Cryogenic vacuum tight adhesive

Anashkin, O.P.; Кейлин, В.Е.; Patrikeev, V. M.

doi:10.1016/s0011-2275(99)00089-2

Cited by 13 publications

(6 citation statements)

References 4 publications

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“…Thus, the sign of improvement in the shear value after cryogenic conditioning is probably due to differential thermal contraction (Figures 3 and 4) of the matrix during sudden cooling which leads to the development of greater cryogenic compressive stresses and may increase the resistance to debonding and better adhesion by mechanical keying factor at the interface between fiber and the matrix [12,13]. The rise in ILSS value may be attributed to the improved adhesion by cryogenic conditioning and also by the post-curing strengthening phenomena [1]. The cryogenic hardening was found to be one of the prominent factors responsible for enhancement in wear performance of composites [14].…”

Section: Resultsmentioning

confidence: 99%

“…The rise in ILSS value may be attributed to the improved adhesion by cryogenic conditioning and also by the post-curing strengthening phenomena [1]. The cryogenic hardening was found to be one of the prominent factors responsible for enhancement in wear performance of composites [14].…”

Section: Dsc Analysismentioning

confidence: 96%

“…These are the modern engineering materials that have wide applications in a range of areas from aerospace, automobiles and boats to cryogenic equipments such as cryogenic fuel tanks, cryogenic fuel delivery lines, cryogenic wind tunnels and parts of the cryogenic side of turbo-pumps 1 because of their ease of handling, low fabrication cost and excellent mechanical properties. Epoxy resins as the matrix for fibre reinforced plastics have been used in cryogenic tankage in RLV (Reusable Launch Vehicle) thermal insulation, electrical insulation, structural support and adhesives for vacuum tight joints [1], as well as in permeability barriers, which provide minimal structural support in superconducting magnets at low temperatures [2]. When the temperature is decreased down to cryogenic temperature internal stresses are generated in the epoxy matrix due to thermal contraction.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Behavior of Glass/Epoxy Composites at Liquid Nitrogen Temperature

Kumar

Sharma

Ray

2008

Journal of Reinforced Plastics and Composites

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The present experimental investigation deals with the mechanical behavior of glass/epoxy composites at cryogenic temperature. Woven and chopped E-glass fibers of 50 weight percentage were reinforced with epoxy matrix to prepare the laminated composites. 3-point bend tests were carried out to assess interlaminar fracture behavior at cryogenic and at ambient conditions. The specimens were tested at a range of 2mm/min to 500mm/min crosshead speed to evaluate the sensitivity of mechanical response during loading at these conditions. The mechanical performances of the laminated specimens at cryogenic conditions were compared with room temperature property by using SEM photographs. DSC was carried out to study whether there is any change in glass transition temperature. Glass/epoxy composites were found to be loading rate sensitive. DSC analysis shows increase in glass transition temperature after cryogenic conditioning which may be due to irreversibility of the chain mobility. The phenomenological behavior of these composite materials may be attributed to polymer relaxation at low temperature, cryogenic hardening, matrix cracking, and misfit strain due to a differential thermal coefficient of the fiber and the matrix and also by an enhanced mechanical keying factor by compressive residual stresses generated at cryogenic temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Dsc Analysismentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Mechanical Behavior of Glass/Epoxy Composites at Liquid Nitrogen Temperature

Kumar

Sharma

Ray

2008

Journal of Reinforced Plastics and Composites

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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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“…Epoxy resin is one of the most important thermosetting materials owing to its low cost, ease of processing, and good thermal, mechanical, and electrical properties. They are used widely in aerospace, electrical, electronic, and automobile industries,1–3 as structural adhesives4, 5 and as matrices for composites. However, these resins are quite brittle showing poor resistance to crack propagation.…”

Section: Introductionmentioning

confidence: 99%

Effect of reactive poly(ethylene glycol) flexible chains on curing kinetics and impact properties of bisphenol‐a glycidyl ether epoxy

Yao

Kuila

Sun

et al. 2011

J of Applied Polymer Sci

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Bisphenol-A glycidyl ether epoxy resin was modified using reactive poly(ethylene glycol) (PEO). Dynamic mechanical analysis showed that introducing PEO chains into the structure of the epoxy resin increased the mobility of the molecular segments of the epoxy network. Impact strength was improved with the addition of PEO at both room (RT) and cryogenic (CT, 77 K) temperature. The curing kinetics of the modified epoxy resin with polyoxypropylene diamines was examined by differential scanning calorimetry (DSC). Curing kinetic parameters were determined from nonisothermal DSC curves. Kinetic analysis suggested that the two-parameter autocatalytic model suitably describes the kinetics of the curing reaction. Increasing the reactive PEO content decreased the heat flow of curing with little effect on activation energy (E a ), pre-exponential factor (A), or reaction order (m and n).

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Cryogenic vacuum tight adhesive

Cited by 13 publications

References 4 publications

Mechanical Behavior of Glass/Epoxy Composites at Liquid Nitrogen Temperature

Mechanical Behavior of Glass/Epoxy Composites at Liquid Nitrogen Temperature

Impact Behavior of Glare Hybrid Laminate Under Extreme Thermal Conditions

Effect of reactive poly(ethylene glycol) flexible chains on curing kinetics and impact properties of bisphenol‐a glycidyl ether epoxy

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