United States Department of Transportation
i
Full-Scale Shell Impact of a DOT-105 Tank Car
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2018-04-01
[PDF-1.30 MB]
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TRIS Online Accession Number:01667886
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NTL Classification:NTL-ENERGY AND ENVIRONMENT-Hazardous Materials Transportation
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Abstract:On April 27, 2016, the Federal Railroad Administration (FRA) conducted a full-scale shell impact test of a DOT105A500W (DOT-105) tank car at the Transportation Technology Center (TTC) in Pueblo, CO. The shell of the car was struck at its mid-length by a 297,000 pound ram car equipped with a 12-inch by 12-inch impactor. The objective of this test was to generate data that could be used to validate results from finite element (FE) simulations of the same test. The data, photos, and videos from this test will be made public to facilitate their use in future model validation activities. The test tank car was filled to 9.4% of its capacity with water and pressurized to 100 psi, which is typical for this type of car in service. The target test speed, based on pre-test FE analysis (FEA), was 15 mph. The actual impact occurred at 15.16 mph. This speed corresponds to an impact of approximately 2.25 million foot-pounds of energy. After an indentation of approximately 38 inches, the tank was punctured at a peak force of approximately 1.4 million pounds. The impact vehicle and the tank itself rebounded from the impact wall after the test, leaving approximately a 30 inch gap between the wall and the back of the tank. A review of the test measurements indicates that the impactor had slowed to less than 1 mph when puncture occurred, demonstrating that the impact speed of 15.16 mph only slightly exceeded the speed necessary to puncture this car. Pre-test FEA was performed with two different stress-strain responses, without knowing the exact material properties for this car. Pre-test modeling, which was conducted with a material that slightly exceeded the ductility requirement of TC128B, indicated that a puncture was likely to occur at a speed of 14.5 mph, while FEA with a material that greatly exceeded the ductility requirement of specification TC128B indicated puncture was likely to occur at a speed of approximately 17 mph.
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