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首页> 外文会议>Conference on Photon Processing in Microelectronics and Photonics III; 20040126-20040129; San Jose,CA; US >LASER-MICROMACHINED DEFECT ARRAYS FOR DC POTENTIAL DROP FATIGUE STUDIES
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LASER-MICROMACHINED DEFECT ARRAYS FOR DC POTENTIAL DROP FATIGUE STUDIES

机译：激光微缺陷阵列用于直流电位下降疲劳研究

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The experimental characterization of fatigue crack initiation and growth of structural materials can be very expensive and time consuming. Fatigue specimens are typically controlled by a single dominant defect and several specimens are needed to examine the fatigue response for each loading condition of interest. Time and expense add up as millions of load cycles are sometimes required to initiate a crack, and replicate tests are necessary to characterize the inherent statistical nature of fatigue. In order to improve the efficiency of experimentation, we are developing laser-based techniques to produce fatigue test samples with arrays of defects. Controlled arrays of oval shaped micro-defects are laser-micromachined in titanium alloy (Ti-6Al-4V). Crack initiation from the individual defects in the arrays is monitored using a DC potential drop technique. Results indicate the utility of this approach in multiplying the amount of fatigue data generated per specimen-test. The new fatigue test approach is applicable to a wide range of material systems and initial defect structures.
机译：疲劳裂纹萌生和结构材料生长的实验表征可能非常昂贵且耗时。疲劳试样通常由单个主要缺陷控制，并且需要多个试样来检查每种感兴趣载荷条件下的疲劳响应。由于有时需要数百万次的载荷循环才能引发裂纹，因此要花费大量的时间和金钱，并且必须进行重复测试来表征疲劳的固有统计性质。为了提高实验效率，我们正在开发基于激光的技术来生产带有缺陷阵列的疲劳测试样品。椭圆形微缺陷的受控阵列在钛合金（Ti-6Al-4V）中进行激光微加工。使用直流电势下降技术监测阵列中各个缺陷的裂纹萌生。结果表明，该方法可有效地增加每个样本测试生成的疲劳数据量。新的疲劳测试方法适用于各种材料系统和初始缺陷结构。

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