Shock response of a gamma titanium aluminide

Abstract

TiAl alloys in aerospace and other structural applications require knowledge of their impact behavior for better evaluation and modeling. In the present study plate impact experiments are conducted using a single-stage gas gun to better understand the shock behavior of the recently developed class of gamma titanium aluminide alloys-the Gamma-Met PX. The Gamma-Met PX showed superior shock properties when compared to the conventional titanium aluminide alloys. The spall strength of Gamma-Met PX is 1.8Ϯ 0.09 GPa, which is four to six times higher than those reported for other gamma titanium aluminide alloys. Moreover, it has a Hugoniot elastic limit of 1.88 GPa at a target thickness of 3.86 mm, which drops to 1.15 GPa at target thickness of 15.8 mm. The decay in the elastic precursor is continuous without showing an asymptote to a constant level within the range of target thicknesses studied.

Estimating Void Nucleation Statistics in Laser-Driven Spall

“…The velocity corresponding to the "Residual Stress" is denoted by U residual . This velocity approaches U max in over-driven spall experiments, where the magnitude and duration of the tensile stresses nucleates and grows failure mechanisms to full coalescence in the spall plane [28]. In the case of the limited nucleation and growth of failure mechanisms due to the short shock duration and lower shock stress imposed by the laser-driven experiment in this work, there is a residual stress in the spall plane corresponding to Eq.…”

Plate impact experiments to investigate shock-induced inelasticity in Westerly granite

“…In view of this, and during the time interval of interest, the flyer and target plates can be considered to be essentially infinite in their spatial dimensions and onedimensional wave theory is used in the interpretation of the experimental results. Other details regarding the experimental configuration and execution of the experiments can be found elsewhere [15][16][17]. The schematic of the t-X (time vs. distance) diagram, which illustrates the propagation of compression and tensile waves through the target and flyer plates during a typical plate-impact spall experiment, is shown in Fig.…”