Characterization and prediction of hygrothermally aged CFRP adhesive joint subjected to mode II load
Carbon fiber composite adhesives joints provide higher specific strength and fatigue life than traditional joints. However, carbon fiber composites and adhesives are polymeric materials that may lose their integrity in hygrothermal environment. Predicting the environmental degradation behavior of co...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Composites Part C: Open Access |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666682023000130 |
| _version_ | 1797803887673999360 |
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| author | Mohd. Tauheed Naresh V. Datla |
| author_facet | Mohd. Tauheed Naresh V. Datla |
| author_sort | Mohd. Tauheed |
| collection | DOAJ |
| description | Carbon fiber composite adhesives joints provide higher specific strength and fatigue life than traditional joints. However, carbon fiber composites and adhesives are polymeric materials that may lose their integrity in hygrothermal environment. Predicting the environmental degradation behavior of composite joints is challenging because of limited understanding of the complex failure behavior. Moreover, the experiments are time-consuming and therefore it is essential to use accelerated aging methods such as the open faced method. However, the challenge is how to incorporate the accelerated fracture test data into the fracture prediction of real joints. To address this, a methodology is presented for predicting mode II cohesive law parameters of degraded CFRP epoxy adhesive joints using a direct method, and an accelerated aging test. End notched flexure (ENF) specimens made with CFRP laminate and epoxy adhesive were used to study the mode II fracture. Accelerated and uniform aging was achieved using open-faced specimens aged at 40 °C and 82% relative humidity (RH). Fracture testing of aged open-faced specimens along with crack-tip images were used to determine the degradation in trapezoidal traction-separation law (TSL) with aging. These variations in trapezoidal TSL with aging were used to develop a 3D finite element (FE) model of a closed ENF specimen that captures the non-uniform degradation across the specimen width. The TSL parameters degraded significantly at the specimen edges compared to width center for the closed ENF specimens. Validation of the FE model with aged closed ENF joint showed good agreement. |
| first_indexed | 2024-03-13T05:27:47Z |
| format | Article |
| id | doaj.art-cb1759a6161a466a89158291b0c20502 |
| institution | Directory Open Access Journal |
| issn | 2666-6820 |
| language | English |
| last_indexed | 2024-03-13T05:27:47Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Composites Part C: Open Access |
| spelling | doaj.art-cb1759a6161a466a89158291b0c205022023-06-15T04:57:16ZengElsevierComposites Part C: Open Access2666-68202023-07-0111100357Characterization and prediction of hygrothermally aged CFRP adhesive joint subjected to mode II loadMohd. Tauheed0Naresh V. Datla1Department of Mechanical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, IndiaCorresponding author.; Department of Mechanical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, IndiaCarbon fiber composite adhesives joints provide higher specific strength and fatigue life than traditional joints. However, carbon fiber composites and adhesives are polymeric materials that may lose their integrity in hygrothermal environment. Predicting the environmental degradation behavior of composite joints is challenging because of limited understanding of the complex failure behavior. Moreover, the experiments are time-consuming and therefore it is essential to use accelerated aging methods such as the open faced method. However, the challenge is how to incorporate the accelerated fracture test data into the fracture prediction of real joints. To address this, a methodology is presented for predicting mode II cohesive law parameters of degraded CFRP epoxy adhesive joints using a direct method, and an accelerated aging test. End notched flexure (ENF) specimens made with CFRP laminate and epoxy adhesive were used to study the mode II fracture. Accelerated and uniform aging was achieved using open-faced specimens aged at 40 °C and 82% relative humidity (RH). Fracture testing of aged open-faced specimens along with crack-tip images were used to determine the degradation in trapezoidal traction-separation law (TSL) with aging. These variations in trapezoidal TSL with aging were used to develop a 3D finite element (FE) model of a closed ENF specimen that captures the non-uniform degradation across the specimen width. The TSL parameters degraded significantly at the specimen edges compared to width center for the closed ENF specimens. Validation of the FE model with aged closed ENF joint showed good agreement.http://www.sciencedirect.com/science/article/pii/S2666682023000130Adhesive jointCarbon fiber reinforced polymer (CFRP)Environmental degradationFracture mechanicsCohesive zone model |
| spellingShingle | Mohd. Tauheed Naresh V. Datla Characterization and prediction of hygrothermally aged CFRP adhesive joint subjected to mode II load Composites Part C: Open Access Adhesive joint Carbon fiber reinforced polymer (CFRP) Environmental degradation Fracture mechanics Cohesive zone model |
| title | Characterization and prediction of hygrothermally aged CFRP adhesive joint subjected to mode II load |
| title_full | Characterization and prediction of hygrothermally aged CFRP adhesive joint subjected to mode II load |
| title_fullStr | Characterization and prediction of hygrothermally aged CFRP adhesive joint subjected to mode II load |
| title_full_unstemmed | Characterization and prediction of hygrothermally aged CFRP adhesive joint subjected to mode II load |
| title_short | Characterization and prediction of hygrothermally aged CFRP adhesive joint subjected to mode II load |
| title_sort | characterization and prediction of hygrothermally aged cfrp adhesive joint subjected to mode ii load |
| topic | Adhesive joint Carbon fiber reinforced polymer (CFRP) Environmental degradation Fracture mechanics Cohesive zone model |
| url | http://www.sciencedirect.com/science/article/pii/S2666682023000130 |
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