Photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxies
The present work has investigated the fracture toughness of a model DGEBA epoxy system subject to Hidro-Thermal aging. A Photoelastic Stress Analysis technique has been implemented, showing the evolution of stresses arising throughout the water uptake process due to the non-uniform swelling of the...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2014-10-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero30/numero_30_art_17.pdf |
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| author | G. Pitarresi A. Toscano M. Scafidi M. Di Filippo S. Alessi G. Spadaro |
| author_facet | G. Pitarresi A. Toscano M. Scafidi M. Di Filippo S. Alessi G. Spadaro |
| author_sort | G. Pitarresi |
| collection | DOAJ |
| description | The present work has investigated the fracture toughness of a model DGEBA epoxy system
subject to Hidro-Thermal aging. A Photoelastic Stress Analysis technique has been implemented, showing the
evolution of stresses arising throughout the water uptake process due to the non-uniform swelling of the
material. Gravimetric and Dynamic Mechanical Thermal Analyses have further complemented the
characterization, showing the onset of plasticization effects with aging. The correlation of all previous
characterizations has allowed to conclude that an increase of KIC fracture toughness is obtained at the fully
saturated condition. In particular Photoelasticity has also revealed the onset of relevant swelling induced stresses
during the first stages of water absorption, leading to an increase of fracture toughness due to compressive
stresses settling near the crack tip. A stress free condition is instead reestablished at the later stages of
absorption, suggesting that the increased toughness of the saturated material is an effect of the modifications
induced by aging on the polymer structure. |
| format | Article |
| id | doaj-art-042b08190e6148949cc9909472f9a024 |
| institution | Kabale University |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2014-10-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-042b08190e6148949cc9909472f9a0242025-01-02T23:01:33ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932014-10-0183012713710.3221/IGF-ESIS.30.17 Photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxiesG. Pitarresi 0A. Toscano 1M. Scafidi 2M. Di Filippo 3S. Alessi 4G. Spadaro 5University of Palermo University of Palermo University of Palermo University of Palermo University of Palermo University of Palermo The present work has investigated the fracture toughness of a model DGEBA epoxy system subject to Hidro-Thermal aging. A Photoelastic Stress Analysis technique has been implemented, showing the evolution of stresses arising throughout the water uptake process due to the non-uniform swelling of the material. Gravimetric and Dynamic Mechanical Thermal Analyses have further complemented the characterization, showing the onset of plasticization effects with aging. The correlation of all previous characterizations has allowed to conclude that an increase of KIC fracture toughness is obtained at the fully saturated condition. In particular Photoelasticity has also revealed the onset of relevant swelling induced stresses during the first stages of water absorption, leading to an increase of fracture toughness due to compressive stresses settling near the crack tip. A stress free condition is instead reestablished at the later stages of absorption, suggesting that the increased toughness of the saturated material is an effect of the modifications induced by aging on the polymer structure.http://www.gruppofrattura.it/pdf/rivista/numero30/numero_30_art_17.pdfFracture ToughnessHydrothermal AgingThermosetting ResinSwelling StressesPhotoelastic Stress Analysis. |
| spellingShingle | G. Pitarresi A. Toscano M. Scafidi M. Di Filippo S. Alessi G. Spadaro Photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxies Fracture and Structural Integrity Fracture Toughness Hydrothermal Aging Thermosetting Resin Swelling Stresses Photoelastic Stress Analysis. |
| title | Photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxies |
| title_full | Photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxies |
| title_fullStr | Photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxies |
| title_full_unstemmed | Photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxies |
| title_short | Photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxies |
| title_sort | photoelastic stress analysis assisted evaluation of fracture toughness in hydrothermally aged epoxies |
| topic | Fracture Toughness Hydrothermal Aging Thermosetting Resin Swelling Stresses Photoelastic Stress Analysis. |
| url | http://www.gruppofrattura.it/pdf/rivista/numero30/numero_30_art_17.pdf |
| work_keys_str_mv | AT gpitarresi photoelasticstressanalysisassistedevaluationoffracturetoughnessinhydrothermallyagedepoxies AT atoscano photoelasticstressanalysisassistedevaluationoffracturetoughnessinhydrothermallyagedepoxies AT mscafidi photoelasticstressanalysisassistedevaluationoffracturetoughnessinhydrothermallyagedepoxies AT mdifilippo photoelasticstressanalysisassistedevaluationoffracturetoughnessinhydrothermallyagedepoxies AT salessi photoelasticstressanalysisassistedevaluationoffracturetoughnessinhydrothermallyagedepoxies AT gspadaro photoelasticstressanalysisassistedevaluationoffracturetoughnessinhydrothermallyagedepoxies |