Compared to a quasistatic environment,the electromechanical response of piezoelectric ceramics exhibits a considerably nonlinear behavior when subjected to impact.If the effect of ambient temperature is further consid...Compared to a quasistatic environment,the electromechanical response of piezoelectric ceramics exhibits a considerably nonlinear behavior when subjected to impact.If the effect of ambient temperature is further considered,then the situation becomes more unpredictable.The thermal,mechanical,and electrical properties of soft-doped piezoelectric ceramics(PZT-5H)under compression and impact conditions were analyzed in the temperature range of-60℃to 200℃(below Curie temperature).The experimental results indicate that the fracture strength of PZT-5H has an extreme value near room temperature.The dynamic piezoelectric coefficient is strongly temperature dependent and has a maximum value near 100℃because of the“electric devil's staircase effect”between polarization and domain switching threshold.These temperature-dependent data will enable the accurate prediction of the dynamic performance of devices by computer simulation.展开更多
An experimental system has been built to produce and measure the magnetic field in the backward ejected matter during hypervelocity impact.The designs of measurement system and coil,the choice of associated equipment,...An experimental system has been built to produce and measure the magnetic field in the backward ejected matter during hypervelocity impact.The designs of measurement system and coil,the choice of associated equipment,and the system calibration are also described in detail.The measurement of magnetic induction intensity for different given coil positions and azimuth angles are performed with two-stage light-gas gun.On condition that impact velocities are approximately equal and incidence angles are 45°,60° and 90° respectively,the relationship between average magnetic induction intensity and impact angle at different time spans is obtained.Experimental results show that the average magnetic induction intensity with incidence angle of 90° is larger than those with incidence angles of 45°and 60°.展开更多
基金supported by the National Natural Science Foundation of China (Grant No.12172232)the scientific research support plan for high-level talents introduced by Shenyang Ligong University。
文摘Compared to a quasistatic environment,the electromechanical response of piezoelectric ceramics exhibits a considerably nonlinear behavior when subjected to impact.If the effect of ambient temperature is further considered,then the situation becomes more unpredictable.The thermal,mechanical,and electrical properties of soft-doped piezoelectric ceramics(PZT-5H)under compression and impact conditions were analyzed in the temperature range of-60℃to 200℃(below Curie temperature).The experimental results indicate that the fracture strength of PZT-5H has an extreme value near room temperature.The dynamic piezoelectric coefficient is strongly temperature dependent and has a maximum value near 100℃because of the“electric devil's staircase effect”between polarization and domain switching threshold.These temperature-dependent data will enable the accurate prediction of the dynamic performance of devices by computer simulation.
基金National Natural Science Foundation of China (10772028)Talent Resources Development Special Funds of Shenyang (20081400103009)Doctoral Initiation Special Fund of Shenyang Ligong University
文摘An experimental system has been built to produce and measure the magnetic field in the backward ejected matter during hypervelocity impact.The designs of measurement system and coil,the choice of associated equipment,and the system calibration are also described in detail.The measurement of magnetic induction intensity for different given coil positions and azimuth angles are performed with two-stage light-gas gun.On condition that impact velocities are approximately equal and incidence angles are 45°,60° and 90° respectively,the relationship between average magnetic induction intensity and impact angle at different time spans is obtained.Experimental results show that the average magnetic induction intensity with incidence angle of 90° is larger than those with incidence angles of 45°and 60°.
