Finite Element Analysis of Tire/Rim Interface Forces Under Braking and Cornering Loads

1992 ◽  
Vol 20 (2) ◽  
pp. 83-105 ◽  
Author(s):  
J. P. Jeusette ◽  
M. Theves
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Contact Pressure ◽  
Element Model ◽  
Shear Stresses ◽  
Detailed Knowledge ◽  
Stress Distributions ◽  
Element Analysis ◽  
Plane Shear ◽  
Normal Contact

Abstract During vehicle braking and cornering, the tire's footprint region may see high normal contact pressures and in-plane shear stresses. The corresponding resultant forces and moments are transferred to the wheel. The optimal design of the tire bead area and the wheel requires a detailed knowledge of the contact pressure and shear stress distributions at the tire/rim interface. In this study, the forces and moments obtained from the simulation of a vehicle in stationary braking/cornering conditions are applied to a quasi-static braking/cornering tire finite element model. Detailed contact pressure and shear stress distributions at the tire/rim interface are computed for heavy braking and cornering maneuvers.

scholarly journals Preliminary results on the effects of orthopedic implant stiffness fixed to the cut end of the femur on the stress at the stump-prosthetic interface

2021 ◽  
Vol 15 (57) ◽  
pp. 160-168
Author(s):  
Ismail Boudjemaa ◽  
A. Sahli ◽  
A. Benkhettou ◽  
S. Benbarek
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Elastic Modulus ◽  
Contact Pressure ◽  
Element Model ◽  
Shear Stresses ◽  
Fe Model ◽  
Orthopedic Implant ◽  
Skin Breakdown ◽  
Patients Experience

A lot of trans-femoral amputation patients experience skin breakdown due to the pressures and shear stresses in the stump-prosthesis interface. In this study, a finite element model was employed to investigate the stresses at the stump interface in the case of an orthopedic implant fixed to the cut end of the femur. By changing the stiffness of this implant, we aim to see how the stiffness of this implant affects the stresses in the interface between the amputated limb and the prosthesis. To find out the effects of implant stiffness, five values for the elastic modulus, ranging from 0.1 to 0.5 Mpa, with an interval of 0.1 Mpa were employed in the implant structure of the FE model. Obtained results show that the implant played important role in reducing the stresses at the stump-prosthesis interface where the contact pressure did not exceed 53 Kpa and 17.3 Kpa for shear stress in the stiffer case of an implant, while the contact pressure in the case of femur without implant exceeded 79Kpa and 42 Kpa for shear stress. We also noted that the intensity of the contact pressure and the shear stress is proportional to the stiffness of the implant, as the greater the implant stiffness, the higher the peak of these stresses.

scholarly journals Comparison of Tooth- and Bone-Borne Appliances on the Stress Distributions and Displacement Patterns in the Facial Skeleton in Surgically Assisted Rapid Maxillary Expansion—A Finite Element Analysis (FEA) Study

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1152
Author(s):  
Rafał Nowak ◽  
Anna Olejnik ◽  
Hanna Gerber ◽  
Roman Frątczak ◽  
Ewa Zawiślak
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Rapid Maxillary Expansion ◽  
Stress Distributions ◽  
Maxillary Expansion ◽  
Facial Skeleton ◽  
Element Analysis ◽  
Maxillary Constriction

The aim of this study was to compare the reduced stresses according to Huber’s hypothesis and the displacement pattern in the region of the facial skeleton using a tooth- or bone-borne appliance in surgically assisted rapid maxillary expansion (SARME). In the current literature, the lack of updated reports about biomechanical effects in bone-borne appliances used in SARME is noticeable. Finite element analysis (FEA) was used for this study. Six facial skeleton models were created, five with various variants of osteotomy and one without osteotomy. Two different appliances for maxillary expansion were used for each model. The three-dimensional (3D) model of the facial skeleton was created on the basis of spiral computed tomography (CT) scans of a 32-year-old patient with maxillary constriction. The finite element model was built using ANSYS 15.0 software, in which the computations were carried out. Stress distributions and displacement values along the 3D axes were found for each osteotomy variant with the expansion of the tooth- and the bone-borne devices at a level of 0.5 mm. The investigation showed that in the case of a full osteotomy of the maxilla, as described by Bell and Epker in 1976, the method of fixing the appliance for maxillary expansion had no impact on the distribution of the reduced stresses according to Huber’s hypothesis in the facial skeleton. In the case of the bone-borne appliance, the load on the teeth, which may lead to periodontal and orthodontic complications, was eliminated. In the case of a full osteotomy of the maxilla, displacements in the buccolingual direction for all the variables of the bone-borne appliance were slightly bigger than for the tooth-borne appliance.

