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and experimental test. The results show that two typical contact pressure responses, called transient response and steady-state response, correspond to the galling zone: 0-10° and 30-50° at die radius respectively. Besides, the evaluation index Ry on the region of 0-10° and 30-50° at die radius is larger than the other zones after 200 bending times, which refers to the galling zone. The experimental......
and experiments. The results show that the prediction of galling zone by FEM-Archard wear model agrees with the experimental result. The wear depth on die surface is influenced by the die fillet radii and shape......
of rock fissure, numerical simulation calculation of plastic zone distribution and deformation monitoring of rock mass during undersea mining, the fractal evolution mechanisms of rock fracture... researches on the plastic zone distribution of undersea mining in Sanshandao Gold Mine indicate that the fractal dimension of plastic zone (FDPZ) where the failure characteristics occur is 1.4598......
at a constant tool travel speed, the material flow near the pin gets stronger. The predicted shape and size of the weld nugget zone match with the experimentally measured ones. Key words: 2024 aluminium..., porosity and solidification cracking in the fusion zone, large residual stress and thermal distortion of the welded structures [1]. These factors make the joining of Al alloys by conventional processes......
with weld toes located in the weld metal or in the partially melted zone (PMZ) exhibited larger elongation than joints with weld toes located at the juncture of the weld metal and the PMZ. Key words... by weld reinforcement. However, the weld reinforcement can induce stress concentration around the weld toe, impairing its reinforcing effects. Furthermore, a partially melted zone (PMZ) exists......
assumption and confinement of concrete in confined zone, the stress distribution and strain distribution along the wall section at yield state and ultimate state were proposed. The yield load bearing... deduced. The deformation capacity of structural walls was recommended. The stirrup characteristic value and the length of confined zone were put forward. The results show that the crash of concrete......
model of stress, strain, strain rate and temperature in shear zone, as well as the two-dimensional cutting force, was established. The constrution technology of material constitutive model by taking the ratio of length to depth in shear zone as an iterative variable was developed. With the split Hopkinson pressure bar (SHPB) compression experiment and orthogonal cutting experiment, the material......
AA5754-O铝合金电阻点焊接头(Resistance spot weld, RSW)横截面的典型宏观结构照片.由图4可看出,根据组织和性能的差异,接头可分为3个典型区域:焊核区,热机械影响区(Thermo- mechanically affected zone,TMAZ)和母材区.3个区域的尺寸,组织形貌差异主要是由焊接过程中不同区域受到的电阻热不同所致.试验制备的不同焊点直径(和)的电阻点焊接头宏... to the differences of microstructure and properties, the weld joint can be divided into three regions, i.e. nugget, thermo-mechanically affected zone (TMAZ) and base metal (BM). An equiaxed dendritic......
金失稳区微观组织 Fig. 10 Microstructures of instability zone in Ti-22Al-26Nb-2Ta-0.5Y alloy 图11 Ti-22Al-26Nb-2Ta-0.5Y合金稳定区微观组织 Fig. 11 Microstructures of stabilized zone.... The stable zone is (900-1000 ℃, 0.001-0.03 s-1). The deformation mechanism of the stable zone is mainly superplasticity. It is found that the suitable deformation parameters of Ti-22Al-26Nb-2Ta-0.5Y alloy......
接触区域压应力和切应力的分布(见图3),这为研究微动接触状态提供了重要基础.如图3(a)所示,当施加的切向力T小于临界滑动摩擦力时,两个弹性接触体不发生相对滑动,只在一部分接触界面上产生微滑,该滑动区域被定义为滑移区(Slip zone);而在其余部分只发生弹性变形,被定义为黏着区(Stick zone).随着切向力增加(仍小于临界值),黏着区减小而滑移区向内扩展,如图3(b)所示.这种接触中心黏... center, and only slightly scratch occurred at the contact edge. In the MSR, severe plastic deformation occurred in the stick zone, and surface fatigue wear and abrasive wear were dominant in the slip......