著者

向山 和孝 花木 宏修 中村 裕紀 境田 彰芳 岡田 憲司 伊藤 勉 菅田 淳 酒井 達雄

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.67, no.2, pp.136-142, 2018-02-15 (Released:2018-02-20)

参考文献数

15

被引用文献数

3 2

---

A statistical estimation method of S-N curve for aluminum alloys using their static mechanical properties was proposed. Firstly, S-N data series for aluminum alloys were extracted from "Database on Fatigue Strength of Metallic Materials" published by the Society of Materials Science, Japan (JSMS) and semi-logarithmic curve model was applied as mathematical regression model based on the JSMS standard, "Standard Evaluation Method of Fatigue Reliability for Metallic Materials -Standard Regression Method of S-N Curves-". Secondly, correlations between each pair of regression parameters and static mechanical properties were investigated. Using these correlations, S-N curve for aluminum alloys could be predicted easily from the static mechanical properties. Moreover, using (1) the distribution of regression parameter D and (2) the distribution of fatigue strength at 107 cycles, the percent points for the predicted S-N curve was evaluated. As result, it was confirmed that over 70% of S-N data series of wrought aluminum alloys fall within the range of estimated interval between -3s and +3s, where s means a standard deviation for the parameter of D.

著者

堀川 教世 中山 英明 境田 彰芳 田中 道七

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.49, no.4, pp.426-432, 2000-04-15 (Released:2009-06-03)

参考文献数

12

被引用文献数

3 4

---

Load-controlled fatigue tests were carried out on PAN-based monofilament carbon fibers under cyclic tensile load conditions at a frequency of 10Hz. Fatigue strength data are obtained under pre-determined maximum load Pmax with three different stress ratios of R(=Pmix/Pmax)=0.1, 0.5 and 0.7. The maximum load Pmax is not an appropriate parameter to evaluate the fatigue strength behavior because the cross-sectional area of monofilament carbon fiber is not constant and varies along the longitudinal direction. This fact results in a large scatter of fatigue lives when the data are plotted on Pmax-Nf diagram. In order to evaluate the fatigue strength behavior more precisely, the fatigue strength data must be plotted on S-N diagram by using the maximum tensile stress σmax determined from the cross-sectional area of the fracture surface. It is found that S-N properties of monofilament carbon fibers clearly show the fatigue behavior, depending on the stress ratio R. It is also found that the fatigue strength of monofilament carbon fiber is governed by two parameters such as the maximum stress σmax and the stress amplitude σa, and that the combined stress parameter σmax(1-α)×σaα is useful to describe the fatigue strength behaviors of the different stress ratios.

著者

堀川 教世 中山 英明 境田 彰芳 田中 道七

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.49, no.4, pp.426-432, 2000-04-15

被引用文献数

2 4

---

Load-controlled fatigue tests were carried out on PAN-based monofilament carbon fibers under cyclic tensile load conditions at a frequency of 10Hz.Fatigue strength data are obtained under pre-determined maximum load P_max with three different stress ratios of R(=P_mix/P_max)=0.1, 0.5 and 0.7.The maximum load P_max is not an appropriate parameter to evaluate the fatigue strength behavior because the cross-sectional area of monofilament carbon fiber is not constant and varies along the longitudinal direction.This fact results in a large scatter of fatigue lives when the data are plotted on P_max-N_f diagram.In order to evaluate the evaluate the fatigue strength behavior more precisely, the fatigue strength data must be plotted on S-N diagram by using the maximum tensile stress σ_max determined from the crosssectional area of the fracture surface.It is found that S-N properties of monofilament carbon fibers clearly show the fatigue behavior, depending on the stress ratio R.It is also found that the fatigue strength of monofilament carbon fiber is governed by two parameters such as the maximum stress σ_max and the stress amplitude σ_a, and that the combined stress parameter σ_max~(1-α)×σ_a~α is useful to describe the fatigue strength behaviors of the different stress ratios.