Fastener Pin Strength Calculation
Dowel pins are usually not or only lightly loaded, and their dimensions are often determined empirically.
The pin for connection is often squeezed and sheared, but the size of the pin can be determined according to the characteristics of the connection structure and experience, and then the corresponding strength is checked according to the force.
The diameter of the fastener pin should be determined according to the strength condition of being sheared when overloaded.
The formula for calculating the strength of fastener pins is as follows [2]:
Shear strength of pins
(1) In case 1, the installation position of the pin is shown in Figure 2.
(2) In case 2, the installation position of the pin is shown in Figure 3.
Crush strength of pins or connected parts
Note: The meanings of letters such as D and d in the formula are shown in Figure 2.
Figure 2 Force diagram of pin connection
image 3
L - the length of the pin
z - the number of pins
[σ]p - allowable extrusion stress (see Figure 4)
[τ]--Allowable shear stress (35 and 45 steels commonly used for common fastener pins = 80MPa, elastic fastener pins mostly use 65Mn = 120~130MPa)
