A Study on Improvement of DMA-based Small Specimen Measurement Method for Evaluating Stress Relaxation Characteristics of Solid Propellants 


Vol. 39,  No. 5, pp. 1-8, Oct.  2024
10.14341/JKOSOS.2024.39.5.1


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  Abstract

In this study, a dynamic mechanical analysis (DMA)-based small specimen testing method was proposed to minimize the sample quantity and measurement time of solid propellants, and its effectiveness was experimentally validated. A newly designed and fabricated specimen-jig integrated system was used to achieve the reduction in sample quantity and measurement time. Precise tensile deformation was applied to the fabricated ultra-small specimens with dimensions of 6 × 2 × 14 mm３, and their stress relaxation behavior was measured for 10 min at four different temperatures: -30, 0, 25, and 50 ℃. The stress relaxation behavior observed using the DMA method indicated strong agreement with conventional UTM test results, with both methods exhibiting a similar trend in stress reduction rate. Additionally, the DMA method demonstrated superior reproducibility in stress relaxation measurements compared to the UTM. The proposed DMA test method, using ultra-small specimens, can effectively replace the existing UTM test method for evaluating the stress relaxation characteristics of solid propellants. This approach can also reduce the exposure of evaluators to hazardous environments and help prevent safety accidents.

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  Cite this article

[IEEE Style]

김영현, 정민주, 오대산, "A Study on Improvement of DMA-based Small Specimen Measurement Method for Evaluating Stress Relaxation Characteristics of Solid Propellants," Journal of the Korean Society of Safety, vol. 39, no. 5, pp. 1-8, 2024. DOI: 10.14341/JKOSOS.2024.39.5.1.

[ACM Style]

김영현, 정민주, and 오대산. 2024. A Study on Improvement of DMA-based Small Specimen Measurement Method for Evaluating Stress Relaxation Characteristics of Solid Propellants. Journal of the Korean Society of Safety, 39, 5, (2024), 1-8. DOI: 10.14341/JKOSOS.2024.39.5.1.

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