DP980与DP780双相钢帽型梁轴向冲击实验对比

韩阳; 田泽; 雷建平; 李志强

doi:10.11858/gywlxb.20190717

DP980与DP780双相钢帽型梁轴向冲击实验对比

doi: 10.11858/gywlxb.20190717

韩阳^{1, 2,},
田泽^{1, 2},
雷建平¹,
李志强^{1, 2, 3,*, ,}

1.
太原理工大学机械与运载工程学院应用力学研究所，山西太原　030024
2.
材料强度与结构冲击山西省重点实验室，山西太原　030024
3.
力学国家级实验教学示范中心（太原理工大学），山西太原　030024

基金项目: 国家自然科学基金（11672199）

详细信息

作者简介:
韩　阳（1994－），男，硕士研究生，主要从事冲击动力学研究. E-mail: hanyang0982@link.tyut.edu.cn

通讯作者:
李志强（1973－），男，博士，教授，主要从事冲击动力学和计算力学研究. E-mail: lizhiqiang@tyut.edu.cn

中图分类号: O347.1
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出版历程
- 收稿日期: 2019-01-21
- 修回日期: 2019-03-08

Comparisons between DP780 and DP980 Duplex Steel Beams with Hat-Section under Axial Impact

HAN Yang^{1, 2
,},
TIAN Ze^{1, 2},
LEI Jianping¹,
LI Zhiqiang^{1, 2, 3,*
, ,}

1.
Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2.
Shanxi Key Laboratory of Material Strength & Structural Impact, Taiyuan 030024, China
3.
National Demonstration Center for Experimental Mechanics Education (Taiyuan University of Technology), Taiyuan 030024, China

摘要

摘要: 作为汽车及航空工业中主要承载和碰撞吸能部件，帽型薄壁梁可通过自身结构塑性变形实现被动吸能。因此，研究帽型薄壁梁结构在冲击载荷作用下的变形模式和吸能特性对其被动安全设计具有重要的意义。分别对DP980和DP780双相钢帽型薄壁梁结构开展了落锤轴向冲击实验，并对其变形位移、峰值载荷、变形模态和能量吸收能力进行分析。研究结果表明：无论是DP980还是DP780帽型梁试件，在受到冲击载荷作用时，均从试件上部发生塑性屈曲变形并形成褶皱，其下部则无明显变形；DP980帽型梁冲击变形更小，残余高度更高，宜作为抗冲击变形防护结构；DP780帽型梁最终屈曲变形产生褶皱更多，冲击载荷作用时间增加，峰值载荷更低，宜作为抗冲击载荷防护结构。综合考虑吸能效果，DP980帽型梁的能量吸收能力与DP780帽型梁相近，研究结果为冲击防护结构的选材提供依据。
- 帽型梁 /
- 双相钢 /
- 轴向冲击 /
- 变形模态 /
- 吸能能力
Abstract: As the main energy absorbing component of bearing and collision in the automobile and aviation industry, the hat-section beam structure absorbs energy through plastic deformation of its own structure, which is the main criteria for previous safety design. Therefore, it is of great significance to study the deformation characteristics and energy absorption characteristics of the hat-section and thin-walled beam structure under impact load. In this paper, the axial dropping impact tests of DP780 and DP980 duplex steel with hat-section thin-walled beam structures are carried out with a dropping hammer designed by ourselves, and the maximum displacement, peak load, deformation modes and energy absorption are obtained. The results show that the plastic buckling of the upper part of the specimen is formed and the deformation of the lower part is unobvious for DP980 and DP780 hat-section beams under impact loads. The DP980 hat-section beam has less impact deformation and higher residual height, which can be used as the protection structure of anti-impact deformation. The DP780 hat-section beam has more wrinkles produced by final buckling deformation, and its impact time increases and the peak load is much lower, which can be used as the protection structure of anti-impact load. The energy absorption capacity of the DP980 hat-section beam is similar to that of the DP780 hat-section beam. The results provide the basis for the selection of anti-impact performance with thin-walled structure.
- hat-section beam /
- duplex steel /
- axial impact /
- deformation modes /
- energy absorption capacity

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图 1 实验试样

Figure 1. The experimental specimens

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图 2 帽型梁截面

Figure 2. Section of hat-section beam specimen

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图 3 实验试件装配图

Figure 3. Assembly of test specimens

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图 4 实验装置示意图

Figure 4. Schematic of experimental device

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图 5 试件A5轴向冲击实验结果

Figure 5. Experimental results of specimen A5 under axial impact

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图 6 试件A5的载荷-时间曲线

Figure 6. Loading curve of specimen A5

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图 7 试件B2轴向冲击实验结果

Figure 7. Experimental results of specimen B2 under axial impact

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图 8 试件B2的载荷-时间曲线

Figure 8. Loading curve of specimen B2

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图 9 塑性铰

Figure 9. Plastic-hinge

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图 10 A组试件位移-时间曲线

Figure 10. Displacement-time curve of group A specimens

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图 11 B组试件位移-时间曲线

Figure 11. Displacement-time curve of group B specimens

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表 1 实验变形参数

Table 1. Deformation parameters from experiments

Specimen	h/mm	t/ms	Specimen	h/mm	t/ms
A1	200	48.2	B1	147	58.7
A2	198	48.6	B2	150	59.7
A3	198	48.8	B3	150	59.2
A4	198	48.4	B4	151	59.6
A5	193	49.3	B5	140	63.6
A6	192	49.9	B6	151	60.1

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表 2 试件冲击实验结果

Table 2. Impact test results of the specimens

Specimen	E_A/kJ	F_max/kN	F_avg/kN	η	Specimen	E_A/kJ	F_max/kN	F_avg/kN	η
A1	16.9	327.64	84.50	0.2579	B1	17.5	269.27	69.16	0.2568
A3	17.1	315.52	84.65	0.2682	B2	17.6	268.58	70.40	0.2560
A4	17.1	301.67	84.75	0.2809	B4	17.7	271.19	71.08	0.2621
A5	17.2	312.59	83.09	0.2658	B5	17.6	273.48	67.69	0.2475
A6	17.3	306.69	83.17	0.2711	B6	17.2	260.60	69.07	0.2650

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