Contact Nonlinear Finite Element Analysis Research Articles

Contact analysis of heavy-duty apron feeder with clearance

The problem of clearance contact between the bearing plate and the supporting guide rail is studied when the heavy‐duty Apron Feeder is subjected to impact load. Based on the energy method, the impact force of the falling ore was calculated, and the nonlinear contact finite element analysis of the structure with clearance was performed using ANSYS Workbench. The results show that at the first moment of contact, the initial contact shape is an approximately linear contact, and then a deformation occurs near the contact line, which quickly evolves from a linear contact to a surface contact. The contact stress distribution is diffused outward along the initial contact boundary and gradually decreases, and the stress concentration occurs at the contact boundary. When the distance is different, the shape of the contact area is similar, but when the distance is large, the contact area is small and the stress distribution is more concentrated. The nonlinear contact calculation of the skirt feeder reveals the instantaneous contact process of the plate rail under the impact force and determines the influence of the distance size on the contact properties, which provides a theoretical basis for the selection of the distance value.

Nonlinear finite element analysis on the sealing performance of rubber packer for hydraulic fracturing

As the core component of a fracturing tool, a rubber packer plays a vital role during the well stimulation process. Its sealing performance significantly affects the fracturing effects. This study adopted a 3D multi-body contact nonlinear finite element analysis with the Mooney–Rivlin constitutive model to investigate the sealing performance of the hydrogenated nitrile butadiene rubber. The effects of key parameters such as the total thickness, sub-thickness, height, and rubber hardness on the sealing performance were systemically investigated. Numerical results indicated that maximum contact stress appeared around the rubber packer's upper part because of the combined effect of friction and axial compression. Besides, the numerical results were validated with theoretical and experimental results, in which the error between theoretical and numerical results was less than 7%, and that between the numerical results and experimental results was approximately 17.7%. Under the conditions considered, key parameters of rubber packer were optimized as a total thickness of 20 mm, a sub-thickness of 13 mm, a height of 70 mm, and a hardness of 70 International Rubber Hardness Degrees, in terms of the maximum contact stress and deformation displacement. The proposed numerical approaches could accurately predict rubber packer's deformation status, which consequently had technical guiding significance for the design of similar sealing components in various applications.

Study on the opening soil knife cutting soil process of 3PF‐240 small grape covering machine

Grape covering machine as key equipment casing mechanised grape winter is drawing more and more attention. To analyse the performance of the grape covering machine, the soil cutting process of opening soil knife with a 3PF-240 grape covering machine is studied. Based on the finite-element analysis software ABAQUS, the three-dimensional dynamic contact non-linear finite-element analysis of the soil cutting process was carried out, and the cutting force curve of the cutting tool in the case of the tool was obtained. To verify the correctness of the simulation results, the grounding work of the prototype was carried out. The experimental results show that the established mechanical model of the opening soil knife is correct, which provides a theoretical basis for the further development and optimisation design of the grape cover.

Optimization analysis of giant spiral case with combined embedding method

For selecting reasonable embedding method of the giant spiral case, contact nonlinear finite element analysis is used to obtain optimal range of cushion laying for the combination embedding method of direct embedding and cushion in Wudongde hydropower station, comparing concrete stress, non-uniform uplifting displacement of baseplates, the bearing ratio of concrete, etc. The optimization results show that the combination scheme with cushion laying to 270°section can meet the control standards of strength, stiffness and displacement for structure, which is the best embedding method for this hydropower station.

Evaluation of a structural epoxy adhesive for timber-glass bonds under shear loading and different environmental conditions

