失稳

The result shows that the main reasons of deformation failures in deep roadways are 1 highly relying on the piling up of several support styles, and 2 ignoring the coupling between support and surrounding rock or the couplings among different supports. This is because massive deformation energy is accumulated in surrounding rock, which is induced by high stress and soft rock dilatability.

结果表明，在深部高地应力及软岩膨胀性作用力的影响下，巷道围岩内部积聚了大量的变形能量，单纯依靠多种支护形式的叠加，而不注重支护体与围岩之间以及支护体之间的耦合是巷道失稳的主要原因。

The process of rock mass' evolution to instability is a course of energy dissipation with entropy decreasing gradually.

岩体向失稳方向的演化过程是一个能量耗散且伴随有减熵的过程。

The bigger top tension will cause the wellhead to be over-pulled and increase the probability of wellhead collapse. As the mean drifting of drilling vessel or platform increases, the wellhead displacement and bending moment nearly linear enlarges. The greater current velocity may result in wellhead instability because of its limited bearing moment capacity. Therefore the drifting control is very important to subsea wellhead stability. The wellhead stability may be improved by taking measures such as enhancing the conductor bending strength, controlling scour depth on seabed, getting geological data sampling of shallow formations.

算例分析表明，水下井口的横向偏移及弯矩随张力比和海流流速的增加而大幅增大，顶张力过大会引起井口稳定性变差；随着钻井船或平台漂移量的增加，井口的横向偏移和弯矩近似线性增加，控制好钻井船或平台的漂移非常重要；由于井口承受弯矩的能力有限，较大海流流速情况下可能造成井口失稳；提高导管抗弯强度、控制泥线处管柱冲刷、获取浅部地层的取样数据等措施可以增强井口稳定性。

What's more, the geological conditions are very complex, so several unstability patterns such as shear in the soft rock, dumpage and slide on the structural plane are very possible to occur.

另外该高陡岩质边坡的地质条件又复杂，因此可能发生座滑、倾倒、滑移等多种失稳形式。

The safety factor obtained with the relationship between elastic strain energy and the reduction coefficient is similar to that obtained by other traditional slope steady analyzed method.

摘 要：为分析采用强度折减法确定边坡安全系数过程中边坡弹性应变能随折减系数变化与边坡失稳破坏的内在联系，建立数值模型，记录边坡弹性应变能与折减系数关系曲线；通过对某边坡的分析，绘制弹性应变能与折减系数关系曲线。

Near rated point, the equivalent length may be 1.4 times of the designed length, while in some abnormal states, the equivalent length may be 2 times of that.

在额定点附近，等效气隙长度达到设计值的1.4倍，而在临界失稳工况下，等效气隙长度达到后者的2倍以上。

The variation of flow stress as a function of deformation temperature and strain rate can be described as an exponential expression.A processing map is developed on the basis of hot compressing data and by using the principles of dynamic materia...

实验结果表明在试验参数范围内存在三个特征区域：一个加工安全区：动态再结晶区；一个加工失稳区和一个不适合热加工的低耗散效率区，并根据热加工图对 GH4648合金的热变形工艺进行了初步设计。

The corresponding double-$K$ fracture parameters (initial cracking roughness $K_{\rm IC}^{\rm ini}$and unstable fracture toughness $K_{\rm IC}^{\rm un})$ introduced in the criterion are determined using a simple experiment method combing with an analytical evaluation based on the cohesive force on the fictitious crack zone.

其相应的双$K$断裂参数(起裂断裂韧度$K_{\rm IC}^{\rm ini}$和失稳断裂韧度$K_{\rm IC}^{\rm un}$)一般通过简便的试验和基于虚拟裂缝扩展粘聚力的解析方法确定。

The results show that dynamical ductil-ity dominated final velocity of fragments. During tube expansion, the shear fracture appears preferentially a-long the adiabatic shear bands under positive stress, so the adiabatic shear band determines the size and shapeof fragments. Though the fragmentation behaviour of medium carbon Si - Mn bainific steel is close to that ofsteel 50SiMnVB, medium carbon Si - Mn bainitic steel is an ideal candidate material for the tubular bombs be-cause it is better in dynamical ductility, which can enable the tubes to gain high speeds before fragmentation.

结果表明：材料动态塑性是决定破片最终速度的主要因素；圆管膨胀时外表面形成以剪切为主的裂纹，并向内扩展，接近内表面的绝热剪切带伴随着圆管的膨胀而扩展，并未出现失稳现象，但在正应力的作用下成为优先的断裂通道、决定破片的尺寸和形态；中碳Si-Mn贝氏体钢与50SiMnVB钢的破碎性能相近，但贝氏体钢动态塑性很更好，破碎前的膨胀量较大、更有利于提高破片初速，是弹箭比较理想的候选材料。

Then,the first order second moment theory in structural reliability analysis,i.e.,the checking point method was introduced to compute the two failure modes respectively,and two corresponding reliability i...

将两种失稳模式视为串联系统，由逐步等效平面法计算结构体系可靠度指标，最后由结构体系可靠度指标计算出该挡土墙稳定性的结构体系失效概率。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。