Problem 6. A rectangular strip of PMMA has length L = 100 mm, B= 3 mm, and W: 10 mm. A 1 mm edge crack is formed in the strip. Calculate the work to break (in J units) in tension if fracture energy is G,C= 575 J/m2, Young's modulus is E= 3.0 GPa, and Poisson's ratio is 2: 0.40. Take Y= 1.12 at a/W= 0.1, and neglect the small increase in specimen compliance due to the crack. Problem 5: The polypropylene has the following creep compliance function: D(t) = 1.4 t 0.1 [GPa-1] It is subjected to the following time-sequence of tensile stress at 35 C: 0 =0 (t