Design and experiment of simulated specimen for fretting fatigue of turbine attachment
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摘要:
提出了基于损伤控制参量一致的榫连接结构微动疲劳模拟件设计方法。在几何相似的基础上,保证最大相对滑移距离与临界距离内等效应力分布的一致性,确定模拟件的二维结构尺寸;在此基础上,以临界裂纹长度内应力强度因子一致为目标,优化分析确定模拟件的三维结构尺寸;开展了某型发动机涡轮榫连接结构模拟件的微动疲劳试验,试验观测到裂纹萌生于接触面边缘,裂纹初期扩展方向垂直于接触面,断裂时的裂纹长度与仿真结果相比误差小于5%,由此验证模拟件设计方法的合理性。
Abstract:A method was proposed to design the simulated specimen for fretting fatigue of turbine attachment based on the consistency of damage control parameters. Afterwards, a simulated specimen for the turbine attachment of a certain aero-engine was designed. Firstly, based on geometric similarity, two-dimensional structural dimension of the simulated specimen was determined by ensuring the consistency of the maximum relative slip distance and the equivalent stress distribution within the critical distance; and then, three-dimensional structural dimension of the simulated specimen was determined by optimization analysis with the objective of consistency of the stress intensity factor within the critical crack length. Finally, fretting fatigue test of the simulated specimen was performed. It was found that the crack was initiated at the edge of the contact surface, the direction of the crack growth was perpendicular to the contact surface and the crack length at fracture was within 5% in error with the simulation, thus verifying the rationality of the design method of the simulated specimen.
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Key words:
- turbine attachment /
- simulated specimen /
- fretting fatigue /
- crack initiation /
- crack growth
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表 1 涡轮盘及叶片材料力学性能
Table 1. Material properties of the turbine disc and blade
材料 温度/℃ 弹性模量/GPa 切变模量/GPa 泊松比 线膨胀系数/10−6 ℃−1 GH4720Li 400 201 0.36 11.94 GH4720Li 600 190 0.37 12.55 DD6 650 107.5 100 0.37 13.34 DD6 980 80.5 74.2 0.38 14.88 表 2 榫连接结构模拟件榫头部分的试验结果
Table 2. Test results for the tenon part of the simulated specimen
编号 温度/℃ 最大载荷/kN 载荷比 寿命(循环次数)/104 T1 600 12.98 0.1 8.89 T2 600 12.98 0.1 8.59 T3 600 12.98 0.1 6.80 T4 600 12.98 0.1 8.17 T5 600 12.98 0.1 11.90 T6 600 12.98 0.1 7.68 T7 600 12.98 0.1 8.16 T8 600 12.98 0.1 6.38 T9 600 12.98 0.1 14.69 表 3 榫连接结构模拟件榫槽部分的试验结果
Table 3. Test results for the groove part of the simulated specimen
编号 温度/℃ 最大载荷/kN 载荷比 寿命(循环次数)/104 C1 600 12.98 0.1 27.49 C2 600 12.98 0.1 25.72 C6 600 12.98 0.1 29.49 -
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