ABSTRACT

The characteristics of hydrostatic stress conditions are discussed and compared with real experimental observations made under high pressure with a diamond-anvil cell. While fluid pressure-transmitting media give a well-defined single stress condition, solid pressure-transmitting media give a variety of stress conditions within the limit of their shear strength under high pressure. Owing to its low shear strength, solid helium would be the best choice for a pressure-transmitting medium to at least 100 GPa. However, helium is so compressible that care should be taken on minimizing irregular deformation of a gasket hole, which often causes complicated stress states. A review is given on the quasi-hydrostatic limits of solidified pressure-transmitting media, and some ways to reduce nonhydrostaticity are discussed including the case of low-temperature experiments.

摘要

讨论了静水应力条件的特征，并与在高压下使用金刚石砧座进行的实际实验观察进行了比较。流体压力传输介质给出了明确定义的单一应力条件，而固体压力传输介质在高压下的剪切强度范围内给出了各种应力条件。由于其低剪切强度，固体氦将是压力传输介质的最佳选择，至少为 100 GPa。然而，氦气的可压缩性如此之大，因此应注意尽量减少垫圈孔的不规则变形，这通常会导致复杂的应力状态。综述了固化传压介质的准流体静力学极限，