By André Zaoui (auth.), G. Beck, S. Denis, A. Simon (eds.)
ISBN-10: 9400911432
ISBN-13: 9789400911437
ISBN-10: 9401070075
ISBN-13: 9789401070072
Residual stresses are consistently brought in fabrics after they are produced, or after they endure non-uniform plastic deformation in the course of use. The situations that could reason residual stresses are consequently various. Residual stresses exist in all fabrics and, counting on their distribution, can playa important function (for instance, compressive floor pressure) or have a catastrophic impression, in particular on fatigue behaviour and corrosion homes. the topic of residual stresses took shape round 1970 with the advance of ways to degree macroscopic deformations throughout the machining of fabrics or on an atomic scale through X-ray diffraction. those options have made huge development within the final twenty years. The conferences equipped in numerous international locations (Germany, France, Japan, and so forth. ) have mostly contributed to this growth, aided by way of the varied exchanges of data and data to which they've got given upward push. stories of the formation of residual stresses started extra slowly, yet have stepped forward with the emergence of more and more real looking versions of fabrics behaviour and with entry to ever extra strong codes for numerical calculations. successive conferences for discussing this subject were held in Europe. the 1st, held in 1982 in Nancy (France), consisted of 30 individuals from five international locations. the second one was once held in Linkoping (Sweden) in 1984, with eighty contributors of sixteen nationalities. It was once determined to carry a primary overseas convention, ICRS, to deal with all features of the matter. Held in 1986 in Garmisch-Partenkirschen (FRG), it was once an meeting of neady three hundred contributors from 21 countries.
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Residual stresses are continually brought in fabrics once they are produced, or once they suffer non-uniform plastic deformation in the course of use. The conditions which can reason residual stresses are for this reason quite a few. Residual stresses exist in all fabrics and, looking on their distribution, can playa necessary position (for instance, compressive floor tension) or have a catastrophic influence, specially on fatigue behaviour and corrosion houses.
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Extra resources for International Conference on Residual Stresses: ICRS2
Sample text
According to (63). is given by : ! o = ~ «;:> - ~) (69) since. with S = £. = £ • 1 reduces t~ idenlity and ! is no more random; in addition. in that case. (65) yields! = <;. >. If no plastic flow occurred during unloading. the stress distribution was. just before. ,. - > - ~ «£ p p (70) £ ) Now, the question is : are we allowed, in order to predict the generation of internal stresses during plastic flow, just to use (70) after time derivation and integrate this "interaction law" into a modeiling procedure also using average relationships between local and macroscopic variable aqd the plastic constitutive equations of the grains ?
BO «Bo>-1 «~:> + <~ ~o ~F» ... From the second eqn (62), we see that the responsible for an additional contribution (see eqn (53», given by : _ ~o --- -- F (62) F strain field ~ is to the internal stress field ~ress-free t t F .. BO{-1 _ ~o ... l) l) l) (63) This contribution is self-equilibrated «1 > = O)F From any of the equations (60), the macroscopic stress-free strain E may be calculated. We find easily : EF = «Ao ~ - rOc + seff BO lJ. 0 ) eF> - - ",. - - = «I - - _ 6s eff BO lJ.
B. , An indentation technique for measuring stresses in tempered glass surfaces, J. Am. Ceram. , 1977, 60, 86-87. 5. , Suzuki, K. , the effect of residual stress on fracture of ceramics, Proc. of 26th Symp. of Jpn Soci. Mech. Engng, 1988, 880-2, 223-227. 6. , Fujiwara, H. , Residual stress in ground layer of hot-pressed Si3N4 ceramics and its thermal stability, J. Soci. Mater. Sci. Jpn, 1988, 17, 21-215. 7. , Engineering formulae for fatigue strength reduction due to crack-lik~notches, Int. J. , 1983, 22, R39-46.
International Conference on Residual Stresses: ICRS2 by André Zaoui (auth.), G. Beck, S. Denis, A. Simon (eds.)
by George
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