THE INFLUENCE OF AGE‐HARDENING ON FATIGUE CRACK PROPAGATION BEHAVIOUR IN 7075 ALUMINIUM ALLOY IN VACUUM
THE INFLUENCE OF AGE‐HARDENING ON FATIGUE CRACK PROPAGATION BEHAVIOUR IN 7075 ALUMINIUM ALLOY IN VACUUM
复制标题
时效硬化对真空中7075铝合金疲劳裂纹扩展行为的影响
DOI：
--
复制
发表时间：
1983
期刊：
影响因子：
--
通讯作者：
C. Gasc
中科院分区：
文献类型：
--
作者：
M. Lafarie;C. Gasc
在真空条件下，研究了时效硬化对7075铝合金中低裂纹扩展速率的影响。在近阈值条件下，t651和t7351处理的断口形貌和裂纹扩展曲线发生了转变。裂纹闭合的测量表明其与表面粗糙度有关，并解释了ΔKth与载荷比无关，但t7351合金除外。裂纹扩展速率ΔKeff的四次方方程只与均匀变形模式下的裂纹扩展曲线吻合。
— The influence of age-hardening on the middle and low crack growth rates of a 7075 Al alloy is studied in vacuum. A transition in fracture surfaces morphology and crack growth curves is observed with the T 651 and T 7351 treatments in the near-threshold regime. Measurements of crack closure show its dependance on surfaces roughness and explain the lack of dependance of ΔKth with load ratio, except for the T 7351 alloy. An equation of crack growth rate to the fourth power of ΔKeff is in good agreement only with the crack propagation curves obtained for microstructure with an homogeneous deformation mode.