Download e-book for iPad: Advances in Engineering Plasticity and its Applications by W. B. Lee

By W. B. Lee

Classical plasticity is a good confirmed area of mechanics and engineering, offering the foundation for lots of engineering structural layout, production approaches and average phenomena. New vital features are rising within the interdisciplinary method of micro-, meso- and macro-mechanics, and during research, experiments and computation.
The interplay of mechanics and fabrics scientists is introducing great adjustments within the disciplines, in order that the potential of fabrics being processed at the microscale to accomplish the specified macroscopic homes is swiftly approaching.
A finished evaluation at the newest advancements in either macroplasticity and microplasticity theories, their interactions and purposes in a number of engineering disciplines reminiscent of stable mechanics, structural research and geo-mechanics, fabrics technological know-how and expertise, and steel forming and machining, is given during this quantity. Case reviews written through foreign specialists concentrate on facets similar to the purposes of plasticity in interdisciplinary and non-conventional components. The one hundred fifty papers supply a present and precious reference resource at the most recent advances for either examine employees and engineers within the a variety of fields of plasticity.

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In the elastic-damage theory, the inelastic deformation is described entirely as elastic-damage of the material. The inelastic behavior of concrete materials is reflected only by the stiffness degra­ dation, while there is no permanent deformation in the material after a complete unloading. However, permanent deformation is an important feature of the inelastic deformation of concrete materials, and this has been observed in many experiments. Despite this, the elastic-damage theory provides a useful technique to relate the mechanism of deformation obtained in a micromechanical study and observed in experiments to the macro-constitutive equations in the continuum mechanics.

This approach requires considerations from a microscopic viewpoint in order to develop the basic understanding of the underlying mechanisms. With this understanding, microstructure study can be used to quantify the influence of interfaces at a larger scale with respect to the overall structural engineering behavior. This is described briefly in the paper by Chen and Cohen [14]. 6. ELASTIC-PLASTIC-DAMAGE THEORY AS THE NEXT LOGICAL STEP Although a large number of constitutive models for concrete materials have been developed in recent years, realistic applicative models that are rational, reliable and practical and can be directly implemented into a general purpose finite element analysis code with relative ease, are still very limited.

117, No. 3, pp. 653-673, March (1991). 14. W. F. D. Cohen, Micromechanical Considerations in Concrete Constitutive Modeling, Proceedings of 10th ASCE Structures Congress, San Antonio, TX, J. , May 13-15, pp. 270-273 (1992). 15. F. Chen, Concrete Plasticity: Macro and Micro Approaches, Structural Engineering Report No. CE-STR-92-25, School of Civil Engineering, Purdue University, West Lafay­ ette, IN, 63 pp. (1992). B. V. All rights reserved. 35 ON CONSTITUTIVE RELATIONS OF SHAPE MEMORY ALLOYS Hwang Keh-Chih, Sun Qing-Ping Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China ABSTRACT In this paper, a micromechanics constitutive theory recently developed by the authors is used to describe the constitutive behavior of polycrystalline shape memory alloys under various thermomechanical loading conditions.

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