@article{oai:kanazawa-u.repo.nii.ac.jp:00010032,
 author = {岸, 陽一 and 広瀬, 幸雄 and 佃, 市三 and 永井, 滋一 and 東, 健司},
 issue = {497},
 journal = {材料=Journal of the Society of Materials Science, Japan},
 month = {Feb},
 note = {Fatigue crack growth tests on an extruded Al-8 wt.% Zn-2.5 wt.% Mg-1.2 wt.% Cu-4 wt.% La alloy were carried out using CT specimens(TL orientation). Crack closure was examined by the unloading elastic compliance technique. The main results are as follows; (1)The effect of stress ratio was observed on the crack growth rate, da/dN, vs.stress intensity factor range, ΔK, diagram. A higher stress ratio gives a faster crack growth rate at same ΔK. (2)Crack closure was observed under the stress ratio=0.1, and its degree was increasing with decreasing stress intensity factor range. On the other hand, it was not at the stress ratio=0.5. (3)The effect of stress ratio on the second region of da/dN vs.ΔK diagram disappeared when the effective stress intesity factor range, ΔK_<eff> was used instead of ΔK. (4)The second region of da/dN vs.ΔK_<eff> diagram for the extruded Al-8 wt.% Zn-2.5 wt.% Mg-1.2 wt.% Cu-4 wt.% La alloy was in agreement with that for the commercial 7075T6 alloy. So, the fatigue crack growth resistance of the extruded Al-8 wt.% Zn-2.5 wt.% Mg-1.2 wt.% Cu-4 wt.% La alloy is nearly equal to that of the commercial 7075T6 alloy., 金沢大学大学院自然科学研究科},
 pages = {207--212},
 title = {耐応力腐食割れ性に優れた高力Al-Zn-Mg-Cu-La系押出合金の疲労き裂伝ぱ特性},
 volume = {44},
 year = {1995}
}