Residual Stress and Stress Relaxation (Sagamore Army Materials Research Conference//Proceedings)

by Eric Kula

Publisher: Springer

Written in English
Cover of: Residual Stress and Stress Relaxation (Sagamore Army Materials Research Conference//Proceedings) | Eric Kula
Published: Pages: 535 Downloads: 648
Share This

Subjects:

  • Mechanical Properties Of Materials,
  • Science,
  • Science/Mathematics,
  • Nanostructures,
  • Science / Physics,
  • Physics,
  • Congresses,
  • Residual stresses,
  • Stress relaxation
  • The Physical Object
    FormatHardcover
    Number of Pages535
    ID Numbers
    Open LibraryOL9346039M
    ISBN 100306411024
    ISBN 109780306411021

In prestressed concrete elements, the stress relaxation losses in steel tendons are of paramount importance to structural design. In this work, experimental and numerical results show a clear relationship between stress relaxation and the presence of residual stresses . Handbook of Residual Stress and Deformation of Steel G. Totten Topics covered include recommended heat treating practices, methods for maintaining temperature uniformity dual heating, tips for preventing oxide formation, and techniques for measuring residual stresses. The field of stress analysis has gained its momentum from the widespread applications in industry and technology and has now become an important part of materials science. Various destructive as well as nondestructive methods have been developed for the determination of stresses. This timely book provides a comprehensive review of the nondestructive techniques for strain evaluation written by.   The residual stress (in Pa) distribution within the final deposits is shown in Figures 10 where Figure 10 shows the whole substrate and deposit, while Figure 11 shows a y–y cross section view with half of the deposits hidden to show the internal residual stress.

  The steel showed good resistance to residual stress relaxation under cyclic loading conditions, with only a 13% decrease despite cyclic load amplitudes at 50% of the 0˙2% proof stress in compression. Significant relaxation did occur at applied stress amplitudes of ∼80% of the 0˙2% proof stress in compression. Welding Deformation and Residual Stress Prevention provides a unique computational approach to the prediction of the effects of deformation and residual stress on materials. The goal is to provide engineers and designers with the ability to create their own computational system for predicting and possibly avoiding the problem altogether. Residual stresses can be defined as either macro or micro stresses and both may be present in a component at any one time. They can be classified as: Macro residual stress that develop in the body of a component on a scale larger than the grain size of the material. Micro residual stresses that vary on the scale of an individual grain. I. Analysis of the data showed higher residual stresses for Z and Herculite when the rings were cut at 10 min after light-activation, as compared with 1 hr or 24 hrs. This can be explained by the release of the residual stress through relaxation phenomena, likely within the polymer matrix and perhaps at the filler/matrix interface.

The article presents the stress reconstruction equations to be used for computational reconstruction of the stress fields from the measured strains for the destructive methods. It provides information on the sectioning, material removal, strain measurement, and chemical methods of residual stress . The SONATS laboratory uses destructive and non-destructive methods (X-ray diffraction, incremental hole drilling, mechanical relaxation method etc.) and provides comprehensive expertise of residual stress and analysis of metallic materials.

Residual Stress and Stress Relaxation (Sagamore Army Materials Research Conference//Proceedings) by Eric Kula Download PDF EPUB FB2

These proceedings, entitled RESIDUAL STRESS AND STRESS RELAXATION, address the nature of residual stresses and their measurements, the sources of residual stress, stress relaxation, sub-critical crack growth in the presence of residual stress, residual stresses and properties, and research in Cited by: These proceedings, entitled RESIDUAL STRESS AND STRESS RELAXATION, address the nature of residual stresses and their measurements, the sources of residual stress, stress relaxation, sub-critical crack growth in the presence of residual stress, residual stresses and properties, and research in Brand: Springer US.

Residual Stress and Stress Relaxation (Sagamore Army Materials Research Conference Proceedings) by Kula, Eric and a great selection of related books, art and collectibles available now at The Generation of Residual Stresses in Metal-Forming Processes.- Stress Relaxation in Spring Materials.- Problems with Residual Stress in the Railroad Industry.- Measurement of Residual Stresses in Ammunition.- Session VII.- X-Ray Residual Stress Measurement Systems for Army Material Problems.- Residual Stresses and Stress Relieving in Uranium.

Residual Stress and Stress Relaxation Eric Kula, Volker Weiss (eds.) The Army Materials and Mechanics Research Center in coop­ eration with the Materials Science Group of the Department of Chemical Engineering and Materials Science of Syracuse University has been conducting the Annual Sagamore Army Materials Research Conference since Papers of a symposium (see title) held in Cincinnati, OH, April, On methods for relaxation of undesirable residual stresses, i.e., cold working and vibratory stress relief, also treats unintentional relaxation of residual stress by cyclic stresses encountered in service.

Annotation copyrighted by Book News, Inc., Portland, OR. Keyword: Residual stress, relaxation of residual stress, modelling of residual stress relaxation INTRODUCTION Residual stresses are those stresses which exist along a cross-section of a component without applied external forces (Sigwart, ).

These can be inherent in the product from the manufacturing process or induced in the finished product. Although shrinkage development and early-age cracking resistance of HPC under restraint have been investigated, research on the stress Residual Stress and Stress Relaxation book of HPC with FA by ring tests is limited.

Restrained ring tests on the cracking resistance of HPC using FA as 0, 20, 35 and 50% by weight replacements of cement were conducted. The stress relaxation constitutive behavior reported here is a necessary input for the development of accurate thermomechanical models used to predict and minimize residual stresses and distortion.

