Strain Rate Sensitivity and Crash Modeling of High Strength Steels
 

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Crash Experiments


Circular Tube Crush Tests, TMAC [+]
Dynamic axial compression tests have been conducted on circular tube specimens using the intermediate strain rate servo-hydraulic test machine. These tests are conducted on different AISI material grades: DQSK (1.6mm), HSLA340 (1.6 mm), DP590 (1.6 mm), DP780 (1.2 mm), BH300 (1.6 mm), TRIP600 (1.6 mm), TRIP780 (1.6 mm), 440WGA (1.2 mm) and DP780 HDGI Steel (1.2 mm). For each of these materials, nine tests were run, corresponding to three replicates at three different test velocities. In each case, minimum two out of the three replicates were instrumented with a maximum of sixteen strain gages in locations of crush fold formation. The inner diameter (100 mm) and the height (180 mm) of all the tubes were the same for all material grades to allow for comparison and common tube fixturing. [+]


Octagonal Tube Crush Tests, TMAC [+]
In support of developing standard test methods for characterizing the behavior of sheet metal at high strain rates, dynamic axial compression tests were conducted on octagonal tube specimens using the intermediate strain rate servo-hydraulic test machine. The tests were conducted on three different AISI material grades: DP590 (t=1.6mm, GI coating), DP780 (t=1.2mm, GA coating), HSLA340 (1.6mm, GA coating). For each of these materials, nine tests were run, corresponding to three replicates at three different test velocities (0.06 m/s, 0.6 m/s and 6 m/s). In each case, two out of the three replicates were instrumented with a maximum of nine strain gages. The geometry of all the tubes were the same for all material grades to allow for comparison and common tube fixturing. [+]


Spotweld Tests, Drop Tower [+]

Download PDF version of the spot weld test report.

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Base Material Tests, High Speed Hydraulics [+]
In support of the Auto/Steel Partnership (A/S-P), Strain Rate Characterization Project, ORNL we have conducted high rate experimental tensile tests and analysis of base materials. The objective of the test program is to provide the necessary experimental data in support of the A/S-P efforts to determine high-strain-rate mechanical properties of Advanced High Strength Steels (AHSS). The experiments and data also enable better predictive modeling of base materials for finite element crash modeling. The test program consists of testing tensile specimens under strain rates of quasi-static, 0.1/s, 1/s, 10/s, 100/s, and maximum strain rates achievable in full open loop configuration. The tests were conducted on the new hydraulic test equipment at the Oak Ridge National Laboratory. All the tests have been conducted using the same apparatus. If an effective gage length for the chosen specimen is known the equipment can be programmed to run non-linear velocities in the drive file to achieve global strain control (engineering or true strain rate as desired). High-speed video recording provide detailed record of the test as well as displacement data for strain measurements. [+]


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