# Average shear stress in the glue joint between a spliced rod?

1. Jan 28, 2014

### kal854

Problem statement:
Two 3/4-in.-diameter nylon rods are spliced together by gluing a 2-in. section of plastic pipe over the rod ends, as shown in the figure. If a tensile force of P = 500 lb is applied to the spliced nylon rod, what is the average shear stress in the glue going between the pipe and rods?

Figure:

Obviously, {average shear stress} = {force} / {area}. But I am very confused when you take into account this splicing! Thank you in advance!

2. Jan 28, 2014

### SteamKing

Staff Emeritus
Assume there is no glue between the ends of the nylon rods, i.e., all of the glue is between the surface of the rod ends and the sleeve.

3. Jan 28, 2014

### kal854

How does that affect the problem? Is it as simple as {shear stress} = 500 lb / (pi/4 * (3/4)^2) ?

4. Jan 28, 2014

### SteamKing

Staff Emeritus
No, the glue doesn't cover the cross section ends of the rods, it covers the inner surface of the sleeve and bonds it to the 1" ends of the nylon rods.

5. Jan 28, 2014

### kal854

Ohh, so use the area that it covers to calculate the shear stress? And P for the force?

Thank you very much by the way!