Statement
Metsä Wood
1 (3)
23.7.2020
Material properties of Kerto® LVL T-stud in Australia Kerto LVL T-stud material values were tested and analysed by Eurofins Expert Services Oy. Only European test methods were used and they are mostly in accordance with the Australian test methods according to AS/NZS 4357.2 and AS/NZS 4063.1. The European tests methods deviate from the Australian methods in bearing strength perpendicular to grain. European 5th percentile compression strength perpendicular to grain values are much lower than Australian mean bearing strength perpendicular to grain values. Shear at joint has not been tested. The design characteristic values for use with AS 1720.1 are given in the below table. Evaluation of design characteristic values was done according to AS/NZS 4063.2. The joint group was defined according to the standard AS 1649 based on density only. The stress grade was defined according to AS/NZS 4357.0 and AS 1720.1. The product doesn’t have a third party certificate in Australia. Design characteristic property (thickness range 30 – 75 mm) 5th percentile bending strength, parallel to grain, edgewise (cross section depth h = 300 mm)
Value A
27,0 MPa
5th percentile bending strength, parallel to grain, flatwise
B
32,0 MPa
5th percentile tension strength, parallel to grain (cross section width (larger crosssectional dimension) h = 150 mm)
D
22,0 MPa
5th percentile tension strength, perpendicular to grain, edgewise
E
-
5th percentile compression strength, parallel to grain
G
26,0 MPa
5th percentile compression strength, perpendicular to grain, edgewise
H
4,0 MPa
5th percentile compression strength, perpendicular to grain, flatwise
I
0,8 MPa
5th percentile shear strength, parallel to grain, edgewise
J
3,6 MPa
5th percentile shear strength, parallel to grain, flatwise
K
2,0 MPa
Mean apparent modulus of elasticity, parallel to grain
ABDG
9200 MPa
Mean modulus of rigidity, parallel to grain, edgewise
J
500 MPa
Mean modulus of rigidity, parallel to grain, flatwise
K
500 MPa
5th percentile shear at joint strength, edgewise
-
-
5th percentile shear at joint strength, flatwise
-
-
Joint group
-
JD5
Stress grade
-
F8
Mean density
-
440 kg/m3
For other cross section depths the design characteristic value is multiplied by 𝑘ℎ = (
300 0,167 ℎ
)
when h > 300 mm
For other cross section widths the design characteristic value is multiplied by 𝑘ℎ = (
150 0,167 ℎ
)
when h > 150 mm