基于应力张量分析的后副车架疲劳试验

doi:10.19562/j.chinasae.qcgc.2021.10.019

Abstract

Abstract:

In view of that the component level fatigue bench test of rear sub-frame for five links rear suspension can't be conducted due to the interference between hydraulic actuators and hard to arrange， a fatigue test method based on stress tensor analysis is proposed. According to the stress state of potential dangerous points， the key load channels are identified， and the simple and implementable block spectra loads are defined respectively for two potential dangerous points. In the test scheme devised， the principal stress directions of dangerous points remain basically unchanged， their damage is close to that with original road spectra， and the conclusion of the test is consistent with that of suspension system test， with the cost of test and development risk reduced.

Key words: rear sub?frame, stress tensor, fatigue, block spectrum, bench test

Wenzheng Cheng,Xiaoqiao Yu,Xia Xiao,Yuanming Dong,Jie Hou. The Fatigue Test of Rear Sub⁃frame Based on Stress Tensor Analysis[J].Automotive Engineering, 2021, 43(10): 1555-1564.

Figures/Tables 35

References 13

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载荷通道名称	通道编号
前下控制臂-左	Ch1
前下控制臂-右	Ch2
前上控制臂-左	Ch3
前上控制臂-右	Ch4
后下控制臂-左	Ch5
后下控制臂-右	Ch6
后上控制臂-左	Ch7
后上控制臂-右	Ch8
前束控制臂-左	Ch9
前束控制臂-右	Ch10

位置	指标	原始路谱	连杆载荷
危险点1	损伤	0.627	0.610
危险点1	角度/（°）	33.5	33.0
危险点2	损伤	0.402	0.302
危险点2	角度/（°）	6.0	6.1

通道名称	S₁₁/MPa	S₂₂/MPa	S₁₂/MPa
Ch1	-6.07E?03	-2.71E?03	3.60E?03
Ch2	4.39E?04	-5.37E?04	1.50E?05
Ch3	2.14E?03	1.85E?03	-1.62E?03
Ch4	1.28E?03	2.76E?04	-6.46E?04
Ch5	1.83E?04	3.01E?04	-1.74E?04
Ch6	2.19E?03	5.59E?04	-1.15E?03
Ch7	-8.27E?04	-1.52E?04	4.09E?04
Ch8	-1.01E?04	-1.29E?04	9.55E?05
Ch9	-4.66E?04	2.23E?04	1.18E?04
Ch10	8.66E?04	7.04E?05	-3.99E?04

通道名称	最小主应力	最大主应力	应力范围
危险点1	-198	199	397
危险点2	-136	174	310

序号	时刻/ s	Ch1	Ch2	Ch3	Ch4	Ch5	Ch6	Ch7	Ch8	Ch9	Ch10
1	1.784	56.22%	-4.03%	12.92%	8.32%	1.30%	18.44%	5.87%	0.89%	-0.01%	0.05%
2	3.042	53.96%	-5.08%	9.73%	3.69%	0.58%	35.36%	1.83%	0.79%	0.65%	-1.48%
3	8.332	78.13%	-2.70%	9.53%	4.72%	2.62%	1.82%	6.79%	0.06%	0.57%	-1.51%
4	8.744	69.20%	-3.72%	10.66%	4.59%	2.04%	11.74%	6.37%	0.29%	0.11%	-1.26%
5	8.874	64.29%	-4.83%	8.24%	5.41%	1.93%	20.30%	4.45%	0.54%	0.75%	-1.09%
6	9.026	59.50%	-5.32%	8.91%	5.95%	1.70%	24.36%	4.57%	0.66%	0.70%	-0.97%
7	3.526	61.34%	-4.41%	7.97%	5.42%	2.23%	17.05%	8.58%	0.91%	-0.90%	1.87%
8	9.318	61.32%	-3.02%	8.88%	2.80%	1.77%	18.94%	6.97%	0.79%	-0.35%	1.94%

The Fatigue Test of Rear Sub⁃frame Based on Stress Tensor Analysis

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Figures/Tables 35

References 13

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序号	时刻/ s	Ch1	Ch2	Ch3	Ch4	Ch5	Ch6	Ch7	Ch8	Ch9	Ch10
1	1.784	48.16%	9.49%	21.45%	3.44%	4.08%	9.05%	2.07%	2.19%	0.00%	0.01%
2	3.042	47.80%	12.35%	16.71%	1.57%	1.89%	17.93%	0.67%	2.01%	-0.63%	-0.25%
3	8.332	65.58%	6.22%	15.51%	1.92%	8.12%	0.88%	2.34%	0.15%	-0.52%	-0.24%
4	8.744	57.84%	8.53%	17.27%	1.86%	6.30%	5.62%	2.20%	0.70%	-0.09%	-0.19%
5	8.874	54.79%	11.30%	13.61%	2.22%	6.07%	9.93%	1.57%	1.32%	-0.69%	-0.16%
6	9.026	50.69%	12.45%	14.72%	2.45%	5.35%	11.87%	1.60%	1.62%	-0.64%	-0.15%
7	3.526	52.46%	10.37%	13.21%	2.23%	7.02%	8.35%	3.02%	2.23%	0.83%	0.29%
8	9.318	55.09%	7.44%	15.46%	1.21%	5.84%	9.73%	2.57%	2.04%	0.34%	0.31%

