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Plywood Minimum Bend Radius Design Considerations

Civil Engineering and Design

Plywood Minimum Bend Radius Design Recommended

Plywood, after softening, may be bent on a cold ventilated form. The part should be allowed to dry completely on the form. When bending plywood, drying may be hastened by laying a piece of coarse burlap over the radius bending form. To speed drying, a fan may be used to circulate air around the formed Plywood part.

In bending pieces of small radii or to speed up the bending of a large number of parts of the same curvature, it may be necessary to use a heated bending form. The surface temperature of this form may be as high as 149 °C (300 °F), if necessary, without danger of damage to the plywood. The plywood should be left on the heated form only long enough to dry to room conditions.

At 90° to Face Grain
At 90° to Face Grain
At 0° to 45° Face Grain
At 0° to 45° Face Grain
At 90° to Face Grain
At 90° to Face Grain
At 0° to 45° Face Grain
At 0° to 45° Face Grain

 

Plywood
Characteristics
10% Moisture
Bent on
Cold Mandrels
Thoroughly Soaked
in Hot Water, Bent
on Cold
Mandrels
Figure 1
Figure 2
Figure 3
Figure 4
Thickness
(inches)
Number of Layer
Plies
Minimum Bend Radius
(inches)
.035
3
2.0
1.1
0.5
0.1
.070
3
5.2
3.2
1.5
0.4
.100
3
8.6
5.2
2.6
0.8
.125
3
12.0
7.1
3.8
1.2
.155
3
16.0
10.0
5.3
1.8
.185
3
20.0
13.0
7.1
2.6
.160
5
17.0
11.0
6.0
2.0
.190
5
21.0
14.0
7.0
3.0
.225
5
27.0
17.0
10.0
4.0
.250
5
31.0
20.0
12.0
5.0
.315
5
43.0
28.0
16.0
7.0
.375
5
54.0
36.0
21.0
10.0

Reference:
Federal Aviation Administration,
Acceptable Methods, Techniques and Practices Aircraft Inspection and Repair.
Advisory Circular AC 43.13-1B

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