摘要
高强型铝锂合金的切口强度及其理论预测孟亮，郑修麟高强型铝锂合金板材在航空工业中具有广阔的应用前景［１］。由于用这种材料制造的飞机结构件在承受外载荷时，不可避免地存在应力集中区域（如飞机蒙皮的铆钉孔边缘处），再加上铝锂合金又具有塑韧性较低、应力集中敏感...
Al-Li alloy has been widely studied and has begun to be trial used. But we, having done research on Al-Li alloy for nearly a decade, have not yet found anything reported in the open literature on its notch strength, which is indispensible if the alloy is to be reliably used in aircraft structures containing notches.Therefore, we present our preliminary research results on supplying the notch strength information. The second author proposed in 1989 the following formula for prediCting the notch strength of metallic materials[2]:where σN is the predicted notch strength, E is the modulus of elasticity, σf is the fracture strength,εf is the fracture ductility and Kt is the theoretical stress concentration factor.We conduct tests on 2090 alloy notched specimens cut from the same sheet 2. 0 mm in thickness. There are 3 to 4 specimens each for Kt=1,2,3, 4 and 8. The test reaults are presented in logarithmic plots 1 Figs. 1 (a) and 1 (b) are for the tensile loading perpendicular and parallel to rolling direction respectively. The correlation coefficents of -0.703 and - 0. 861and significance levels of 0. 05 and 0. 01 (Table 1) are obtained respectively for the loading perpendicular and parallel to rolling direction F they show that the correlation between test data and predicted values is good and thus the use of eq. (1) looks promising for predicting the notch strength of 2090 alloy.Our test results are of course closely related to the heat treatment given to the test specimens. The specimens are solution heat treated at 540℃, water quenched, 6% stretched and aged at 165℃ for 18 h.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
1996年第2期321-322,共2页
Journal of Northwestern Polytechnical University
