scholarly journals Real-Manufacturing-Process Finite Element Modeling of Aramid Honeycomb for Cutting Mechanism Revealing

2021 ◽  
Author(s):  
Yuxing Yang ◽  
Yongjie Bao ◽  
Qihao Xu ◽  
Jinlong Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Manufacturing Process ◽  
Element Model ◽  
Cutting Process ◽  
Disc Cutter ◽  
Cutting Mechanism ◽  
Initial State ◽  
Final State ◽  
Cutting Experiment

Abstract A finite element model for honeycomb cutting was proposed to reveal its cutting mechanism in the process of cutting with disc cutter, which solves the problem of efficient honeycomb cutting modeling by imitating the real manufacturing process of the aramid honeycomb and solves the problem of honeycomb material assignment by developing a material calculation method. Cutting experiment of ACCH-1-1.83-48 aramid honeycomb specimen concerning on the cutting forces response and cutting damages was conducted. The comparison between the finite element model results and the experimental results validated that the proposed method was effective for investigating the cutting process and mechanism for the aramid honeycomb. Predicted cutting mechanism results show that: (a) cutting process of the aramid honeycomb can be divided into 3 stages with 4 characteristic states: initial state, cut-in state, cut-out state and final state; (b) cell wall bending in the cutting direction relieves the cutting force, and strong plasticity of the aramid fiber makes it hard to break, which lead to uncut fiber and burr damages; (c) using sharp tip cutter as well as bonding both top and bottom of the honeycomb to two stiffer parts individually are beneficial to obtain good cutting quality with less damages.

Thermal-Mechanical Analysis of an NCA Type of Chip-on-Glass Assemblies

2000 ◽  
Author(s):  
Hsien-Chie Cheng ◽  
Ming-Hsiao Lee ◽  
Kuo-Ning Chiang ◽  
Chung-Wen Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Contact Resistance ◽  
Contact Stress ◽  
Manufacturing Process ◽  
Element Model ◽  
Conductive Adhesive ◽  
Physical Contact ◽  
Design Parameters ◽  
Design Quality

Abstract Since the electrical conduction in the COG assembly using a non-conductive adhesive takes place through the connection of the bump and the electrodes, the contact resistance can be applied to the evaluation of the design quality as well as the overall reliability of the particular assembly. It should be further noted that as reported in the literature (e.g., see Liu, 1996; Kristiansen et al, 1998; Nicewarner, 1999; Timsit, 1999), the contact resistance between the bump and the electrode on the substrate strongly depends on the contact stress and the contact area. A higher reliability of the packaging somewhat relies on better contact stability as well as larger bonding stresses. In order to explore the physical contact behaviors of a non-conductive adhesive type of COG assemblies, the contact pressure during manufacturing process sequences and during the temperature variation are extensively investigated using a three-dimensional nonlinear finite element model. The so-called death-birth simulation technique is applied to model the manufacturing process sequences. The typical COG assemblies associated with two types of micro-bumps that are made of different materials: metal and composite are considered as the test vehicle. The contact stress between the electrode and the bump is extensively compared at each manufacturing sequence as well as at elevated temperature in order to investigate the corresponding mechanical interaction. Furthermore, the adhesion stresses of the adhesive are also evaluated to further investigate the possibilities of cracking or delamination within the adhesive and in its interfaces with the die and with the substrate. At last, a parametric finite element model is performed over number of geometry/material design parameters to investigate their impact on the contact/adhesion stresses so as to attain a better reliability design.

Cutting Characteristics of Sugarcane in Terms of Physical and Chemical Properties

2020 ◽  
Vol 63 (4) ◽  
pp. 1007-1017
Author(s):  
Luxin Xie ◽  
Jun Wang ◽  
Shaoming Cheng ◽  
Dongdong Du
Keyword(s):  
Finite Element ◽  
Chemical Composition ◽  
Correlation Analysis ◽  
Finite Element Model ◽  
Physical Properties ◽  
Cutting Force ◽  
Single Point ◽  
Cutting Speed ◽  
Element Model ◽  
Cutting Process

