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 ?
In this research, the effect of environmental temperature on the bonded joint was not tested.
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.
In most bonded joint applications, SMC has been shown to fail by delamination in the bond area, and this has become the de facto desired failure mode.
Other topics include the evaluation of a carbon thermoplastic to titanium bonded joint, the installation of adhesively bonded composites to repair carbon steel structure, and a composite bolted joint static strength prediction tool.
The adhesive bonded joint has been demonstrated to be 40 percent lighter and 50 percent less expensive to produce than the existing bolted joint configuration and also improves the ship signature and requires less in- service maintenance.
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.
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.
Thus, there is a great need for accelerated methods of assessing the durability of this region of the adhesively bonded joint.
The traditional methods used for joining composite pipe are the adhesive bonded joint and the butt-weld joint.
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.
environmental testing of mechanisms and bonded joints.