BS ISO 15509:2019 pdf download – Adhesives — Determination of the bond strength of engineering-plastic joints
This document 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 documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 10365, Adhesives — Designation of main failure patterns
ISO 17212, Structural adhesives — Guidelines for the surface preparation of metals and plastics prior to adhesive bonding
3? Terms? and? definitions
No terms and definitions are listed in this document.
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4 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 15 % 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,. 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.
5.1.3 Injection-moulding parameters
The parameters shall be agreed upon between the user and the plastic material supplier.
NOTE 1 The injection-moulding parameters will depend on the geometry of the mould and the nature of the plastic material.
The plastic material shall be pre-dried. The temperature and time shall be as agreed upon between the user and the plastic material supplier.
NOTE 2 Temperatures between 100 °C and 150 °C (depending on the type of plastic) over periods of 4 h to 6 h in a vacuum oven are the preferred conditions.
5.1.4 Removal of the sprue
Remove the central part, or sprue, from each of the adherends. A simple method consists of using a chisel while rotating the adherend in a lathe.
Avoid any contact with the bonding area during this operation.
5.1.5 Geometry
The specimen shall consist of two adherends bonded together.
The dimensions of each adherend shall be as given in Figure 2.
5.2 Surface preparation
Prepare the bonding surfaces of the adherends in accordance with ISO 17212.
Corona discharge at ambient pressure is the preferred method.
5.3 Assembly of the specimen in the mounting jig
Assemble the specimen using the mounting jig shown in Figure 3.
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 by means of the adjustment screws.BS ISO 15509 pdf download.