ductile fracture

mechanics

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fracture mechanics

  • Figure 1: The position vector  x  and the velocity vector  v  of a material point, the body force fdV acting on an element dV of volume, and the surface force TdS acting on an element dS of surface in a Cartesian coordinate system 1, 2, 3 (see text).
    In mechanics of solids: Dislocations

    …could be going on in ductile crystals and could provide an explanation of the low plastic shear strength of typical ductile solids, much as Griffith’s cracks explained low fracture strength under tension. In this case, the displacement on the dislocated surface corresponds to one atomic lattice spacing in the crystal.…

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fatigue, in engineering, manifestation of progressive fracture in a solid under cyclic loading as in the case of a metal strip that ruptures after repeated bending back and forth. Fatigue fracture begins with one or several cracks on the surface that spread inward in the course of repeated application of forces until complete rupture suddenly occurs when the small unaffected portion is too weak to sustain the load. Structural and machine parts subject to vibrations and other cyclic loading must be designed to avoid fatigue fracture.

This article was most recently revised and updated by Amy Tikkanen.