Publications

Four tensile coupon designs of PH13-8Mo H950 steel were tested to failure using quasi-static rates to obtain data to calibrate the Xue-Wierzbicki failure model for ductile fracture. The tests recorded the force-displacement, location of the first crack, displacement to fracture, area reduction, and crack propagation path. The test method and coupon designs were adopted from Tomasz Wierzbicki’s “Calibration and evaluation of seven fracture models” report. The XueWierzbicki model predicts fracture based on accumulated equivalent plastic strain, stress triaxiality, and deviatoric state parameter. Calibrating the Xue-Wierzbicki failure model required testing four coupon designs to calculate the four free parameters in the model. The coupon designs tested a range of stress triaxialities with two axisymmetric tests, one shear test, and one plane stress test. The data obtained and presented in this report can be used to develop a Xue-Wierzbicki fracture model for PH13-8Mo H950 steel.

To determine the in-plane crush properties of a perforated aluminum and Kevlar^® layered composite, confined compression tests were performed. Cylindrical samples were used in the test. The samples were cut by waterjet from bulk material. The tests were conducted in the geomechanics laboratory at Sandia National Laboratories. Force and displacement data were recorded to determine the stress versus volumetric strain up to full compaction of the material. Full compaction was determined to be when the displacement was negligible or when the material had compacted about 63 percent in volume, which was the open volume percent of the aluminum layers in the uncompressed specimens. This testing is intended to capture data for use in the structural models used in support of the certification of the AWG-711 hazardous materials air transportation package.