In this article , the reason how the friction produces in the process of metal forming was analyzed , and the friction was thought to be mainly caused by the plastic flow of metal in the pits of tool surface 本文从微观入手对金属压力成型过程中摩擦的形成原因进行了分析，认为摩擦主要是由于被压入工具表面凹坑金属的塑性流动所引起的。
By adopting the sliding wear testing method , the wear behavior of no 45 steel testing pieces with different diameters and distribution densities of pits treated by laser were studied under temperatures of 200 and 400 摘要采用滑动磨损试验方法研究在200 、 400温度下，经激光处理后不同凹坑尺寸和分布密度的45钢试件的磨损性能。
In this article , the reason how the friction produces in the process of metal forming was analyzed , and the friction was thought to be mainly caused by the plastic flow of metal in the pits of tool surface 摘要本文从微观入手对金属压力成型过程中摩擦的形成原因进行了分析，认为摩擦主要是由于被压入工具表面凹坑金属的塑性流动所引起的。
The surfacial sediment on the yellow river delta is so sensitive to ocean hydrodynamic condition , especially waves that soil failed and came into being a lot of unstable features : bumps and hollows , flute and groove cast of silt and collapse 黄河三角洲潮滩浅表层沉积物由于对海洋动力尤其是波浪作用的敏感，会发生破坏，形成塌陷、凹坑、粉砂流冲沟等一系列灾害地质现象。
By means of orthogonal designing analysis shows that there are comparatively big influences on amount of wear affected by wearing time , diameters and distribution density of concave pits , and there are comparatively less influences on amount of wear affected by rotation speed and temperature 通过正交设计分析表明，磨损时间、凹坑直径和分布密度对磨损量的影响较大，转速及温度对磨损量的影响较小。
And then electroplate nickel - sealing with solid particulate , which is to make micro - crack chromium when electroplating chromium again , this can avoid unsmoothness , and slower corrosion speed , as a result , improve defence performanc e 再镀一层含有固体微粒的镍封，令到再镀铬时形成微孔铬，从而防止产生大而深的直贯基体金属的少量腐蚀沟纹和凹坑，向横向发展，减缓了穿透基体的腐蚀速度，进一步提高了防护性能。
The build - up welding of the meshing surfaces of big gear wheels : during operations of the big driving gears of big rolling mills and squeezers , the meshing surfaces wear easily and form cavities due to the squeezing force and attrition with the thinning of the gears resulting in the rejection of the gear wheels 大齿轮咬合面堆焊：大型轧机和压榨机的传动大齿轮在工作过程中，齿的咬合面产生大的挤压力和磨擦力易磨损和形成凹坑，齿厚减薄，因而报废。
Supporting roller 12 : it can be dismantled to be repaired if the surface of roller is abraded , or channel of rollers is abraded unequally , or there is sunken hole , make sure that the two roller channels should have same diameter and be coaxial , outer diameter of the pair supporting rollers of every driving roller should be similar 辊面磨损或辊道不均匀磨损或产生凹坑时可拆下精车修理，但注意辊体的二个辊道直径一致并同轴，每个传动辊的一对托辊外径保持一致。
Comparison between quasi - static indentation and low - velocity impact tests has been conducted in this paper at last . in accordance with energy balance principle , the dent depth vs . peak contact force under impact curve , which is derived from the dent depth vs . impact energy curve , is similar with the dent depth vs . indentation force curve with an evident transition 最后,本文还对低速冲击试验与静压痕试验做了比较分析,并基于能量平衡公式,从冲击能量凹坑深度关系导出了冲击最大接触力凹坑深度关系曲线,它与静压痕试验得出的压痕力凹坑深度曲线的变化趋势相类似,即出现较明显的拐点。
Therefore , interlayer toughened composites are the excellent candidate materials for primary structure of aircrafts . in this paper , composites modified with particle - interlayer were fabricated . based on the aims of improving compression strength after impact ( cai ) and evaluate damage resistance and damage tolerance , mode ii fracture toughness test and quasi - static indentation test ( qsi ) were conducted 本文采用层间颗粒增韧技术制备试验件，基于提高冲击后压缩强度( cai )和考察损伤阻抗、损伤容限的目的，试验测试了型层间断裂韧性g _ ( c ) 、准静压痕( qsi )试验的分层起始能量和接触力?凹坑深度关系。
