An improved DIC method for full-field strain measurement in tensile tests on aluminium alloys under hot stamping conditions
Digital image correlation (DIC) outperforms other strain measurement technologies due to its versatility, accuracy, non-contact nature, and capability to capture full-field strains. However, for aluminium alloys like AA6082 under high-temperature and large-deformation conditions, the shiny effects o...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2024-05-01
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| Series: | International Journal of Lightweight Materials and Manufacture |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2588840424000076 |
| _version_ | 1827263308280889344 |
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| author | Siyi Chen Ruiqiang Zhang Zhusheng Shi Jianguo Lin |
| author_facet | Siyi Chen Ruiqiang Zhang Zhusheng Shi Jianguo Lin |
| author_sort | Siyi Chen |
| collection | DOAJ |
| description | Digital image correlation (DIC) outperforms other strain measurement technologies due to its versatility, accuracy, non-contact nature, and capability to capture full-field strains. However, for aluminium alloys like AA6082 under high-temperature and large-deformation conditions, the shiny effects observed in the gauge area degrade the quality of the captured deformation images, leading to failures in the DIC analyses. In this study, the source of the shiny effects was investigated by analysing the evolution of AA6082 specimen surfaces painted with speckle patterns during hot stamping deformation. It was found that the shiny effects were attributed to the exposure of the reflective base material due to paint peeling and cracking. To overcome these problems, the DIC method was improved by developing a novel procedure for generating more effective speckle patterns and utilising a cross-polarisation optical system (XPOL) to mitigate the shiny effects. The improved DIC method was applied to AA6082 in both uniaxial and biaxial tensile tests under diverse hot stamping conditions, along with applications to boron steel for comparison. These improvements significantly reduced the shiny effects and increased the time over which full-field strains can be measured for AA6082, reaching over 96% (up from 75%) of the fracture time in the uniaxial tests and even 100% in the biaxial tests. The improved DIC method enables the full-field strain measurement for aluminium alloys under hot stamping conditions, allowing for the accurate determination of their thermomechanical properties. |
| first_indexed | 2024-04-25T00:15:34Z |
| format | Article |
| id | doaj.art-2d5522ea7af143718b235a8b15069735 |
| institution | Directory Open Access Journal |
| issn | 2588-8404 |
| language | English |
| last_indexed | 2025-03-22T03:28:06Z |
| publishDate | 2024-05-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | International Journal of Lightweight Materials and Manufacture |
| spelling | doaj.art-2d5522ea7af143718b235a8b150697352024-04-29T04:14:45ZengKeAi Communications Co., Ltd.International Journal of Lightweight Materials and Manufacture2588-84042024-05-0173438449An improved DIC method for full-field strain measurement in tensile tests on aluminium alloys under hot stamping conditionsSiyi Chen0Ruiqiang Zhang1Zhusheng Shi2Jianguo Lin3Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UKCorresponding author.; Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UKDepartment of Mechanical Engineering, Imperial College London, London SW7 2AZ, UKDepartment of Mechanical Engineering, Imperial College London, London SW7 2AZ, UKDigital image correlation (DIC) outperforms other strain measurement technologies due to its versatility, accuracy, non-contact nature, and capability to capture full-field strains. However, for aluminium alloys like AA6082 under high-temperature and large-deformation conditions, the shiny effects observed in the gauge area degrade the quality of the captured deformation images, leading to failures in the DIC analyses. In this study, the source of the shiny effects was investigated by analysing the evolution of AA6082 specimen surfaces painted with speckle patterns during hot stamping deformation. It was found that the shiny effects were attributed to the exposure of the reflective base material due to paint peeling and cracking. To overcome these problems, the DIC method was improved by developing a novel procedure for generating more effective speckle patterns and utilising a cross-polarisation optical system (XPOL) to mitigate the shiny effects. The improved DIC method was applied to AA6082 in both uniaxial and biaxial tensile tests under diverse hot stamping conditions, along with applications to boron steel for comparison. These improvements significantly reduced the shiny effects and increased the time over which full-field strains can be measured for AA6082, reaching over 96% (up from 75%) of the fracture time in the uniaxial tests and even 100% in the biaxial tests. The improved DIC method enables the full-field strain measurement for aluminium alloys under hot stamping conditions, allowing for the accurate determination of their thermomechanical properties.http://www.sciencedirect.com/science/article/pii/S2588840424000076Digital image correlation (DIC)Hot stampingAluminium alloyBoron steelSpeckle patternsCross-polarisation optical system (XPOL) |
| spellingShingle | Siyi Chen Ruiqiang Zhang Zhusheng Shi Jianguo Lin An improved DIC method for full-field strain measurement in tensile tests on aluminium alloys under hot stamping conditions International Journal of Lightweight Materials and Manufacture Digital image correlation (DIC) Hot stamping Aluminium alloy Boron steel Speckle patterns Cross-polarisation optical system (XPOL) |
| title | An improved DIC method for full-field strain measurement in tensile tests on aluminium alloys under hot stamping conditions |
| title_full | An improved DIC method for full-field strain measurement in tensile tests on aluminium alloys under hot stamping conditions |
| title_fullStr | An improved DIC method for full-field strain measurement in tensile tests on aluminium alloys under hot stamping conditions |
| title_full_unstemmed | An improved DIC method for full-field strain measurement in tensile tests on aluminium alloys under hot stamping conditions |
| title_short | An improved DIC method for full-field strain measurement in tensile tests on aluminium alloys under hot stamping conditions |
| title_sort | improved dic method for full field strain measurement in tensile tests on aluminium alloys under hot stamping conditions |
| topic | Digital image correlation (DIC) Hot stamping Aluminium alloy Boron steel Speckle patterns Cross-polarisation optical system (XPOL) |
| url | http://www.sciencedirect.com/science/article/pii/S2588840424000076 |
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