HighlightsThe cutting mechanism of sugarcane stalks using single-point clamping was analyzed.Physical properties, chemical composition, and maximum cutting force of sugarcane were explored.Strong and complicated correlations between physical properties and chemical composition were established.Stress distributions in sugarcane stalks and the cutting blade were predicted using a finite element model.Abstract. Research on the cutting characteristics of sugarcane stalks is of great significance to improve harvest mechanization. In this study, perpendicular cutting of sugarcane stalks at six different nodes and internodes along the stalk was tested using a single-point clamping method at three cutting speeds (30, 40, and 50 mm min-1). The physical properties and chemical composition were also measured. At the 50 mm min-1 cutting speed, the maximum cutting forces at nodes and internodes upward along the stalk decreased gradually from 810 to 530 N and from 600 to 440 N, respectively. The maximum cutting force was positively correlated with the cutting speed at the same position. Differences in the microstructures of nodes, internodes, and epidermis were revealed by SEM micrographs. The physical properties and chemical composition of the stalks showed significant correlations. Correlation analysis was used to clarify the complicated interrelationships among these independent variables and revealed the interacting mechanism between physical properties and chemical composition. A finite element model was established to simulate the sugarcane cutting process. Results showed that the simulated cutting resistance of the blade was close to that in the experiments. The maximum Von Mises stress of the sugarcane stalk and blade in the cutting process were about 23.34 and 254.17 MPa, respectively. The results of this study provide guidance for designing and optimizing base-cutters of sugarcane harvesters and similar cutting equipment. Keywords: Chemical composition, Correlation analysis, Cutting characteristics, Microstructure, Physical properties, Simulation.

Simulation and Study on the Formation Mechanism of Chip Based on Micro Cutting

2016 ◽  
Vol 679 ◽  
pp. 103-106 ◽  
Author(s):  
Qi Ding Li ◽  
Ke Tian Li ◽  
Hai Min Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Cutting Force ◽  
Formation Mechanism ◽  
Element Model ◽  
Cutting Mechanism ◽  
Cutting Depth ◽  
Micro Cutting ◽  
Model Based ◽  
Simulation Results

A finite element model based on Abaqus/Explicit is built. Micro cutting mechanism of Al7075 with different cutting depth is simulated and analyzed. The simulation results show that if the cutting depth is more than 10μm, the chip is a kind of continuous curl. If the cutting depth is less than 10μm, the chip is a kind of feathery squeeze debris. When the cutting depth is very small (3μm), the shape of chips is just like discontinuous wrinkle. By contrasting the simulation results of cutting force with its theoretical values, they have the same result. The model of the chip prediction could achieve ideal simulation results.

Study on Numerical Modeling of Three Dimensional Oblique Cutting for Aluminum Alloy Cutting Process

2010 ◽  
Vol 37-38 ◽  
pp. 1316-1320 ◽  
Author(s):  
Xiang Hua Zhang ◽  
Guo Hong Dai
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Cutting Temperature ◽  
Cutting Parameters ◽  
Element Model ◽  
Cutting Process ◽  
Oblique Cutting ◽  
Optimization Of Cutting Parameters

To reveal the cutting process of aluminum alloy 7050, the oblique cutting finite element model was established to simulate the cutting process. The key techniques including material constitutive model and temperature finite element model were investigated. The chip of aluminum alloy 7050 formed in the simulation of cutting process, and the cutting force curve and cutting temperature distribution were analyzed. The chip obtained by simulation is spiral, and the chip shape of simulation agrees well with the chip of cutting experiment. The oblique cutting finite element model of aluminum alloy 7050 can be used to investigate the optimization of cutting parameters and tool angle further.

Finite Element Simulation of Tire-Rim Interface

1989 ◽  
Vol 17 (4) ◽  
pp. 305-325 ◽  
Author(s):  
N. T. Tseng ◽  
R. G. Pelle ◽  
J. P. Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Simulation ◽  
Contact Pressure ◽  
Element Model ◽  
Experimental Measurements ◽  
Inflation Pressure ◽  
Interference Fit ◽  
Element Simulation ◽  
Rubber Composite

Abstract A finite element model was developed to simulate the tire-rim interface. Elastomers were modeled by nonlinear incompressible elements, whereas plies were simulated by cord-rubber composite elements. Gap elements were used to simulate the opening between tire and rim at zero inflation pressure. This opening closed when the inflation pressure was increased gradually. The predicted distribution of contact pressure at the tire-rim interface agreed very well with the available experimental measurements. Several variations of the tire-rim interference fit were analyzed.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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