Fatigue crack propagation in short-fiber reinforced plastics
The influence of fiber orientation on the crack propagation behavior was studied with single edgenotched specimens which were cut from an injection-molded plate of short-fiber reinforced plastics of polyphenylenesulphide (PPS) reinforced with 30wt% carbon fibers. Specimens were cut at five fiber a...
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Gruppo Italiano Frattura
2015-10-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero34/numero_34_art_33.pdf |
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| author | K. Tanaka K. Oharada D. Yamada K. Shimizu |
| author_facet | K. Tanaka K. Oharada D. Yamada K. Shimizu |
| author_sort | K. Tanaka |
| collection | DOAJ |
| description | The influence of fiber orientation on the crack propagation behavior was studied with single edgenotched
specimens which were cut from an injection-molded plate of short-fiber reinforced plastics of
polyphenylenesulphide (PPS) reinforced with 30wt% carbon fibers. Specimens were cut at five fiber angles relative to
the molding direction, i.e. = 0° (MD), 22.5°, 45°, 67.5°, 90° (TD). Fracture mechanics parameters derived
based on anisotropic elasticity were used as a crack driving force. Macroscopic crack propagation path was
nearly perpendicular to the loading axis for the cases of MD and TD. For the other fiber angles, the crack path
was inclined because the crack tended to propagate along inclined fibers. For mode I crack propagation in MD and
TD, the resistance to crack propagation is improved by fiber reinforcement, when the rate is correlated to the range of
stress intensity factor. The crack propagation rate, da/dN, was slowest for MD and fastest for TD. For each material, the
crack propagation rate is higher for larger R ratio. The effect of R ratio on da/dN diminished in the relation between
da/dN and the range of energy release rate, GI. Difference among MD, TD and matrix resin becomes small when
da/dN correlated to a parameter corresponding the crack-tip radius, HGI, where H is compliance parameter. Fatigue
cracks propagated under mixed loading of mode I and II for the fiber angles other than 0° and 90°. The data of the crack
propagation rate correlated to the range of total energy release rate, Gtotal, lie between the relations obtained for MD and
TD. All data of crack propagation tend to merge a single relation when the rate is correlated to the range of total energy
release rate divided by Young’s modulus. |
| format | Article |
| id | doaj-art-bcf7dcdd9d884ca5a9c28cec226fdfea |
| institution | Kabale University |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2015-10-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-bcf7dcdd9d884ca5a9c28cec226fdfea2025-01-03T00:39:42ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932015-10-0193430931710.3221/IGF-ESIS.34.33Fatigue crack propagation in short-fiber reinforced plasticsK. Tanaka0K. Oharada1D. Yamada2K. Shimizu3Meijo University,JapanMeijo University,JapanMeijo University,JapanMeijo University,JapanThe influence of fiber orientation on the crack propagation behavior was studied with single edgenotched specimens which were cut from an injection-molded plate of short-fiber reinforced plastics of polyphenylenesulphide (PPS) reinforced with 30wt% carbon fibers. Specimens were cut at five fiber angles relative to the molding direction, i.e. = 0° (MD), 22.5°, 45°, 67.5°, 90° (TD). Fracture mechanics parameters derived based on anisotropic elasticity were used as a crack driving force. Macroscopic crack propagation path was nearly perpendicular to the loading axis for the cases of MD and TD. For the other fiber angles, the crack path was inclined because the crack tended to propagate along inclined fibers. For mode I crack propagation in MD and TD, the resistance to crack propagation is improved by fiber reinforcement, when the rate is correlated to the range of stress intensity factor. The crack propagation rate, da/dN, was slowest for MD and fastest for TD. For each material, the crack propagation rate is higher for larger R ratio. The effect of R ratio on da/dN diminished in the relation between da/dN and the range of energy release rate, GI. Difference among MD, TD and matrix resin becomes small when da/dN correlated to a parameter corresponding the crack-tip radius, HGI, where H is compliance parameter. Fatigue cracks propagated under mixed loading of mode I and II for the fiber angles other than 0° and 90°. The data of the crack propagation rate correlated to the range of total energy release rate, Gtotal, lie between the relations obtained for MD and TD. All data of crack propagation tend to merge a single relation when the rate is correlated to the range of total energy release rate divided by Young’s modulus.http://www.gruppofrattura.it/pdf/rivista/numero34/numero_34_art_33.pdfFatigue crack propagationShort-fiber reinforced plasticsFiber orientationFracture mechanics |
| spellingShingle | K. Tanaka K. Oharada D. Yamada K. Shimizu Fatigue crack propagation in short-fiber reinforced plastics Fracture and Structural Integrity Fatigue crack propagation Short-fiber reinforced plastics Fiber orientation Fracture mechanics |
| title | Fatigue crack propagation in short-fiber reinforced plastics |
| title_full | Fatigue crack propagation in short-fiber reinforced plastics |
| title_fullStr | Fatigue crack propagation in short-fiber reinforced plastics |
| title_full_unstemmed | Fatigue crack propagation in short-fiber reinforced plastics |
| title_short | Fatigue crack propagation in short-fiber reinforced plastics |
| title_sort | fatigue crack propagation in short fiber reinforced plastics |
| topic | Fatigue crack propagation Short-fiber reinforced plastics Fiber orientation Fracture mechanics |
| url | http://www.gruppofrattura.it/pdf/rivista/numero34/numero_34_art_33.pdf |
| work_keys_str_mv | AT ktanaka fatiguecrackpropagationinshortfiberreinforcedplastics AT koharada fatiguecrackpropagationinshortfiberreinforcedplastics AT dyamada fatiguecrackpropagationinshortfiberreinforcedplastics AT kshimizu fatiguecrackpropagationinshortfiberreinforcedplastics |