DP780胶接点焊试件拉伸损伤过程的声发射特征分析

王凯伟; 曾凯; 邢保英; 易金权

doi:10.13433/j.cnki.1003-8728.20200299

DP780胶接点焊试件拉伸损伤过程的声发射特征分析

doi: 10.13433/j.cnki.1003-8728.20200299

昆明理工大学机电工程学院云南省先进装备智能制造技术重点实验室, 昆明 650500

基金项目:

国家自然科学基金项目 51565022

详细信息

作者简介:
王凯伟(1996-), 硕士研究生, 研究方向为薄板连接件状态监测和故障诊断技术, 495816334@qq.com

通讯作者:
曾凯, 副教授, 硕士生导师, kmzk201109@163.com

中图分类号: TG441
计量
- 文章访问数: 100
- HTML全文浏览量: 24
- PDF下载量: 13
- 被引次数: 0
出版历程
- 收稿日期: 2020-06-21
- 刊出日期: 2021-12-05

Acoustic Emission Characteristic Analysis of Tensile Damage Process for DP780 Weld Bonding Specimens

Key Laboratory of Advanced Equipment Intelligent Manufacturing Technology of Yunnan Province, Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China

摘要

摘要: 针对1.2 mm厚的DP780高强钢板, 进行胶接点焊响应面实验。采集胶焊接头拉伸过程的声发射信号, 拟合拉伸过程撞击计数的历程图, 对信号进行小波包分解并分析归一化能量特征, 对比分析胶焊接头界面撕裂与基板撕裂失效形式声发射信号时域及频域特征, 并建立胶层失效时的累计撞击计数与焊接工艺参数之间的回归模型。结果表明: 界面撕裂与基板撕裂失效形式在屈服和断裂阶段产生声发射信号, 且两种失效形式对应阶段频率分布相似, 屈服阶段与断裂瞬间频率分别分布于31.25~281.25 kHz和31.25~125 kHz, 但界面撕裂失效在胶层断裂瞬间比基板撕裂失效产生更多组声发射信号; 胶层失效时累计撞击计数与焊接电流存在负相关性。
- 胶接点焊 /
- 声发射 /
- 拉伸试验 /
- 小波包 /
- 响应面
Abstract: The response surface experiment of weld bonding was carried out for 1.2 mm thick DP780 high-strength steel sheet. The Acoustic Emission(AE) signals of weld bonding joints were collected in the tensile process. The diagram of impact counting in the tensile process were fitted. The signals were decomposed by using the wavelet packet, and the normalized energy characteristics were analyzed. The time-domain and frequency-domain characteristics of AE signals of interfacial fracture and sheet fracture were analyzed. The regression model between the cumulative impact counting and welding parameters was established. The results show that the failure modes of interfacial fracture and sheet fracture produce AE signals at yield and fracture stages. The frequency distributions of the two failure modes are similar. The frequencies distribution of yield stage and fracture moment are 31.25-281.15 kHz and 31.25-125 kHz, respectively. However, the interfacial fracture produces more AE signals than the sheet fracture at the moment of adhesive layer fracture; there is a negative correlation between the cumulative impact counting and the welding current when the adhesive layer fails.
- weld bonding /
- AE signals /
- tensile test /
- wavelet packet /
- response surface

HTML全文

图 1 试件的尺寸及形状

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图 2 信号采集示意图

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图 3 拉伸过程撞击计数历程图

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图 4 胶层失效阶段声发射频域频域

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图 5 胶层失效瞬间声发射时域信号

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图 6 焊核屈服声发射信号频域

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图 7 基板撕裂后声发射信号频域

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图 8 焊接工艺参数与撞击计数回归模型

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表 1 因素范围及水平表

编号	因素名称	水平编码
编号	因素名称	-1	0	1
x₁	焊接电流/kA	7	8	9
x₂	焊接时间/ms	100	125	150
x₃	电极压力/MPa	0.3	0.35	0.4

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表 2 方差分析表

模型	项目及因素	平方和SS	自由度f	均方误差MS	检验值F值	P值Prob > F	显著性
累计撞击计数	模型	491 600 000	6	81 930 000	12.35	0.001 2	显著
	x₁	277 800 000	1	277 800 000	41.87	0.000 2
	x₂	25 580 000	1	25 580 000	3.85	0.085 2
	x₃	54 880 000	1	54 880 000	8.27	0.020 6
	x₁x₃	27 950 000	1	27 950 000	4.21	0.0742
	x₂²	74 960 000	1	74 960 000	11.30	0.009 9
	x₃²	37 470 000	1	37 470 000	5.65	0.044 8
	失拟项	44 620 000	8	7 437 000	1.76	0.405 9	不显著

下载: 导出CSV

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