scholarly journals Thermomechanical coupling effect on characteristics of oxide film during ultrasonic vibration-assisted ELID grinding ZTA ceramics

2020 ◽  
Author(s):  
Fan CHEN ◽  
Guangxi LI ◽  
Bo ZHAO ◽  
Wenbo BIE
Keyword(s):  
Oxide Film ◽  
Ultrasonic Vibration ◽  
Coupling Effect ◽  
Thermomechanical Coupling ◽  
Elid Grinding

Thermomechanical coupling effect of PVC sheet with defects

2008 ◽  
Vol 15 (S1) ◽  
pp. 568-572 ◽  
Author(s):  
Zhan-yu Yang ◽  
Ying-she Luo ◽  
Jian-xin Su ◽  
Yong-zhong Zhang ◽  
Xu-hua Deng ◽  
...  
Keyword(s):  
Coupling Effect ◽  
Thermomechanical Coupling

Forming Mechanism of Composite Abrasive Grains in Oxide Film on ELID Wheel and its Microstructure

2016 ◽  
Vol 709 ◽  
pp. 77-81 ◽  
Author(s):  
Ji Cai Kuai ◽  
Cheng Ran Jiang ◽  
Jiang Wei Wang
Keyword(s):  
Oxide Film ◽  
Grinding Wheel ◽  
Compound Structure ◽  
Wheel Surface ◽  
Forming Mechanism ◽  
Elid Grinding ◽  
Abrasive Grains ◽  
Shaped Crack

In this paper we analyze the forming mechanism of composite abrasive grains in oxide film on ELID grinding wheel surface, By using composition information and by taking advantage of microscale structure, we have investigated that abrasive grains surface is covered by a layer of oxide film and the fresh oxide film is loose and porous like turtle shaped crack when crushed and dried. The elements of oxide film consist of α-Fe2O3 with sphere grain of 5-50nm. This phenomena is demonstrated that the composite abrasive grains in oxide film is a compound structure which is centered by abrasive grains, with α-Fe2O3,Fe (OH)3 surrounded.

Experimental study on the characteristic and function of oxide film formed on grinding wheel in ELID precision grinding

2019 ◽  
Vol 72 (5) ◽  
pp. 549-555
Author(s):  
Jia-Bo Zhang ◽  
Yang Yang ◽  
Xiao-Hui Zhang ◽  
Jia-Liang Guan ◽  
Li-Yan Zheng ◽  
...  
Keyword(s):  
Oxide Film ◽  
Formation Rate ◽  
Combination Method ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Content Type ◽  
Elid Grinding ◽  
Grinding Fluid ◽  
Film Forming ◽  
And Function

Purpose The purpose of this study is to investigate the characteristic and function of oxide film formed on grinding wheel in electrolytic in-process dressing (ELID) precision grinding and improve the quality of ELID grinding. Design/methodology/approach Dynamic film forming experiments were carried out with a simulation device close to the actual processing conditions. Then, the ELID grinding experiments of bearing rings were performed using grinding wheels with good film forming effect. The experiment was designed by quadratic regression general rotation combination method. The influence of grinding depth, electrolytic voltage, duty cycle and grinding wheel linear speed on grinding effect is analyzed. Findings A mathematical model for the formation rate of oxide film was established. The experiments show that the composition of grinding wheel and grinding fluid, as well as the electrical parameters, influence the film forming effect. Thus, the oxide film plays an important role in ELID grinding. Originality/value This study provides a reference for the design and selection of grinding wheel and grinding fluid and the setting of process parameters in ELID grinding.

scholarly journals A Novel Design of Rescue Capsule considering the Pressure Characteristics and Thermal Dynamic Response with Thermomechanical Coupling Action Subjected to Gas Explosion Load

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Xiaowei Zhai ◽  
Shibo Wu ◽  
Kai Wang ◽  
Xiaokun Chen ◽  
Haitao Li
Keyword(s):  
Dynamic Response ◽  
Coal Mine ◽  
Coupling Effect ◽  
Design Method ◽  
Thermomechanical Coupling ◽  
Structural Safety ◽  
Coupling Mechanism ◽  
Gas Explosion ◽  
Explosion Load ◽  
Mine Rescue

To ensure the structural safety and reliability of coal mine rescue capsule in disastrous surroundings after gas explosion, in this paper, the thermomechanical coupling effect on a certain structure subjected to gas explosion was analyzed, and then a novel rescue capsule with a combination of radius and square features was designed according to the underground surroundings and relevant regulations on mine rescue devices. Foremost, the coupling mechanism of thermal-fluid-solid interaction between gas explosion shock wave and rescue capsule and the thermal dynamic response of the capsule subjected to explosion load of gas/air mixture was investigated and revealed by employing LS-DYNA. The variation laws and characteristics of stress field, displacement field, and temperature field of the capsule were analyzed based on the simulation results. Results show that the structural safety, tightness, and reliability of the capsule meet the requirements of the national safety regulations. The design method presented in this work provides a new thought for design of coal mine rescue capsule.

