Effects of initial defects on strain measurement and elastic modulus of 3D-printed CFRP
The effects of initial defects, such as fiber breakage, on the strain measurement of 3D-printed carbon fiber-reinforced plastic (CFRP) are evaluated herein. The generation of defects is difficult to avoid during the 3D printing process of CFRP, resulting in degradation of the tensile strength. Howev...
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| Language: | English |
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The Japan Society of Mechanical Engineers
2024-11-01
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| Series: | Mechanical Engineering Journal |
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| Online Access: | https://www.jstage.jst.go.jp/article/mej/11/6/11_24-00133/_pdf/-char/en |
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| author | Keisuke IIZUKA Takumi ITO Satoru YONEYAMA |
| author_facet | Keisuke IIZUKA Takumi ITO Satoru YONEYAMA |
| author_sort | Keisuke IIZUKA |
| collection | DOAJ |
| description | The effects of initial defects, such as fiber breakage, on the strain measurement of 3D-printed carbon fiber-reinforced plastic (CFRP) are evaluated herein. The generation of defects is difficult to avoid during the 3D printing process of CFRP, resulting in degradation of the tensile strength. However, the effects of these initial defects on the elastic modulus have not been investigated. The elastic modulus is generally determined by performing strain measurements using strain gauges and extensometers, as defined by testing standards. Strain gauges and extensometers are attached to the specimen, and therefore, the measurement is affected by the specimen surface, which contains initial defects. In this study, the effects of initial defects on the strain measurement are examined by performing tensile tests, evaluating the elastic modulus, and comparing the results of the 3D-printed CFRP with those of a homogeneous material, namely aluminum. The elastic modulus is evaluated using strain gauges, extensometers, and digital image correlation (DIC). The strain in homogeneous materials is independent of the strain gauge position, but strain variation is observed in CFRP depending on the position, presumably owing to the defect distribution. Furthermore, the strain obtained from extensometers with longer gauge lengths is also affected by the initial defects. Moreover, the variation is larger for the strain obtained by DIC than that obtained using strain gauges or extensometers. The strain distribution obtained by DIC may be useful for identifying the positions where the effects of initial defects are significant. |
| format | Article |
| id | doaj-art-a533fd8d77f4403dbc9e068d4ac0c4b1 |
| institution | Kabale University |
| issn | 2187-9745 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Mechanical Engineering Journal |
| spelling | doaj-art-a533fd8d77f4403dbc9e068d4ac0c4b12024-12-18T08:34:16ZengThe Japan Society of Mechanical EngineersMechanical Engineering Journal2187-97452024-11-0111624-0013324-0013310.1299/mej.24-00133mejEffects of initial defects on strain measurement and elastic modulus of 3D-printed CFRPKeisuke IIZUKA0Takumi ITO1Satoru YONEYAMA2Department of Mechanical Engineering, Aoyama Gakuin UniversityDepartment of Mechanical Engineering, Aoyama Gakuin UniversityDepartment of Mechanical Engineering, Aoyama Gakuin UniversityThe effects of initial defects, such as fiber breakage, on the strain measurement of 3D-printed carbon fiber-reinforced plastic (CFRP) are evaluated herein. The generation of defects is difficult to avoid during the 3D printing process of CFRP, resulting in degradation of the tensile strength. However, the effects of these initial defects on the elastic modulus have not been investigated. The elastic modulus is generally determined by performing strain measurements using strain gauges and extensometers, as defined by testing standards. Strain gauges and extensometers are attached to the specimen, and therefore, the measurement is affected by the specimen surface, which contains initial defects. In this study, the effects of initial defects on the strain measurement are examined by performing tensile tests, evaluating the elastic modulus, and comparing the results of the 3D-printed CFRP with those of a homogeneous material, namely aluminum. The elastic modulus is evaluated using strain gauges, extensometers, and digital image correlation (DIC). The strain in homogeneous materials is independent of the strain gauge position, but strain variation is observed in CFRP depending on the position, presumably owing to the defect distribution. Furthermore, the strain obtained from extensometers with longer gauge lengths is also affected by the initial defects. Moreover, the variation is larger for the strain obtained by DIC than that obtained using strain gauges or extensometers. The strain distribution obtained by DIC may be useful for identifying the positions where the effects of initial defects are significant.https://www.jstage.jst.go.jp/article/mej/11/6/11_24-00133/_pdf/-char/encarbon fiber-reinforced plastics3d printingelastic modulusstrain measurement |
| spellingShingle | Keisuke IIZUKA Takumi ITO Satoru YONEYAMA Effects of initial defects on strain measurement and elastic modulus of 3D-printed CFRP Mechanical Engineering Journal carbon fiber-reinforced plastics 3d printing elastic modulus strain measurement |
| title | Effects of initial defects on strain measurement and elastic modulus of 3D-printed CFRP |
| title_full | Effects of initial defects on strain measurement and elastic modulus of 3D-printed CFRP |
| title_fullStr | Effects of initial defects on strain measurement and elastic modulus of 3D-printed CFRP |
| title_full_unstemmed | Effects of initial defects on strain measurement and elastic modulus of 3D-printed CFRP |
| title_short | Effects of initial defects on strain measurement and elastic modulus of 3D-printed CFRP |
| title_sort | effects of initial defects on strain measurement and elastic modulus of 3d printed cfrp |
| topic | carbon fiber-reinforced plastics 3d printing elastic modulus strain measurement |
| url | https://www.jstage.jst.go.jp/article/mej/11/6/11_24-00133/_pdf/-char/en |
| work_keys_str_mv | AT keisukeiizuka effectsofinitialdefectsonstrainmeasurementandelasticmodulusof3dprintedcfrp AT takumiito effectsofinitialdefectsonstrainmeasurementandelasticmodulusof3dprintedcfrp AT satoruyoneyama effectsofinitialdefectsonstrainmeasurementandelasticmodulusof3dprintedcfrp |