Joints design factors

E, Joint quality factor P Design gauge pressure kPa Ibf/im... 

What is important for this space truss problem depends on which of the various technical issues influence the design. Is stiffness an issue Is strength an issue If so, why Is buckling an issue Can fatigue be a problem Or corrosion Thermal expansion or joints Those factors are listed in Figure 7-23. 

When vessels are designed to other international standards, the standard should always be consulted to determine the rules for joint efficiency, as different codes treat it in different ways. For example, welded-joint efficiency factors are not used, as such, in the design equations given in BS PD 5500 instead, limitations are placed on... 

The ultrasonic welding of ETFE can be achievedl" with a weld factor of 0.8. The success of this technique is dependent on joint design and welding parameters such as the contact time and pressure. Typical welding conditions include a contact pressure of 170 kPa and a cycle time of 2 secs. 

Ej Joint quality factor F Design gauge pressure kPa Ibf/in"... 

P(6) For an adhesively bonded connection and a bonded insert joint designed by testing, the following partial material safety factors shall be used ... 

Typically the structure and the dimensions of the members to be joined are fixed before the joint design procedure is commenced, i.e. the joint has to be designed using adherends which have a structure determined by requirements other than those arising from the joint design. However, some important factors concerning adherends should always be considered when designing bonded joints between composite adherends. 

Evidence suggests that the failure behavior of thermoplastics is much the same as for thermoset composites. High joint efficiencies can be obtained with suitable consideration to the joint design, fastener type, and environmental factors. In addition to mechanical and adhesive joining, thermoplastic composites can also be heat welded depending on the concentration and type of fillers within the composite. 

Lap joints are the most commonly used adhesive joint, because they are simple to make, are applicable to thin adherends, and stress the adhesive to be stressed in shear. However, the simple lap joint causes the adhesive to be stressed in shear. In this design, the adherends are offset, and the shear forces are not in-line, as was illustrated in Figure 7.15. This factor results in cleavage stress at the ends of the joint, which seriously impairs its efficiency. Modifications of lap-joint design (Figure 7.17) include ... 

Spin welded ABS joints can have straight 90° mating surfaces, or surface can be angled, molded in a V-shape, or flanged. The most important factor in the quality of the weld is the joint design. The area of the spinning part should be as large as possible, but the difference in linear velocity between the maximum and minimum radii should be as small as feasible. 

Joint design - cylindrical joints C WATSON Factors affecting joint performance specimen calculation... 

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