An investigation on tensile and fatigue properties of cast Al-7Si-1.5Cu alloy applied in cylinder head considering size effect phenomenon

Zhao, Chengzhang; Huang, Weiqing; Liu, Jinxiang; Ren, Peirong; Zuo, Zhengxing; Yan, Keping

doi:10.1016/j.mtcomm.2022.103271

Cited by 2 publications

(1 citation statement)

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“…Where the activation of a dislocation source causes the grain to undergo a yielding effect, Dong [6] obtained a model for the accumulation and transfer of newly generated dislocations. Zhao [7] showed that the grain size effect is caused by the anisotropy caused by the different orientations of a small number of grains in thickness, and showed that the Hall-Petch equation is the most effective equation to describe the grain size effect, finding that the dislocation density is influenced by the average grain size, modifying the Hall-Petch equation. Peng Linfa [8][9][10] obtained the flow stresses at mesoscopic scales by substituting the scaling factors characterising the size effect into the instanton equations.…”

Section: Iintroductionmentioning

confidence: 99%

Influence of Diamond Tool Quality on Surface Roughness and Methods of Improving Surface Roughness

Zhuang

Liu²,

Zong³

et al. 2023

Preprint

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Spherical/aspherical mirrors are widely used in optical and imaging systems, but their reflectivity is influenced by the surface roughness values. In this paper, the influence of the quality of diamond tool on the surface roughness of workpiece is systematically studied. The quality of diamond tools can be divided into two categories: the waviness of tool tip and the quality of cutting edge of diamond tools. The full arc waviness of diamond tools is obtained by Gauss filtering method, and the evaluation accuracy is equivalent to that of commercial testing equipment. According to Hertz contact theory and three-dimensional topography of diamond cutting edge surface, the friction coefficient model between cutting edge and workpiece is established. According to the stress of the material, the relationship between the three-dimensional shape of the cutting edge and the elastic recovery is obtained. Passivating the cutting edge of the tool improves the quality of the cutting edge and finally improves the quality of the machined surface. In order to ensure the waviness of the tool tip arc, this paper puts forward a method to restrain the wear of diamond tools. In order to restrain tool wear, the combination of diamond tool crystal plane and diamond material were optimized in this paper. Through the above theoretical analysis and influence law, it can provide guidance for the subsequent high-quality machining of spherical/aspheric surfaces.

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