ISO 15509 pdf download.Adhesives — Determination of the bond strength of engineering- plastic joints
1 Scope
This International Standard describes a test method for measuring the shear and/or tensile strength of an adhesively bonded plastic/plastic specimen of a specific design. This method allows the determination of a combined shear and tensile behaviour of the bond. These shear and tensile values are useful for design purposes.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 291 :1 997, Plastics — Standard atmospheres for conditioning and testing ISO 1 0365:1 992, Adhesives — Designation of main failure patterns ISO 1 3895:1 996, Adhesives — Guidelines for the surface preparation of plastics
3 Principle
A hollow cylindrical test specimen of specific design is used for the determination of the shear and tensile strengths of adhesively bonded plastic/plastic joints. These values can be used in calculation programmes. The rotationally symmetrical specimen allows testing under tensile, torsional or combined tensile/torsional loads if a suitable test machine is used.NOTE 1 The shear stress is not uniformly distributed as the stress varies by approximately from the inner radius to the outer radius. Therefore the calculated shear strength represents an “average” value. NOTE 2 The origin of the stress distribution curve is the deformation of the bond line, as the deformation increases with increasing diameter. The superimposition of shear and tensile stresses is negligible in the bondline of rotationally symmetrical specimen compared to lap-shear specimen as described in ISO 4587, Adhesives — Determination of tensile lap-shear strength of rigid-to-rigid bonded assemblies . There are practically no significant peaks in the stress distribution curve compared with the peaks observed in a lap-shear specimen, since the bond is continuous in the direction of the displacement.
4 Specimen
The spacers shall be made of the same material as the adherends in order to eliminate differences in thermal expansion between the spacers and the adherends. The spacers shall be linked to the metal sleeves which shall be freely movable along the guide pins. The alignment of the adherends in the two halves of the mounting jig shall be ensured by a metal centering cone on each baseplate. Each cone shall be freely rotating and have a spring (strong enough to prevent the adherend sliding) which presses the adherend against the centering cone. When contact is established between the adherends and the centering cones, fix the adherends in place at the fixation points. Assemble both baseplates (with the adherends but without adhesive) by introducing the guide pins into the sleeves and verify the gap between them (for the adhesive bond). The gap can be adjusted ba means of the adjustement screws. NOTE 2 The adjustment is usually made in order to achieve a bond thickness of . 4.4 Application of the adhesive Apply the adhesive using the application device as shown in Figure 4, as follows. Place a baseplate carrying one of the adherends under the dispenser. Adjust the dispenser so that the nozzle is located exactly above the application area. Apply the adhesive. NOTE An automated rotating device coupled with the dispenser has been shown to give good results. Assemble the two halves of the mounting jig and cure the adhesive in accordance with the manufacturer’s instructions.