Prediction of Residual Stresses Finite Element Calculation and Measurement of Thermal Stresses in High Strength Aluminum Alloys Advances toward the Standardization of Residual Stress Measurements III. Relaxation of Residual Stresses Relaxation of Residual Stresses Relaxation of Residual Stresses by Annealing or Mechanical Treatment Edition: 1.

Unlike using mean stress relaxation to simulate residual stress relaxation, Kodama measured residual stress decrease on the surface of shot-peened specimens using X-ray diffraction techniques, and proposed the following linear logarithm relationship (3) σ re N =A+m log N where σ re N is the surface residual stress after N cycles.

We propose and evaluate a model of relaxation which is based upon consideration of the nature of the microplastic deformation process. Residual surface stresses measured during fatigue of an Al T alloy are predicted from the cyclic stress amplitude, the initial magnitude of the residual stress and the ambient humidity during fatigue.

Introduction. The residual stress belonged to the internal stress of workpiece under the coupling thermo-mechanical effects, which could not be completely released to remain after cutting process, as reported by Wan et al.

().The residual stress was an important indicator of surface integrity, which affected the strength, performance life, dimensional accuracy and corrosion resistance. Residual stress relaxation can be observed in cases of static and cyclic loading.

Typically, four cases of residual stress relaxation may occur (Fig. 1) [7]. Stable residual stresses can be. Fig. 15 shows the relaxation stress that occurred at level 5 ( MPa), which is a stress level lower than the fatigue limit, of the shot peening conditions.

A great relaxation in the residual stress was also noticed here, both at the surface and beneath it, when compared to the original stress. Free 2-day shipping. Buy Sagamore Army Materials Research Conference Proceedings: Residual Stress and Stress Relaxation (Hardcover) at Abstract: The residual stress relaxation can be divided into two stages: The first cycle relaxation and the following cycles.

In both stages, residual stress relaxed considerably from the initial state. The aim of this study is to investigate the residual stress relaxation and microhardness reduction after first and second cyclic load. Residual Stress Relaxation and Fatigue Strength of AISI under Torsional Loading after Conventional Shot Peening, Stress Peening and Warm Peening.

Rainer Menig. Institut für Werkstoffkunde I, Universität Karlsruhe (TH), Karlsruhe, Germany. Search for more papers by this author. Book Description. While residual stress can be a problem in many industries and lead to early failure of component, it can also be introduced deliberately to improve lifetimes.

Knowledge of the residual stress state in a component can be critical for quality control of surface engineering processes or vital to performing an accurate assessment.

The residual stress relaxation can be divided into two stages: The first cycle relaxation and the following cycles. In both stages, residual stress relaxed considerably from the initial state.

The. Practical Residual Stress Measurement Methods provides the reader with the information needed to understand key residual stress concepts and to make informed technical decisions about optimal choice of measurement technique.

Each chapter, written by invited specialists, follows a focused and pragmatic format, with subsections describing the. Measurements to determine the relaxation of the ply-to-ply residual stress of the carbon-polyetherimide lay-up, with the highest level of residual stresses of the laminates tested ([90 4c /0 4c] s), have been presented previously [5].

It shows that the level of residual stress follows a power law with time. Prof. Schajer has published extensively on residual stress and related topics and recently edited the reference book Practical Residual Stress Measurement Methods.

He is a member of ASTM committee E on residual stress measurement and has been responsible for three major revisions of ASTM E Standard Test Method for Hole-Drilling Residual 5/5(1). New Challenges in Residual Stress Measurements and Evaluation.

Edited by: Caterina Casavola, Claudia Barile, Vincenzo Moramarco and Giovanni Pappalettera. ISBNeISBNPDF ISBNPublished   Creep and stress relaxation are two typical phenomena observed with viscoelastic materials and are often used to characterize materials.

Creep is the response of a viscoelastic material to a steady stress us consider the behavior of Model (a) in a creep analysis. When a spring and a dashpot are connected in series, the same stress σ will be applied to the two elements.

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. : Residual Stress: Measurement by Diffraction and Interpretation (Materials Research and Engineering) (): Noyan, Ismail C., Cohen, Jerome B.: BooksReviews: 4.

Handbook of Residual Stress and Deformation of Steel - Ebook written by George E. Totten. Read this book using Google Play Books app on your PC, android, iOS devices.

Download for offline reading, highlight, bookmark or take notes while you read Handbook of Residual Stress and. The results showed that the residual stress relaxation for first cycle was reached more than 40% of the initial residual stress and it depends on the load amplitude, and microhardness decreased.

Stress analysis is an active field in which many questions remain unsettled. Accordingly, unsolved problems and conflicting results are discussed as well.

The assessment of the experimentally determined residual and structural stress states on the static and dynamic behavior of materials and components is handled in a separate chapter. This book is Residual Stress Effects on Fatigue and Fracture Testing and Incorporation of Results Into Design, _(J.

O. Bunch and Michael R. Mitchell).pdf 05 December () Post a Review.residual stresses, this method, rather than dynamic impacting, was principally used in the present study of the relaxation of the residual stresses during subsequent fatigue cycling.

Fatigue loading Ex situ residual stress measurements Following indentation, specimens were subjected to a fatigue loading at a fixed stress ratio R / s.The article provides information on measurement of subsurface stress gradients and stress relaxation caused by layer removal.

The article concludes with a section on examples of applications of XRD residual-stress measurement that are typical of industrial metallurgical, process development, and failure analysis investigations undertaken at.