Understanding the near-threshold crack growth behavior in an aluminum alloy by x-ray tomography
Understanding the near-threshold crack growth behavior in an aluminum alloy by x-ray tomography
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通过 X 射线断层扫描了解铝合金中的近阈值裂纹扩展行为
DOI：
10.1051/matecconf/201816513007
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
H.-J. Christ
中科院分区：
文献类型：
--
作者：
M. Wicke;A. Brückner-Foit;T. Kirsten;M. Zimmermann;F. Bülbül;H.-J. Christ
使用预裂纹的商业铝合金在两种热处理状态下的扁平狗骨形试样来评估长裂纹的近门槛值行为。一旦阈值是已知的，裂纹最初引入的循环压缩下传播的负载控制与近似恒定的范围内的应力强度因子的值接近的阈值。利用μ-CT重建了裂纹的三维形貌和初生相的空间分布，分析了显微组织和初生相对裂纹扩展的影响。结果表明，裂纹的扩展主要有两种机制。首先，裂纹前沿被一次析出物钉扎，导致裂纹前沿扭结。第二种机制是显着的剪切控制裂纹生长的长裂纹的丘陵结构的裂纹面。发现第一种机制在R=-1时占主导地位，而在R=0.1时进行的试验表明剪切控制裂纹扩展的倾向增加。
The near-threshold behavior of long cracks is evaluated using pre-cracked flat dogbone specimens of a commercial aluminum alloy in two heat treatment states. Once the threshold was known, the crack initially introduced by cyclic compression was propagated under load control with approximately constant range of the stress intensity factor at values close to the threshold values. The 3D morphology of the crack and the spatial distribution of the primary precipitates obtained by μ-CT were reconstructed with the aim of analyzing the role of the microstructure and primary precipitates on crack growth. Results pointed out that there were two major mechanism keeping the crack from continuous extension. First, the crack front was pinned by primary precipitates leading to kinking of the crack front. The second mechanism was pronounced shear-controlled crack growth of long cracks seen in terms of hilly structures on the crack faces. The first mechanism was found to be dominant at R=-1, whereas tests performed with R=0.1 showed an increased propensity towards shear controlled crack growth.
腐蚀沉积物对 2xxx 和 7xxx 系列铝合金近阈值疲劳裂纹扩展行为的影响
DOI：
--
发表时间：
1982
期刊：
影响因子：
--
作者：
A. Vasudévan;S. Suresh
通讯作者：
S. Suresh
影响因子：
2.7
作者：
T. Stein;M. Wicke;A. Brückner-Foit;T. Kirsten;M. Zimmermann;F. Bülbül;H.-J. Christ
通讯作者：
H.-J. Christ
时效硬化对真空中7075铝合金疲劳裂纹扩展行为的影响
DOI：
--
发表时间：
1983
期刊：
影响因子：
--
作者：
M. Lafarie;C. Gasc
通讯作者：
C. Gasc