ISO 13586 specifies the principles for determining the fracture toughness of plastics in the crack-opening mode (mode I) under defined conditions. Two test methods with cracked specimens are defined; three-point-bending tests and compact-specimen tensile tests in order to suit different types of equipment available or different types of material.
The methods are suitable for use with rigid and semi-rigid thermoplastic moulding, extrusion and casting materials; rigid and semi-rigid thermosetting moulding and casting materials. Certain restrictions on the linearity of the load-displacement diagram, on the specimen width and on the thickness are imposed to ensure validity since the scheme used assumes linear elastic behavior of the cracked material and a state of plane strain at the crack tip. Finally, the crack must be sharp enough so that an even sharper crack will not result in significantly lower values of the measured properties.
Tension-compression testing machine. The machine shall satisfy the requirements os ISO 5893. The load indicator shall show the total load carried by the test specimen. This device shall be essentially free from inertia lag at the test speeds used. It shall indicate the load with an accuracy of at least 1 % of the actual value. Machines for three-point-banding test and compact-specimen tensile tests. By means of our testing expertise and modular product design, we will help find the solution that is right for you. Give our test engineers a call today for help configuring the best test machine and accessories according to ISO 13586.
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