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2Cr13 steel in 3.5% NaCl strain fatigue properties of medium


Type: such a fu + pregnant (+6,[link widoczny dla zalogowanych], 'I (2NI) 2Nc-wide ten-1i a 1 a', J ten AE / 2 (%) Figure 3 strain curve with repeated technical IW. = La.61 (2f ,/,)' 2-W, 3252 ~ 1o, (2N,) Ⅲ Figure 42Cr13 39 * Fatigue life curve which is a specific value. is that type (H) and type (7), the difference is, (D) mandarin duck is the coffee: l ((7x) = such a Ⅳ,) (】 5) AWp ~ Ade (rain i - it ~) to dovetail with the experimental units, well in view of partial safety considerations. requirements, ( ) is less than zero. that is, (D) ≤ 0. Since 0 ≤ (2 Ⅳ,) ≤ 1, in order to ensure, () ≤ 0, and a breeding ground by nature,[link widoczny dla zalogowanych], are based on life 2N, = 10, from (15 ) to determine t7 :,()=} one (1) = 0 so D = 3 for 2Cr18 stare at a steel temperature 3.5NaCI fatigue limit under continuous spray for a ~ = 362.85MPa, thus, the paper recommended strain amplitude and fatigue life of the relationship:. so-1_B27 × 10 +3 _2J2XtO-. (2 Ⅳ,[link widoczny dla zalogowanych], Ⅲ +0.9235 (2N /) a.. (1e) by (16) estimated the strain compared with the experimental results ratio, with good agreement between (see Figure 4), and equation (7) compared to the time when the lower NI = l 0., 55, and the low value of the largest song, obviously, in the life range 1 ≤ ≤ 10, the type (16) has a good practical, and when 2N / ~ 10 after. Basically, the fatigue stress range at L Mann, from (7) that the relation between the strain fatigue life should be the application type to be used to (16), type O6) to the stress strain fatigue can be used as the transitional phase of fatigue Yuan labor life expression. ■ Locust power 3x △ 'A (MPa, Figure 6 King cycle fatigue damage of a number of studies have estimated sweeping, circular plastic deformation is caused by the presence of corrosion damage of the underlying causes of fatigue, Park and plastic deformation is to describe the damage process can be an important mechanical markup, this is necessary to establish a certain amount of amplitude and plastic recycling in damage to the hungry, the relationship between changes . according to equation (5) \damage amount, then according to (17) ¨, hit: (compile production csl right (1 After the above derivation, we can see the product by the A.a constructed with the de-type injury that has clear physical meaning, it represents the plastic strain within a cycle can cause damage to 2Cr13 steel, room temperature, 3.5NaCl medium amount of damage is-_ = 1.856 × 10 call (DdeP) (19) musical form (19) estimated the damage Poetry this volume and the experimental results shown in Figure 5. From the above figure can be seen that all the estimated regression line friends are not in line with the lower limit of the experimental data dispersion, which in engineering applications has certain risks, Therefore, this article presents all the experimental data with the lower limit of dispersion curves,[link widoczny dla zalogowanych], application of the proposed works well with strain amplitude - fatigue life (, =] 135.68MPa, e, '= 0.7338) of China a 5m × 102 Ⅳ,) ix l +0.7338 (2N,, \transition fatigue curve fu; 1.627 × 10 a s +2.113 × 10 a (2 Ⅳ,) a. s. +0.73 ~ 8 (2 Ⅳ,) to 2) weight loss within the first cycle - i = 2.4538 × 10 a '(dDeP) 0' (23) 』V, must be pointed out. The above fatigue test was carried out under symmetrical cyclic loading,[link widoczny dla zalogowanych], in practice, if the load symmetry, = turn must considered by Morrow mean stress correction method D, in equation (5) (1 ') to D instead of the mouth, you can. Reference 1 turbine generator boiler manual metal materials. Shanghai educational publishing public hanging, Tg him 2N.E.DowIing, Stre ~ s-StrainAnalysisofCy-clicP1 quiet ticBendingAndTorsion, Trans.ABJ.E five gag.Mater.Tech, 1978:1. o: 15T ~ 163 .. one just. j. o a _1E BU EF [FLLl. l.

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