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9. a) The stress field in the near vicinity of an elliptical crack front was shown to be in a state of plane strain.

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9. a) The stress field in the near vicinity of an elliptical crack front was shown to be in a state of plane strain. Without reciting the near field states of stress and displacement, explain how we proved the existence of the plane strain state. b) Show that the stress intensity factor. K = 0.64 a for a penny shaped crack in an infinite plate.

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