ANNEX 3 Bending Strength Test of Bulkhead Laminates of Structural Plywood

1. Bending Strength Test of Bulkhead Laminates of Structural Plywood

(1) Specimen

As shown in Fig 3.1, 2 pieces of rectangular test specimens of which dimension is 50 mm at the right angle to fibrous direction of the plywood's surface and ĪLᾼ Ñ JL mm at the parallel to

fibrous direction, and 50 mm at the parallel to fibrous direction and

ĪLᾼÑJLL mm

at the right

angle to fibrous direction, are to be taken from each test sample, respectively.

Fig 3.1 Bending Strength Specimens of Structural Plywood

(2) Test Procedures

Test is to be carried out under the parallel condition between the span direction and fibrous di-

rection of are to be

the plywood's surface as shown in Fig 3.2. Upper and lower measured and then calculate the modulus of bending elasticity

load of linear region and bending strength

by the following formula.

Fig 3.2 Bending Strength Specimens of Structural Plywood

Modulus of bending elasticity = ᾬᾨĮ

ÜĨᾎᾜĮ←

NNÕcmĪŃ

Bending strength =

ĮČᾎᾨ ÜĪᾎᾜĪ

NNÕcmĪŃ

Čᾎ : Maximum load(N)

ᾨ : Length of span(cm )

ᾎ : Width of specimen(cm )

ᾜ : Thickness of specimen(cm )

ᾬ : Difference between upper load and lower load of linear region(N)

← : Deflection at the center of span corresponding to ᾬ .

34 Guidance relating to the Rules for the Classification of FRP Ships 2014