,5 for LVL.
