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Simple Rating System for Identification of Failure-Critical Culverts and Small Structures.
| 题名： | Simple Rating System for Identification of Failure-Critical Culverts and Small Structures. |
| 作者： | Wissink-Katherine; McKee-Meghan; Houghtalen-Robert; Sutterer-Kevin |
| 关键词： | Brittleness-; Corrugated-pipe-culverts; Ductility-; Environment-; High-density-polyethylene-pipes; Stress-cracking; Temperature-; Testing- |
| 摘要： | Corrugated high-density polyethylene (HDPE) pipe 36 in. (900 mm) in diameter was evaluated for its stress crack resistance with the notched constant ligament stress test (ASTM F 2136). Test specimens were taken directly from the pipe liner to include the processing effects. In addition to the standard test condition of 10% Igepal solution at 50 deg C, tests were performed in water and air at temperatures of 60 deg, 70 deg, and 80 deg C. The test data were analyzed with the ISO 9080 method to define the transition point and ductile-to-brittle curve. The results indicate that the 10% Igepal solution greatly accelerates the stress cracking process, whereas the stress cracking behavior in water and in air is aggressive and practically the same. Activation energies in both ductile and brittle portions of the curve are in general agreement with the literature for HDPE resins. The results indicate that the rate processing method is an accurate model with which to extrapolate data from elevated test temperatures to lower service temperatures. However, Popelar‘s shift method tends to overestimate the failure times. |
| 总页数： | Transportation Research Record: Journal of the Transportation Research Board. 2005. (1928) pp221-225 (6 Fig., 2 Tab., 8 Ref.) |
| 报告类型： | 科技报告 |
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