Question

A steel tube of 25 mm OD is to be adhesively joined to another steel tube of 25 mm ID, using an adhesive. The assembly will operate at room temperature and an axial load of 12 kN will have to be supported. Using a safety factor of two:

a) calculate the minimum length of the lap joint (i.e. depth of overlap of the tubes) to achieve this strength requirement if epoxy is used.

Question 2 A steel tube of 25 mm OD is to be adhesively joined to another steel tube of 25 mm ID using an adhesive. The assembly will operate at room temperature and an axial load of 12 kN will have to be supported. Using a safety factor of two: a) calculate the minimum length of the lap joint (i.e. depth of overlap of the tubes) to achieve this strength requirement if epoxy is used. b) If the operating temperature increases to 130 °C, should you choose another adhesive. If so, which one, and shou ld the joint design change? Table 1: Structural Adhesive Properties Ероху Polyurethane Acrylic Cyanoacrylate Anaerobic Adhesive |Shear Strength 22 (MPа) Service Temperature (°C) Gap Limitation None (mm) Substrates 12 25 18.9 17.5 -55-12040- 90 -55-80 -55-150 70-120 0.5 0.6 None 25 Metals porous metals glass thermosets Most Most Most Most non- smooth, non- smooth, Bonded or plastics porous non- porous

Answer 1

as required above the minimum length of the lap joint and the second part also answered,i hope you will understand the concept,if you have any further doubts ,please let me know in comments below,a thumbs up will be really appreciated,thank you