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Different Fracture Modes. Materials with Different Degrees of Brittleness. Ductile Fracture. (a) Failure by shear (glide) in a pure metal. (Reprinted with permission from D. Broek, Elementary Engineering Fracture Mechanics, 3rd ed. (The Hague, Netherlands: Martinus Nijhoff, 1982), p. 33.) (b) A point fracture in a soft single-crystal sample of copper. (Courtesy of J. D. Embury.).
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