Adhesion Model and Shedding Limit's Identification of the Oxide Film on the Surface of ELID Grinding Wheel

2014 ◽  
Vol 900 ◽  
pp. 557-560 ◽  
Author(s):  
Ji Cai Kuai
Keyword(s):  
Oxide Film ◽  
Adhesion Strength ◽  
Grinding Force ◽  
Adhesion Property ◽  
Cemented Carbide ◽  
Grinding Wheel ◽  
Strength Model ◽  
Elid Grinding ◽  
Adhesion Model

The adhesion property of oxide film has great effects on the grinding quality and efficiency of ELID grinding. In this paper, adhesion strength model of oxide film is established, ELID grinding is conducted to nanometric cemented carbide and ordinary cemented carbide, ELID grinding force is measured, adhesive stress is calculated and the correctness of adhesion model is verified. The results show that the adhesion strength of oxide film is relatively greater, the transition from γ-Fe2O3to α-Fe2O3in the oxide film is relatively fuller and the polishing performance is relatively better while the grinding depth is smaller; with the deepening of grinding, the adhesion strength of oxide film reduces, the composition of the oxide film that transforms into α-Fe2O3is less and the polishing ability reduces. The adhesion model of oxide film well reflects the adhesion property of oxide film, and the application of this model can represent the distribution, shedding and updating of the oxide film on the surface of grinding wheel.

Dynamic Instability of a Cantilever Column Subjected to a Follower Force Including Thermomechanical Coupling Effect

1971 ◽  
Vol 38 (4) ◽  
pp. 839-846 ◽  
Author(s):  
R. C. Shieh
Keyword(s):  
Boundary Value Problem ◽  
Boundary Conditions ◽  
Critical Loads ◽  
Dynamic Instability ◽  
Coupling Effect ◽  
Follower Force ◽  
Thermomechanical Coupling ◽  
Damping Coefficients ◽  
Critical Dynamic ◽  
Linear Thermoelasticity

Within the context of the linear thermoelasticity theory, including thermomechanical coupling effect, the dynamic instability of equilibrium of an elastic cantilever column subjected to a follower-type force at its free end is studied. The surfaces of the column are either kept at constant temperature (isothermal) or thermally insulated (adiabatic). The boundary-value problem is first formulated, and then it is solved in general and in particular for the depth-length ratio much less than unity. Numerical results for the critical loads are given for various values of the thermal parameters. It is shown that, for a tangential follower force, the critical dynamic (oscillatory) instability load may be reduced through the coupling effect to approximately one half of that of the corresponding uncoupled isothermal problem (which was solved by Beck [14] in 1952). Analytical results are also obtained for the damping coefficients for both adiabatic and isothermal boundary conditions. From a comparison with available experiment for aluminum, it appears that material damping, at least for this material, is almost entirely due to thermomechanical coupling.

Formation Mechanism and Simulation of Oxide Film in Electrodeless ELID Grinding

2010 ◽  
Vol 97-101 ◽  
pp. 2961-2964
Author(s):  
Kun Tang ◽  
Shao Hui Yin ◽  
Yu Feng Fan ◽  
Yong Jian Zhu ◽  
Xian Liang Zeng
Keyword(s):  
Oxide Film ◽  
Formation Mechanism ◽  
Growth Process ◽  
Film Formation ◽  
Formation Model ◽  
Nonlinear Functions ◽  
Elid Grinding ◽  
Oxide Film Thickness ◽  
Simulation Results ◽  
Film Formation Mechanism

This paper reports a study on oxide film formation mechanism in electrodeless ELID grinding. The formation mechanism of oxide film was analyzed based on electrochemical principles, its formation model was built and the growth process was also simulated. The simulation results showed that the oxide film thickness h and its growth rate g are nonlinear functions of time t, voltage and duty cycle are important factors which take effect on g and h, and the electrodeless ELID grinding is a process of weak electrolysis and suitable to use micro wheel.

Sign in / Sign up

Export Citation Format

Share Document