Damage tolerance design procedures for an automotive composite

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Among the durability issues of concern in the use of composites in automobile structures is the damaging effects that low-energy impacts (e.g., tool drops and roadway kickups) might have on strength and stiffness. This issue was experimentally investigated, and recommended design evaluation procedures were developed for a candidate automotive structural composite--a structural reaction injection-molded polyurethane reinforced with continuous strand, swirl-mat E-glass fibers. Two test facilities were built to cover the range of impacts of interest--a pendulum device to characterize the effects of relative heavy objects at low velocities and an air gun to characterize the effects of relatively light objects ... continued below

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8 p.

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Corum, J. M. & Battiste, R. L. November 1, 1998.

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Description

Among the durability issues of concern in the use of composites in automobile structures is the damaging effects that low-energy impacts (e.g., tool drops and roadway kickups) might have on strength and stiffness. This issue was experimentally investigated, and recommended design evaluation procedures were developed for a candidate automotive structural composite--a structural reaction injection-molded polyurethane reinforced with continuous strand, swirl-mat E-glass fibers. Two test facilities were built to cover the range of impacts of interest--a pendulum device to characterize the effects of relative heavy objects at low velocities and an air gun to characterize the effects of relatively light objects at higher velocities. In all cases, the test specimen was a 9 x 9 x 1/8-in.-thick plate clamped on an 8-in.-diam circle. Sixty-five impact tests were performed. Included were tests using various impactor sizes and weights, tests at {minus}40 F, and tests on specimens that has been presoaked in water or exposed to battery acid. Damage areas were determined using ultrasonic C-scans, and the resulting areas were found to correlate with the quantity impactor mass to a power times velocity. A design curve was derived from the correlation and validated using dropped brick tests. To evaluate strength and stiffness reductions, the impacted plate specimens were cut into tensile, compressive, and fatigue test specimens that were used to determine reductions as a function of damage area. It was found that for design purposes, the strength reduction could be determined by representing the damage area by a circular hole of equivalent area.

Physical Description

8 p.

Notes

OSTI as DE99000210

Source

  • 13. annual ESD advanced composite technology conference and exposition, Detroit, MI (United States), 28-29 Sep 1998

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  • Other: DE99000210
  • Report No.: ORNL/CP--99201
  • Report No.: CONF-980943--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/676890 | External Link
  • Office of Scientific & Technical Information Report Number: 676890
  • Archival Resource Key: ark:/67531/metadc711644

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Office of Scientific & Technical Information Technical Reports

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  • November 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Sept. 1, 2016, 1:37 p.m.

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Corum, J. M. & Battiste, R. L. Damage tolerance design procedures for an automotive composite, report, November 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc711644/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.