摘要
基于特征线反演法,开展了斜波加载实验的数据处理,对特征线反演法进行了数值验证和不确定度分析;并对磁驱动CQ-4装置上开展的准等熵压缩金属铝台阶靶实验的速度剖面进行了数据反演,通过原位粒子速度和材料声速,积分得到了包含弹-塑性转变过程的应力-应变曲线;此外,对不同反演方法得到的材料弹性屈服极限等进行了比较和分析,进一步论证了不依赖于本构模型的特征线反演分析在斜波加载实验数据处理中的重要性。
An inverse numerical method based on the characteristic curve was presented for better understanding of the mechanical behavior of materials under ramp loading.Numerical verification,uncertainties propagation and application of the inverse calculation were performed.From the measured velocity profiles of the stepped aluminum sample under the quasi-isentropic compression on the CQ-4 pulsed power facility,the wave propagation inside the sample was calculated using the inverse characteristic curve method and other methods.The calculated Lagrangian sound speed and the elastic limit of materials show that the inverse characteristic analysis can play a significant role in obtaining some key data of ramp loading experiments without having to rely on any constitutive model.
出处
《高压物理学报》
CAS
CSCD
北大核心
2016年第2期123-129,共7页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(11102193
11176002)
关键词
原位粒子速度
特征线
反演计算
准等熵压缩
in-situ particle velocity
characteristic curve
inverse calculation
quasi-isentropic compression
