The Measurement of Absorbed Charpy Impact Energy Using a Vertical Drop Tower

Lieb, KC; Horstman, RT; Peters, KA; Enright, CF; Meltzer, RL; Vieth, MB; Server, W.L.; Henderson, GR

doi:10.1520/jte11558j

Cited by 3 publications

(2 citation statements)

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“…7,25–29 A few references compared the low-velocity impact behaviors of thermosetting and thermoplastic laminates at Room Temperature (RT) 1,2,30,31 and at low 4,32–34 and high temperatures. 21,24,34,35 TP laminates usually demonstrate lower structural loss up to 200%, lower contact force by 14%, and lower absorbed energy by 48% compared to those of TS counterparts. They were characterized by a highly ductile behavior resulting in an extended plasticity in the interlaminar region and in matrix-rich regions.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Pendulum impact testing machines and drop towers are both critical to validating the low velocity impact performance and damage tolerance of materials. [20][21][22] Standard Charpy calibration specimens designed for verification of pendulum impact machines were tested on a vertical drop tower impact machine. 20,23,24 Influence of temperature on the impact behaviour of polymer matrix composites Thermoplastic (denoted TP) composites have gained increasing attention for their higher toughness and better damage tolerance than thermoset (denoted TS) composites.…”

Section: Introductionmentioning

confidence: 99%

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Influence of temperature degradation on the low velocity impact behavior of hybrid thermoplastic PEEK laminates

Vieille

Coppalle

2023

Journal of Thermoplastic Composite Materials

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To evaluate the severity of thermal degradation on the impact response of carbon (C) and glass (G) fibers reinforced PolyEther Ether Ketone (PEEK) laminates, low velocity impact tests were conducted at a temperature higher than the glass transition temperature Tg (150°C) and after exposure to a kerosene flame (5-10-15′). The first important effect resulting from temperature increase was a reduction of the impact energy required to induce BVID (Barely Visible Impact Damage). The second effect was that matrix ductility (enhanced at T>Tg) contributes to significantly modify the permanent indentation. Not surprisingly, the plastic and viscoplastic deformation mechanisms being ruled by the PEEK matrix behavior at high temperature, the permanent indentation increases by almost 40% for all impact energies. Contrary to the external damage represented by permanent indentation, temperature has a tremendous influence on the internal damage as there was virtually no delamination in the CG/PEEK laminates impacted at Room Temperature (RT) and 150°C. At last, impact tests conducted on specimens exposed to a kerosene flame implied that the impact bearing capabilities of CG/PEEK laminates dramatically decreased after a 5′ exposure and became even critical after 10′ as perforation was observed. For 40 J impacts, the permanent indentation was multiplied by 3–9 with respect to the as-received specimens.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of temperature degradation on the low velocity impact behavior of hybrid thermoplastic PEEK laminates

Vieille

Coppalle

2023

Journal of Thermoplastic Composite Materials

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High temperature in situ impact testing of hybrid thermoplastic polyether ether ketone laminates

et al. 2023

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In order to evaluate the severity of thermal degradation on the impact response of carbon (C) and glass (G) fibers reinforced polyether ether ketone laminates, low velocity impact tests have been conducted at a temperature higher than the glass transition temperature (150°C). An instrumented Charpy pendulum (CP) equipped with a heating device was specifically designed to estimate its capability to perform low velocity impact tests at high temperature. The first important effect resulting from temperature increase is a reduction of the impact energy required to induce the barely visible impact damage (BVID), whose role is utmost important regarding the damage tolerance. The second effect is that temperature has also a tremendous influence on the internal damage as there is virtually no delamination at high temperature for impact energies. Finally, compared with the impact behaviors observed with the same laminates impacted with a drop tower and quasi‐static indentation, the impact velocity is about 2.5–3 times as low during CP impacts. As a result, slow loading rates are instrumental in increasing both the dissipated energies and the permanent indentation (PI) values (1.6–2 times as high) that are always higher than the BVID. Ultimately, as higher PI is usually correlated to higher impact damage tolerance.

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Instrumented Charpy test review and application to structural integrity

Server¹

2002

European Structural Integrity Society

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The Measurement of Absorbed Charpy Impact Energy Using a Vertical Drop Tower

Cited by 3 publications

References 1 publication

Influence of temperature degradation on the low velocity impact behavior of hybrid thermoplastic PEEK laminates

Influence of temperature degradation on the low velocity impact behavior of hybrid thermoplastic PEEK laminates

High temperature in situ impact testing of hybrid thermoplastic polyether ether ketone laminates

Instrumented Charpy test review and application to structural integrity

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