Mass criterion for wave controlled impact response of composite plates

Olsson, Robin

doi:10.1016/s1359-835x(00)00020-8

Cited by 262 publications

(150 citation statements)

References 22 publications

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“…The corresponding average impact energy and speed are also indicated. All scenarios fall in the category of a large-mass impact, in which the test durations are much larger than the time needed for stress waves to reach the boundaries [18]. The test are therefore appropriately termed 'low-velocity' and the plate deformation should be similar to QSI.…”

Section: Low-velocity Impactmentioning

confidence: 99%

Comparing damage from low-velocity impact and quasi-static indentation in automotive carbon/epoxy and glass/polyamide-6 laminates

et al. 2018

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The results of a low-velocity impact programme on both carbon/epoxy and glass/polyamide-6 composite laminates are compared to the results of quasi-static indentation. Cross-ply and quasiisotropic stacking sequences are impacted and quasi-static indentation tests are performed up to the same maximum displacement. The response of the laminates to both test methods is compared in terms of force-displacement behaviour, dissipated energy and resulting damage. Significant differences between low-velocity impact and quasi-static indentation are found for both material systems. It is therefore concluded that the test methods cannot be interchanged for material characterisation.

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Section: Low-velocity Impactmentioning

confidence: 99%

Comparing damage from low-velocity impact and quasi-static indentation in automotive carbon/epoxy and glass/polyamide-6 laminates

et al. 2018

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“…This was done based on the assumption that the impact load of ski poles can, under realistic circumstances, be well approximated as a quasi-static event, see [1] for a detailed motivation. In the 3PB test, specimens of length 230 mm were supported by two steel cylinders.…”

Section: Mechanical Tests Methods Of Skigo1 and Skigo2mentioning

confidence: 99%

Increased Impact Resistance of Cross-Country Ski Poles by Improved, Simulation Assisted Composite Design

Granlund

Gräsberg

Zrida

et al. 2018

The 12th Conference of the International Sports Engineering Association

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High-end carbon fibre reinforced polymer (CFRP) ski poles of today are lighter and stiffer than previous generations, explained by the higher specific stiffness (stiffness to density ratio) for CFRPs, typically in the range of 0.1 GPa m 3 /kg compared to approximately 0.03 GPa m 3 /kg for aluminium. In this study, we have analysed different CFRP pole designs on the market by mechanical testing and microscopy. We conclude that the strive for optimised weight and bending stiffness has generally driven the pole design to be sub-optimal towards stiffness making them unnecessarily sensitive to transverse and impact loads. Based on the experimental findings, we have developed numerical simulation models to predict the bending and stress state in CFRP ski poles under axial as well as transverse (impact) loading conditions. These numerical model has then been used to find a new conceptual pole design with similar weight and stiffness but with seemingly higher impact resistance.

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“…Response types are given as a response dominated by dilatational waves with very short impact times, a response dominated by flexural waves with short impact times and a QS response with long impact times. However, contrary to this, Olsson in a later paper [8] states "For sufficiently high velocities (usually more than 70 m/s for carbon/epoxy laminates) the impactor/plate mass ratio is irrelevant for the response type, as penetration occurs prior to any deflection", and also refers to other uses of velocity, such as a delaminating damage threshold velocity.…”

Section: Literature Surveymentioning

confidence: 99%

Design, Fabrication and Testing Of High Velocity Measuring Devices Used In Bird/Ice Pellet Canister Launcher Setup

Khan¹,

Safiulla²

2014

IJIRSET

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Velocity of projectiles plays an important role in determining the response and behaviour of a target under impact. In this project metallic canister with a soft projectile, which is one of the critical dynamic components, is used to launch bird/ice pellet, to study its influence on the behaviour of aircraft and aero-engine parts. This is done by using conventional compressed air launcher which launches the projectile velocities up to 200 m/s. The canisters which house the test projectile collapse against canister arrester located at the delivery end of the launcher. The collapse characteristics of the canisters are dependent on the geometry of the tip of the arresters, material of the canisters, the shape of the canisters and the heat treatment process adapted for canisters. The impact load of the canister on the arrester can be up to several tonnes axially. This force is a function of the collapsibility of the canister at impact and in turn it is determined by the operating pressure of the launcher. It is therefore necessary to develop a velocity measuring system, which determines the dynamic axial loads on the launcher as well as the target plate, which in turn helps in studying the collapsibility parameter of the canister itself.In order to measure the high velocity of the projectile three measuring devices, namely, optical laser sensor, based on programmable logic device, copper wire and graphite rod based devices are developed and used. To provide adequate redundancy for the complex, highly dynamic and costly impact tests, two of these three velocity measuring devices are used simultaneously: (1) copper wire based sensing system and (2) graphite rod based sensing system. The measuring device input parameter is fabricated on a gun barrel with acrylic fixture at two positions at a distance of 1 m before the arrester where the canister strikes and collapses. At initial and final position, optical transmitter and receiver give the delay time when the canister passes through it by obstructing the sensing signal path. The copper wire circuit based device gives open circuit delay between the two points when canister breaks it. The time taken to travel 1m distance by the canister in the gun barrel is obtained from the device and the velocity of the canister or projectile is experimentally evaluated.

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Mass criterion for wave controlled impact response of composite plates

Cited by 262 publications

References 22 publications

Comparing damage from low-velocity impact and quasi-static indentation in automotive carbon/epoxy and glass/polyamide-6 laminates

Comparing damage from low-velocity impact and quasi-static indentation in automotive carbon/epoxy and glass/polyamide-6 laminates

Increased Impact Resistance of Cross-Country Ski Poles by Improved, Simulation Assisted Composite Design

Design, Fabrication and Testing Of High Velocity Measuring Devices Used In Bird/Ice Pellet Canister Launcher Setup

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