CN101907605A - Method for detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response - Google Patents
Method for detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response Download PDFInfo
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- CN101907605A CN101907605A CN201010205308.1A CN201010205308A CN101907605A CN 101907605 A CN101907605 A CN 101907605A CN 201010205308 A CN201010205308 A CN 201010205308A CN 101907605 A CN101907605 A CN 101907605A
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Abstract
The invention relates to a method for detecting the fatigue damage degree of a self-piercing riveting joint for a metal plate through dynamic response. The method comprises the following steps: firstly, carrying out single-point excitation and multi-sampling dynamic response tests on test pieces with different stages of life fatigues for the self-piercing riveting joint by using a dynamic response detection system, and determining the natural frequency of dynamic response of the joint through test data processing and image analysis when the fatigue damage degree of the self-piercing riveting joint is increased; and secondly, judging the fatigue damage degree of the self-piercing riveting joint by detecting the variation trend of the natural frequency of dynamic response. The invention has the advantages of holding the fatigue damage degree of the self-piercing riveting joint, realizing the nondestructive testing of fatigue damage of the self-piercing riveting joint, and promoting the wide application of the self-piercing riveting technology to each industrial production field by applying the dynamic response detection method through detecting the natural frequency of dynamic response of the self-piercing riveting joint.
Description
Technical field
The present invention relates to the self-pierce riveting head technical field of nondestructive testing, particularly a kind of method by detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response.
Background technology
Self-punching riveting technology can be widely used in the connection of various difficult welded blanks in the engineering, is specially adapted to the manufacturing of light energy-saving type body of a motor car, is the green manufacture technology with broad prospect of application.Under the alternate load effect in vehicle traveling process, self-pierce riveting head can produce fatigue crack and cause losing efficacy.Therefore, the research of self-piercing riveting joint fatigue properties is subjected to the great attention of auto manufacturing.Because the fatigue crack of self-piercing riveting joint for metal plate through appears near the inner riveting point of joint usually and squeezes the wrinkle eroded area, can not observe the generation and the expansion of crackle or measure crack size with conventional method, but joint inside exists crackle can influence the natural frequency of its dynamic response, therefore can utilize the variation of dynamic response natural frequency to detect fatigue damage degree of self-piercing riveting joint for metal plate through.
Summary of the invention
The purpose of this invention is to provide a kind of method by detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response.
The used detection system of self-pierce riveting head dynamic response detection method of the present invention is made up of vibrator, acceleration transducer, load transducer, data acquisition system (DAS), data handling system, power amplifier and computer; Computer connects with data handling system, data handling system connects with power amplifier, power amplifier connects with vibrator, vibrator connects with load transducer, load transducer connects with self-pierce riveting head, self-pierce riveting head connects with acceleration transducer, and acceleration transducer and load transducer connect with data acquisition system (DAS) respectively, and data acquisition system (DAS) connects with data handling system.
Wherein, load transducer places joint total length 20% place, and keeps to the side.Acceleration transducer is affixed on place, joint upper surface measured point.
Detection method:
(1). with the high-cycle fatigue experimental facilities self-pierce riveting head is carried out the life-cycle fatigue experiment, obtain the full fatigue lifetime of self-pierce riveting head; Carry out self-pierce riveting head stage life-span fatigue experiment then under the same conditions, obtain each life-span in stage fatigue sample of self-pierce riveting head;
(2). each life-span in stage fatigue sample is carried out the dynamic response test of single point excitation, multi-point sampling with self-pierce riveting head dynamic response detection system, by test data is handled and graphical analysis, clearly joint dynamic response natural frequency variation tendency when the self-pierce riveting head fatigue damage degree increases.
(3). said method is used for various self-pierce riveting heads, can grasps the fatigue damage degree of self-pierce riveting head by detecting the dynamic response natural frequency.
Principle of work: in data handling system, convert simulating signal to by the finite bandwidth random digital signal that computer sends by modal analysis test software, amplify through power amplifier, by load transducer self-pierce riveting head is carried out single point excitation by vibrator, carry out multidraw by the one or more acceleration transducer butt junction dynamic responses that are attached on the self-pierce riveting head again.The output signal of load transducer and acceleration transducer is through the data acquisition system (DAS) amplification and be converted to voltage signal; These voltage signals are by the data handling system sampling and convert digital signal to, can carry out analyzing and processing, obtain self-pierce riveting head dynamic response natural frequency.
Advantage of the present invention is again in utilization dynamic response detection method, grasp the fatigue damage degree of self-pierce riveting head by detecting self-pierce riveting head dynamic response natural frequency, realized the fatigue damage Non-Destructive Testing of self-pierce riveting head, with the widespread use that promotes self-punching riveting technology in each commercial production field.
Description of drawings
Fig. 1 is a self-pierce riveting head dynamic response detection system structural drawing of the present invention.
Among the figure, 1-vibrator, 2-power amplifier, 3-data handling system, 4-data acquisition system (DAS), 5-computer, 6-load transducer, 7-acceleration transducer, 8-self-pierce riveting head, 9-holding frame.
Embodiment
Self-pierce riveting head dynamic response detection system of the present invention comprises vibrator, acceleration transducer, load transducer, data acquisition system (DAS), data handling system, power amplifier and computer composition; These devices that detection system is included and software all can be bought by market and obtain.Load transducer places joint total length 20% and as close as possible edge, and acceleration transducer is affixed on place, joint upper surface measured point.Each part connecting relation is: computer connects with data handling system, data handling system connects with power amplifier, power amplifier connects with vibrator, vibrator connects with load transducer, load transducer connects with self-pierce riveting head, self-pierce riveting head connects with acceleration transducer, and acceleration transducer and load transducer connect with data acquisition system (DAS) respectively, and data acquisition system (DAS) connects with data handling system.