This article presents a study of timber-glass adhesive joints. It examines the shear specimen and shear tools preparation process and the evaluation of the results backed up with an overview of existing similar studies. The chosen adhesive was a cold-curing two-component structural bonding epoxy resin (Mapei Adesilex PG1). The shear tests were performed under different temperatures and the timber samples had different moisture contents. A simple shear test tool was designed and was clamped into a universal testing machine for the shear test. The force and crosshead displacement values from the universal testing machine were used for evaluating the results. The environmental conditions of 20 °C and 5% timber moisture content resulted in the highest average shear strength obtained from the shear tests of the analysed joints (9.89 MPa), whereas the environmental conditions of 50 °C and 20% timber moisture content resulted in the lowest average shear strength (3.42 MPa). It was found that the joint strength is dependent on the environmental temperature and timber moisture content. Moreover, the shear specimen load-displacement behaviour at the environmental temperature of 50 °C was linear and nonlinear – depending on the timber moisture content. The most frequent failure type was timber failure. Additionally, a nonlinear contact finite element analysis was performed to demonstrate the additional shear specimen rotation due to the clearance between the shear specimen and shear tools. This impact was evaluated regarding the stress distribution in the bond line. The evaluated epoxy resin adhesive was proved to be suitable for timber-glass bonds.

Study on Failure Trend of Single Shear Hydraulic Lift Platform Structure on Basis of Static Strength Analysis

To ensure the safe use of single shear hydraulic lift platform for processing and manufacturing railway vehicles. This paper analyzes the use conditions of single shear hydraulic lift platform, and makes a contact nonlinear finite element analysis on various typical use conditions. The positions of parts subject to danger can be found out through the results of static strength analysis, which finds out the weaknesses and prejudges the failure trend of parts, and which provides guidance for prejudging the faults in actual production and can prevent occurrence of accidents.

Study on Failure Trend of Lateral Lifting Platform Structure on Basis of Static Strength Analysis

To ensure the safe use of lateral lifting platform for processing and manufacturing railway vehicles. This paper analyzes the use conditions of lateral lifting platform, and makes a contact nonlinear finite element analysis on various typical use conditions. The positions of parts subject to danger can be found out through the results of static strength analysis, which finds out the weaknesses and prejudges the failure trend of parts, and which provides guidance for prejudging the faults in actual production and can prevent occurrence of accidents.

Study on Failure Trend of L-Type Deflection Machine Structure on Basis of Static Strength Analysis

To ensure the safe use of L-type deflection machine for processing and manufacturing railway vehicles. This paper analyzes the use conditions of L-type deflection machine, and makes a contact nonlinear finite element analysis on various typical use conditions. The positions of parts subject to danger can be found out through the results of static strength analysis, which finds out the weaknesses and prejudges the failure trend of parts, and which provides guidance for prejudging the faults in actual production and can prevent occurrence of accidents.

Three-Dimensional Nonlinear Contact Finite Element Analysis of Mandibular All-on-4 Design

The All-on-4 design was used successfully for restoring edentulous mandible. This design avoids anatomic cripples such as inferior alveolar nerve by tilting posterior implants. Moreover, tilting posterior implants of All-on-4 design had a mechanical preference than the conventional design. On the other hand, the anterior implants are parallel at the lateral incisor region. Several researches showed favorable results for tilting posterior implants. However, research did not study the influence of the anterior implant position or orientation on the mechanical aspects of this design. This study analyzes the influence of varying anterior implant position and orientation of the All-on-4 design using nonlinear contact 3D finite-element analysis. Three copied 3-dimensional models of the All-on-4 design were classified according to anterior implant position and orientation. The frictional contact between fixtures and bone was the contact type in this finite element analysis. Finally, von Mises stress and strain at implant and bone levels were recorded and analyzed using finite element software. Stress concentrations were detected mainly around the posterior implant at the loaded side. Values of the maximum equivalent stress and strain were around tilted implants of design III followed by design II, then design I. Changing the position or orientation of the anterior implants in All-on-4 design influences stress-strain distribution of the whole design.

Study on Failure Trend of Double Column Tri-Axis Deflection Machine Structure on Basis of Static Strength Analysis

To ensure the safe use of double column tri-axis deflection machine for processing and manufacturing railway vehicles. This paper analyzes the use conditions of double column tri-axis deflection machine, and makes a contact nonlinear finite element analysis on various typical use conditions. The positions of parts subject to danger can be found out through the results of static strength analysis, which finds out the weaknesses and prejudges the failure trend of parts, and which provides guidance for prejudging the faults in actual production and can prevent occurrence of accidents.

