Effects of residual stresses on interlaminar radial strength of Glass-Epoxy L-bend composite laminates
The built-in heterogeneity of the composite laminates has been exploited to tailor the stiffness and strength requirements of modern structures to meet the specific functional demands. However, the non-homogeneity in these composites is the root cause for most of their failures. One of the undesirab...
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Gruppo Italiano Frattura
2022-07-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/3403/3561 |
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| author | M. A. Umarfarooq P. S. Shivakumar Gouda K. N. Bharath G. B. Veereshkumar� N. R. Banapurmath Abhilash Edacherian |
| author_facet | M. A. Umarfarooq P. S. Shivakumar Gouda K. N. Bharath G. B. Veereshkumar� N. R. Banapurmath Abhilash Edacherian |
| author_sort | M. A. Umarfarooq |
| collection | DOAJ |
| description | The built-in heterogeneity of the composite laminates has been exploited to tailor the stiffness and strength requirements of modern structures to meet the specific functional demands. However, the non-homogeneity in these composites is the root cause for most of their failures. One of the undesirable consequences of the inherited heterogeneity is the development of cure-induced stresses during composite manufacturing. This work aims to investigate the influence of process-induced stresses on interlaminar radial strength in curved composite laminates. Glass-Epoxy (GE) L-bend laminates of two different thicknesses are prepared by hand lamination technique using V-shaped tooling and cured under room temperature. The state of residual stresses in GE laminates is varied by post-curing these laminates at different temperatures. Curved bending strength (CBS) and corresponding interlaminar radial stress for delamination of L-bend laminates are evaluated experimentally using four points bending test. The residual stress profile in each GE laminate is experimentally characterized by employing the Slitting method. The results indicate that the residual stresses have a negligible effect on the critical stress for initial delamination in GE laminates, but the critical stress for delamination was found to be independent of the laminate thickness and increased with higher curing temperatures. The delaminated surfaces of L-bend laminates are studied using a scanning electronic microscope (SEM). The enhancement in the critical stress due to post-curing can be attributed to the improved fiber-matrix interfacial bonding with higher curing temperature. |
| format | Article |
| id | doaj-art-a1dc9debe5204654ba437fd114c475af |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2022-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-a1dc9debe5204654ba437fd114c475af2025-01-02T23:01:34ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932022-07-01166114015310.3221/IGF-ESIS.61.1010.3221/IGF-ESIS.61.10Effects of residual stresses on interlaminar radial strength of Glass-Epoxy L-bend composite laminatesM. A. UmarfarooqP. S. Shivakumar GoudaK. N. BharathG. B. Veereshkumar�N. R. BanapurmathAbhilash EdacherianThe built-in heterogeneity of the composite laminates has been exploited to tailor the stiffness and strength requirements of modern structures to meet the specific functional demands. However, the non-homogeneity in these composites is the root cause for most of their failures. One of the undesirable consequences of the inherited heterogeneity is the development of cure-induced stresses during composite manufacturing. This work aims to investigate the influence of process-induced stresses on interlaminar radial strength in curved composite laminates. Glass-Epoxy (GE) L-bend laminates of two different thicknesses are prepared by hand lamination technique using V-shaped tooling and cured under room temperature. The state of residual stresses in GE laminates is varied by post-curing these laminates at different temperatures. Curved bending strength (CBS) and corresponding interlaminar radial stress for delamination of L-bend laminates are evaluated experimentally using four points bending test. The residual stress profile in each GE laminate is experimentally characterized by employing the Slitting method. The results indicate that the residual stresses have a negligible effect on the critical stress for initial delamination in GE laminates, but the critical stress for delamination was found to be independent of the laminate thickness and increased with higher curing temperatures. The delaminated surfaces of L-bend laminates are studied using a scanning electronic microscope (SEM). The enhancement in the critical stress due to post-curing can be attributed to the improved fiber-matrix interfacial bonding with higher curing temperature.https://www.fracturae.com/index.php/fis/article/view/3403/3561l-bend compositesresidual stressesslitting methodinterlaminar radial stress |
| spellingShingle | M. A. Umarfarooq P. S. Shivakumar Gouda K. N. Bharath G. B. Veereshkumar� N. R. Banapurmath Abhilash Edacherian Effects of residual stresses on interlaminar radial strength of Glass-Epoxy L-bend composite laminates Fracture and Structural Integrity l-bend composites residual stresses slitting method interlaminar radial stress |
| title | Effects of residual stresses on interlaminar radial strength of Glass-Epoxy L-bend composite laminates |
| title_full | Effects of residual stresses on interlaminar radial strength of Glass-Epoxy L-bend composite laminates |
| title_fullStr | Effects of residual stresses on interlaminar radial strength of Glass-Epoxy L-bend composite laminates |
| title_full_unstemmed | Effects of residual stresses on interlaminar radial strength of Glass-Epoxy L-bend composite laminates |
| title_short | Effects of residual stresses on interlaminar radial strength of Glass-Epoxy L-bend composite laminates |
| title_sort | effects of residual stresses on interlaminar radial strength of glass epoxy l bend composite laminates |
| topic | l-bend composites residual stresses slitting method interlaminar radial stress |
| url | https://www.fracturae.com/index.php/fis/article/view/3403/3561 |
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