Characterization of Kevlar/EPDM rubbers for use as rocket motor caseinsulators

Yezzi, C.; Moore, B. B.

doi:10.2514/6.1986-1489

Cited by 9 publications

(3 citation statements)

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“…Ethylene propylene diene monomer (EPDM) composite is a type of carbonized ablation material; its low density, high elongation, and good ablation resistance have led to its wide application as internal insulation in solid rocket motors (SRMs) [1][2][3] . Additionally, EPDM possesses the lowest density among elastomers (0.85 g/cm 3 ); this is an essential property; for these reasons, EPDM is the ideal candidate matrix for elastomeric ablatives [4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Performance of EPDM Composites Under Thermal Plasma Ablative Tests

et al. 2023

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In this work, a thermal plasma-based ablation test system was used to evaluate the ablative performance of the EPDM composite. The system produces a high enthalpy plasma jet generated by a plasma (DC) torch, operating at atmospheric pressure using compressed air as working gas, enabling the variation of the thermal flux concerned with the studied EPDM composites. The samples were characterized using Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Fourier-Transform Infrared spectroscopy (FTIR), and Thermogravimetric Analysis (TGA) to investigate the morphology, mass-loss rate, the reaction layer (char formation), and chemical changes of the samples for each thermal flux. For a complete evaluation, the thermal fluxes were varied in 0.30, 0.45, 0.60, 0.75, and 0.90 MW/m 2 and for each thermal flux, disk-shape samples remained exposed to the plasma jet for 10s. During the plasma jet exposure time, the temperatures of the surface and the back of the samples were collected to verify the formed char layer's insulator capacity and the samples' thermal diffusivity for each experimental condition. The mass loss is continuous under the thermal fluxes of 0.30 and 0.45 MW/m 2 , stabilizing at 60% until 0.75 MW/m 2 . The formed char layer begins to lose its protective capacity, evidenced by the size decrease (from 800 µm to 700 µm), due to the ablation process of the reaction layer from the thermal flux of 0.90 MW/m 2 .

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Section: Introductionmentioning

confidence: 99%

Performance of EPDM Composites Under Thermal Plasma Ablative Tests

et al. 2023

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“…With this in mind, elastomeric heat shield materials have been fabricated specifically to meet the needed criteria and have served as insulation material for SRMs in the past. As of now, the state‐of‐the‐art ablative used for such an application is ethylene propylene diene monomer rubber (EPDM) reinforced with Kevlar ® . With its chemical stability, low thermal conductivity, high ablation resistance, and high physical adhesion, EPDM's performance at protecting against combustion gases is superior to other insulation ablatives.…”

Section: Introductionmentioning

confidence: 99%

Development of a shear char strength sensing technique to study thermoplastic polyurethane elastomer nanocomposites

Lewis

Jaramillo

Koo

2017

Polymers for Advanced Techs

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Ablative materials, such as thermoplastic elastomer nanocomposites (TPUNs) are used as internal insulation materials for solid rocket motors. These TPUNs are thermoplastic elastomer reinforced by montmorillonite nanoclays, carbon nanofibers, and multi‐walled carbon nanotubes. When these TPUN materials are exposed to an extreme heat flux, a char layer forms along the surface as it ablates. This research aims to use the newly developed shear strength sensor to evaluate the shear strength of this char layer, a characteristic that is important to evaluate ablative materials. This device consists of a method to apply a transverse loading on a test specimen, while measuring the reaction force and the induced strain. This device was used on several types of TPUN test specimens to demonstrate its effectiveness. As a means to determine which ablative exhibited the best performance, the energy of destruction or the energy of dissipation was developed. The maximum force was also accounted for as a secondary quantity for determining the char shear strength. This new shear char strength sensor is fully automated to ensure that each test is repeatable. This guaranteed reliability when collecting the data and eliminated the potential for human error. Copyright © 2017 John Wiley & Sons, Ltd.

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“…The EPDM insulation material is one kind of elastic thermal protection materials based on EPDM rubber with mixing chopped fiber,SiO 2 ,vulcanizator and flame retardant and molded by pressing. The EPDM insulation material has been widely used as thermal protection structure of solid rocket motor (SRM) for its superior performance [1][2][3] . With the increase of operating pressure and popular implication of propellant with high content of aluminum, the combustion gas in SRM contains large amounts of alumina particles, which causes more grievous ablation to the insulation material.…”

Section: Introductionmentioning

confidence: 99%

Research on Mechanical Model of EPDM Insulation Charring Layer

Zeng

et al. 2012

AMM

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The coupling effect of physics, chemistry and mechanics is through charring layer in the process of ablation of the insulation material. Description of the structure and mechanical properties of charring layer is the critical factor to numerical computation for foretelling the ablation of insulation material. The characteristic of charring layer structure of EPDM insulation at sorts of ablating condition were analyzed, and based on characteristic of porous medium of charring layer, the mechanical model with porosity as parameter was modeled by using theory of solid porous medium. According to the intensity determination of charring layer, the coefficient of intensity model was determined, then, the failure criterion of charring layer was set up, which can provide the mechanical parameters of charring layer for numerical computation to foretell the ablation of insulation material.

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Characterization of Kevlar/EPDM rubbers for use as rocket motor caseinsulators

Cited by 9 publications

References 0 publications

Performance of EPDM Composites Under Thermal Plasma Ablative Tests

Performance of EPDM Composites Under Thermal Plasma Ablative Tests

Development of a shear char strength sensing technique to study thermoplastic polyurethane elastomer nanocomposites

Research on Mechanical Model of EPDM Insulation Charring Layer

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