论文部分内容阅读
利用57 mm口径一级轻气炮,飞片选用有机玻璃,对密度1.8 g/cm3、饱和度22%的重塑黄土,进行了一系列一维应变实验。通过在重塑黄土试样内布设多根Π形电磁粒子速度计,直接测得了多个粒子速度波形。该文详细介绍了一维应变条件下Lagrange分析方法的理论推导及求解过程,并对实测粒子速度波形进行了Lagrange分析,得到了加、卸载全过程的应力、应变波形。给出了3发不同压力条件下重塑黄土的应力-应变关系曲线,揭示了重塑黄土介质的本构滞回效应。并使用该应力-应变关系对试样内应力波传播过程进行了反分析,最后对Lagrange分析过程中遇到的问题进行了讨论。
A 57 mm caliber light gas cannon was used. A series of one-dimensional strain experiments were carried out on the remolded loess with a density of 1.8 g / cm3 and a saturation of 22% using organic glass. Multiple particle velocity waveforms were measured directly by arranging a plurality of Π-shaped electromagnetic particle velocity meters in the remolded loess sample. In this paper, the theoretical derivation and solving process of Lagrange analysis method under one-dimensional strain condition are introduced in detail. Lagrange analysis of measured particle velocity waveforms is carried out, and the stress and strain waveforms of the entire process of loading and unloading are obtained. The stress-strain curves of the remolded loess under three different pressures are given, and the constitutive hysterisis of the remolded loess medium is revealed. The stress-strain relationship was used to inversely analyze the stress wave propagation in the specimen. Finally, the problems encountered in the Lagrange analysis were discussed.