Life Analysis of Wear Fatigue Competition Failure Mechanism of Main Bearing of Boring Machine

doi:10.16183/j.cnki.jsjtu.2023.319

Abstract

Abstract:

The main bearing of a tunneling machine is prone to premature failure under the influence of multiple factors such as wear and fatigue during service, making it difficult to predict its lifetime. In order to calculate the lifespan of the main bearing accurately, a life model is proposed that incorporates a fatigue-wear competition failure mechanism from the failure form. First, a bearing life model based on the continuous damage mechanics theory and the wear theory with surface roughness modification is proposed, and the competitive failure mechanism of bearing fatigue and wear is defined. Then, a finite element model is established by using the APDL software to simulate the contact between rollers and raceways, which helps identify the roller raceway where the bearing experiences initial failure, enabling the numerical solution of the life model. Finally, the analysis of the changes in contact stress and shear stress reveals that, during the first nine cycles, wear causes a decrease in contact stress, which suppresses fatigue failure, and extendes the bearing life. However, starting from the tenth cycle, contact stress increases, and wear accelerates the occurrence of fatigue failure. By considering the interaction of fatigue and wear, the proposed life model better reflects the actual situation.

Key words: main bearing, damage mechanics, theory of wear, finite element simulation

CLC Number:

U455.31

NA Pengyue, WU Zhen, LIU Qi, HUO Junzhou. Life Analysis of Wear Fatigue Competition Failure Mechanism of Main Bearing of Boring Machine[J]. Journal of Shanghai Jiao Tong University, 2025, 59(5): 675-683.

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参数	取值
k	1×10^-7
H/(N·mm^-2)	620
τ_R/MPa	6 113
m	10.1
弹性模量,E/MPa	2.1×10⁵
泊松比,ν	0.3

结构	滚子直径/mm	滚子长度/mm	滚子数量/个	节圆半径/mm	δ
主推滚子	120	120	104	2 134	0.1
径向滚子	50	88	220	2 268	0.07
止推滚子	70	72	156	2 198	0.075

参数	取值
轴向力/MN	12
径向力/kN	4 500
力矩/(MN·m)	20
转速/(r·min^-1)	2

参数	赫兹理论	有限元法	相对误差/%
主推接触应力/MPa	1 331	1 370.88	2.91
径向接触应力/MPa	1 170	1 186.55	1.39
止推接触应力/MPa	741.10	762.04	2.75

方法	寿命/h	变化率/%
本文寿命模型	26 287	-12.51
损伤力学模型	22 177	-26.19
文献[25]寿命模型	30 046	-