Study of Screw Drive Failure Mechanisms in a Flight Aid Carrier

doi:10.12382/bgxb.2022.0242

Abstract

Abstract:

The friction and temperature-rise mechanisms in the screw transmission of a flight aid carrier have received limited research attention, focusing primarily on structural strength rather than thermal-mechanical coupling. This study aims to address this gap by developing a thermal-mechanical coupling model to simulate the thermal and mechanical characteristics of the contact surface using accurate parameters. By analyzing stress, temperature rise, and the law between temperature and the friction coefficient, this study reveals the failure mechanism of the transmission. The numerical simulation results show that the temperature of the contact surface can quickly rise to 454.3℃, and the contact stress can reach 699.4MPa during high-speed friction. The elevated temperature weakens the material strength of the contact surface, while the high-speed sliding fiction causes continuous damage to the contact surface. The calculation results align with observed fault phenomena and provide a theoretical basis for the engineering application of this transmission technology.

Key words: carrier, screw drive, friction heat, failure, numerical simulation

DU Yonggang, WANG Xuesong, WAN Zhihua. Study of Screw Drive Failure Mechanisms in a Flight Aid Carrier[J]. Acta Armamentarii, 2023, 44(7): 2033-2040.

Figures/Tables 16

Fig.1 Composition of the deployable mechanism

Fig.2 Composition of the transmission mechanism

Fig.3 Model framework

Table 1 Parameters of the model

Fig.4 Mesh of the finite element model

Table 2 Thermo-elastic material parameters of 30CrMnSiA

温度T/℃	弹性模量 C^TH/GPa	泊松比μ	热膨胀系数 α/(10^-6·℃^-1)
20	196	0.3	10.12
200	177	0.3	11.72
300	167	0.3	12.96
400	162	0.3	13.62
500	157	0.3	13.90

Table 3 Thermo-physical parameters of 30CrMnSiA

温度 T/℃	热传导系数 h/(W·mm^-1·℃^-1)	定比热容/ (J·kg^-1·℃^-1)
20	0.02763
200	0.03056
300	0.03056	473.1
400	0.03056
500	0.02867

Table 4 Yield strengths of 30CrMnSiA at different temperatures

Fig.5 Heat conduction between contact surfaces

Fig.6 Applied load

Fig.7 Temperature and stress distribution on the contact surface

Fig.8 Speed curve of the push rod

Fig.9 Temperature curve of the contact surface

Fig.10 Relationship between friction coefficient and temperature on the contact surface

Fig.11 Ribs of the push rod

Fig.12 Energy spectrum analysis of materials at the ablation spot

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