Tensile and fatigue assessments of brazed stainless steel joints using digital image correlation
Tensile and fatigue assessments of brazed stainless steel joints using digital image correlation
复制标题
使用数字图像相关性对不锈钢钎焊接头进行拉伸和疲劳评估
DOI：
10.1051/matecconf/201816506003
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Walther
中科院分区：
文献类型：
--
作者：
Schmiedt;Jaquet;Tillmann;Walther
对于钎焊不锈钢接头的机械测试，钎焊焊缝小区域内的局部变形行为是主要关注的问题，因为标准机械引伸计无法检测到局部应变。目前的研究允许一个基本的理解的标距长度的影响，在准静态和循环载荷下的应变测量的钎焊接头与光滑和含缺口的表面。因此，数字图像相关（DIC）的光学测量技术中使用的拉伸和疲劳试验的钎焊AISI 304 L/BAu-4接头在接收和预腐蚀条件。DIC系统的触发图像采集成功地应用于评估在频率为10 Hz的钎焊焊缝的区域中的局部棘轮疲劳行为。在0.5至12.5 mm范围内分析的标距影响随着拉伸应力和疲劳应力的增加而更加明显，并且对于含凹口的表面显著增强。应变，电，磁和温度测量技术的仪器负载增加测试已被证明是适当的，以估计4%的偏差的钎焊接头的疲劳性能。疲劳和腐蚀疲劳损伤机制进行了评估，使用扫描电子显微镜与二次和背散射电子探测器。
For mechanical tests of brazed stainless steel joints, the local deformation behaviour within the small area of the brazing seam is a major concern, because local strains cannot be detected with standard mechanical extensometers. The current study allows a fundamental comprehension of the gauge length influence on the strain measurements of brazed joints with smooth and notch-containing surfaces, under quasi-static and cyclic loadings. Therefore, the optical measurement technique of digital image correlation (DIC) is used within tensile and fatigue tests of brazed AISI 304L/BAu-4 joints in an as-received and pre-corroded condition. A triggered image acquisition of the DIC system is successfully applied to evaluate the local ratcheting fatigue behaviour in the area of the brazing seam at a frequency of 10 Hz. The gauge length influence, analysed in the range of 0.5 to 12.5 mm, is more pronounced with increasing tensile and fatigue stresses and is significantly enhanced for notch-containing surfaces. Instrumented load increase tests with strain, electrical, magnetic and temperature measuring techniques have proven to be appropriate to estimate fatigue properties of the brazed joints with a deviation of 4%. Fatigue and corrosion fatigue damage mechanisms are evaluated by using scanning electron microscopy with secondary and back-scattered electron detectors.
影响因子：
2.5
作者：
Walther, Frank
通讯作者：
Walther, Frank
室温和25℃下低频对奥氏体钢AISI 304疲劳行为的影响
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
I. Nikitin;M. Besel
通讯作者：
M. Besel