Q: How much can we bend 3/8-inch plywood forms?
A.: Probably to a circle with a 3-foot radius if you bend across the grain, or a circle with an 8-foot radius if you bend parallel to the grain. Even shorter radii can be used if the panels have no knots and have a short grain, or if they are wetted or steamed. Some panels might undergo a localized failure at excessively short radii, however. The American Plywood Association gives the following minimum bending radii:
|Parallel to grain||5'||6'||8'||12'||16'||20'|