To study the drag and the velocity change during projectil e penetrating into sand, the equivalent viscosity was proposed to depict the stress between the fluid layers during th e projectile penetrating into sand with highˉspeed.
为研究弹丸在高速穿透砂体过程中所受的阻力及其速度的变化规律，提出引入等效粘性来描述砂体在被弹丸高速穿透过程中流层之间的相互作用力。
Property characteristic of foam Al-alloys of penetrating casting around granules was studied. Mechanical properties, fluid permeability, acoustical properties, heat conductivity and damping capacity were tested by testing methods and testing units that we design.
研究渗流铸造泡沫铝合金的性能特点，自行设计测试方法和制造测试装置，测试了泡沫铝合金的力学性能、流体透过性能、声学性能、热传导性能和阻尼性能。
The coal deformation, density and fluid penetrating regularity in multi-fractures are the key problems in gas-rich coal development.
煤岩体变形和强度以及流体在多孔隙裂隙煤中的渗流规律，是高瓦斯煤层开采中关注的问题。
Long-distance trendy change of fluid items of new No. 04 well results from strengthening of regional stress field and increasing of penetrating flux of shallow-layer water.
新04井（泉）流体测项长程趋势变化是由于区域应力场增强与浅层水渗入量增加共同作用的结果。