Mechanical and thermal properties of filamentary-reinforced structural composites at cryogenic temperatures 1: Glass-reinforced composites

Kasen, M. B.

doi:10.1016/0011-2275(75)90079-x

Cited by 65 publications

(5 citation statements)

References 21 publications

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“…Yano et al [8] and Bay et al [9], but they have limited coverage of the literature or address only indirectly related topics. For the sake of completeness, the reader can 10 refer to older review articles covering the periods of 1975-1981 [10] and 1960-1975 [11][12][13] and reviews on cryogenic strap and strut structures [14,15].…”

Section: Introductionmentioning

confidence: 99%

Properties of cryogenic and low temperature composite materials – A review

2020

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Section: Introductionmentioning

confidence: 99%

Properties of cryogenic and low temperature composite materials – A review

2020

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“…Besides, the thermal coefficient of shrinkage / expansion of the three phases present in Glare (ceramic fibers, epoxy resin and metal sheets) are determinant to establish the improvement of resin / fibers interplay. In this regard, since the resin matrix shrink more than the glass fibers, fiber compression and corresponding increase on fiber / matrix friction imply in improved toughening / strengthening mechanisms (e.g., fiber pull-out), not to mention the enhancement of the resin matrix resistance to cracking [9,10,[13][14][15][16][17][18][19][20]. During impact at -196 °C (COLD condition) these effects are apparently improved, while at +100 °C (HOT) stress relaxation can take place overriding this, in principle, beneficial effect.…”

Section: Pih and Mxctmentioning

confidence: 99%

Impact Behavior of Glare Hybrid Laminate Under Extreme Thermal Conditions

Goyo-Brito¹,

Vogler²,

Silva³

et al. 2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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Artificial bodies intentionally placed into low orbit around the earth (LEO) are exposed to critical thermal and mechanical in-service conditions, e.g. severe thermal cycling and micrometeoroid impact. To better understand the response of Glare™-5 2/1 fiber-metal laminate under such conditions, pristine test coupons were subjected to low-energy ballistic impact (21 J) at the temperatures of-196 and 100 °C. Another set of test pieces went through the same experimental conditions, except that they were first submitted to 1,200 thermal shock cycles from-196 to 100 °C. Thermally conditioned specimens exhibited higher resistance to externally visible damage in both test temperatures. On the other hand, internal failure mechanisms characterized via microscopy and X-ray CT inspection techniques have shown that specimens submitted to cryogenic impact after repeated thermal cycling presented the best impact resistance, being age hardening of outer 2024-T3 Al-alloy sheets a possible enhancing factor; besides, residual thermal stresses in the core glass fiber-reinforced epoxy matrix, associated to the post-cure of the latter may have led to higher interlaminar strength.

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“…The thermal properties of unidirectional glass-epoxy was obtained from Ref. 28. The temperature distribution generated from the heat transfer program was then plotted as isothermal contours using SAS/GRAPH on IBM mainframe computer.…”

Section: Smentioning

confidence: 99%

Frequency dependent heat generation during vibrothermographic testing of composite materials

1991

NDT & E International

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This investigation concerns the frequency dependent heat generation behavior and the heat generation mechanisms for the thermal patterns of delamination in fiber reinforced composites during a vibrothermographic test, which uses real time thermography as a nondestructive evaluation of a structure or a component excited with mechanical vibration. A local resonance model was proposed in the past to describe the frequency dependent heat generation behavior during a vibrothermographic test, and this model was used as a basis for writing software for calculating the natural frequencies of a plate with the size of delamination. Vibrothermographic tests were performed on three glass-epoxy panels that each contained four different sized simulated delaminations. Comparison between the observed vibrothermal peak frequencies and the natural frequencies predicted by the local resonance model, and investigations of the thermoelastic emission field in the delamination region using SPA TE, were made to determine the validity of the local resonance model. A significant conclusion of the results is that the local resonance is indeed the mechanics model for the frequency dependent heat generation behavior.A careful measurement of the degree of heating of both sides of [0 5 ] glassepoxy panel with delaminations on the 2-3 ply interface, and comparison between the predicted heat patterns generated from a finite difference heat transfer program and observed heat patterns, was made to identify the heat generation mechanism. The results show that the majority of heat generation during vibrothermographic testing results from higher stresses or strains due to local resonance. The heat generation was affected by the combination of the principal strains and shear strain for the lower modes of resonant vibration, and was dominated by the shear strain for the higher modes of resonant vibration.Impact damaged graphite-epoxy panels were also inspected constituting an application of vibrothermography on real damaged components. The degree of heating of the damage were measured through a frequency range, and the damage severity was inspected by ultrasonic C-scan and edge replication. From comparison of two plots of the degree of heating versus exciting frequency, either the area under the curve or the number of vibrothermal peak frequencies, the severity of the damage can be qualitatively identified.

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Mechanical and thermal properties of filamentary-reinforced structural composites at cryogenic temperatures 1: Glass-reinforced composites

Cited by 65 publications

References 21 publications

Properties of cryogenic and low temperature composite materials – A review

Properties of cryogenic and low temperature composite materials – A review

Impact Behavior of Glare Hybrid Laminate Under Extreme Thermal Conditions

Frequency dependent heat generation during vibrothermographic testing of composite materials

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