 Wysłany: Pon 19:43, 20 Gru 2010 Temat postu: air jordan shoes cheap Fatigue Properties of QStE3 |
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| 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,air jordan shoes cheap, cutting the length n of a 10mm, sample equipment Instron1343 servo fatigue testing machine, 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, 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, this nominal stress method,ugg milano, 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,ugg prezzo, 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, 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,ed hardy clothing, 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,air jordans, fatigue ductility coefficient sf a 1.08. (3) QStE380TMSEW092 Steel Crack Growth Rate da / dN: When da / dN ≥ 5 × 10ram / week, 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 相关的主题文章： ugg boots günstig Hot wire method in the cemented ugg prezzo Membrane oxygen enrichment for combusti ed hardy clothing City gas pipeline buried steel c |
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