Damage characterisation of glass/polyester composite plates subjected to low-energy impact fatigue

Azouaoui, Krimo; Ouali, Naima; Ouroua, Yacine; Mesbah, Amar; Boukharouba, Taoufik

doi:10.1016/j.jsv.2007.04.014

Cited by 26 publications

(34 citation statements)

References 14 publications

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“…The peak load showed an unusual trend: the maximum load increased with the number of the impacts. Previous work 33 on composites made with thermosetting resin and reinforced with glass fibres showed the opposite behaviour. The difference between the two behaviours was due to the difference between the thermoset and the thermoplastic materials.…”

Section: Resultsmentioning

confidence: 83%

“…The traditional composites made of thermosetting shown a completely opposite behaviour. 33 They revealed the different deformation and fracture micro-mechanisms of the self-reinforced polymers under impact loadings. For the impacts at the second and third level of energy, a second region with a sharp drop of the maximum load until penetration was observed.…”

Section: Resultsmentioning

confidence: 99%

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Experimental investigation on a fully thermoplastic composite subjected to repeated impacts

Boria

Scattina

Belingardi

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the last years, the spread of composite laminates into the engineering sectors was observed; the main reason lies in higher values of strength/weight and stiffness/weight ratios with respect to conventional materials. Firstly, the attention was focused on fibres reinforced with thermosetting matrix. Then, the necessity to move towards low density and recyclable solutions has implied the development of composites made with thermoplastic matrix. Even if the first application of thermoplastic composites can be found into no structural parts, the replacement of metallic structural parts with such material in areas potentially subjected to impact has become worthy of investigation. Depending on the field of application and on the design geometry, in fact, some components can be subjected to repeated impacts at localized sites either during fabrication, activities of routine maintenance or during service conditions. When composite material was adopted, even though the impact damage associated to the single impact event can be slight, the accumulation of the damage over time may seriously weaken the mechanical performance of the structure. In this overview, the capability of energy absorption of a new composite completely made of thermoplastic material was investigated. This material was able to combine two conflicting requirements: the recyclability and the lightweight. In particular, repeated impacts at low velocity, on self-reinforced laminates made of polypropylene (PP), were conducted by experimental drop dart tests. Repeated impacts up to the perforation or up to 40 times were performed. In the analysis, three different energy levels and three different values of the laminate thicknesses were considered in order to analyse the damage behaviour under various experimental configurations. A visual observation of the impacted specimens was done, in order to evaluate the damage progression. Moreover, the trend of the peak force interchanged between specimen and dart and the evolution of both the absorbed energy and of the bending stiffness with the impacts number were studied. The results pointed out that the maximum load and the stiffness of the specimens tended to grow increasing the number of the repeated impacts. Such trend is opposite compared to the previous results obtained by other researchers using thermosetting composites.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Experimental investigation on a fully thermoplastic composite subjected to repeated impacts

Boria

Scattina

Belingardi

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

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“…For the impact fatigue tests, a repeated impact tester (Figure 3) described earlier by Azouaoui et al [2][3] is used. It is based essentially on the principle of crankconnecting rod mechanism.…”

Section: Testing Apparatus and Specimen Fixture Systemsmentioning

confidence: 99%

“…Many works have shown the dangers and risks associated with the deterioration of mechanical properties due to the multiplication of low-energy impacts. [1][2][3][4][5][6][7][8][9] Many research programs have undertaken the evolution of damage in composite materials subjected to repeated impact. However, few works gave detailed state of damaging process and little has been done on residual properties of composites impacted repeatedly.…”

Section: Introductionmentioning

confidence: 99%

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Residual properties of composite plates subjected to impact fatigue

Mouhoubi

Azouaoui

2018

Journal of Composite Materials

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This work deals with post-impact residual mechanical behavior of composite plates made with glass fiber cloth and two different thermosetting resins (epoxy and polyester). It is well known that damages induced by multiple impacts greatly reduce the residual properties. How are the residual strength or stiffness affected by the impacts? How does impact energy and number of impacts contribute to the degradation of mechanical properties? What kind of supports induces more damages and consequently a larger reduction in residual properties? These are some questions that we attempt to clarify in this paper. To investigate and assess the effect of the energy level and number of impacts on the total induced damage and residual properties, impact fatigue tests were carried out at selected energy range of: 3 J, 4 J, 5 J, and 6 J. Then, coupons containing the damaged area are cut out, in order to estimate the tensile, compressive, and shear residual properties, particularly residual strength. The energy level and number of impacts are major factors influencing the loss of stiffness and strength. However, stiffness is more affected than strength by the repeated impacts. A clear decrease of compressive residual strength with the number of impacts for the two fixture conditions (clamped on two opposite sides and a circular clamp) is demonstrated. The drop in the case of the circular clamping is more visible, confirming a greater extent of damages. A three-parameter damage model is proposed and applied, with some conclusions are withdrawn in this investigation.

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Effect of Expert and Non-expert Workers’ Skill Level on the Quality of Glass Fiber Reinforced Composites by Hand Lay-Up Method

Xie

Chen

Yang

et al. 2016

Advances in Ergonomics of Manufacturing: Managing the Enterprise of the Future

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Damage characterisation of glass/polyester composite plates subjected to low-energy impact fatigue

Cited by 26 publications

References 14 publications

Experimental investigation on a fully thermoplastic composite subjected to repeated impacts

Experimental investigation on a fully thermoplastic composite subjected to repeated impacts

Residual properties of composite plates subjected to impact fatigue

Effect of Expert and Non-expert Workers’ Skill Level on the Quality of Glass Fiber Reinforced Composites by Hand Lay-Up Method

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