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首页> 外文会议>Materials science amp; technology 2011 conference amp; exhibition >Very High Cycle Fatigue (VHCF) Behavior of Notched Ultrasonic Fatigue Samples from Precipitation-Hardened Aluminum Alloys and Welded Joints
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Very High Cycle Fatigue (VHCF) Behavior of Notched Ultrasonic Fatigue Samples from Precipitation-Hardened Aluminum Alloys and Welded Joints

机译：沉淀强化铝合金和焊接接头的缺口超声疲劳样品的极高循环疲劳（VHCF）行为

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Fatigue behavior in the VHCF regime is dominated by microstructurally induced stress raisersrninitiated by local heterogeneities and due to the inherent nature of VHCF, the effective damagernmechanism need not be inferred readily from LCF and HCF behavior of materials. Hence, therninfluence of microscopic and macroscopic notch effects on the VHCF behavior was analyzedrnsystematically for a precipitation-hardened Al-alloy in different heat-treatment conditions,rnrepresenting the different zones of a welded joint. In addition, welded joints with trimmed surfacesrnwere tested by means of the ultrasonic fatigue testing technique, where the sinusoidalrndistribution of the load amplitude along the longitudinal load axis permits a selective testing ofrnthe different weld zones. Results for the notched samples and welded samples representing thernheat-affected zone (HAZ) indicated a clear microstructural influence while welding defects in thernweld seam led to a drastic decline of fatigue life and a pronounced scattering of the results.
机译：VHCF方案中的疲劳行为受局部异质性引发的微观结构引起的应力升高的支配，并且由于VHCF的固有性质，有效的损伤机理无需从材料的LCF和HCF行为中轻易推断出来。因此，系统地分析了在不同热处理条件下沉淀硬化铝合金的微观和宏观缺口效应对VHCF性能的影响，代表了焊接接头的不同区域。另外，通过超声疲劳测试技术对具有修整表面的焊接接头进行了测试，其中沿垂直负载轴的负载振幅的正弦分布允许对不同的焊接区域进行选择性测试。带缺口的样品和代表热影响区（HAZ）的焊接样品的结果表明存在明显的微观结构影响，而熔接缝中的焊接缺陷导致疲劳寿命急剧下降，结果明显分散。

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