The PMMA window described in Exercise 2.9 has a contained crack of length 2a=0.5 mm. If the maximum tensile stress that is anticipated in the window is σ=20 MPa, will the crack propagate? Choose an appropriate equation for crack propagation from Appendix B10 and data for the fracture toughness of PMMA from Appendix A6 to calculate the length of crack that is just unstable under this tensile stress.

Data From Exercise 2.9

Data From Appendix A6

Data From Appendix B10

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