ISO 1924-3:2005 pdf download.aper and board -Determination of tensile properties — Part 3: Constant rate of elongation method(100 mm/min).
tensile energy absorption
amount of energy per unit surface area (test length x width) of a test piece when it is strained to the maximumtensile force
3.7
tensile energy absorption index
tensile energy absorption divided by the grammage
3.8
tensile stiffness
maximum slope of the curve obtained when tensile force per unit width is plotted versus strain3.9
tensile stiffness index
tensile stiffness divided by the grammage
3.10
modulus of elasticity
tensile stiffness divided by the thickness
4Principle
A test piece of given dimensions is strained to break at a constant rate of elongation using a testing machinethat automatically records both the tensile force and the elongation.From the recorded data, the tensilestrength, the strain at break, the tensile energy absorption and the tensile stiffness are calculated.
5Apparatus
5.1Tensile testing machine, including means of determining the force (i.e. a load-cell), the elongation andthe area between the force-elongation curve and the elongation axis.The testing machine is designed tostrain a test piece at a constant rate of elongation of 100 mm/min ±10 mm/min, and to record both the tensileforce and the elongation.
NOTE1 The true elongation rate is less than the rate of movement of the moving clamp due to the deflection of theload-cell and the testing machine.This rate difference has, however, normally a negligible effect on the strength values.
The testing machine shall have wo clamps for holding the test piece.Each clamp shall be designed to gripthe test piece firmly, but without damage，along a straight line across the full width of the test piece (theclamping line), and have a means of adjusting the clamping force.
