滑动摩擦

Realized the limitation of current model, a general finite element model was proposed to determine the main crack propagation, local fracture of fiber and matrix and dynamic friction.

认识到了该模型的局限性，进一步给出了分别确定主裂纹扩展，局部纤维和基体破坏和滑动摩擦的有限元一般模型。

We all know that roller, block between hobber and hobber for the imprint, but the artificial division between rolling roller, block roller and embossing roll is a compact, linear three-roll and is consistent, so when the pressure is too large, due to the printing plate is compressed with the roller between a certain amount of sliding friction, thereby allowing the printing plate abrasive.

不小家都懂得，网纹辊、印版滚与不抬印滚之间虽说是滚不抬，但是网纹辊、印版辊与不抬印辊是有不抬缩的，而不一辊的线速量又是分歧的，所以当不弛力过不小时，由于印版被不抬缩会与网纹辊之间爆发必定的滑动摩擦，从而使印版爆发磨损。

The main results of the investigation are as following:(1) Some important criteria for the design of multi-layer structure are acquired: the ratio of the layer thickness to the contact diameter should be controlled to a value about 0.8; increasing the number of the gradient layers and elasticity modulus of the top layer would benefit to the yield strength and the stress status at the interface.（2）By means of molecular dynamics simulations for a indentation and sliding process, it is discovered that dislocations of 45 direction to the surface occur in the surfaces layer, which is correspond to the direction of the plastic flows observed in the macroscopic continuous medium. The irreversible deformation caused by the dislocation and the atom piles at the surface are responsible for the irreversibility of the force response. They are also the main factors for the friction generation. The temperature and the indentation velocity have significant effects on the deformation behaviors of the material of the surface layer. The yield strength would increase obviously if the indentation velocity is greater than 10 m/s.（3）A method to evaluate the fracture toughness of coating by estimating the crack-density functionβof a Wicker''s indentation was proposed. Meanwhile a new surface treatment technology was developed using non-equilibrium plasma.（4）A MD-FE hybrid method and corresponding software was developed to analysis the tribological behaviors for multiplayer system.

研究主要内容和结果有：（1）得到指导梯度膜设计的几个准则：控制膜层厚度与接触半径比在0.8左右为宜；适当增加梯度层层数和顶层弹性模量，有利于提高抗屈服能力和改善界面处的应力状态；（2）通过对嵌入和滑动摩擦过程的分子动力学模拟，发现表层产生一个与宏观连续介质的塑性流动方向观测一致的45 方向位错；位错造成的不可逆变形和表面的原子堆积，是力的响应不可逆性的原因，也是构成摩擦力的主要因素；温度和嵌入速度对材料变形特性有显著的影响，当嵌入速度大于10 m/s时，屈服强度明显增加；（3）提出压痕裂纹密度系数β半定量判定膜层断裂韧性的方法；并开发出表面强化新工艺；（4）开发出分析表面摩擦学特性的MD-FE复合模拟方法和相应模拟软件。

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。

The result shows the tribology properties are good, the kinetic friction coefficient are under 0.1. In the same conditions of wearing test, the weight loss of surface treated with EDC is about one tenth of the weight loss without treatment, and is about one sixth of the weight loss treated with electroless composite coating.

结果表明：在本试验的条件下，涂层的滑动摩擦系数较小，均在0.1以下，说明涂层的摩擦学性能较好；在相同的磨损实验条件下，用液中放电沉积方法处理过的表面磨损失重量是未处理表面的1/10左右，是化学复合镀方法处理表面的1/6左右，说明涂层的耐磨性相对较好。

The tribological behavior of the network ceramic reinforced aluminum matrix composite was studied in dry sliding conditions of wear, and a wear model was established based on the experimental results.

研究了网络陶瓷增强铝基复合材料在干滑动摩擦条件下的磨损行为，并在试验的基础上建立了复合材料的磨损模型。

A new nonreversible friction model is presented for sliding regime to describe friction memory effect.

同时还提出了一个新的不可逆宏观滑动摩擦模型。

It is pointed out that the friction coefficients have the influence on the shapes of trajectories of the systems in phase plane.

指出滑动摩擦系数影响相平面上的轨线，使之呈现了不同的形态。

It involves a simple mechanical principle: sliding friction, rolling friction small.

它涉及一个简单的机械原理：滑动摩擦大、滚动摩擦小。

It involves a simple mechanical principle: a large sliding friction, rolling friction small.

它涉及一个简单的机械原理：滑动摩擦大、滚动摩擦小。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。