Mecánica - Construcción

    • The fundamental structural mechanics of elastic systems: Oscillations and flutter

      S/81

      Resumen del libro
      A.P.Leschenko has offered a completely new approach to structural mechanics, which allowed for a unique technique for structural engineering to be developed. This new method is based on the following three discoveries made by the author:

      — Phenomenon of separating torsional strains of elastic bars;

      — Specific law of analogy in stability and oscillation of elastic systems;

      — Principle of force factors pairing in structural mechanics.

      All actual approaches and theories of structural mechanics widely employ such an abstract concept as generalized force, neglecting, however, a definite and practical concept of external force factor. In author’s opinion, this breaks the interrelations between the external and internal forces acting on structures and the strains occurring in the structures, which leads to an implicit violation of the classical mechanics laws, namely the law of energy conservation, the Lagrange principle, and Newton’s laws. It should be stressed that Leschenko does not suggest that one concept should be simply replaced by the other, but interrelates the external action with other forces and factors concurrently acting on the structure.

      Thus, the author has proposed to consider any elastic system as based on three permanently acting factors: 1) external forces; 2) internal forces; and 3) elastic strains; and indicated the principles linking the effects of these factors. Leschenko has developed a graphical scheme (the so-called triad) for an analysis of elastic systems. The triad analysis of elastic systems has enabled to reveal great contradictions in the available structural calculations of plates, shells and bars. On the other hand, the new method has allowed for an adequate model of stress-and-strain state of constructions to be developed, which, for the first time ever, has made it possible to predict with a high accuracy the moment of structural failure.

      As main advantages of the new method we can list comparatively quick calculations of all types of structures, the examination and verification of design solutions, and the detection of critical loads and weak points of constructions. All these result in a considerable saving of materials, which is accompanied by improving the safety of constructions.

    • The fundamental structural mechanics of elastic systems: Stability

      S/81

      Resumen del libro
      A.P.Leschenko has offered a completely new approach to structural mechanics, which allowed for a unique technique for structural engineering to be developed. This new method is based on the following three discoveries made by the author:

      — Phenomenon of separating torsional strains of elastic bars;

      — Specific law of analogy in stability and oscillation of elastic systems;

      — Principle of force factors pairing in structural mechanics.

      All actual approaches and theories of structural mechanics widely employ such an abstract concept as generalized force, neglecting, however, a definite and practical concept of external force factor. In author’s opinion, this breaks the interrelations between the external and internal forces acting on structures and the strains occurring in the structures, which leads to an implicit violation of the classical mechanics laws, namely the law of energy conservation, the Lagrange principle, and Newton’s laws. It should be stressed that Leschenko does not suggest that one concept should be simply replaced by the other, but interrelates the external action with other forces and factors concurrently acting on the structure.

      Thus, the author has proposed to consider any elastic system as based on three permanently acting factors: 1) external forces; 2) internal forces; and 3) elastic strains; and indicated the principles linking the effects of these factors. Leschenko has developed a graphical scheme (the so-called triad) for an analysis of elastic systems. The triad analysis of elastic systems has enabled to reveal great contradictions in the available structural calculations of plates, shells and bars. On the other hand, the new method has allowed for an adequate model of stress-and-strain state of constructions to be developed, which, for the first time ever, has made it possible to predict with a high accuracy the moment of structural failure.

      As main advantages of the new method we can list comparatively quick calculations of all types of structures, the examination and verification of design solutions, and`the detection of critical loads and weak points of constructions. All these result in a considerable saving of materials, which is accompanied by improving the safety of constructions.

    • The fundamental structural mechanics of elastic systems: Strength

      S/81

      Resumen del libro
      A.P.Leschenko has offered a completely new approach to structural mechanics, which allowed for a unique technique for structural engineering to be developed. This new method is based on the following three discoveries made by the author:

      — Phenomenon of separating torsional strains of elastic bars;

      — Specific law of analogy in stability and oscillation of elastic systems;

      — Principle of force factors pairing in structural mechanics.

      All actual approaches and theories of structural mechanics widely employ such an abstract concept as generalized force, neglecting, however, a definite and practical concept of external force factor. In author’s opinion, this breaks the interrelations between the external and internal forces acting on structures and the strains occurring in the structures, which leads to an implicit violation of the classical mechanics laws, namely the law of energy conservation, the Lagrange principle, and Newton’s laws. It should be stressed that Leschenko does not suggest that one concept should be simply replaced by the other, but interrelates the external action with other forces and factors concurrently acting on the structure.

