The acrylic polymer from which Figure 7-30 was obtained has a critical fracture toughness of 2 MPa√m. It is subjected to a stress alternating between -10 and +10 MPa. Calculate the growth rate of a surface crack when it reaches a length of 5 x 10^-6 m if f = 1.0.

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Crack growth rate (m/cycle) 10-5 10-6 10-7 10-8 0.1 1.0 Stress-intensity factor range AK(MPa vm) 0.01