Determination of design mechanical properties of adhesives in a tensile and compression test

Abstract

Evaluation of adhesive bond Young's modulus during crosslinking using a mechanical method and an ultrasound method B Mascaro, M K Budzik, M Castaings et al. Abstract. Structural adhesives are increasingly used in the construction of mechanical devices. Adhesive joints replace welded, soldered and other joints. The strength of the adhesive joints obtained allows the transfer of loads. The possibility of combining different materials is a significant advantage. In order to design joints, it is necessary to know the mechanical properties of adhesives. Determining them requires the use of special methods of obtaining specimens. Analytical and numerical methods of stress estimation in adhesive joints require more material data than is provided by manufacturers. The aim of the following work is to present the method of manufacturing specimens and to compare methods for determining mechanical properties based on three example structural adhesives. The paper presents two methods for determining the mechanical properties of exemplary structural adhesives: metacryl, epoxy and polyurethane adhesive. The tests were carried out on a cast and then machined specimens. Flat specimens were used in a tensile test. In compression test, round specimens were used. The results obtained from both tests were compared with the manufacturer's data. Differences and possible reasons for them were indicated. Stress distributions in the adhesive single lap joint were estimated using the Volkersen analytical method for various determined mechanical properties.

Mechanical properties of Methacrylic Plexus MA300 adhesive material determined in tensile test and butt joints of aluminum thick plates

“…The specimens for determining mechanical properties in a tension test were designed in accordance with the PN-EN ISO 527-2-1998 standard. Dimensions for a small 1BB shape specimen were used [4,5] (Figure 2a) with 3 mm of thickness were made from cast plates with dimensions of 75 mm x 45 mm x 5 mm. After curing, plates of methacrylic were removed from the molds.…”

“…Bonding is faster, simpler and cheaper. For these reasons, adhesive joints are increasingly replacing other joining techniques [3][4][5][6][7][8].…”

“…The difference may consist in applying the appropriate pressure and heat dissipation that is generated during the crosslinking process. The volume of adhesive in the joint is small, which causes a small amount of heat generated, which can additionally be returned to the connected elements [5]. All this means that the mechanical properties determined on the basis of cast samples may differ from those that occur in the adhesive joint.…”

Verification of Selected Failure Criteria for Adhesive Bonded Elements with Different Stiffness through the Use of Methacrylic Adhesive

“…Numerical methods provide more freedom in creating a joint geometry [ 7 , 8 , 9 ], however, it is necessary to use appropriate models and material data for the adhesive and the elements to be bonded. The mechanical properties of an adhesive can be obtained for cast specimens [ 10 ] or for specimens which are tested for the joint adhesive layer [ 11 ]. It is also necessary to accept a criterion in the form of a boundary value, the attainment of which means that the maximal, permitted loading of the joint has been achieved [ 12 , 13 ].…”

Influence of the theoretical load point on the value of the J - JQ integral during determination of fracture toughness of 2519 aluminium alloy

“…Interaction takes place between the materials. This connection is completely different than, for example adhesive joints [3][4] An example of such scientific research is the determination of fatigue life and fracture mechanics. This is because the precrack is generated by cyclic load.…”