scholarly journals A micro-scale cutting model for UD CFRP composites with thermo-mechanical coupling

2017 ◽  
Vol 153 ◽  
pp. 18-31 ◽  
Author(s):  
Hui Cheng ◽  
Jiaying Gao ◽  
Orion Landauer Kafka ◽  
Kaifu Zhang ◽  
Bin Luo ◽  
...  
Keyword(s):  
Mechanical Coupling ◽  
Micro Scale ◽  
Cfrp Composites ◽  
Cutting Model

scholarly journals Factor Analysis of Machining Parameters On Surface Integrity of CFRP Composites Based On A Microscopic Finite Element Cutting Model

2021 ◽  
Author(s):  
Jianzhang Xiao ◽  
Guifeng Wang ◽  
Hang Su ◽  
Pengcheng Huang ◽  
Zhongzhe Chen
Keyword(s):  
Surface Roughness ◽  
Factor Analysis ◽  
Surface Integrity ◽  
Fiber Orientation ◽  
Subsurface Damage ◽  
Machining Parameters ◽  
Factors Affecting ◽  
Cfrp Composites ◽  
Damage Depth ◽  
Cutting Model

Abstract In the paper, a three-dimensional (3D) micromechanical finite element (FE) cutting model with three phases was developed to study the surface integrity of CFRP composites. The surface roughness and the depth of subsurface damage were predicted by using the FE cutting model, which were used to characterize the surface integrity. The machined surface observations and surface roughness measurements of CFRP composites at different fiber orientations were also performed for model validation. It is indicated that the 3D micromechanical model is capable of precisely predicting the surface integrity of CFRP composites. To investigate the complex coupling influences of multiple machining parameters on the surface integrity, the factor analysis of multiple machining parameters was performed, and then the effects of these machining parameters on the surface roughness and subsurface damage depth were obtained quantitatively. It was found that the fiber orientation angle and cutting speed are the most significant factors affecting the surface roughness, and the fiber orientation and edge radius are the main factors affecting the subsurface damage depth. The results also reveal that coupling effects of depth of cut and edge radius should be considered for improving the surface integrity of CFRP composites.

The Research on Thermal-Mechanical Coupling Simulation of Steam Turbine Vane Material’s Cutting Process

2010 ◽  
Vol 148-149 ◽  
pp. 615-620
Author(s):  
Si Tu Yu ◽  
Deng Wan Li ◽  
Hong Xie ◽  
Jin Chun Feng ◽  
Ming Heng Xu
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Single Point ◽  
Constitutive Models ◽  
Cutting Process ◽  
Adaptive Meshing ◽  
Mechanical Coupling ◽  
Turbine Vane ◽  
Cutting Parameter Optimization ◽  
Cutting Model

In order to explore the cutting rules of the 43-inch vane material --1Cr12Ni3Mo2VNbN on the turbine vane, and research the stress in cutting area, the strain as well as the temperature distribution and the variation, providing the reference data for the large-scale vane-root milling cutter's geometric parameter design and the cutting parameter optimization, the authors employed ANSYS / LS-DYNA finite element method to simulate and research the cutting process of the vane material. The authors adopted the two-dimensional plane element 2D SOLID l62 of the single-point integration Lagrange algorithm to establish the finite element cutting model, and established the Cowper-Symonds constitutive models based on the vane material, applied the 2D-r adaptive meshing to simulate the separation of the chip and workpiece. Obtain the distribution and rules of the stress, the strain as well as the temperature in the cutting area, and greatly shorten the period of the vane root milling cutter’s designing and trial-production.

scholarly journals Prediction of Shearing and Ploughing Constants in Milling of Inconel 718

2021 ◽  
Vol 5 (1) ◽  
pp. 8
Author(s):  
Chi-Jen Lin ◽  
Yu-Ting Lui ◽  
Yu-Fu Lin ◽  
Hsian-Bing Wang ◽  
Steven Y. Liang ◽  
...  
Keyword(s):  
Inconel 718 ◽  
Coupling Effect ◽  
Chip Thickness ◽  
Friction Angle ◽  
Helix Angle ◽  
Peripheral Milling ◽  
Inconel 718 Alloy ◽  
Oblique Cutting ◽  
Mechanical Coupling ◽  
Cutting Model

