Development of ΔK-decreasing test method of the metal film by displacement constraint along the elliptical through hole-edge
Development of ΔK-decreasing test method of the metal film by displacement constraint along the elliptical through hole-edge
复制标题
椭圆通孔边缘位移约束金属薄膜ΔK递减测试方法的研制
DOI：
10.1299/mej.16-00274
复制
发表时间：
2016
影响因子：
4.4
通讯作者：
F. Sakata
中科院分区：
文献类型：
--
作者：
K. Shimizu;Yuusuke Kato;F. Sakata
提出了一种新的金属膜DK降低试验方法。薄膜附着在底板上的椭圆孔上，在循环应力作用下，根据底板上沿孔周方向的位移约束进行疲劳。通常，在恒定应力幅值下，应力强度因子范围随着裂纹的扩展而增加，但在这种dk降低的试验方法中，由于薄膜和基板之间的厚度不同，应力强度因子范围朝着孔边减小。通过有限元分析计算了裂纹扩展对应力强度因子的影响，确定了椭圆孔的最佳纵横比。采用DK递减试验方法，对金属薄膜进行了裂纹扩展试验。结果表明，在基板应力幅值恒定的情况下，疲劳裂纹扩展速率降低，并在孔边附近停止扩展。给出了几种金属薄膜的阈值应力强度因子范围，并讨论了该测试方法的准确性。
A new DK-decreasing test method of the metal film was developed. The film was adhered to a through elliptical hole in a base plate and was fatigued in accordance with the displacement constraint along the hole -circumference in the base plate subjected to a cyclic stress. Commonly, a stress intensity factor range was increased with a crack propagation under a constant stress amplitude but was decreased toward the hole-edge because of the difference in thickness between the film and the base plate in this DK-decreasing test method. The decrease in a stress intensity factor with a crack propagation was calculated by FEM analysis and the optimum aspect ratio of an elliptical hole was determined. Using the DK-decreasing test method, the crack propagation test was conducted for metal films. As a result, the fatigue crack propagation rate was decreased and was arrested near the hole-edge under the constant stress amplitude to the base plate. The threshold stress intensity factor ranges were obtained for some kinds of metal film and the accuracy of the testing method was discussed.
DOI：
10.1299/kikaia.78.808
发表时间：
2012
期刊：
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
影响因子：
--
作者：
近藤 俊之;今岡 貴裕;平方 寛之;米津 明生;﨑原 雅之;箕島 弘二
通讯作者：
箕島 弘二