Question

Two planks each of 50 mm x 50 mm section are glued together the length to form a section 50 mm x 100 mm; and used as a beam. If the shear force at a section is 1000 N, what is the maximum shear stress on the glue?

• A. 0.15 MPa
• B. 0.3 MPa
• C. 0.6 MPa
• D. 2.4 MPa

Answer 1

The correct option is B 0.3 MPa


Shear stress at glue = $\frac{3}{2}\times {\tau }_{avg}$

$=\frac{3}{2}\times \frac{1000}{50\times 100}=0.3MPa$