5. Calculations for the selection of rivets
If on the working drawing no details on the rivet are indicated, the following has to be taken into consideration:
The diameter of the rivet shank shall be at least one quarter of the thickness of all plates to be riveted - formula:
D = diameter of the rivet shank
1 - Diameter of the rivet shank
The length of the rivet shank has to be calculated on the basis of the thickness of all plates to be riveted:
The rivet shank must be longer than the thickness of all plates to be riveted by the measure of the "allowance" - formula:
L = length of the rivet shank
The allowance depends on the kind of rivet and on the field of application:
- Button closing heads in steel construction;
For rivets of diameters of the rivet shank up to 20 mm -
For rivets of diameters of the rivet shank of more than 20 mm -
- Button closing heads in boiler construction:
For rivets of rivet shank diameters up to 20 mm -
For rivets of rivet shank diameters of more than 20 mm -
- Countersunk closing heads in general:
Rivets which are too long must be cut - the right length of the rivet shank is the precondition of the quality of the closing head.
A button head rivet shall be calculated in order to connect two plates of 4 mm in thickness in steel construction:
1. Diameter of the rivet shank:
2. Length of the rivet shank:
Result: A rivet with the designation button head rivet 3 x 12 can be used for the intended connection.
A countersunk riveting of three 5 mm thick plates shall be made What rivet can be used for this purpose?
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