Download Free Cyclic Deformation And Fatigue Behavior Of Hardened Steels Book in PDF and EPUB Free Download. You can read online Cyclic Deformation And Fatigue Behavior Of Hardened Steels and write the review.

To investigate the fatigue behavior of cyclically softening and hardening steels under multiaxial elastic-plastic strains, axial strain, and shear strain controlled fatigue tests under constant amplitude loading were carried out. S-N curves under axial strain and torsional pure shear as well as under combined axial strain and shear, in and out of phase, were obtained for the cyclically softening high-strength steel 30Cr-Ni-Mo 8 (similar to AISI Type 4340) and the cyclically hardening stainless steel X 10Cr-Ni-Ti 18 9 (AISI Type 321) in the region of low-cycle fatigue.
This book provides practicing engineers, researchers, and students with a working knowledge of the fatigue design process and models under multiaxial states of stress and strain. Readers are introduced to the important considerations of multiaxial fatigue that differentiate it from uniaxial fatigue.
Cyclic deformation behavior and fracture mechanisms of Ferrovac E iron under low cycle fatigue conditions are studied at temperatures ranging from 23 to 540 C, cyclic deformation rates from 4 x 10-4 to 2 x 10-1 s-1, and strain ranges from 0.010 to 0.040. The stress response during strain cycling shows three stages, primary hardening, steady state behavior, and secondary hardening. Both the onset and duration of secondary hardening are dependent on deformation rate and temperature through the process of dynamic strain aging. Stress response sensitivity to deformation rate increases under conditions which permit changes in both internal and effective stress components. There is a variation in the internal stress component at the blue brittleness temperature (370 C) caused by an increase in total dislocation density due to dynamic strain aging. However, at higher temperatures (485 to 540 C) a variation in the internal stress component is caused by accelerated thermal recovery. Steady state cyclic deformation in this temperature range is observed to be consistent with models for steady state creep and hot-working. The fracture mechanism and fatigue life are mainly influenced by the characteristics of stress and strain redistribution and the inhomogeneity of plastic-strains. This inhomogeneity of deformation results from dynamic strain aging effects during fatigue. A parameter which controls stress response, fatigue behavior, and fracture mode under dynamic strain aging conditions is presented.
Annotation Examines the factors that contribute to overall steel deformation problems. The 27 articles address the effect of materials and processing, the measurement and prediction of residual stress and distortion, and residual stress formation in the shaping of materials, during hardening processes, and during manufacturing processes. Some of the topics are the stability and relaxation behavior of macro and micro residual stresses, stress determination in coatings, the effects of process equipment design, the application of metallo- thermo-mechanic to quenching, inducing compressive stresses through controlled shot peening, and the origin and assessment of residual stresses during welding and brazing. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Applied Optimal Design Mechanical and Structural Systems Edward J. Haug & Jasbir S. Arora This computer-aided design text presents and illustrates techniques for optimizing the design of a wide variety of mechanical and structural systems through the use of nonlinear programming and optimal control theory. A state space method is adopted that incorporates the system model as an integral part of the design formulations. Step-by-step numerical algorithms are given for each method of optimal design. Basic properties of the equations of mechanics are used to carry out design sensitivity analysis and optimization, with numerical efficiency and generality that is in most cases an order of magnitude faster in digital computation than applications using standard nonlinear programming methods. 1979 Optimum Design of Mechanical Elements, 2nd Ed. Ray C. Johnson The two basic optimization techniques, the method of optimal design (MOD) and automated optimal design (AOD), discussed in this valuable work can be applied to the optimal design of mechanical elements commonly found in machinery, mechanisms, mechanical assemblages, products, and structures. The many illustrative examples used to explicate these techniques include such topics as tensile bars, torsion bars, shafts in combined loading, helical and spur gears, helical springs, and hydrostatic journal bearings. The author covers curve fitting, equation simplification, material properties, and failure theories, as well as the effects of manufacturing errors on product performance and the need for a factor of safety in design work. 1980 Globally Optimal Design Douglass J. Wilde Here are new analytic optimization procedures effective where numerical methods either take too long or do not provide correct answers. This book uses mathematics sparingly, proving only results generated by examples. It defines simple design methods guaranteed to give the global, rather than any local, optimum through computations easy enough to be done on a manual calculator. The author confronts realistic situations: determining critical constraints; dealing with negative contributions; handling power function; tackling logarithmic and exponential nonlinearities; coping with standard sizes and indivisible components; and resolving conflicting objectives and logical restrictions. Special mathematical structures are exposed and used to solve design problems. 1978
The Second International Symposium on Defects, Fracture and Fatigue took place at Mont Gabriel, Quebec, Canada, May 30 to June 5, 1982, and was organized by the Mechanical Engineering Department of McGill University and Institute of Fracture and Solid Mechanics, Lehigh University. The Co-Chairmen of the Sympo sium were Professor G.C. Sih of Lehigh University and Professor J.W. Provan of McGill University. Among those who served on the Organizing Committee were G.C. Sih (Co-Chairman), J.W. Provan (Co-Chairman), H. Mughrabi, H. Zorski, R. Bullough, M. Matczynski, G. Barenblatt and G. Caglioti. As a result of the interest expressed at the First Symposium that was held in October 1980, in Po land, the need for a follow-up meeting to further explore the phenomena of mate rial damage became apparent. Among the areas considered were dislocations, per sistent-slip-bands, void creation, microcracking, microstructure effects, micro/ macro fracture mechanics, ductile fracture criteria, fatigue crack initiation and propagation, stress and failure analysis, deterministic and statistical crack models, and fracture control. This wide spectrum of topics attracted researchers and engineers in solid state physics, continuum mechanics, applied mathematics, metallurgy and fracture mechanics from many different countries. This spectrum is also indicative of the interdisciplinary character of material damage that must be addressed at the atomic, microscopic and macroscopic scale level.