The Influence of Selected Test Conditions on the Impact Strength of Adhesively Bonded Connections

Abstract

The conditions of adhesive connections testing can significantly affect the recorded findings. The standards, under which the investigations are conducted, do not take into account numerous factors that can greatly influence the outcome of the tests. Moreover, the research parameters in the standards are not specified. It is not defined in what manner their change, or any failure to comply with the standards, will affect test results. This article presents the results of experimental research, completed with numerical simulations, designed to test to what extent the recorded impact strength of adhesive connections is affected by the stiffness of the test stand, and the speed and energy of the impactor. In the experimental research, the authors used block samples whose substrates were made of an aluminum alloy. The elements of the samples were bonded by means of three different epoxy adhesives. The models used in numerical calculations were built on the basis of the real dimensions of the specimens used in this experimental research. As a result of the performed tests and conducted calculations, it was found that the use of test stands of lesser stiffness resulted in an increased registered impact strength due to an increased energy value of elastic deformations.

The Influence of Mixing Methods of Epoxy Composition Ingredients on Selected Mechanical Properties of Modified Epoxy Construction Materials

“…Tensile strength was analyzed in the study. In general, strength means resistance to external factors, in this case, tensile (destructive) force, which is very important from the point of view of designing adhesive joints [ 1 ].…”

“…The strength of structural adhesive joints depends on many technological and constructional factors. The most important factors, the optimization of which may significantly increase the strength of structural adhesive joints, include the method of preparing the surfaces of the bonded elements, the type of adhesive used and the method of its preparation, the manufacturing technology considering the geometry of the joint, the method of loading and the conditions of curing the adhesive joint [ 1 , 2 ].…”

Quality Analysis of Bonded Joints in the Renovation of Plastic Automotive Parts

“…The impact strength of bonded joints was studied by Godzimirski, who used three different epoxy adhesives in his experiments. At the same time, he used models for numerical calculations, where the result was an increase in impact strength due to increased elastic strain values [43].…”

Adhesive Joint Degradation Due to Hardener-to-Epoxy Ratio Inaccuracy under Varying Curing and Thermal Operating Conditions

“…[ 8 , 9 , 10 , 11 , 12 ]. The conditions of preparing the joints also play a significant role in obtaining strong and reliable joints [ 13 , 14 ], as well as the manufacturing technology, taking into account the geometry of the joint, the method of loading the joint and the conditions of curing the adhesive joint [ 15 , 16 , 17 ]. The strength of the adhesive bond is also affected by various types of defects in the form of non-joined areas.…”