This question should take about 10 minutes to complete. It is an introductory level question.
A sheet of glass measuring 2 m by 200 mm by 2 mm contains a central slit parallel to the 200 mm side. The sheet is restrained at one end and loaded in tension with a mass of 500 kg.
What is the maximum allowable length of slit before fracture occurs?
Assume the following material property values: E = 60 GPa, surface energy is 0.5 J/m2, Poissons ratio = 0.25 and the fracture stress of sound glass is 170 MPa.