Bonded Joint

Bonded Joint

 

a permanent joint between parts of machines, building structures, furniture, and products of light industry; formed by an adhesive. It can hold together various materials, including materials of different types, by providing uniform distribution of stresses. Bonded joints are used in the fabrication of articles from steel, aluminum, brass, textolite, Micarta, glass, plywood, wood, cloth, plastic, cured rubber, and other materials that can be joined in various combinations. In the assembly of equipment and the construction of buildings such joints can replace welding and riveting.

Bonded joints are made with phenol formaldehyde, epoxy, and silicone cements. The thickness of the adhesive interlayer is usually 0.01–0.1 mm. Joints that experience shear or uniform separation strain are usually bonded. For steel articles such joints have a maximum shear strength of 20–35 meganewtons per sq m (or 200–350 kilograms-force per sq cm), and in a number of cases it is substantially higher. The strength of the glue line between plastics usually exceeds that of the materials themselves. Among the disadvantages of bonded joints are the shortness of their life compared to welded and riveted joints, particularly in the case of abrupt temperature changes, and their low strength under conditions of unilateral nonuniform separation strain (peeling off). Under such conditions the best results are achieved by using combination bonded-riveted or bonded-welded joints.

A. A. PARKHOMENKO

References in periodicals archive ?
It is ideal under these conditions to observe and evaluate the appearance of a glueline of a bonded joint without opening or testing the joint.
The traditional methods used for joining composite pipe are the adhesive bonded joint and the butt-weld joint.
Kovacevic, "Dynamic analysis of adhesively bonded joint under solid projectile impact," International Journal of Adhesion and Adhesives, vol.
Specimens composed of two pieces of beech wood each with dimensions of 150 by 20 by 15 mm were welded together to form a bonded joint of 150 by 20 by 30 mm by exercising a vibrational movement of a wood surface against the other at a frequency of 100 Hz.
The aim of this study was to show the excellent impact behavior of a bonded joint by taking into account the viscoelastic properties of the adhesive.
The use of adhesively bonded joint, which uses metallic, composite, and ceramic materials, is of great interest to many industrial sectors including aerospace, automotive, marine, machine tools, package, and appliance industries.
In this study, adhesively bonded joint types were made using the non-linear finite element model ANSYS (version 15) package program [39].
Its Young's modulus is accordingly obtained by ensuring that the axial stiffness of FRP in the simulations is the same as that in the tests because the debonding behavior only occurs in the body of concrete around the FRP-concrete bonded joint [19, 21,34].
It is therefore necessary to understand the bondline cracking behavior of an adhesively bonded joint and the influence of the mechanical fastener on it.
The movement of the adhesive in forming the bonded joint is observed from the time of applying the adhesive to the formation of tight compound.
Four types of specimens for each material were prepared and tested: (i) bonded joints of untreated composite adherends using basic adhesive; (ii) surface-modified adherends and formation of bonded joint using basic adhesive; (iii) surface-modified adherends and formation of bonded joint using nanofilled adhesive; (iv) surface-modified adherends and formation of bonded joint with nanofilled adhesive followed by exposing the joints to EBRs.
The panels are assembled using bonded joint technology to provide a completely damp-proof container that is impermeable to vapour.