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- W2321682283 abstract "Results that illustrate the use of a video-image-correlation-based displacement and strain measurement system to study the fracture behavior of the sprayed-on foam insulation (SOFI) used for the thermal protection system on the Space Shuttle External Tank are presented. Standard fracture specimens for the SOFI material were tested and included the Compact Tension specimen and the Middle-Crack Tension specimen. Based on the limited data from this study, it is not conclusive as to whether linear elastic fracture mechanics (LEFM) is applicable for this material at room temperature. In particular, the specimen configurations considered herein appear to meet some of the LEFM criteria in regard to the linearity of the CMOD response and the C(T) and M(T) specimens with similar material orientations develop similar stress intensity factors. However, other crack‐length-tospecimen‐width ratios need to be investigated to fully verify these results. In addition, the yield zones near the crack tip, assumed to be regions associated with strains that exceed 0.02, appear to be large and changes shape and size when the crack is subjected to combined tension and shear. Thus, there is some question as to whether the LEFM results would be scalable because of the large amounts of material yielding that occurs in these specimens. The nonuniformities in the microstructure, e.g., voids, elongated cells, and localized density changes inherent in the SOFI materials, did not appear to significantly affect the fracture behavior of the particular specimens presented herein." @default.
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- W2321682283 date "2006-05-01" @default.
- W2321682283 modified "2023-09-25" @default.
- W2321682283 title "Fracture Characterization of a Closed-Cell Foam Material Using a Full-Field Displacement and Strain Measurement Technique" @default.
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- W2321682283 doi "https://doi.org/10.2514/6.2006-2200" @default.
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