Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision Cropping
The crack initiation of V-shaped notch tip has a very important influence on the cross-section quality and the cropping time for every segment of metal bar in course of low stress precision cropping. By the finite element method, the influence of machining precision of V-shaped notch bottom corner o...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2014/861465 |
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| _version_ | 1832554442618044416 |
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| author | Lijun Zhang Shengdun Zhao Zhenwei Wang |
| author_facet | Lijun Zhang Shengdun Zhao Zhenwei Wang |
| author_sort | Lijun Zhang |
| collection | DOAJ |
| description | The crack initiation of V-shaped notch tip has a very important influence on the cross-section quality and the cropping time for every segment of metal bar in course of low stress precision cropping. By the finite element method, the influence of machining precision of V-shaped notch bottom corner on the crack initiation location is analyzed and it is pointed out that the crack initiation point locates in the place at the maximal equivalent stress change rate on V-shaped notch surface. The judgment criterion of the crack initiation direction is presented and the corresponding crack initiation angle can be calculated by means of the displacement extrapolation method. The factual crack initiation angle of the metal bar has been measured by using the microscopic measurement system. The formula of the crack initiation life of V-shaped notch tip is built, which mainly includes the stress concentration factor of V-shaped notch, the tensile properties of metal material, and the cyclic loading conditions. The experimental results show that the obtained theoretical analyses about the crack initiation location, the crack initiation direction, and the crack initiation time in this paper are correct. It is also shown that the crack initiation time accounts for about 80% of the cropping time for every segment of the metal bar. |
| format | Article |
| id | doaj-art-a73fc23fdeac4b1fa99bb40c8ad1134b |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-a73fc23fdeac4b1fa99bb40c8ad1134b2025-02-03T05:51:34ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422014-01-01201410.1155/2014/861465861465Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision CroppingLijun Zhang0Shengdun Zhao1Zhenwei Wang2College of Electromechanical Engineering, China University of Petroleum, Qingdao 266580, ChinaSchool of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaThe crack initiation of V-shaped notch tip has a very important influence on the cross-section quality and the cropping time for every segment of metal bar in course of low stress precision cropping. By the finite element method, the influence of machining precision of V-shaped notch bottom corner on the crack initiation location is analyzed and it is pointed out that the crack initiation point locates in the place at the maximal equivalent stress change rate on V-shaped notch surface. The judgment criterion of the crack initiation direction is presented and the corresponding crack initiation angle can be calculated by means of the displacement extrapolation method. The factual crack initiation angle of the metal bar has been measured by using the microscopic measurement system. The formula of the crack initiation life of V-shaped notch tip is built, which mainly includes the stress concentration factor of V-shaped notch, the tensile properties of metal material, and the cyclic loading conditions. The experimental results show that the obtained theoretical analyses about the crack initiation location, the crack initiation direction, and the crack initiation time in this paper are correct. It is also shown that the crack initiation time accounts for about 80% of the cropping time for every segment of the metal bar.http://dx.doi.org/10.1155/2014/861465 |
| spellingShingle | Lijun Zhang Shengdun Zhao Zhenwei Wang Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision Cropping Advances in Materials Science and Engineering |
| title | Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision Cropping |
| title_full | Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision Cropping |
| title_fullStr | Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision Cropping |
| title_full_unstemmed | Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision Cropping |
| title_short | Investigation on the Crack Initiation of V-Shaped Notch Tip in Precision Cropping |
| title_sort | investigation on the crack initiation of v shaped notch tip in precision cropping |
| url | http://dx.doi.org/10.1155/2014/861465 |
| work_keys_str_mv | AT lijunzhang investigationonthecrackinitiationofvshapednotchtipinprecisioncropping AT shengdunzhao investigationonthecrackinitiationofvshapednotchtipinprecisioncropping AT zhenweiwang investigationonthecrackinitiationofvshapednotchtipinprecisioncropping |