Effect of Compressive and Shear Deformation of 2.5D Preform on its Stiffness of Composites

2019 ◽  
Vol 943 ◽  
pp. 75-80
Author(s):  
Fang Bin Lin ◽  
Ying Dai ◽  
Han Yang Li ◽  
Yang Qu ◽  
Wen Xiao Li
Keyword(s):  
Finite Element ◽  
Shear Deformation ◽  
Cell Model ◽  
Deformation Mode ◽  
Element Model ◽  
Tensile Tests ◽  
Woven Composites ◽  
Forming Process ◽  
Element Analysis ◽  
Plane Shear

Transverse compaction and in-plane shear deformartion are the dominative deformation mode for woven preform during forming process. A full finite element model of the 2.5D woven composites has been established by the computed tomography (CT) in this paper. Based on the energy method, the effective orthotropic/anisotropic stiffness coefficientsCijare calculated by performing a finite element analysis (FEA) of this full cell model. Using this model, the effects of the compaction and shear deformation of the 2.5D woven preform on the composites stiffness are investigated in detail. Compared the results of the static tensile tests, the rationality of the model and the method is verified.

Combined Effects of Tube Projection, Initial Tube-Tubesheet Clearance, and Tube Material Strain Hardening on Rolled Joint Strength

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
N. Merah ◽  
A. Al-Aboodi ◽  
A. N. Shuaib ◽  
Y. Al-Nassar ◽  
S. S. Al-Anizi
Keyword(s):  
Finite Element ◽  
Strain Hardening ◽  
Contact Pressure ◽  
Joint Strength ◽  
Element Model ◽  
Design Parameters ◽  
Radial Clearance ◽  
Tube Material ◽  
Element Analysis ◽  
Interfacial Pressure

The tube-to-tubesheet joint strength is measured in terms of interfacial pressure between the tube’s outer surface and tubesheet bore. The strength of a rolled joint is influenced by several design parameters, including the type of tube and tubesheet materials, initial tube projection, and the initial radial clearance between the tube and tubesheet, among other factors. This paper uses finite element analysis (FEA) to evaluate the effect of several parameters on the strength of rolled joints having large overtolerances, a situation that applies to used equipment. An axisymmetric finite element model based on the sleeve diameter and rigid tube expanding roller concepts was used to analyze the effects of tube projection, initial tube-tubesheet clearance, and tube material strain-hardening property on the deformation behavior of the rolled tube and on the strength of the tube-tubesheet joint. The FEA results show that for zero tube projection (flush) the initial clearance effect is dependent on the strain-hardening capability of the tube material. For low strain-hardening tube material the interfacial pressure remains constant well above the Tubular Exchanger Manufacturer’s Association maximum overtolerance. A drastic reduction in joint strength is observed at high values of radial clearances. The cut-off clearance (clearance at which the interfacial pressure starts to drop) is found to vary linearly with the tube material hardening level, and the contact stress increases slightly for moderate strain-hardening tube materials but shows lower cut-off clearance levels. Furthermore, with flush tubes the maximum contact pressure occurs close to the secondary face (at the end of rolling) while for joints with initial tube projection the contact pressure shows two maxima occurring near the primary and the secondary faces. This is attributed to the presence of two elbows in tube deformation near the primary and secondary faces. The average interfacial pressure increased with increasing projection length for all clearances. Tube material strain hardening enhances the interfacial pressure in a similar fashion for all initial tube projection lengths considered in the analysis.