Study on Failure Trend of Double Column Deflection Machine Structure on Basis of Static Strength Analysis

To ensure the safe use of double column deflection machine for processing and manufacturing railway vehicles. This paper analyzes the use conditions of double column deflection machine, and makes a contact nonlinear finite element analysis on various typical use conditions. The positions of parts subject to danger can be found out through the results of static strength analysis, which finds out the weaknesses and prejudges the failure trend of parts, and which provides guidance for prejudging the faults in actual production and can prevent occurrence of accidents.

Research on the Effect of Pump Block Material Selection on Pump Spindle Stress

Built up three-dimensional non-linear contact finite element analysis model of the spline shaft and the spline set of the electric pump machine and get the stress distribution of the spline shaft and the spline set when the shaft of electric pump retorts. The maximum stress occurs in the root of linking side of spline and the transition section. According to the calculation and contrast analysis of different material and same material of spline set, the maximum stress of the different material declines by 20.04% than the same material, and the root stress concentration coefficient declines by 13.72%, and this provides theoretical basis and analysis method.

Explicit Parametric Method for Optimal Spur Gear Tooth Profile Definition

The gear tooth profile has an immense effect on the main operating parameters of gear pairs (load capacity, working life, efficiency, vibrations, etc). In current engineering research and practice, there is a strong need to develop methods for tooth profile optimization. In this paper a new method for selecting the optimal tooth profile parameters of spur gears is described. This method has been named the Explicit Parametric Method (EPM). The addendum modification coefficient, radius of root curvature, and pressure angle of the basic rack for cylindrical gears, have been identified as the main tooth profile parameters of spur gears. Therefore, the EPM selects the optimal values for these three tooth profile parameters. Special attention has been paid to develop a method of adjustment for the particular working conditions and explicit optimization requirements. The EPM for optimal tooth profile parameters of gears uses contact nonlinear Finite Element Analysis (FEA) for calculation of deformations and stresses of gear pairs, in addition to explicit comparative diagrams for optimal tooth profile parameter selection.

Research on Vehicle Lifting Jack Structure Failure Trend on Basis of Static Strength Analysis

To ensure the safe use of vehicle lifting jack as process equipment for fabricating and producing railway vehicles, this paper analyzes on the working conditions of vehicle lifting jack and makes contact nonlinear finite element analysis on various typical working conditions. Through the analysis result on static strength thereof, the parts easily subject to dangers are located, and the failure trend of parts can be prejudged by locating the weaknesses, which guides for prejudging the failures in actual production and can prevent the occurrence of accidents.

Research on Failure Trend of Lifter on Basis of Static Strength Analysis

To ensure the safe use of lifter as process equipment for fabricating and producing railway vehicles, this paper analyzes on the working conditions of lifter and makes contact nonlinear finite element analysis on various typical working conditions. Through the analysis result on static strength thereof, the parts easily subject to dangers are located, and the failure trend of parts can be prejudged by locating the weaknesses, which guides for prejudging the failures in actual production and can prevent the occurrence of accidents.

Thermal–mechanical optimization of a novel nanocomposite-film typed flip chip technology

The paper aims at optimization of the residual thermal–mechanical behaviors of a novel Flip Chip (FC) technology during and after the fabrication process. In this study, we first introduce the novel adhesive-typed FC packaging technology, consisting of a nanocomposite film for anisotropic electrical conduction and a nonconductive paste (NCP) for developing NCP joints. In the optimization work, the material and geometry properties and the bonding process parameters are considered as the design parameters, and the constraints on the residual behaviors and the design parameters are included. To deal with the multi-criteria design optimization problem, an effective metamodeling-based design optimization scheme is applied, which integrates parametric finite element (FE) analysis, a response surface methodology (RSM) and an updating scheme. Moreover, to assess the residual behaviors, a process-dependent simulation methodology that integrates both transient thermal and nonlinear contact FE analyses and a “death–birth” meshing scheme is carried out. The validity of the process-dependent FE simulation methodology is confirmed through experiment. Finally, two design practices are performed, and the calculated optimal designs are compared with each other and with the original design. It turns out that the present optimization methodology can be very effective and robust in seeking the optimal design of the FC technology with a better residual thermal–mechanical performance after the NCP bonding process.

