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PRELIMINARY EXAMINATIONS OF IMPACT STRENGTH OF ADHESIVE LAP JOINTS DOI:10.15199/160.2019.4.2


  In the currently designed and used constructions, apart from static and fatigue loads, adhesive joints can also be exposed to impact loading. An example of this type of a construction is modern cars in which numerous elements, such as door panels, car bonnets and a number of elements made with plastics, are manufactured using adhesive bonding technology [7, 9, 11]. In the event of a collision or a car accident, adhesive joints in the construction are frequently impact loaded. In order to properly design and ensure crashworthiness of glued structures, investigations are conducted as well as making estimates of impact strength of the used connections. So far a limited number of procedures has been developed to determine parameters of the impact strength of adhesive joints, taking into account a wide range of application areas, some of which have been adopted as normative procedures. The techniques using pendulum hammers are the most commonly used methods for relatively low speeds of impact loading. By using a pendulum hammer as a test device, it is possible to determine the energy lost during the destruction of the sample, i.e. the impact strength of the connection [10] based on the difference in the pendulum height prior to and after the impact. The majority of examinations are performed using the standard research technique described in PN-ISO 9653 [8]. However, the research conducted with this method is difficult to implement in a repetitive manner due to the fact that it is essential to maintain an extremely accurate behaviour of the sample parameters and the test conditions [1, 5]. Therefore, other research techniques are pursued, e.g. in the available literature it is possible to find descriptions of tests carried out on lap joint samples, in which the joint is sheared during the test [2, 3, 4]. The [...]

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