Cyclic plasticity and low cycle fatigue life of metals

書誌事項

Cyclic plasticity and low cycle fatigue life of metals

Jaroslav Polák

(Materials science monographs, 63)

Elsevier, 1991

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注記

Includes bibliographical references

内容説明・目次

内容説明

Low cycle fatigue failures have been identified as being connected with the low number of repeated working cycles of equipment which usually results from start-up, shut-down operations, or some necessary interruption of ordinary use. The vast amount of research carried out so far has shown that only detailed knowledge of the proper mechanisms, and thus recognition of the important parameters governing the fatigue failure, can effectively improve engineering design procedures. This book concentrates on the physical metallurgy approach to elastoplastic cyclic straining and its relation to the fatigue life of metals. Recent breakthroughs in the understanding of the appropriate mechanisms is summarized and the importance of short crack growth is emphasised. Special attention is given to the identification of the basic mechanisms underlying cyclic plastic straining, damage evolution, fatigue crack initiation and growth, which results in final fracture. Design codes and fracture control plans are examined. The reliability and remaining fatigue life of structures and components in operation is assessed; the evaluation and choice of available materials is discussed; and finally the process of developing new materials or technologies with higher final product resistance to repeated cyclic loading is examined in detail. The work will be of interest to all those involved in the study and research of fatigue problems, and also design engineers wanting to keep abreast with modern techniques for improving fatigue design procedures.

目次

1. Introduction. 2. Stress and Strain in Cyclic Loading. Monotonic stress-strain curve. Stress-strain relationship in cyclic loading. Hysteresis loop. Cyclic hardening/softening curves. Cyclic stress-strain curve. 3. Cyclic Plasticity and Microstructure. Metals and simple alloys with f.c.c. structure. Metals and single phase alloys with b.c.c. structure. Other metals and single phase alloys. Multiphase materials. 4. Dislocation Mechanisms in Cyclic Plastic Straining. Athermal mechanisms in f.c.c. metals. Thermally activated cyclic straining. Dislocation mechanisms in particle strengthened metals. 5. Statistical Description of Cyclic Stress-Strain Response. Internal and effective stress in an elementary volume. Statistical approach. 6. Experimental Investigation of the Dynamics of Cyclic Plastic Straining. Stress-dip method. Stress and strain relaxation. Strain rate changes. Analysis of hysteresis loop shape. Evaluation of results using individual methods. 7. Cyclic Creep. Relevant experimental investigations. Dislocation arrangements. Mechanisms and models. 8. Fatigue Crack Initiation. Observation of surface relief evolution. Models of surface relief evolution. Mechanisms of crack initiation. Role of grain boundaries. Role of inclusions. 9. Growth of Fatigue Cracks. Fracture mechanics approach to fatigue crack growth. Crack growth under small scale yielding. General yield fatigue crack growth. Short crack growth. 10. Fatigue Life of Smooth Bodies. Strain controlled cycling. Plastic strain controlled cycling. Stress controlled cycling. Energy criterion. Evaluation of fatigue life of a smooth body using the fatigue process model. 11. Fatigue Life of Notched Bodies. Stress and strain concentration in a notched body. Fatigue life evaluation. 12. Variable Amplitude Loading. Phenomenological description. Analysis of load history. Sudden changes of strain amplitude. Cyclic plasticity in repeated block loading. Hypothesis of cumulative damage. Fatigue life prediction. 13. Effect of Depressed Temperature. Cyclic plasticity. Fatigue life. 14. High Temperature Low Cycle Fatigue. Cyclic plasticity at elevated temperatures. Fatigue life and its evaluation. Damage mechanisms. Fatigue life prediction. 15. Thermal and Thermomechanical Fatigue. The effect of temperature changes under constraint. Reversed plasticity and thermal cracking. Thermal ratchetting. 16. Multiaxial Loading. Multiaxial stress and strain. Cyclic stress-strain response. Fatigue life. 17. Computer Controlled Fatigue Testing. Role of the digital computer. Low cycle fatigue test. Crack growth test. Variable amplitude test. Other tests. 18. Characterisation of Low Cycle Fatigue Resistance of Metallic Materials. Basic characteristics. Review of materials properties. References. Subject Index.

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