Influence of Curing Conditions on the Mechanical Properties of Silica-Phenolic Composites: A Comprehensive Study

Güney, Önder; Demirkesen, Erdem

doi:10.17148/iarjset.2015.21101

Cited by 2 publications

(1 citation statement)

References 20 publications

(25 reference statements)

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“…It can be defined as a well‐organized heat and mass transfer action where large quantity of heat energy gets scattered during a short period with typical loss of material. It is a complicated procedure encompassing phase changes like melting vaporization, sublimation, and pyrolysis . Ablative composites follow a complex mechanism for providing the thermal safeguard that incorporates heat rejection through reradiation, action of heat generated from the deterioration of the materials, insulation, enormous heat absorption, and the latent heat of thermal deterioration.…”

Section: Ablation In Elastomersmentioning

confidence: 99%

Recent developments in elastomeric heat shielding materials for solid rocket motor casing application for future perspective

George

Panda

Mohanty

et al. 2017

Polymers for Advanced Techs

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Catastrophic breakdown that occurs during the flight of supersonic vehicles demands more focused research in the insulation of rocket engines. At present, optimization of polymeric ablatives as viable insulation for solid rocket motor casing has a prominent role in the successful mission of rockets. Among polymers, elastomer serves an imperative part. Comprehensive investigations were disclosed, especially in the elastomeric heat shielding materials with various reinforcing agents. In this paper, research progress of mostly used elastomers is reviewed, and a circumstantial understanding about the features of ablation and insulation has been validated. 2-4 Therefore, to protect the vehicle from miserable failure of spacecraft, some design features are added to cope with the aerodynamic heating. 5Thermal protection system (TPS) materials impart heat shield to protect the structure, aerodynamic surface and the payload of missiles, and those vehicles interacting with the hypersonic environment. 6,7 Polymeric ablative materials serve to effect as TPS that defends space vehicles and probes during the atmospheric entry; they are effective to produce passively cooled rocket combustion chambers 8 and to render insulation to the solid rocket motors (SRMs) at high temperature. [9][10][11] Although some nonpolymeric materials such as inorganic polymers/ceramics or metals have been used as ablative TPS, polymeric ablatives represent the most flexible category of ablatives. In contrast to the inorganic polymers, polymer ablatives have more inborn benefits: high-heat shock resistance, lower density, good mechanical strength, and thermal insulation capabilities. 12The broad range of heat shielding materials (HSMs) for rocket motor casing is produced from reinforced thermosets or elastomers. [13][14][15][16][17][18][19] The most assuring material for the HSM for rocket motors is the elastomers, which can be produced as rubbers, foamed rubbers, or fiber-reinforced composite materials. On the grounds of lightweight, low thermal conductivity, stability in the mechanical and thermal stresses during the operation, elastomeric HSMs (EHSMs) can find relevance in the insulation of SRM casing where thermal insulation is a prime necessity. They do not possess the ability to form cokes without the introduction of special additives due to the linear chain structure of elastomers, thus no solid carbonic residue on thermal decomposition.Also, elastomers have high elongation at break and the capacity to withstand the mechanical and the thermal stresses during the manufacturing and in use. 20This review puts the elastomeric materials as ablative insulators for SRM into frame and would confer the readers the progress that has been attained in developing relatively low surface eroding and ablative insulating systems for SRM. These systems can be used to manufacture variety of ablative TPS systems for rocket motor casing application and would provide an idea regarding the composite system that would behave elastomeric as well as ablative. Scrutini...

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Section: Ablation In Elastomersmentioning

confidence: 99%

Recent developments in elastomeric heat shielding materials for solid rocket motor casing application for future perspective

George

Panda

Mohanty

et al. 2017

Polymers for Advanced Techs

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Effect of notch position and orientation on flexural behaviour of neat epoxy GFRP laminates

Singh

Gaurav

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this work the effect of notch position on the flexural properties of neat epoxy GFRP laminates were assessed. Three different set of samples consisting three specimens were prepared. First batch of samples comprised of specimen without any stress raisers, while other two batches consisted samples with 1mm deep and 1 mm wide groove. Further, the notched samples were tested at two different orientations, making the notch to appear on the top (compressive face) and bottom (tensile face) of the specimens. Testing was conducted at the loading rate of 1mm/min according to ASTM D790-17 standard. Test results revealed that when notch was present on the loading side (compressive face), the ultimate strength increased, as the stress raiser compensated the compressive deformation (fiber crushing) and allowed the laminate to go for higher deformation. Whereas the same notch when appeared on tensile face, strength of material decreased. Average ultimate strength of samples without notch was 234.7 MPa while the same for samples with notch on compressive and tensile face were 240.7 MPa and 194.5 MPa respectively. Average flexure modulus of the samples with notch on the compressive and tensile side was 13.27 GPa and 11.90 GPa respectively as compared to 14.44 GPa of sample without notch.

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Influence of Curing Conditions on the Mechanical Properties of Silica-Phenolic Composites: A Comprehensive Study

Cited by 2 publications

References 20 publications

Recent developments in elastomeric heat shielding materials for solid rocket motor casing application for future perspective

Recent developments in elastomeric heat shielding materials for solid rocket motor casing application for future perspective

Effect of notch position and orientation on flexural behaviour of neat epoxy GFRP laminates

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