Abstract
This paper presents the results of an experimental study into single-lap joints. One part of the joint was made as a 3D printed polymer and had cylindrical tenons, while the other part was made of an aluminium flat bar having mortises whose diameter and distribution corresponded to the polymer tenons. In addition to the mechanical joint, a layer of double-sided VHB (Very High Bond) adhesive tape was also placed in the lap, thus creating a hybrid joint. In total, 80 specimens were made, which were divided into four groups: A—specimens with one tenon of different diameters, B—specimens with different number of tenons of the same diameter, C—specimens characterised by multi-stage operation and R—reference specimens, connected only by double-sided adhesive tape. The joints were subjected to uniaxial tensile tests. The force–displacement characteristics obtained and the energy required, up to the point of the failure of the joints, have been analysed in this paper. The four and six-stage joints designed can significantly increase the safety of the structures in which they will be used.
Highlights
In the paper [10], the authors used the Injection Clinching Joining (ICJ) method in which a pre-formed polymeric tenon is melted and formed in the mortise of a metal part. This type of mechanical joint is free of clearance
VHB double-sided adhesive tapes are characterised by low maximum stress, high strains to failure result in impressive fracture energy
This paper presents three groups of original and innovative single-lap joints that are
Summary
The use of 3D printing is becoming increasingly popular, for the fabrication of mock-ups and prototypes, and for industrial scale products. 3D printing technology facilitates production for multi-material products [1], reduces defects and lowers both production costs [2] and the need for repairs [3]. In the paper [10], the authors used the Injection Clinching Joining (ICJ) method in which a pre-formed polymeric tenon is melted and formed in the mortise of a metal part This type of mechanical joint is free of clearance. The polymer is melted under the influence of laser beam energy and penetrates the structure of the metal surface under the application of a specific joining pressure The advantage of this type of solution is that there is no correlation between the surface roughness Ra and the shear strength of the joint. Connections using double-sided adhesive tapes have received increasing attention [27,28,29,30,31] In many cases, they allow traditional liquid adhesives or mechanical joints to be replaced. The results of the laboratory tests for innovative joints, with multi-stage characteristics, are presented
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