Determination of fracture mechanics parameters by digital image correlation method of surface crack for 7075 Al alloy under nonproportional cyclic loading (Growth life prediction method considering shear stress on the crack surface)
A method for predicting the propagation life of a crack initiated on the surface of a 7075 aluminum alloy under nonproportional loading was proposed using the modified Paris law. The nonproportional loading conditions in previous studies are limited to derive an experimental formula that can estimat...
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2024-11-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/90/939/90_24-00162/_pdf/-char/en |
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| _version_ | 1850158830642528256 |
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| author | Yuichi ONO Kaito WATANABE Nao KANEKO |
| author_facet | Yuichi ONO Kaito WATANABE Nao KANEKO |
| author_sort | Yuichi ONO |
| collection | DOAJ |
| description | A method for predicting the propagation life of a crack initiated on the surface of a 7075 aluminum alloy under nonproportional loading was proposed using the modified Paris law. The nonproportional loading conditions in previous studies are limited to derive an experimental formula that can estimate the effective resultant stress intensity factor range used in the modified Paris law. Therefore, crack growth tests were first conducted under new nonproportional loading conditions and the effective resultant stress intensity factor range was determined using the continuous crack opening displacement measured by digital image correlation method. Then, the contribution of the shear stress acting on the crack plane to the effective resultant stress intensity factor range was clarified by referring to well-known Findley's model, which takes into account the interlocking effect due to the shear stress acting on the crack plane. In addition, a new experimental formula that can determine the effective resultant stress range from nonproportional loading conditions without measuring the crack opening displacement was proposed. This formula enables us to predict the crack growth life until the surface crack penetrates the plate with an error of approximately ±30% based on a modified Paris-type equation through numerical integration. |
| format | Article |
| id | doaj-art-32c369bead4d4aea8ca83a137c0ce176 |
| institution | OA Journals |
| issn | 2187-9761 |
| language | Japanese |
| publishDate | 2024-11-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj-art-32c369bead4d4aea8ca83a137c0ce1762025-08-20T02:23:45ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612024-11-019093924-0016224-0016210.1299/transjsme.24-00162transjsmeDetermination of fracture mechanics parameters by digital image correlation method of surface crack for 7075 Al alloy under nonproportional cyclic loading (Growth life prediction method considering shear stress on the crack surface)Yuichi ONO0Kaito WATANABE1Nao KANEKO2Department of Mechanical and Physical Engineering, Tottori UniversityGraduate School of Sustainability Science, Tottori UniversityMitsubishi Electric Engineering Co., Ltd.A method for predicting the propagation life of a crack initiated on the surface of a 7075 aluminum alloy under nonproportional loading was proposed using the modified Paris law. The nonproportional loading conditions in previous studies are limited to derive an experimental formula that can estimate the effective resultant stress intensity factor range used in the modified Paris law. Therefore, crack growth tests were first conducted under new nonproportional loading conditions and the effective resultant stress intensity factor range was determined using the continuous crack opening displacement measured by digital image correlation method. Then, the contribution of the shear stress acting on the crack plane to the effective resultant stress intensity factor range was clarified by referring to well-known Findley's model, which takes into account the interlocking effect due to the shear stress acting on the crack plane. In addition, a new experimental formula that can determine the effective resultant stress range from nonproportional loading conditions without measuring the crack opening displacement was proposed. This formula enables us to predict the crack growth life until the surface crack penetrates the plate with an error of approximately ±30% based on a modified Paris-type equation through numerical integration.https://www.jstage.jst.go.jp/article/transjsme/90/939/90_24-00162/_pdf/-char/endigital image correlationfatiguestress intensity factorcrack closurecrack propagation |
| spellingShingle | Yuichi ONO Kaito WATANABE Nao KANEKO Determination of fracture mechanics parameters by digital image correlation method of surface crack for 7075 Al alloy under nonproportional cyclic loading (Growth life prediction method considering shear stress on the crack surface) Nihon Kikai Gakkai ronbunshu digital image correlation fatigue stress intensity factor crack closure crack propagation |
| title | Determination of fracture mechanics parameters by digital image correlation method of surface crack for 7075 Al alloy under nonproportional cyclic loading (Growth life prediction method considering shear stress on the crack surface) |
| title_full | Determination of fracture mechanics parameters by digital image correlation method of surface crack for 7075 Al alloy under nonproportional cyclic loading (Growth life prediction method considering shear stress on the crack surface) |
| title_fullStr | Determination of fracture mechanics parameters by digital image correlation method of surface crack for 7075 Al alloy under nonproportional cyclic loading (Growth life prediction method considering shear stress on the crack surface) |
| title_full_unstemmed | Determination of fracture mechanics parameters by digital image correlation method of surface crack for 7075 Al alloy under nonproportional cyclic loading (Growth life prediction method considering shear stress on the crack surface) |
| title_short | Determination of fracture mechanics parameters by digital image correlation method of surface crack for 7075 Al alloy under nonproportional cyclic loading (Growth life prediction method considering shear stress on the crack surface) |
| title_sort | determination of fracture mechanics parameters by digital image correlation method of surface crack for 7075 al alloy under nonproportional cyclic loading growth life prediction method considering shear stress on the crack surface |
| topic | digital image correlation fatigue stress intensity factor crack closure crack propagation |
| url | https://www.jstage.jst.go.jp/article/transjsme/90/939/90_24-00162/_pdf/-char/en |
| work_keys_str_mv | AT yuichiono determinationoffracturemechanicsparametersbydigitalimagecorrelationmethodofsurfacecrackfor7075alalloyundernonproportionalcyclicloadinggrowthlifepredictionmethodconsideringshearstressonthecracksurface AT kaitowatanabe determinationoffracturemechanicsparametersbydigitalimagecorrelationmethodofsurfacecrackfor7075alalloyundernonproportionalcyclicloadinggrowthlifepredictionmethodconsideringshearstressonthecracksurface AT naokaneko determinationoffracturemechanicsparametersbydigitalimagecorrelationmethodofsurfacecrackfor7075alalloyundernonproportionalcyclicloadinggrowthlifepredictionmethodconsideringshearstressonthecracksurface |