. Calculate the debond length for the fiber composite in Problem 2. If one of the fibers fails below the crack at 10% greater than sfi in Problem 2, what will be the pullout length? (You must solve...

. Calculate the debond length for the fiber composite in Problem 2. If one of the fibers fails below the crack at 10% greater than sfi in Problem 2, what will be the pullout length? (You must solve Problem 2 first.)

. Consider a fiber composite having the following properties: Ef=320 GPa, Em =75 GPa, smu =150 MPa, Vf =0.4, r=0.6 mm, t=25 MPa, gm=2 J/m2,

n=0.22, and KM

C ¼ 3MPa  m1=2.

a. Would a straight-through crack (c=100 mm) be a partially or fully bridged crack at the ACK stress if sfu=1.2 GPa?

b. Parallel aligned fiber ceramic composites tend to develop periodic cracks in the matrix along the length of the specimen normal to the fibers prior to complete failure. Suppose that cracks were spaced the ‘‘debond length’’ apart and each crack was open the maximum crack opening, u0

at sN=sc. Calculate the engineering strain in the composite resulting just from all the cracks along the sample length. Compare this strain with the total purely elastic strain of the composite just before sc.