ugg prezzo Fatigue Properties of QStE380TM SEW092

Fatigue Properties of QStE380TM SEW092

923 correlation coefficient r = 0.9886 a 1.08 sr fatigue ductility coefficient c fatigue ductility index one by one the correlation coefficient r = 0.9902 0.7599 Therefore, QStE380TMSEW0g2 strain fatigue properties of steel for the Aa/2-919 (2Nf)-o *. . 2. △ ?. / 2-1.08 (2Nf)-o ·. . Aa/2-912 (2e. / 2). * 0. 3.3 crack propagation rate aa / aN CT specimen with W a sample of 50, cutting the length n of a 10mm, sample equipment Instron1343 servo fatigue testing machine,[link widoczny dla zalogowanych], the waveform is sine wave, frequency 20Hz, test process to maintain the stress ratio r = 0.1. Crack length measured using a reading microscope with an accuracy of 0.01mm. Figure 4 shows three samples measured crack growth rate da / dN and stress intensity factor of the relationship between △ K range. The results show that,[link widoczny dla zalogowanych], da / dN and △ K found between the Paris formula, the da / dN-C (△ K). When da / dN ≥ 5 × 10ram / week da / dN of a 1.041 × 10 one. (AK). *. . When da / dN (5 × 10ram / week da / dN of a 3.747 × 10 one. (AK) ·. 7-7.50 Figure 4da/dN and talk of a relationship between the figure Fig.4Relationofda/dNand △ K3.4 Review of applications in engineering fatigue life prediction methods are two types: one is the conventional fatigue design curves based on N, the application of fatigue life estimation cumulative damage theory,[link widoczny dla zalogowanych], this nominal stress method, the results obtained for the total life; the other for the local Estimation of stress-strain crack initiation life, with the fracture mechanics method for solving crack propagation life, and for the total life of both. Thus the material fatigue properties of SN curves, ~-2N curves and da / dN is the basis for estimating the fatigue life. SN curve with the conventional method for estimating the stress level of the lower life expectancy,[link widoczny dla zalogowanych], longer life expectancy (eg,> 5 × 10), stable load conditions. When the stress level high, the danger point of zero occurrence of yield components, short-lived (eg, cr0.1-335MPa when, N a 6.722 × 10 stare at one percent. (2) obtained from low cycle fatigue test of a life span of the steel strain curves, including a cyclic hardening index 0.1204, cyclic strength coefficient K-912MPa, the fatigue strength index 6 a - 0.0923, 0.7599 fatigue ductility index of C one by one, the fatigue strength coefficient stare a 919MPa, fatigue ductility coefficient sf a 1.08. (3) QStE380TMSEW092 Steel Crack Growth Rate da / dN: When da / dN ≥ 5 × 10ram / week,[link widoczny dla zalogowanych], da / dN of a 2.2364 × 10 one. (AK )。·¨: when da / dN <5 × 10ram / week, da / dN = 1.54147 × 10 A (AK) · \. [2] G13/T15248--1994, pieces of metal materials such as low cycle axial fatigue testing [S]. [3] GB3075 - 82, metal axial fatigue testing [S]. [4] GWT6398 - 2000, metal fatigue crack growth rate test method rS]. one thousand one hundred and eleven of a drunken summer pop j 0 Mu

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