Based on the shear wave tracing(SWT) technique proposed by Tang Z P, particle velocity gauge and the dual internal measurement for pressure and shear waves (IMPS) system are applied to investigate the responses of fib...Based on the shear wave tracing(SWT) technique proposed by Tang Z P, particle velocity gauge and the dual internal measurement for pressure and shear waves (IMPS) system are applied to investigate the responses of fiber reinforced cement subjected to impact loading. Series of experiments are conducted. The results show that there exist four critical points, A, B, C, D, in p-V Hugoniot curves. They correspond to the Hugoniot elastic limit (HEL) of the material, the critical point for shear strength limit and transition from damage state to failure state, void collapse, and solid compression, respectively. The critical point B is difficult to be aware of and never reported. However, it can be clearly disclosed with SWT method. Based on the analyses of shear strength, it can be concluded that the transversal wave, especially the unloading transversal wave, is especially important for the dynamic damage investigation of brittle materials.展开更多
1 Introduction The phenomena of laser-induced spall in metals have been reported in only a few papers, and most work was concentrated on aluminum and copper. Since the pulse intense laser can generate ultra-high strai...1 Introduction The phenomena of laser-induced spall in metals have been reported in only a few papers, and most work was concentrated on aluminum and copper. Since the pulse intense laser can generate ultra-high strain rates more than 10<sup>7</sup> s<sup>-1</sup>, it becomes almost the unique means in laboratories for investigation of fracture behavior and mechanisms of materials under such extreme conditions. In this note, the preliminary results of spall展开更多
文摘Based on the shear wave tracing(SWT) technique proposed by Tang Z P, particle velocity gauge and the dual internal measurement for pressure and shear waves (IMPS) system are applied to investigate the responses of fiber reinforced cement subjected to impact loading. Series of experiments are conducted. The results show that there exist four critical points, A, B, C, D, in p-V Hugoniot curves. They correspond to the Hugoniot elastic limit (HEL) of the material, the critical point for shear strength limit and transition from damage state to failure state, void collapse, and solid compression, respectively. The critical point B is difficult to be aware of and never reported. However, it can be clearly disclosed with SWT method. Based on the analyses of shear strength, it can be concluded that the transversal wave, especially the unloading transversal wave, is especially important for the dynamic damage investigation of brittle materials.
基金Project supported by the Laser Technology Area, the National High Technology Project.
文摘1 Introduction The phenomena of laser-induced spall in metals have been reported in only a few papers, and most work was concentrated on aluminum and copper. Since the pulse intense laser can generate ultra-high strain rates more than 10<sup>7</sup> s<sup>-1</sup>, it becomes almost the unique means in laboratories for investigation of fracture behavior and mechanisms of materials under such extreme conditions. In this note, the preliminary results of spall
