Impact Fatigue Damage of GFRP Materials Due to Repeated Raindrop Collisions

Prayogo, Gatot; Homma, Hiroomi; Soemardi, Tresna Priyana; Danardono, A. S.

doi:10.1007/s12666-011-0078-5

Cited by 9 publications

(9 citation statements)

References 17 publications

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“…Prayogo et al [80] investigated the fatigue damage effects of repeated raindrop collisions on chopped strand mat glass fiber reinforced epoxy composite laminates. Using 4mm diameter nylon beads to represent raindrops, the samples were subjected to repeated impact and systematically inspected for signs of damage.…”

Section: Hailstone Impact Damage Modesmentioning

confidence: 99%

“…The damage then progressed to the surfaces in the form of star cracking on the rear of the samples and ring cracking on the front face of the samples, leading eventually to delamination of the plies. Debonding between the fiber and matrix is attributed to tensile stress waves during impact and microvoid nucleation, growth and coalescence is attributed to delamination; in which shear stress is deemed to play a significant role [80]. It is prudent to note that the impact energies considered in figure 31 are well within the range of the hailstone impact energies detailed in figure 25 and although the samples considered by Prayogo et al [80] were unprotected bare laminates of CSM -which are typically weaker than that of unidirectional or weaved reinforced composites -it highlights the threat posed by such impact energies.…”

Section: Hailstone Impact Damage Modesmentioning

confidence: 99%

“…Showing the number of impact events at specified impact energies required for the onset of material damage. Source:[80]…”

mentioning

confidence: 99%

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On erosion issues associated with the leading edge of wind turbine blades

Keegan¹,

Nash²,

Stack³

2013

J. Phys. D: Appl. Phys.

194

160

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The increasing developments in wind turbine technology, coupled with an unpredictable operating environment, presents significant challenges regarding erosion issues on the leading edge of the blade tips. This review examines the potential degradation posed by the different environmental variables, with specific emphasis on both rain droplet and hailstone impact on the blade leading edge. Drawing on both the insights from experimental results and recent field data from the literature, the mechanisms of leading edge erosion are discussed. Meteorological tools that may enable rain and hailstone erosion prediction are addressed as well as potential experimental and numerical approaches that may provide insight into the nature of impact and erosion on the blade surface.

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Section: Hailstone Impact Damage Modesmentioning

confidence: 99%

Section: Hailstone Impact Damage Modesmentioning

confidence: 99%

See 1 more Smart Citation

On erosion issues associated with the leading edge of wind turbine blades

Keegan¹,

Nash²,

Stack³

2013

J. Phys. D: Appl. Phys.

194

160

View full text Add to dashboard Cite

show abstract

“…Several studies have focused on the impact fatigue property of the viscoelastic material. In order to apply different types of impacts, researchers have proposed several testing machines, such as weight dropping machines [20][21][22], swinging pendulum machines [23], and rotary machines [24]. Influencing parameters, such as testing temperature [25], the number of impacts [23] and contact time [22], were studied.…”

Section: Introductionmentioning

confidence: 99%

Impact Fatigue of Viscoelastic Materials Subjected to Pounding

2018

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Abstract:The pounding tuned mass damper (PTMD) is a novel vibration control device that can be used for many different structures. The PTMD utilizes a viscoelastic delimiter to enhance its vibration control effectiveness and robustness though pounding between the tuned mass and the viscoelastic material. However, the viscoelastic material is subjected to repeated poundings during its service life, which influences the property of the material and degrades its energy dissipation ability. Therefore, this study investigates the fatigue behavior of the viscoelastic material under impact loading. An experimental apparatus, which can generate and sense the lateral impacts, is designed and fabricated to facilitate the fatigue study of the viscoelastic material subject to impact loading. Based on experimental data, the pounding stiffness and the hysteresis loops are employed to characterize the behavior of the material. It is revealed that the impact fatigue process can be divided into two phases: the cyclic-hardening phases and the cyclic-softening phase. The energy dissipation is firstly reduced, and then increased, by the repeated impacts. In summary, with a total of 360,000 impacts, the viscous elastic material is still effective in dissipating impact energy.

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“…Wind turbine blades are typically constituted of fibre reinforced polymer composites, called laminates. A study of repeated impacts to laminates has shown that the fracture starts inside the laminate [9], suggesting that tensile stress waves reflected at the back surface opposing the impact surface play an important role in the early internal damage. Such internal damage is difficult to detect on a component in use, and a resulting sudden failure can be serious.…”

Section: Introductionmentioning

confidence: 99%

Impact damage reduction by structured surface geometry

et al. 2018

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Repeated impacts can cause damage to not only a surface but also inside the material. Mechanisms include stress-wave propagation into the material, reflection of the waves at the back surface, and subsequent repeated reflections in the vicinity of the impact and the back surface. Impact damage performance was observed for polyurethane-coated fibre composites with structured geometries at the back surfaces. Repeated impacts by rubber balls on the coated side caused damage and delamination of the coating. The laminates with structured back surfaces showed longer durability than those with a flat back surface. The in-situ acoustic measurement indicates that the acoustic power within the pulse duration was 25-40 % lower using the structured back surfaces. The observed effect can be attributed to scattered reflection at the back surface to reduce the high intensity duration of the acoustic waves.

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Impact Fatigue Damage of GFRP Materials Due to Repeated Raindrop Collisions

Cited by 9 publications

References 17 publications

On erosion issues associated with the leading edge of wind turbine blades

On erosion issues associated with the leading edge of wind turbine blades

Impact Fatigue of Viscoelastic Materials Subjected to Pounding

Impact damage reduction by structured surface geometry

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