The modulus of rigidity of agglomerated cork of 11 mm thickness and 270 kg/[m.sup.3] of density was found by Reis et al.

The modulus of rigidity is of 1.54 MPa for C190 and 2.75 MPa for C190(R), which is an increase of 78% when compared to C190, C190 has a linear behavior up to 6.5 mm of displacement then a nonlinear behavior until rupture.

where G is the apparent modulus of rigidity for the entire specimen (N/[mm.sup.2]), t is the specimen thickness (mm), and [P.sub.p]/[DELTA] is the slope of the force-deformation curve below proportional limit load (N/mm).

Modulus of rigidity determined from Test Method A is a composite estimate of rigidity throughout the entire thickness of the non-homogenous plywood specimen.

The

modulus of rigidity (G) is estimated from modulus of elasticity (E) as G = E/16.

This paper presents results of a study dealing with the following properties of small, clear red oak specimens obtained from Alabama, which were not investigated previously for the reported species: tension parallel to grain, pure flexural stiffness,

modulus of rigidity ([G.sub.LT]), and toughness.

Edgewise

modulus of rigidity and pure edgewise modulus of elasticity properties of southern pine plywood and LVL specimens of different depths tested with central loading at three different spans but at the same span-to-depth ratio of 14.

Likewise, the bending forces acting on the ends of the rail resulting from the twisting of the side rails along their longitudinal axis may be ignored because of their small magnitude -- owing partially to the small rotation of the ends of the front rail and partially to the (relatively) low

modulus of rigidity of wood of the side rails.