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 Wysłany: Wto 2:06, 21 Gru 2010 Temat postu: air jordan shoes cheap Strain fatigue cyclic softe |
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Strain fatigue cyclic softening mechanism of observation, confirmation and quantitative estimation
) Conclusive evidence of softening mechanism in Figure 4 and quantitative assessment (continued on page 2 lack of \ to \ q Mountain thatch 28 * Physical Testing of a Physical Volume Vo1.33No. 7 (I997) higher than the actual bending stress 5o. To verify the above analysis: the real name of bending stress bending stress below. Of 45 steel, 35CrMo steel and steel 60Si2Mn tested to determine both the real and nominal bending stress, the results are shown in the Schedule. Schedule was true and the name of three steel bending stress (MPa) No. 45 steel 35CrMo steel 60Si2Mn steel 0b202dpb02b2c2 (real) (nominal) (real) (nominal) (real) (nominal) can be seen from the Schedule, the test three types of steel,[link widoczny dla zalogowanych], the nominal bending stress than the earth is greater than its true bending stress. . , Higher than that of 32,36 and 29 respectively. This result supports the analysis made earlier, into the part of the plastic bending stage, the bending stress will be lower than the true name of the name of the determination of bending stress bending stress bending stress than the real reason is unreasonable because the former is calculated using the cause. In some states still use the plastic bending elastic energy should be the real determination of bending stress, or be too high to evaluate the bending properties. 5 Conclusion (1) Granada by a strict sexual expression can be applied to the determination of the true bending stress. (2) proposed a new method for the determination of the true bending stress,[link widoczny dla zalogowanych], that is part of the graphic method of deflection. (3) the name of metal bending stress was significantly higher than the actual bending stress. This is because the nominal bending stress measurement method applies only to elastic (Strictly speaking, for linear elastic) bending state, and in some plastic bending caused by the condition does not apply. (4) to evaluate the bending properties of the real bending stress should be determined so as to avoid unreasonable overestimate the flexural properties. References 1 [Su B �� Feilideman book, Sun liquid state,[link widoczny dla zalogowanych], such as translation. Metal mechanical properties. Beijing: Mechanical Industry Press, 1982:38 ~ 392 [Su] Rodriguez pizza with families, waiting, Song Jie, such as translation. Mechanical manual. Beijing: Mechanical Industry Press, 1982:2473 Charles [] psonandRoborrC. Juvinal [. HAND-BOOKOFSTRESSANDSTRENGTH. NewYork: TheMacmiltanCompany, 1963:1904 CernicaJN. STRENGTH0FMATERIALS. Sec-ondEdition, NewYork: HOLT, 1977:2505 Ambient Temperature. Bending deflection determined part - performance. Gold standard and quality accommodation, 1995; i0: 25 ~ 29 of the formula treatment is unreasonable. Therefore, in assessing the bending of the draft recovery date :1996-04-23 Note (1) From Figure 4, A, D curve ? = 1.75 measured at the stress difference. (2) from Figure 4, C, B curves measured at ? = 0.2 the stress difference. (3) One (1) + (2). (4) - port. 2 one ... because with the tempering temperature increases, the dislocation density decreases due to the original. 3 Conclusions (1) direct observation by TEM and cyclic strain increase with time confirm the indirect approach, testing mechanism for cyclic softening of steel are: yield point and micro-mechanical elimination of internal stress reduction. (2) the method of cyclic strain aging increases cyclic softening of steel the amount of the test for quantitative assessment of high accuracy. References MonotonicandCyclingPropertiesotEngineeringMaterials, MI. 1972.2FournetleRA,[link widoczny dla zalogowanych], GreyEAandFineME. Metal1. Trans. 1976A (5): 6993KwsnSIandFournelleRA. Meral1. Wrsns. ,[link widoczny dla zalogowanych], L980'11A (11): 14294RaskeDTandMorrowJ. ASTMSTP. 1969:4655 PrattJE. Aera. Meta1.1967; 15 (3): 3196StakerMRandHotrDL. Acta. Meta1.1972; 20 (4��: 5691LandgrafRW.Mitche [1MRandLapointeNR. Received :1996-10-03
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