Research on damage and response of deep groove ball bearings under axial impact load
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摘要:
针对轴向冲击载荷下转子轴承的损伤和响应问题开展了研究,设计了一种试验室用模拟航空发动机轴承损伤试验台,并建立了基于plastic kinematic(PK)本构模型的轴承冲击有限元模型,研究了低、中、高这3种冲击速度下深沟球轴承的损伤和响应。结果表明:有限元仿真计算结果与试验误差在10%以内,随着冲击速度增大,轴承滚珠的损伤形式由细长的凹痕增大为区域型的凹坑,损伤产生的原因为由于变形引起的滚珠与轴承内外圈之间的挤压;不同速度的冲击过程中,最大应力总是出现在轴承滚珠上,且滚珠与轴承内外圈之间接触力及变化规律基本一致;保持架接合处和与滚珠接触的内圈位置为轴向载荷冲击下的塑性变形较大位置处。
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关键词:
- 轴向冲击载荷 /
- 深沟球轴承 /
- plastic kinematic (PK)本构模型 /
- 宏观损伤 /
- 动态响应
Abstract:The damage and response of rotor bearing under axial impact load were studied. A test bench for simulating aero-engine bearing damage in laboratory was designed, and a finite element model of bearing impact based on plastic kinematic (PK) constitutive model was established. The damage and response of deep groove ball bearing under low, medium and high impact velocities were studied. The results showed that the error between the finite element simulation results and the experimental results was within 10%. As the impact velocity increased, the damage form of the bearing ball increased from a slender dent to a regional dent. The cause of the damage was the extrusion between the ball and the inner and outer rings of the bearing caused by deformation. During the impact process at different speeds, the maximum stress always appeared on the bearing ball, and the contact force and change rule between the ball and the inner and outer rings of the bearing were basically the same. The cage joint and the inner ring in contact with the ball were located at the position where the plastic deformation was large under the impact of axial load.
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表 1 冲击试验工况
Table 1. Impact test conditions
编号 弹体质量/g 转速/(r/min) 冲击速度/(m/s) 1 75 3000 50 2 120 3 180 表 2 网格划分
Table 2. Element mesh dividing
部件 网格数量 节点数量 最低雅克比 冲击弹体 40000 42081 0.70 转轴 21984 24680 0.69 轴承座 35000 41200 0.69 滚珠 484000 496201 0.82 保持架 11880 17710 0.85 轴承内外环 70000 79200 0.87 表 3 转轴和轴承座的材料参数
Table 3. Material parameters of shaft and bearing seat
参数 数值 ρ/(kg/m3) 7850 E/GPa 200 ν 0.3 参数 数值 ρ/(kg/m3) 1093 E/GPa 450 ν 0.375 $ {\sigma }_{0} $/MPa 98 $ {{E}}_{\mathrm{t}} $/MPa 4.5 Fs 1.0 参数 数值 ρ/(kg/m3) 7180 E/GPa 212 ν 0.29 $ {\sigma }_{0} $/MPa 230 $ {{E}}_{\mathrm{t}} $/MPa 610 β 0.766 Fs 0.41 参数 数值 ρ/(kg/m3) 7930 E/GPa 194 ν 0.3 $ {\sigma }_{0} $/MPa 263.8 $ {{E}}_{\mathrm{t}} $/MPa 610 β 0.766 Fs 0.46 表 7 损伤形式及尺寸对比结果
Table 7. Comparison results of damage form and size
冲击速度/
(m/s)损伤
形式损伤尺寸/mm 误差/% 描述 试验 仿真 50 凹痕 长 1.03 0.96 6.6 120 凹痕 长 2.13 2.26 6.1 180 凹坑 长 3.04 3.24 6.6 宽 2.08 1.93 7.2 -
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