序号	时刻/ s	Ch1	Ch2	Ch3	Ch4	Ch5	Ch6	Ch7	Ch8	Ch9	Ch10
1	1.784	53.66%	0.22%	15.70%	6.77%	1.98%	15.61%	4.67%	1.36%	0.00%	0.03%
2	3.042	51.87%	0.28%	11.92%	3.01%	0.89%	30.14%	1.47%	1.22%	0.27%	-1.11%
3	8.332	74.35%	0.14%	11.55%	3.81%	4.00%	1.54%	5.38%	0.09%	0.24%	-1.11%
4	8.744	65.68%	0.21%	12.89%	3.71%	3.10%	9.87%	5.04%	0.43%	0.05%	-0.93%
5	8.874	61.30%	0.27%	10.00%	4.39%	2.95%	17.19%	3.53%	0.82%	0.31%	-0.81%
6	9.026	56.71%	0.30%	10.82%	4.82%	2.60%	20.57%	3.63%	1.01%	0.28%	-0.72%
7	3.526	58.59%	0.24%	9.69%	4.41%	3.41%	14.44%	6.82%	1.39%	-0.37%	1.39%
8	9.318	59.42%	0.17%	10.96%	2.31%	2.75%	16.25%	5.63%	1.23%	-0.15%	1.46%

序号	时刻/s	原始路谱主应力角度/（°）	通道简化后主应力角度/（°）	角度变化/（°）
1	1.784	34.5	33.1	-1.4
2	3.042	34.0	31.8	-2.2
3	8.332	34.7	41.0	6.3
4	8.744	34.6	33.2	-1.5
5	8.874	34.7	32.4	-2.3
6	9.026	34.7	32.2	-2.4
7	3.526	34.5	32.5	-2.0
8	9.318	34.3	32.5	-1.7

序号	时刻/s	原始路谱主应力角度/（°）	通道简化后主应力角度/（°）	角度变化/（°）
9	1.784	7.5	6.1	-1.4
10	2.870	5.1	5.3	0.2
11	8.074	6.3	6.2	-0.1
12	8.874	7.4	6.5	-0.9
13	9.026	6.9	6.1	-0.8
14	9.104	7.4	6.2	-1.2
15	3.508	10.4	8.5	-1.9
16	9.316	8.9	7.5	-1.4
17	9.770	8.1	6.9	-1.2

序号	时刻/s	Ch1/N	Ch3/N	Ch6/N
1	1.784	12 870	-8 374	-11 710
2	3.042	9 240	-4 719	-16 790
3	8.332	13 160	-4 548	-852
4	8.744	11 370	-4 961	-5 345
5	8.874	11 380	-4 130	-9 979
6	9.026	11 110	-4 714	-12 600
7	3.526	-10 080	3 710	7 765
8	9.318	-14 250	5 843	12 180

序号	时刻/s	Ch1/N	Ch3/N	Ch6/N	应力范围/MPa	应力百分比/%
1	1.784	25 740	16 748	23 420	396.21	99.80
2	3.042	18 480	9 438	33 580	294.42	74.16
3	8.332	26 320	9 096	1 704	291.28	73.37
4	8.744	22 740	9 922	10 690	286.00	72.04
5	8.874	22 760	8 260	19 958	306.60	77.23
6	9.026	22 220	9 428	25 200	323.59	81.51
7	3.526	20 160	7 420	15 530	284.41	71.64
8	9.318	28 500	11 686	24 360	397.00	100.00

序号	时刻/s	Ch1/N	Ch2/N	Ch4/N	应力范围/MPa	应力百分比/%
1	1.784	25 740	25 540	18 060	347.22	112.00
2	2.870	15 396	24 380	6 048	288.58	93.09
3	8.074	29 220	16 340	9 880	264.62	85.36
4	8.874	22 760	23 640	9 080	286.52	92.43
5	9.026	22 220	27 480	10 528	319.24	102.98
6	9.104	19 774	22 360	7 526	259.54	83.72
7	3.508	19 508	21 380	9 098	203.00	65.48
8	9.316	28 520	19 406	6 202	261.98	84.51
9	9.770	17 008	14 266	5 560	183.98	59.35

序号	时刻/s	筛选结论
1	1.784	应力范围偏大
2	2.870	Ch2载荷偏大
3	8.074	Ch1载荷偏大
4	8.874	CAE验证
5	9.026	应力范围偏大
6	9.104	应力范围偏小
7	3.508	应力范围偏小
8	9.316	Ch1载荷偏大
9	9.770	应力范围偏小

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