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Unformatted text preview: 1.4. PLASTICITY Take a small steel rod. Bend it. When the deflection is small, the rod will spring back to its original shape when you release the load. This is elas- ticity. When the deflection is sufficiently large, a permanent deformation will remain when the load is released. That is plasticity. The load-deflection relationship of an ideal plastic material is shown in Fig. 1.4:1(a). For an ideal plastic material, the deflection is zero when the load is smaller than a critical value. Then, when the load reaches a critical value, the de- flection continues to increase (the material flows) as long as the same load remains. If, at a given deflection, the load becomes smaller than the criti- cal value, then the flow stops. There is no way the load can be increased beyond the critical value....
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- Fall '05