Finite element analysis of grinding process of long fiber reinforced ceramic matrix woven composites: Modeling, experimental verification and material removal mechanism

2019 ◽  
Vol 45 (13) ◽  
pp. 15920-15927 ◽  
Author(s):  
Yuguo Wang ◽  
Haoji Wang ◽  
Jinhua Wei ◽  
Bin Lin ◽  
Jingyu Xu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Verification ◽  
Material Removal ◽  
Ceramic Matrix ◽  
Woven Composites ◽  
Grinding Process ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Element Analysis

scholarly journals Tentative Investigations on Reducing the Edge Effects in Pre-Polishing the Optics

2020 ◽  
Vol 10 (15) ◽  
pp. 5286
Author(s):  
Xiaolong Ke ◽  
Lei Qiu ◽  
Chunjin Wang ◽  
Zhenzhong Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Edge Effect ◽  
Edge Effects ◽  
Material Removal ◽  
Processing Time ◽  
Grinding Process ◽  
Element Analysis ◽  
Edge Zone ◽  
The Finite Element Analysis

The material removal depth in the pre-polishing stage of the precision optics is usually tens of microns to remove the subsurface damage and grinding marks left by the previous grinding process. This processing of the upstand edge takes a large part of the time at this stage. The purpose of this paper is to develop a method that can reduce the edge effect and largely shorten the processing time of the pre-polishing stage adopting the semirigid (SR) bonnet. The generation of the edge effect is presented based on the finite element analysis of the contact pressure at the edge zone firstly. Then, some experimentations on the edge effect are conducted, and the results proved that the SR bonnet tool can overhang the workpiece edge in the pre-polishing stage to reduce the width and height of the upstand edge to largely shorten the subsequent processing time of it. In addition, there exists a perfect overhang ratio, which generates the upstand edge with the smallest width and height, with no damage to the bonnet tool in the meantime. In addition, one combination of the pre-polishing parameters is concluded according to this method, which can be safely adopted in practical process.

scholarly journals Simulation of Grinding Surface Creation – A Single Grit Approach

2010 ◽  
Vol 126-128 ◽  
pp. 23-28 ◽  
Author(s):  
Xun Chen ◽  
Tahsin Tecelli Öpöz
Keyword(s):  
Finite Element ◽  
Material Removal ◽  
Total Force ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Element Analysis ◽  
Research Material ◽  
Force Variation ◽  
Major Emphasis ◽  
Good Facility

The paper presents an investigation of grinding material removal mechanism using finite element method. Understanding of grinding removal mechanism relies on the investigation of material removal by each individual grain. Although some analytical formulations have been developed to predict and to quantify the machining events in grinding, they do not illustrate every stage of abrasive actions. Finite element analysis provides good facility to present details of physical behaviour in grinding. In this research, material removal mechanism of grinding, namely rubbing, ploughing and cutting, is discussed with the variation friction coefficient. The major emphasis here is on the ploughing. Total force variation exerted during indention and sliding of a grain is also presented along its path.

Surface Behaviors of ELID Ground Engineering Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 1469-1472 ◽  
Author(s):  
Jian Yun Shen ◽  
Wei Min Lin ◽  
Hitoshi Ohmori ◽  
Xi Peng Xu
Keyword(s):  
Mechanical Properties ◽  
Material Properties ◽  
Material Removal ◽  
Grinding Process ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Silicon Nitride Ceramic ◽  
Engineering Ceramics ◽  
Elid Grinding ◽  
Engineering Ceramic

In this study, grinding of Si3N4, SiC, and Al2O3 ceramics under the condition of electrolytic in-process dressing (ELID) system was investigated. The surface appearances of these engineering ceramics during the ELID grinding process were attentively observed to describe the formation of finely finished surfaces. Based on the analysis of material properties and detailed micro-observation of ground surfaces, it can be concluded that the material removal mechanism of engineering ceramic is closely related to its mechanical properties. The silicon nitride ceramic was most easily machined to precision surface among these three engineering ceramics.

On Correlation of Pulses and Tool Elongations at Micro-Electrical Discharge Machining Aided by Ultrasonics

2015 ◽  
Vol 809-810 ◽  
pp. 309-314
Author(s):  
Daniel Ghiculescu ◽  
Nicolae Marinescu ◽  
Tomasz Klepka ◽  
Nicoleta Carutasu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Micro Electrical Discharge Machining ◽  
Machining Strategy ◽  
Element Method

The paper deals with Finite Element Method (FEM) of thermal and mechanical-hydraulic components of material removal mechanism at micro-electrical discharge machining aided by ultrasonics (μEDM+US), due to EDM and US contribution. The dimensions of craters produced by single discharges under μEDM+US conditions are determined with different pulse durations in order to establish a machining strategy with correlation of pulses and tool elongations.

Bionic research on spikes based on the tractive characteristics of ostrich foot toenail

SIMULATION ◽  
2020 ◽  
Vol 96 (9) ◽  
pp. 713-723
Author(s):  
Rui Zhang ◽  
Dianlei Han ◽  
Guolong Yu ◽  
Haitao Wang ◽  
Haibao Liu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Verification ◽  
Athletic Performance ◽  
Slope Angle ◽  
Element Analysis ◽  
Single Structure ◽  
Athletic Shoes ◽  
Mechanical Information

Inspired by the superior fixed and traction characteristics of ostrich foot toenails, we devised, optimized and manufactured the single structure and group arrangement of a new-style bionic spike for sprint shoes to improve athletic performance. The tractive performance of the bionic spike was tested by finite element analysis and experimental verification. The optimized single structure of the bionic spike had a top slope angle of 13° and the radius of the medial groove of 7.3 mm. Compared with the conventional conic spike, the maximal and stable extrusion resistances of the single bionic spike decreased by about 25% and 40% respectively, while the maximal and stable horizontal thrusts increased by about 16% and 10%, respectively. In addition, the arrangement of the bionic spikes was also optimized. Compared with the conventional spike group, the maximal and stable extrusion resistances of the bionic spike group decreased by 11.0% and 6.2%, respectively, while the maximal and stable horizontal thrusts increased by 20.0% and 16.0%, respectively. The current results may provide useful mechanical information that can help develop a better design of athletic shoes with the potential for advanced performance.

Finite Element Analysis of Mesh Size Effect of 3D Angle-Interlock Woven Composites Using Voxel-Based Method

2018 ◽  
Vol 25 (4) ◽  
pp. 905-920 ◽  
Author(s):  
Diantang Zhang ◽  
Guyu Feng ◽  
Mengyao Sun ◽  
Song Yu ◽  
Yuanhui Gu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Size Effect ◽  
Mesh Size ◽  
Woven Composites ◽  
Element Analysis
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