      Thus, the author has proposed to consider any elastic system as based on three permanently acting factors: 1) external forces; 2) internal forces; and 3) elastic strains; and indicated the principles linking the effects of these factors. Leschenko has developed a graphical scheme (the so-called triad) for an analysis of elastic systems. The triad analysis of elastic systems has enabled to reveal great contradictions in the available structural calculations of plates, shells and bars. On the other hand, the new method has allowed for an adequate model of stress-and-strain state of constructions to be developed, which, for the first time ever, has made it possible to predict with a high accuracy the moment of structural failure.

      As main advantages of the new method we can list comparatively quick calculations of all types of structures, the examination and verification of design solutions, and`the detection of critical loads and weak points of constructions. All these result in a considerable saving of materials, which is accompanied by improving the safety of constructions.

    • Resistencia de materiales. Selección de problemas de elevada dificultad con soluciones detalladas: estabilidad

      S/81

      En el presente libro se resuelven problemas que, en su mayoría, se salen del marco de las exigencias tradicionales del curso de resistencia de materiales, tanto por su complejidad como por su planteamiento. Los ejemplos recopilados, de especial dificultad, amplían la visión del lector y le permiten ver la relación de la resistencia de materiales con otras disciplinas. Todos los problemas van acompañados de soluciones detalladas. En esta edición española, basada en la quinta edición rusa, aparecen nuevos problemas relacionados con el desarrollo de los métodos numéricos y con la aplicación técnica de los materiales compuestos.

    • Resistencia de materiales. Selección de problemas de elevada dificultad con soluciones detalladas: estado tensional compuesto, criterios de resistencia, anisotropía, preguntas y problemas variados

      S/81

      En el presente libro se resuelven problemas que, en su mayoría, se salen del marco de las exigencias tradicionales del curso de resistencia de materiales, tanto por su complejidad como por su planteamiento. Los ejemplos recopilados, de especial dificultad, amplían la visión del lector y le permiten ver la relación de la resistencia de materiales con otras disciplinas. Todos los problemas van acompañados de soluciones detalladas. En esta edición española, basada en la quinta edición rusa, aparecen nuevos problemas relacionados con el desarrollo de los métodos numéricos y con la aplicación técnica de los materiales compuestos.

    • Resistencia de materiales. Selección de problemas de elevada dificultad con soluciones detalladas: tracción, compresión, torsión, propiedades geométricas de las secciones, flexión

      S/81

      En el presente libro se resuelven problemas que, en su mayoría, se salen del marco de las exigencias tradicionales del curso de resistencia de materiales, tanto por su complejidad como por su planteamiento. Los ejemplos recopilados, de especial dificultad, amplían la visión del lector y le permiten ver la relación de la resistencia de materiales con otras disciplinas. Todos los problemas van acompañados de soluciones detalladas. En esta edición española, basada en la quinta edición rusa, aparecen nuevos problemas relacionados con el desarrollo de los métodos numéricos y con la aplicación técnica de los materiales compuestos.

    • Mechanics of Elastic-Plastic Fracture: Special Problems of Fracture Mechanics

      S/85

      This book, comprising two volumes, presents current research and original investigations in the theory of large cracks capable of propagating and initiating partial or complete fracture in deformable solids. The book covers a wide variety of problems relating to the behavior of bodies with cracks, and ranges from crack extension criteria to the solution of complex problems of fracture mechanics. Also, the authors consider critical and subcritical states of equilibrium under single, multiple, thermal and dynamic loadings in elastic, viscoelastic, elastic-plastic and piezoelectrical bodies with cracks. Experimental methods for the determination of crack-resistance characteristics of materials are exposed.

      The second volume, which we present to the reader, contains a systematic study of special problems of fracture mechanics, among which are the effects of hydrogen-containing environment, the corrosion in presence of electromagnetic fields, thermal and dynamical loadings, electromagnetic interaction in piezoelectrical bodies, and others. The solution of these problems is entailed with considerable mathematical difficulties. For this reason, a high level of mathematical knowledge is required. The first volume, published as a separate book, contains the main criteria and methods of elastic and elastic-plastic fracture mechanics.

      The book is intended for scientists and practicing engineers working in the field of fracture mechanics and also for post-graduates and senior students specializing in solid mechanics and strength of machine parts.

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