微裂纹

The stable growth of cracks in a brittle materialwith three mutually perpendicular families of cracks under proportional tensile loadsin the three principal directions is studied.

研究了含三相正交分布微裂纹的准脆性材料在三个主应力方向比例加载下的稳定扩展的规律。

The micro crack behavior in ice is the key factor for describing and explaining ice-induced self-excited vibration.

冰内部的微裂纹行为是解释与描述冰致自激振动的关键要素。

With air-formed films the faradaic processes decreased progressively to a constant rate consistant with the increase in potential, indicating the healing of surface flaws.

对于空气氧化膜，电化学反应速度逐步变慢，直至达到相应于稳定钝态的恒定值，同时电位向正移动，表明膜中的微裂纹不断得到修补。

During the first 10 hours the initial film dissolution was accompanied by a decrease in potential with an apparent plugging of flaws. However, after about 20 hours, the anodic film thickness decreased sufficiently to allow the faradaic processes toinerease to, the final steady state value.

开始时氧化膜比较厚，电化学反应主要局限在微裂纹内，由于阴极反应受抑止，电位变负；随着氧化膜减薄，电位变正，电化学反应速度加快，最后进入稳定钝态。

Based on linear elastic fracture theory, a damage evolution equation for composite soild propellant under uniaxial tension is derived. Main mecrosopic of material are determined through fittin the experiment data of constant rate tension. Then, the integrate constitutive equations found is close to microlevel.

基于线弹性断裂理论，提出了一个适合复合固体推进剂的脱湿微裂纹损伤发展方程，通过部分单向定速拉伸试验数据拟合确定其主要的细观参数，从而得到了复合固体推进剂在细观水平上完整且封闭的本构方程组。

The microstructure and thermal physical properties of the surface reactional layer determine the range of strength improvement.Stress relaxation was benifical for strength,but the oxidation-induced bubbles and crack weaken the specimens.

热处理引起的应力松弛也有利于材料强度的提高，但氧化过程中产生的表面气孔及冷却过程中产生的表面微裂纹会引起材料强度的下降。

Under triaxial compressive conditions, with an increase of loading, the propagation and sliding of microcracks in rocklike materials become increasingly intense and lead to a serial of consequences, such as nonlinear stress-strain relationships, deterioration of elastic modulus, anisotropic deformation, volumetric dilatancy and irreversible plastic strain, etc..

三维压缩条件下，随着载荷的逐渐增加，岩石类材料内部微裂纹的传播与错动不断加剧，最终导致非线性应力－应变关系、弹性模量的减小、变形的各向异性、体积膨胀以及不可逆塑性变形等结果。

The effect of hydrogen on the change from ductile to brittle is to prevent nanocracks in DFZs from blunting into voids.

即氢使奥氏体不锈钢由韧变脆的根本原因是氢抑制了DFZ中纳米级微裂纹向空洞的转化。

The slip steps are produced on the slip lines by the interaction of the multi-slip. The direct reason of the creep fracture is that the rafted γ'phase is twisted and the micro-cracks are emerged in alloy due to the continuous cross-slips.

降低了台金的蠕变抗力两个滑移系统交割产生滑移台阶，连续的交替滑移使筏状γ'相发生扭曲、并产生微裂纹是蠕变断裂的直接原因

From the visual angle of mechanics,bone remodelling plays an important role in adapting to load environment and repairing microcracks.

从力学角度讲，骨重建的作用一是适应力学环境，二是修复微裂纹。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。