Study on Enhancing the Strength and Life of Mining Flat Type Chain Connector Units Based on CAE

ANSYS finite element software was utilized to simulate contact non-linear finite element analysis of chain connector for enhancing the structure strength and working life and productivity and manufacture craftwork of the existed ladder-type chain connector. Static and dynamic experiments were carried on several samples to test the broken positions of the chain connectors. The simulation results show that the main part of stress concentration is in teeth roots; experimental results also show that the teeth roots are the fragile parts in the chain connector. So experimental results conform to the results of simulation, it is reasonable for the simulation of contact non-linear finite element analysis of chain connector by ANSYS software. Then a structure of cambered surface tooth is promoted to enhance the strength and life of teeth parts, and petal-type clamps structure is adopted, that can carry out volume-producing to improve the productivity and processing precision.

Study on Manufacture Technology for Enhancing the Life of Mining Flat Type Chain Connector Units

To enhance the structure strength and working life of the existing ladder-type chain connector, and chain connector productivity and manufacture craftwork. The ANSYS finite element software is utilized to simulate contact non-linear finite element analysis of ladder type chain connector. And the static and dynamic experiments are carried on several samples. Finite element simulation results show that the main part of stress concentration is in teeth roots; experiments results show that the teeth roots are the fragile parts in the chain connector, the results of finite element analysis is conformed to the results of the experiments, thus that the ANSYS finite element software is utilized to simulate contact non-linear finite element analysis of chain connector is reasonable. Because of the shortcoming of straight tooth chain connector, then promoted a chain connector of cambered surface tooth structure. Through the analysis, it shows that cambered surface can augment the contact areas in teeth, and prevent partial loading in teeth meshing. When chain connector manufactured, clamping tongs are quite complex, but the petal-type clamps structures are adopted, that can carry out volume-producing, thereby, and the productivity and processing precision are improved.

The Non-Linear Contact Finite Element Analysis of Seal Structure on Large Scale Cutting Tube Machine

According to structural feature and seal requirement for large scale cutting tube machine, the non-standard rubber lip seal ring was self-designed. The nonlinear finite element contact analysis was utilized to model, calculate and optimize the structure of the lip seal ring, so as to improve the seal performance of the lip-shaped seal ring, and to determine the criterion for failure of seal performance of the lip seal ring, therefore to lay a foundation for the optimal design and performance research of the lip seal ring. According to the actual working pressure for the cutting tube machine, the stress and deformation for the lip seal ring were simulated. It has been testified by the practical use that the finite element analysis is correct. The method to optimal design of the seal structure with finite element analysis is feasible.

On the Thermal–Mechanical Behaviors of a Novel Nanowire-Based Anisotropic Conductive Film Technology

Extensive understanding and management of the thermal-mechanical characteristics of novel packaging designs during the bonding process are indispensable to the realization of the technologies. Thus, this paper attempts to explore the bonding process-induced thermal-mechanical behaviors of an advanced flip chip (FC) electronic packaging. FC packaging employs a novel anisotropic conductive film, which is a thin composite film composed of polymer matrix and thousands of millions of highly oriented, 1-D silver (Ag) nanowires on the scale of 200 nanometers in diameter. For carrying out the process simulation, a process-dependent finite element (FE) simulation methodology that integrates both thermal and nonlinear contact FE analyses and a special meshing scheme is applied. The material properties of the nanoscale Ag wires are first explored using molecular dynamics (MD) simulations. By the characterized material properties of the Ag nanowires, the effective material properties of the composite film are derived through two theoretical approaches: 1) the rule-of-mixture (ROM) technique and 2) the proposed FE method-based approach. The predicted results by these two approaches are extensively compared with each other to examine the feasibility of using the widely used ROM technique for such cases. In addition, the validity of the proposed process-dependent FE simulation methodology is also confirmed through three experiments: 1) micro-thermocouple measurement of temperature; 2) Twyman-Green Moire interferometry measurement of out-of-plane deformations; and 3) portable engineering Moire interferometry measurement of in-plane deformations. Throughout the investigation, the effectiveness of the novel interconnect technology is demonstrated. Good agreement with the experiments is also obtained. It is found that the technology may ensure good electrical performance and structural integrity, not only at room temperature but even at elevated temperature, based on its substantial contact stresses but minor peeling stresses on the bonding line, together with a moderate, process-induced warpage on the substrate.