ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2023, Vol. 44 ›› Issue (10): 227614-227614.doi: 10.7527/S1000-6893,2022.27614
• Solid Mechanics and Vehicle Conceptual Design • Previous Articles Next Articles
Yueliang CHEN1(), Shengjun WU1,2, Guixue BIAN1, Yong ZHANG1, Zhuzhu ZHANG2
Received:
2022-06-14
Revised:
2022-06-29
Accepted:
2022-07-13
Online:
2023-05-25
Published:
2022-07-22
Contact:
Yueliang CHEN
E-mail:cyl0532@sina.com
Supported by:
CLC Number:
Yueliang CHEN, Shengjun WU, Guixue BIAN, Yong ZHANG, Zhuzhu ZHANG. Calendar life design method for critical fatigue parts of fighter based on DFR method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(10): 227614-227614.
Table 1
Meaning and acquisition method of parameters in calendar life analysis model
序号 | 参数 | 含义 | 获取途径 |
---|---|---|---|
1 | 腐蚀强度指数n | 地面停放腐蚀环境及材料耐蚀性能的综合表征 | 试验测定 |
2 | 疲劳损伤放大因子K | 低空腐蚀环境对疲劳损伤的加剧程度 | 试验测定 |
3 | DFR基准应力比r0 | 战斗机的飞行载荷特征 | 分析飞机或结构重心过载谱获得 |
4 | DFR基准寿命N0 | 战斗机的疲劳寿命设计指标 | 分析飞机重心过载谱及疲劳寿命设计指标获得 |
5 | 细节疲劳额定值DFR0 | 结构的固有疲劳性能 | 试验测定 |
6 | 损伤指数m | 材料S-N曲线斜率 | 通常取4[ |
7 | 材料参数 | 地面停放环境对结构性能的影响 | 试验测定 |
8 | 年飞行强度SUS | 战斗机使用方法 | 战斗机飞行大纲或视情确定 |
9 | 低空飞行时间比例a | 战斗机使用方法 | 战斗机飞行大纲或视情确定 |
10 | 当量等幅谱峰值 | 疲劳关键部位飞行时承受的疲劳损伤 | 分析结构载荷谱获得或借鉴类似飞机的取值 |
11 | 当量等幅谱每飞行小时循环次数Nth | 疲劳关键部位飞行时承受的疲劳损伤 | 分析结构载荷谱获得或借鉴类似飞机的取值 |
Table 2
Material data and calendar life calculation results
序号 | 材料 | 状态 | DFRbase/MPa | 外翼2墙DFR0/MPa① | n、K② | YT /年 |
---|---|---|---|---|---|---|
1 | 7B04铝合金锻件[ 单孔试样孔径8 mm 螺栓孔加工至H9 Kt=2.50 | 粗糙度Ra1.6阳极氧化 | 94.84 | 94.20 | n=-0.15 K=1.1 | 10.47 |
2③ | 粗糙度Ra0.8喷丸,阳极氧化 | 118.24 | 117.44 | n=-0.15 K=1.1 | 23.70 | |
3 | 粗糙度Ra0.8喷丸,裸材 | 118.24 | 117.44 | n=-0.25 K=1.3 | 20.18 | |
4 | B95铝合金锻件[ 单孔试样孔径8 mm 螺栓孔加工至H9 Kt=2.42 | 粗糙度Ra1.6阳极氧化 | 104.18 | 100.17 | n=-0.15 K=1.1 | 13.16 |
5 | 粗糙度Ra0.8喷丸,阳极氧化 | 129.88 | 124.88 | n=-0.15 K=1.1 | 29.72 | |
6 | 粗糙度Ra0.8喷丸,裸材 | 129.88 | 124.88 | n=-0.25 K=1.3 | 24.92 | |
7 | 2024-T3铝合金[ 单孔试样孔径6 mm Kt=2.55 | 未喷丸,阳极氧化 | 107.00 | 108.40 | n=-0.15 K=1.1 | 17.63 |
8 | 喷丸,阳极氧化 | 117.70 | 119.24 | n=-0.15 K=1.1 | 25.06 | |
9 | 喷丸,裸材 | 117.70 | 119.24 | n=-0.25 K=1.3 | 21.26 |
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