Enhanced Evaluation of the Low-Velocity Impact Response of Composite Plates

Feraboli, Paolo; Kedward, Keith T.

doi:10.2514/1.4534

Cited by 49 publications

(77 citation statements)

References 19 publications

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“…The coefficient of restitution (COR), a measure of damage resistance, is defined as the ratio of rebound to impact velocity. For configurations exhibiting geometrically linear response to impact, COR and contact duration have been shown to provide information on the instantaneous stiffness of an impact-damaged structure [19]. Contact duration and coefficient of restitution of the different configurations are compared in the present study to try and extend the use of these quantities for assessing the state of damage in structures exhibiting geometrically nonlinear response.…”

Section: Test Apparatus and Testsmentioning

confidence: 99%

“…These results indicate that for the panels considered in the present study, the value of the peak force from a force-time profile is not sufficient as a damage metric or to perform comparisons across structural configurations. For structures exhibiting geometrically linear response, the residual stiffness (the ratio of pristine to damaged contact durations) and the relative coefficient of restitution loss have been employed to quantify the loss in structural stiffness due to the onset of damage [19]. …”

Section: C1mentioning

confidence: 99%

“…Static indentation tests were conducted on one set of panels, prior to dropped-weight impact testing. Low-velocity impact is considered to be a quasi-static event and static indentation tests can provide useful information for interpreting a structure's response to low-speed impact [19,21]. The static indentation tests were conducted using the same fixtures and indentors used for the impact testing.…”

Section: Test Apparatus and Testsmentioning

confidence: 99%

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Scaling the Non-linear Impact Response of Flat and Curved Composite Panels

Ambur

Chunchu

Rose

et al. 2005

46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

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The application of scaling laws to thin flat and curved composite panels exhibiting nonlinear response when subjected to low-velocity transverse impact is investigated. Previous research has shown that the elastic impact response of structural configurations exhibiting geometrically linear response can be effectively scaled. In the present paper, a preliminary experimental study is presented to assess the applicability of the scaling laws to structural configurations exhibiting geometrically nonlinear deformations. The effect of damage on the scalability of the structural response characteristics, and the effect of scale on damage development are also investigated. Damage is evaluated using conventional methods including C-scan, specimen de-plying and visual inspection of the impacted panels. Coefficient of restitution and normalized contact duration are also used to assess the extent of damage. The results confirm the validity of the scaling parameters for elastic impacts. However, for the panels considered in the study, the extent and manifestation of damage do not scale according to the scaling laws. Furthermore, the results indicate that even though the damage does not scale, the overall panel response characteristics, as indicated by contact force profiles, do scale for some levels of damage.

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Section: Test Apparatus and Testsmentioning

confidence: 99%

Section: C1mentioning

confidence: 99%

Section: Test Apparatus and Testsmentioning

confidence: 99%

See 1 more Smart Citation

Scaling the Non-linear Impact Response of Flat and Curved Composite Panels

Ambur

Chunchu

Rose

et al. 2005

46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

Self Cite

View full text Add to dashboard Cite

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“…However, the force value hardly increased as the impact energy increased from 16 to 22 J. This indicates that there exists an impact energy threshold, after which the peak force no longer increased [24,30,31]. Actually, the peak force is independent of the impact energy after the onset of damage, where the damage evolution also dissipates the impact energy.…”

Section: Mechanical Responsesmentioning

confidence: 73%

Improvement of impact-resistant property of glass fiber-reinforced composites by carbon nanotube-modified epoxy and pre-stretched fiber fabrics

et al. 2015

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Glass fiber-reinforced plastic composites (GFRPs) are often suffered to impact loadings; it is essential to improve its damage-resistant properties and understand the energy absorption mechanisms. In this work, the low-velocity impact behaviors of GFRPs were investigated in consideration of epoxy resins modified with 0, 0.4, and 0.75 % multi-walled carbon nanotubes (MWCNTs) by weight content and pre-stretched fabric at 0, 1.27, and 2.47 kg weight. In comparison with pure GFRPs sample, MWCNT-modified specimens are effective in improving the impact resistance under impact energies at 9, 16, and 22 J in terms of reduced damage factor and enhanced perforation threshold. Microscopic fractographic analysis indicated that the incorporation of MWCNTs in epoxy matrix offered additional mechanisms through breakage, bridging, and pull-out of carbon nanotubes to favor load transfer effect, prevent crack propagation, and thus dissipate more energy. The dynamic thermo-mechanical analysis proved that MWCNTs improved the storage modulus and glass transition temperature of the composites. In addition, the pre-stretched GFRP composites showed more impact resistant than the non-stretched ones through instant load transfer effect.

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“…The CSIPAP presents a methodology to measure the residual transverse stiffness of laminates by means of a three test proce dure: a subcritical impact (in which no damage is induced) on an intact specimen, the nominal impact test at a given energy, and a second subcritical impact on a damaged specimen [45]. In the elas tic regime, contact duration between the striker and the specimen is independent of the impact energy and only depends on the effec tive structural system t c p m=K 0 p where t c is the contact time, m is the impactor mass, and K 0 is the effective transverse stiffness of the intact specimen.…”

Section: Residual Transverse Stiffnessmentioning

confidence: 99%

Experimental study of the impactor mass effect on the low velocity impact of carbon/epoxy woven laminates

Artero-Guerrero

Pernas-Sánchez

López-Puente

et al. 2015

Composite Structures

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In this work, the analysis of the impactor mass effect on the behaviour of carbon/epoxy woven laminates under low velocity impact is carried out. To this end experimental test were performed by means of a drop weigh tower in a range of energies varying from 10 to 110 J, and using three different impactor masses. Two different laminate thicknesses were considered in order to take into account its possible influence. An analysis of the impact tests is performed using the Composite Structure Impact Performance Assessment Program, in order to observe the influence of impactor mass. Once impacted, the laminates were inspected by means of a C Scan (to quantify the delamination extension) and a phased array ultrasonic system (to analyse the failure through the thickness); this non destructive anal ysis will determine the influence of the impactor mass on the laminate failure.

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Enhanced Evaluation of the Low-Velocity Impact Response of Composite Plates

Cited by 49 publications

References 19 publications

Scaling the Non-linear Impact Response of Flat and Curved Composite Panels

Scaling the Non-linear Impact Response of Flat and Curved Composite Panels

Improvement of impact-resistant property of glass fiber-reinforced composites by carbon nanotube-modified epoxy and pre-stretched fiber fabrics

Experimental study of the impactor mass effect on the low velocity impact of carbon/epoxy woven laminates

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