Strength Calculation Method of Double-Pin Track Shoes Under Tensile Load

doi:10.12382/bgxb.2021.0771

Abstract

Abstract:

Tensile load is one of the main loads on the track of armored vehicles and also an important working condition for strength calculation, but the distribution of tensile load at the connecting parts of the track is not clear. To figure out the load distribution ratio of double-pin track shoes under tensile load, single and double-shoe track tensile experiments and simulations of a certain type of armored vehicle track shoes were carried out, the difference in load distribution and stress when different numbers of track shoes were subjected to tensile load were discussed. The iterative calculation of the finite element method was used to figure out the results of stable load distribution when the track was stretched, and a two-step method to quickly calculate the stable load distribution of the track shoes was proposed. The results showed that: the tensile load distribution of the track shoes changes with the increase of the number of the track shoes; when the number of the track shoes is large enough, the load distribution of the end coupling and the guide tooth tends to have the distribution ratio of 1:2:1; the change of the number of tracks in the tensile test has some influence on the maximum stress on the track shoe and the deflection of the track pin, which should be considered in the tensile strength test of the track.

Key words: track vehicle, tensile load, load distribution, finite element method, test

ZENG Zihao, ZHANG Jingdong, GONG Xuelian, LIU Kunming, GUI Xuewen, LIAO Ridong. Strength Calculation Method of Double-Pin Track Shoes Under Tensile Load[J]. Acta Armamentarii, 2023, 44(3): 831-840.

Figures/Tables 26

Fig. 1 Common failure modes of track shoes

Fig. 2 Schematic diagram of track shoe under tensile load

Fig. 3 Tensile test diagram of single and double track shoes

Fig. 4 Track tension-strain curve at the same position of single and double tracks

Table 1 Comparison of track strain of single and double tracks at the same position

拉力/kN	单板应变/10^-6	双板应变/10^-6
100	324	308
200	566	627
300	806	927
400	1048	1220

Fig. 5 Finite element calculation model of single and double shoes

Table 2 Relationship between contact stiffness and maximum stress

接触刚度系数	单板拉伸最大应力/MPa	双拉伸最大应力/MPa
0.1	273.63	286.57
1	281.48	294.98
10	281.49	294.98
100	281.49	294.98

Fig. 6 Relationship between mesh size and maximum strain

Fig. 7 Finite Element Simulation Part Mesh Model

Table 3 Material parameters of track parts

部件	弹性模量 /GPa	屈服强度 /MPa	最大强度 /MPa
履带板	210	980	1 080
诱导齿	210	980	1 080
端联器	210	980	1 080
工装	210	980	1 080
销轴	200	875	930
橡胶衬套	8.5×10^-3

Fig. 8 Schematic diagram of comparison positions in test and simulation

Table 4 Comparison of test and simulation results

测量位置	单板拉伸试验与仿真对比			误差/%
测量位置	试验应变值/10^-4	仿真应变值/10^-4		误差/%
1	4.30	4.53		5
2	3.27	3.15		4
3	11.60	11.30		3
4	9.68	9.32		6
测量位置	双板拉伸试验与仿真对比			误差/%
测量位置	试验应变值/10^-4		仿真应变值/10^-4	误差/%
1	11.60		10.80	8
2	7.79		8.00	4
3	6.01		5.42	11
4	9.45		9.32	2
5	6.69		6.44	4

Fig. 9 Load distribution between tooling and connecting parts

Fig. 10 Tensile stress nephogram of single shoe

Fig. 11 Tensile stress nephogram of double shoes

Fig. 12 Schematic diagram of multiple track shoes under tensile load

Fig. 13 Iterative calculation model of track shoe

Fig. 14 Flow chart of finite element iterative method

Fig. 15 Load distribution variation curves during iteration

Fig. 16 Schematic diagram of multiple track shoes under tensile load

Fig. 17 Finite element calculation model of trial calculation method

Fig. 18 Relationship between displacement and total reaction force

Table 5 Load distribution ratio under different displacements

位移/mm	诱导齿反力/kN	端联器反力/kN	载荷分配比例
1.0	13.5	12.8	1.057
1.4	19.0	18.0	1.057
1.8	24.5	23.2	1.057
2.2	30.0	28.3	1.057
2.4	35.5	33.5	1.057
2.8	38.0	36.0	1.057

Fig. 19 Multi-shoe tensile stress nephogram

Fig. 20 Comparison of track pin deflection

Fig.21 Force analysis of track pin shaft

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