Carrying out fatigue damage degree of self-piercing riveting joint for metal plate through according to the following steps detects:
(1). with the high-cycle fatigue experimental facilities self-pierce riveting head is carried out the life-cycle fatigue experiment, obtain the full fatigue lifetime of self-pierce riveting head; Carry out self-pierce riveting head stage life-span fatigue experiment then under the same conditions, obtain each life-span in stage fatigue sample of self-pierce riveting head.
(2). with self-pierce riveting head dynamic response detection system each life-span in stage fatigue sample is carried out single point excitation, carried out the dynamic response sampling at the surperficial point as much as possible of joint test specimen, by test data is handled and graphical analysis, determine joint dynamic response natural frequency when the self-pierce riveting head fatigue damage degree increases.
(3). said method is used for various self-pierce riveting heads, can judges the fatigue damage degree of self-pierce riveting head by detecting dynamic response natural frequency variation tendency.
Claims (4)
1. the method for a detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response is characterized in that being undertaken by following:
(1). each life-span in stage fatigue sample of self-pierce riveting head is carried out the dynamic response test of single point excitation, multi-point sampling with the dynamic response detection system, by test data is handled and graphical analysis, determine joint dynamic response natural frequency when the self-pierce riveting head fatigue damage degree increases;
(2). judge the fatigue damage degree of self-pierce riveting head by the variation tendency that detects the dynamic response natural frequency.
2. the detection system of the described detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response of claim 1 is characterized in that being made up of vibrator, acceleration transducer, load transducer, data acquisition system (DAS), data handling system, power amplifier and computer; Computer connects with data handling system, data handling system connects with power amplifier, power amplifier connects with vibrator, vibrator connects with load transducer, load transducer connects with self-pierce riveting head, self-pierce riveting head connects with acceleration transducer, and acceleration transducer and load transducer connect with data acquisition system (DAS) respectively, and data acquisition system (DAS) connects with data handling system.
3. the detection system of detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response according to claim 2 is characterized in that load transducer places joint total length 20% place, and keeps to the side.
4. the detection system of detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response according to claim 2 is characterized in that acceleration transducer is affixed on place, joint upper surface measured point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010205308.1A CN101907605A (en) | 2010-06-22 | 2010-06-22 | Method for detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010205308.1A CN101907605A (en) | 2010-06-22 | 2010-06-22 | Method for detecting fatigue damage degree of self-piercing riveting joint for metal plate through dynamic response |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590340A (en) * | 2012-02-29 | 2012-07-18 | 湖南湖大艾盛汽车技术开发有限公司 | Detection equipment for welding spot failure of whole set of white vehicle body |
| CN110057516A (en) * | 2019-03-25 | 2019-07-26 | 沙洲职业工学院 | A kind of slender rod piece elastic stiffness test device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598528A (en) * | 2004-09-06 | 2005-03-23 | 浙江大学 | Crankshaft bend fatigue test system and method |
| CN1908619A (en) * | 2006-08-08 | 2007-02-07 | 铁道第五勘察设计院 | Deformation modulus E testing instrument and method thereof |
| EP1875976A1 (en) * | 2006-07-07 | 2008-01-09 | Bayerische Motoren Werke Aktiengesellschaft | Self-piercing riveting unit |
| CN201697830U (en) * | 2010-06-22 | 2011-01-05 | 昆明理工大学 | Device for detecting fatigue damage degree of self-piercing rivet joint of metal sheet through dynamic response |
-
2010
- 2010-06-22 CN CN201010205308.1A patent/CN101907605A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598528A (en) * | 2004-09-06 | 2005-03-23 | 浙江大学 | Crankshaft bend fatigue test system and method |
| EP1875976A1 (en) * | 2006-07-07 | 2008-01-09 | Bayerische Motoren Werke Aktiengesellschaft | Self-piercing riveting unit |
| CN1908619A (en) * | 2006-08-08 | 2007-02-07 | 铁道第五勘察设计院 | Deformation modulus E testing instrument and method thereof |
| CN201697830U (en) * | 2010-06-22 | 2011-01-05 | 昆明理工大学 | Device for detecting fatigue damage degree of self-piercing rivet joint of metal sheet through dynamic response |
Non-Patent Citations (3)
| Title |
|---|
| 《中国博士学位论文全文数据库工程科技2辑》 20080815 王瑞杰 基于动态响应分析的点焊接头疲劳损伤与寿命预测 24-54 1-4 , 第8期 2 * |
| 《华东交通大学学报》 20080630 陈兴茂 等 自冲铆接疲劳强度的研究概况 106-110 1-4 第25卷, 第3期 2 * |
| 《机械工程学报》 20090430 李承山 等 变幅加载下基于动态响应特性的点焊接头疲劳寿命预测 70-75 1-4 第45卷, 第4期 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590340A (en) * | 2012-02-29 | 2012-07-18 | 湖南湖大艾盛汽车技术开发有限公司 | Detection equipment for welding spot failure of whole set of white vehicle body |
| CN102590340B (en) * | 2012-02-29 | 2014-11-05 | 湖南湖大艾盛汽车技术开发有限公司 | Detection equipment for welding spot failure of whole set of white vehicle body |
| CN110057516A (en) * | 2019-03-25 | 2019-07-26 | 沙洲职业工学院 | A kind of slender rod piece elastic stiffness test device |
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Application publication date: 20101208 |