The present study proposes an integrated prediction model for both shearing and ploughing constants for the peripheral milling of Inconel 718 by using a preidentified mean normal friction coefficient. An equation is presented for the identification of normal mean friction angle of oblique cutting in milling. A simplified oblique cutting model is adopted for obtaining the shear strain and shearing constants for a tool of given helix angle, radial rake angle, and honed edge radius. The shearing and ploughing constants predicted from analytical model using the Merchant’s shear angle formula and the shear flow stress from the selected Johnson–Cook material law are shown to be consistent with the experimental results. The experimentally identified normal friction angles and shearing and edge ploughing constants for the Inconel 718 milling process are demonstrated to have approximately constant values irrespective of the average chip thickness. Moreover, the predicted forces obtained in milling aged Inconel 718 alloy are in good agreement with the experimental force measurements reported in the literature. Without considering the thermal–mechanical coupling effect in the material law, the presented model is demonstrated to work well for milling of both annealed and aged Inconel 718.

Evaluation of heat generation using a microscopic cutting model with thermo-mechanical coupling for carbon fiber reinforced polymer composites

2020 ◽  
Vol 39 (21-22) ◽  
pp. 793-804
Author(s):  
Miao Qian ◽  
Jianzhang Xiao ◽  
Guifeng Wang ◽  
Pengcheng Huang ◽  
Zhongzhe Chen ◽  
...  
Keyword(s):  
Finite Element ◽  
Fiber Orientation ◽  
Cutting Temperature ◽  
Subsurface Damage ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Mechanical Coupling ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Cutting Model

A three-dimensional micromechanical finite element cutting model with the thermo-mechanical coupling was developed for carbon fiber reinforced polymer composites in the paper. The finite element modeling considers the three phases of a composite, in which the interphase between the fiber and matrix can realize heat transfer and allow debonding to represent the failure of composites. The model predictions of the machining responses, such as cutting temperature and subsurface damage, at different fiber orientations were compared with various experimental data for model validation. It is indicated that the three phase micromechanical model is capable of precisely predicting cutting temperature and the damage induced by the cutting tool. It was found that cutting temperature and subsurface damage strongly depend on the fiber orientation. Subsurface damage is easily occurs in a fiber orientation range of 90°–135°, while the largest depth of the thermal damage occurs at 90°. In addition, the effect of machining parameters on the cutting temperature was investigated based on the cutting model. It was showed that the cutting speed should be reasonably selected to control the cutting temperature. The temperature decrease with increase the rake angle, while increase with increase depth of cut and radius of cutting edge.

A two degrees of freedom comb capacitive-type accelerometer with low cross-axis sensitivity

2019 ◽  
Vol 13 (3) ◽  
pp. 5334-5346
Author(s):  
M. N. Nguyen ◽  
L. Q. Nguyen ◽  
H. M. Chu ◽  
H. N. Vu
Keyword(s):  
Degrees Of Freedom ◽  
Proof Mass ◽  
Vibration Modes ◽  
Electrode Structure ◽  
Element Analysis ◽  
Mechanical Coupling ◽  
Fully Differential ◽  
Mode Effects ◽  
The Finite Element Analysis ◽  
Cross Axis

In this paper, we report on a SOI-based comb capacitive-type accelerometer that senses acceleration in two lateral directions. The structure of the accelerometer was designed using a proof mass connected by four folded-beam springs, which are compliant to inertial displacement causing by attached acceleration in the two lateral directions. At the same time, the folded-beam springs enabled to suppress cross-talk causing by mechanical coupling from parasitic vibration modes. The differential capacitor sense structure was employed to eliminate common mode effects. The design of gap between comb fingers was also analyzed to find an optimally sensing comb electrode structure. The design of the accelerometer was carried out using the finite element analysis. The fabrication of the device was based on SOI-micromachining. The characteristics of the accelerometer have been investigated by a fully differential capacitive bridge interface using a sub-fF switched-capacitor integrator circuit. The sensitivities of the accelerometer in the two lateral directions were determined to be 6 and 5.5 fF/g, respectively. The cross-axis sensitivities of the accelerometer were less than 5%, which shows that the accelerometer can be used for measuring precisely acceleration in the two lateral directions. The accelerometer operates linearly in the range of investigated acceleration from 0 to 4g. The proposed accelerometer is expected for low-g applications.

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