Evaluation of a critical impact energy in GFRP under fatigue loading

Kosmann, N.; Riecken, B.T.; Schmutzler, Henrik; Knoll, Johannes; Schulte, Karl; Fiedler, Bodo

doi:10.1016/j.compscitech.2014.07.010

Cited by 17 publications

(6 citation statements)

References 17 publications

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“…The comparison of coupon tests with multiaxial tests on stringer stiffened panels showed the behaviour of internal damages as voids or impacts have already been studied thoroughly on the coupon level [6][7][8][9][10][11][12][13][14][15][16]. However, a final verification on its influence on the level of panels is necessary, as further influencing factors by specific panel geometry and design (stiffeners) have to be considered.…”

Section: Resultsmentioning

confidence: 99%

“…However, the influence of the aforementioned defects when embedded in a composite panel cannot totally be predicted. Thus, the authors collaborated in a joint research project on the topic of glass fibre non-crimp fabric reinforced epoxy composites covering the range from coupons to large scale specimens [7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The influence of a critical impact energy level, depending on the fatigue load level and causing a dramatic decrease in fatigue life is described . At low fatigue load levels, a rather high impact energy results in a considerable loss of fatigue lifetime, while at higher fatigue load levels already small impacts lead to a significant decrease in fatigue lifetime.…”

Section: Introductionmentioning

confidence: 99%

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Influence of voids and impact damage on the fatigue behaviour of large scale composites

Protz

Kosmann

Fritsch

et al. 2016

Materialwissenschaft Werkst

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Defects in laminated composite structures like voids and impact damages have a major influence on the fatigue behaviour. These defects may occur in the manufacturing process and during lifetime of composite parts and lead to matrix cracks within single layers and to delaminations between adjacent layers with different fibre orientations. We investigated the relationship between voids and impact damage and fatigue lifetime. Specimens made of a glass fibre non‐crimp fabric were produced by vacuum assisted resin infusion. Voids were introduced by air‐bypass simulating a leakage during the vacuum assisted resin infusion‐process. Impact damage was induced using a canon. Stringer‐panels with the basic dimensions of 1000 mm × 1200 mm and a radius of 1980 mm were tested under multiaxial load situations in a hexapod test rig and a tension/compression‐shear test rig.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of voids and impact damage on the fatigue behaviour of large scale composites

Protz

Kosmann

Fritsch

et al. 2016

Materialwissenschaft Werkst

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“…Specimens were prepared from laminates consisting of two glass fibre non crimp fabrics (GF-NCF) made of the roving OC 111A from Owens Corning infiltrated with epoxy resin Epikote MGS RIM 135 and curing agent Epikure MGS RIMH 137 from Momentive by vacuum assisted resin transfer moulding (VARTM) as described in [36]. The laminates consist of eight plies [0°À45°9 0°45°]s, with a fibre volume content of 34.3% ± 3%.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Determining the effect of voids in GFRP on the damage behaviour under compression loading using acoustic emission

Kosmann

Karsten

Schuett

et al. 2015

Composites Part B: Engineering

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“…Several studies have appeared in recent years documenting the presence of voids in FRPs. Some of these studies describe the formation of voids during the infusion process and the other studies explore the effect of voids on the mechanical properties of FRPs . In references , the effect of voids on the mechanical properties of glass non‐crimp fabric plastic composites is reported.…”

Section: Introductionmentioning

confidence: 99%

Influence of defined amount of voids on the mechanical properties of carbon fiber‐reinforced plastics

Ashir

Nocke

Bulavinov³

et al. 2018

Polymer Composites

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The fault‐free fabrication of fiber‐reinforced plastics (FRPs) is a big hurdle for textile and composite manufacturers. Voids are generated during the infiltration process of FRPs, which then reduce the mechanical performance of FRPs. This paper describes the effect of defined amount of voids on the mechanical properties, such as tensile, bending, impact and inter‐laminar shear strength of FRPs. The defined amount of voids in carbon FRPs are produced by a newly developed process—mixing of a foaming agent with resin system during the infusion process. The utmost advantage of this process is simple, time‐saving and reproducible. The produced FRPs from this process can be utilized for the validation of ultrasonic testing of FRPs. Four types of FRPs with six carbon layers are fabricated by a vacuum assisted resin infusion process. Carbon fibers are chosen in this study because of their growing market potential. Then, the mechanical properties of the produced carbon FRPs are tested. Besides the mechanical testing, the microscopic testing and ultrasound testing is executed to qualitatively analyze the length and distribution of produced voids. Results reveal that the mechanical properties of carbon FRPs reduce by an increase in defined amount of voids. POLYM. COMPOS., 40:E1049–E1056, 2019. © 2018 Society of Plastics Engineers

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Evaluation of a critical impact energy in GFRP under fatigue loading

Cited by 17 publications

References 17 publications

Influence of voids and impact damage on the fatigue behaviour of large scale composites

Influence of voids and impact damage on the fatigue behaviour of large scale composites

Determining the effect of voids in GFRP on the damage behaviour under compression loading using acoustic emission

Influence of defined amount of voids on the mechanical properties of carbon fiber‐reinforced plastics

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