网络互穿复合材料切削仿真研究

发布时间：2018-04-22 04:02

本文选题：网络结构 + 复合材料　；参考：《济南大学》2015年硕士论文

【摘要】：网络互穿复合材料是一种以三维连续网格结构作为增强相的新型材料,目的是为了提高材料的综合性能,相比于离散相增强的复合材料,网络互穿复合材料具有更加优越的力学性能。本文采用车削实验以及有限元分析软件对网络互穿复合材料进行了切削实验与仿真研究。根据具体实验需要,设计并编织了包含轴向分布、径向分布以及周向分布的三维网络结构增强相,采用无压力浸透法制备了基体相材料为ZL107,增强相材料为0Cr18Ni9的网络互穿复合材料,并总结了其制备中的关键工艺技术与方法。通过车削实验,研究了表面粗糙度随切削用量的变化规律,总结了增强相的不同破坏形式,归纳了切削加工表面存在的各种缺陷,并分析了其形成机理,同时研究了不同密度分布增强相对两相材料界面结合处切削力变化的影响程度。结果表明:由于增强相的存在,致使网络互穿复合材料加工表面质量严重下降,其表面粗糙度普遍高于单一匀质材料,并且出现了增强相凸起、基体撕裂、增强相已加工表面的涂覆现象以及基体表面微裂纹等缺陷,切削过程也很不稳定,在增强相分布密集处,切削力波动幅度较大,且需较长时间才能恢复平稳。以实验为基础,建立了网络互穿复合材料的二维切削模型,通过不同形式的仿真分析,验证了此模型的可行性,与此同时,分析了增强相各种形式下不同切削阶段的应力分布特点,结果表明:网络结构增强相比单一结构增强相具有更好的稳定性,有效防止了增强相在切削过程中的过度变形,减少了增强相与基体相界面之间的破坏程度。
[Abstract]:The network interpenetrating composite is a new type of material with three-dimensional continuous mesh structure as the reinforcement phase. The purpose of this material is to improve the comprehensive properties of the material, compared with the composite reinforced by discrete phase. Network interpenetrating composites have better mechanical properties. In this paper, cutting experiments and simulation of interpenetrating composites are carried out by means of turning experiment and finite element analysis software. According to the need of the experiment, a three-dimensional network structure enhancement phase including axial distribution, radial distribution and circumferential distribution is designed and woven. The network interpenetrating composites with ZL107 matrix and 0Cr18Ni9 reinforced phase were prepared by pressureless immersion method, and the key technology and methods in the preparation were summarized. Through turning experiments, the variation of surface roughness with cutting parameters is studied, the different failure forms of reinforcing phase are summarized, the defects of machined surface are summarized, and the formation mechanism is analyzed. At the same time, the influence of different density distribution on the cutting force change at the interface of the two phase material was studied. The results show that due to the existence of reinforcement phase, the machined surface quality of interpenetrating network composites is seriously reduced, the surface roughness is generally higher than that of single homogeneous material, and the reinforcement phase protrudes and the matrix tears occur. The cutting process is also unstable due to the coating phenomenon on the machined surface of the reinforced phase and the microcracks on the substrate surface. The cutting force fluctuates greatly in the dense distribution of the enhanced phase and takes a long time to recover steadily. On the basis of experiments, a two-dimensional cutting model of interpenetrating network composites is established. The feasibility of the model is verified by simulation analysis in different forms, at the same time, The characteristics of stress distribution in different cutting stages of reinforcement phase are analyzed. The results show that the enhancement of network structure has better stability than that of single structure enhancement phase, which effectively prevents the excessive deformation of reinforcement phase in the cutting process. The failure degree between reinforcing phase and matrix phase interface is reduced.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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