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首页> 外文会议>European Conference on Fracture >Multiscale study of morphology of the fracture surface aluminum-magnesium alloy with consecutive dynamic and gigacycle loading
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Multiscale study of morphology of the fracture surface aluminum-magnesium alloy with consecutive dynamic and gigacycle loading

机译：连续动态和缩放装载的裂缝表面铝 - 镁合金形态的多尺度研究

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摘要

In this paper we investigated the influence of consecutive dynamic and gigacycle fatigue loads on the lifetime of aluminum-magnesium alloy AlMg6. Preloading of samples was achieved during dynamic tensile tests in the split-Hopkinson bar device and quasi-static loadings were carried out on a servo hydraulic tensile machine (Biss Bi-00-100 series). Fatigue tests were conducted on Shimadzu USF-2000 ultrasonic fatigue testing machine. This machine provides 10~9-10~(10) loading cycles with the amplitude from 1 to several dozens of microns and frequency of 20 kHz, which reduces dramatically the testing time in the comparison to the classical fatigue testing machines. The New-View 5010 interferometer-profiler of high structural resolution (resolution of 0.1 nm) was used for qualitative fracture surface analysis, which provided the data allowing us to find correlation between mechanical properties and scale-invariant characteristics of damage induced roughness formed under dynamic and gigacycle fatigue loading conditions. Original form of the kinetic equation was proposed, which links the rate of the fatigue crack growth and the stress intensity factor using the scale invariant parameters of fracture surface roughness. The scale invariance characterizes the correlated behavior of multiscale damage provides the link of crack growth kinetics and the power exponent of the modified Paris law.
机译：在本文中，我们研究了连续动态和缩放疲劳载荷对铝 - 镁合金Almg6寿命的影响。在伺服液压拉伸机（BISS BI-00-100系列）上进行了在分流霍普金森棒装置中的动态拉伸试验期间实现了样品的预加载，并在伺服液压拉伸机（BISS BI-00-100系列）上进行了准静态载荷。在Shimadzu USF-2000超声波疲劳试验机上进行了疲劳试验。该机器提供10〜9-10〜（10）装载周期，幅度为1至数十个微米和20 kHz的频率，从而大大减少了与经典疲劳试验机相比的测试时间。新的view 5010干涉仪 - 探讨的高结构分辨率（分辨率为0.1nm）用于定性骨折表面分析，这提供了数据，其允许我们在动态下形成的损伤诱导粗糙度的机械性能和规模不变特性之间找到相关性的数据和缩放疲劳负载条件。提出了动力学方程的原始形式，这将疲劳裂纹生长和使用裂缝表面粗糙度的规模不变参数联系起来的疲劳裂纹生长和应力强度因子。尺度不变性表征了多尺度损伤的相关行为提供了裂纹增长动力学的链路和改进的巴黎法律的电力指数。

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