【摘要】 采用PVDF压电测量技术,在“闪光Ⅱ号”脉冲电子束加速器上,进行了新型碳酚醛复合材料(C/PH)的热激波传播实验研究;利用波传播过程中的渐进近似理论所推导出的波传播衰减公式,对C/PH材料中的脉冲波衰减进行了理论分析.结果表明:在电子束能通量为312~531 J/cm2和电子平均能量为0.422~0.697 MeV条件下,对厚度为4 mm的碳酚醛靶而言,其热激波应力峰值为0.807~2.223 GPa;热激波在靶中的衰减与波的强度和脉冲宽度有关,对于强度相同的热激波,脉冲持续时间越短,热激波的衰减则越快;对于脉冲宽度一定的热激波,热激波的强度越高,则其衰减越快.实验结果和解析公式具有较好的一致性.更多还原

【Abstract】 Propagation and Attenuation of thermal shock wave in C/PH composite irradiated by pulsed electron beam were studied on "FLASH Ⅱ" accelerator.In experiments PVDF piezoelectric measuring technique was used.The equation obtained by the asymptotic weak-shock theory was used to analyse the attenuation rule of amplitude of thermal shock wave in C/PH.Experimental results show that when the energy fluxes of electron beam are in the range of 312 531 J/cm² and the mean energy of electron is in the range of 0.422⁰.697 MeV,the peak pressures at 4mm away from the irradiation surface of C/PH are in the range of 0.807 2.223 GPa,and that the attenuation of amplitude of thermal shock wave is related closely to the intensity and duration of the initial shock wave.The shorter the duration of the stress wave,the more rapid the attenuation for the same initial pressure;the larger the pressure,the more rapid the attenuation for the same initial duration of stress wave.Experimental results accord well with the analytical results.更多还原