查询词典 threshold friction

To apply the friction spinning method in the medium or fine count range is one of the main targets of the research on friction spinning method at home and abroad.

将摩擦纺纱法引入细支纱领域，一直是国内外摩擦纺纱研究的主要目标之一。

In order to interpret the impact from different intensity of friction factors on urban development, a new model is developed by adding incidental cost and friction factors to the traditional Thunen Model.

为此，传统的杜能模型需要进行扩展，在原始模型的基础上加入偶然成本以及影响城市扩展的摩擦因子以对其进行完善，以便解释摩擦因子的不同强度对城市扩展的不同影响。

The protective film decreased the surface roughness, and also increaser the friction coefficient in the process BTA absorbed on SiO2 polishing particle surfaces, which decreased the friction coefficient in the polishing process caused by the particles.

另外，BTA对成SiO2抛光磨粒具有一定的吸附作用，进而对抛光效果产生一定的影响，抛光磨粒表面吸附层的存在会减小抛光过程中的摩擦系数。

The stiffness, stress distribution and contact status under different friction coefficients were obtained, and the influence of interleaf friction coefficient on the stiffness and stress was studied.

在不考虑摩擦和考虑摩擦两种情况下计算其刚度、应力分布和接触情况，研究片间摩擦对钢板弹簧刚度和应力的影响。

The key to this yield criterion is that the concept of internal friction angle which used in soil mechanics has been introduced to infer the relationships among poisson ratio, internal friction angle and relative density.

并且在Miss屈服准则的基础上论证了粉末体屈服准则在主应力空间，为一个回转椭球体。

Four-node degenerated shell element and rigid shell element are used in our FEM model.Updated Lagrange formulation and rate form constitutive equation are adopted to solve the problem of large strain and large rotation in sheet forming process.Sheet metal material property is described by plastic anisotropy yielding model and isotropic hardening model.Master surface-slave surface contact model is used to define the contact between tools and blank.Contact constraints are enforced with a kinematic algorithm and friction stress is computed by Coulomb friction law.Dynamic relaxation method is used to treat springback after forming stroke.

四结点蜕化壳单元和刚体壳单元分别用来建立板和模具的有限元模型；更新Lagrange法和速率型本构关系被用来处理板料变形中的大应变和大转动；材料模型采用塑性各向异性屈服与等向强化模型；通过主从面模型定义板料和模具的接触，接触算法采用运动约束法，摩擦力用库仓定律计算；并利用动力松弛法对回弹过程进行了计算。

In chapter six, A finite element model to evaluate the mechanics properties of thin wall structure is put forwards. The 4-node quadrilateral Hughes-Liu shell element with five through-the-thickness integration points is employed. The material is assumed to satisfy the elastic-plastic yield condition with isotropic hardening. The single surface contact algorithm is taken to deal with the contact searching. The priori stabilization procedures for the numerical control of the hourglass instability and the penalty method for the evaluation of contact force are used. The classical Coulomb law of friction is employed to evaluate the friction force.

第六章采用法向方向5点积分的4节点Hughes-Liu壳单元，前置参数法砂漏控制技术，等向强化弹塑性材料模型，分步增量应力回映方法，一体化接触搜寻算法，罚参数接触力计算方法及经典摩擦定律，建立了一种计算受冲薄壁结构大变形力学特性计算的有限元模型，通过对汽车A传动轴及汽车纵向方形吸能梁的大变形力学特性分析，验证了该有限元模型的正确性。

The results of tests of friction and wear shows that the coefficient of kinetic friction of specimens is decreased by 64%～77%,and the wear rate of specimens is decreased by 22%～48%.

精密摩擦、磨损试验及显微硬度测量结果，试件表面的滑动摩擦系数降低了64%～77%；磨损率减少了22%～48%；显微硬度提高0.3～1.4倍。

For sliding contact, the coefficient of kinetic friction Uk is defined as the ratio of the friction al force to the normal force

滑动接触时，动摩擦系数Uk的定义是摩擦力与法向力的比率。

"Kinetic friction arises between surfaces in relative motion, static friction acts between surfaces at rest with respect to each other"

动摩擦力存在于相对运动之表面间，静摩擦则存在于静止的表面间，。

There are different types of personal loans available.

有许多不同类型的个人贷款优惠。

The above mentioned teaching model of spiral rising can be used to avoid rigidness in teaching.

上述螺旋式上升的教学模式，可以避免教学形成模式後的僵化现象。