Finite Element Analysis of Frame of Dump Truck

2015 ◽  
Vol 733 ◽  
pp. 591-594
Author(s):  
Yong Zhen Zhu ◽  
Kuo Yang ◽  
Qi Yang ◽  
Yun De Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
3D Model ◽  
Element Model ◽  
Dump Truck ◽  
Stress Distributions ◽  
Improved Method ◽  
Element Analysis ◽  
Finite Element Software ◽  
The Finite Element Model

The CAD software was used to establish 3D model of frame of dump truck, and the finite element model was established through Hyper Mesh. The stress distributions of the frame in vertical accelerating, turning, twisting and climbing conditions were computed through finite element software when the dump truck was loaded 80t. The result is consistent with the actual situation of the frame, which proved that the approach of finite element analysis is feasible. And we proposed the improved method of the frame according to finite element results.

Deformation and Stress Analysis of Supported Buttock Contact

1994 ◽  
Vol 208 (1) ◽  
pp. 9-17 ◽  
Author(s):  
P A Dabnichki ◽  
A D Crocombe ◽  
S C Hughes
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Shear Stress ◽  
Contact Problem ◽  
Stress Analysis ◽  
Stress Distributions ◽  
Body Segment ◽  
Element Analysis ◽  
Linear Finite Element ◽  
Support Surfaces

Non-linear finite element analysis has been used to investigate the contact problem between a buttock and a cushion of varying properties. The buttock tissue has been modelled on the macroscale by assuming it to be a hyperelastic (rubber-like) material with properties that correspond to the overall buttock response. Both rigid and flexible cushions have been considered. The contact between the cushion and the buttock has been modelled assuming both friction and friction-free conditions. The effect of these parameters on the buttock-cushion deformation and the tissue compressive and shear stress distributions have been presented. This study forms part of work towards the development of body segment simulators for use in investigations of seating and other support surfaces.

Shot Peen Forming Sheet Metal: Finite Element Prediction of Deformed Shape

1996 ◽  
Vol 210 (4) ◽  
pp. 361-366 ◽  
Author(s):  
L V Grasty ◽  
C Andrew
Keyword(s):  
Finite Element ◽  
Computing Time ◽  
Element Model ◽  
Stress Distributions ◽  
Trial And Error ◽  
Element Analysis ◽  
Metal Parts ◽  
Peen Forming ◽  
Commercially Important ◽  
Finite Element Prediction

Shot peen forming is a production process used to create curved metal parts from sheet. It is commercially important despite the fact that its mechanisms are not fully understood; peen forming programmes are currently generated using experience and trial and error. The purpose of this work is to increase the predictability and range of application of the process by advancing its understanding. Finite element analysis proved to be a satisfactory procedure for studying shot peen forming. The stress distribution in a sheet arising from multiple indentations, as occur in shot peen forming, was modelled. A technique of squeezing the upper layers of a finite element model was shown to be a good simulation of the stress distributions resulting from shot peen forming, and provided a much more tractable analysis with respect to computing time and resources.

Finite Element Analysis of an Involute Gear Drive Considering Friction Effects

1989 ◽  
Vol 111 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Wen-Hwa Chen ◽  
Pwu Tsai
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Element Model ◽  
Stress Distributions ◽  
Element Analysis ◽  
Gear Drive ◽  
Involute Gear ◽  
Torque Transmission ◽  
Effective Friction

A rigorous and accurate finite element model has been developed and applied to deal with an involute gear drive considering friction effects. The loss of torque transmission due to friction and effective friction coefficient are evaluated and computed. The rolling and/or sliding behaviors between two engaged gears during an engagement cycle are also discussed. The patterns of stress distributions and deformations of two contact gears at various engagement angles are then presented. Excellent correlations between the calculated results and referenced experimental data can be found.

Coupled Thermal Analysis on Carbide Anvil of Cubic Press

2014 ◽  
Vol 852 ◽  
pp. 629-633
Author(s):  
Xian Jun Zhou ◽  
Zhong Wen Xu ◽  
Ren Quan Chen ◽  
Shao Ping Li
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Shear Stress ◽  
Element Model ◽  
Heat Transfer Analysis ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Material Defects ◽  
Indirect Coupling ◽  
Von Mises

Based on finite element analysis software ANSYS, the 3D contact finite element model of carbide anvil, steel ring and cushion block were built to make heat transfer analysis, and the temperature field distribution was obtained. The indirect coupling thermal analysis of carbide anvil, steel ring and cushion block were made regarding as a whole, the Von Mises stress nephogram of them and the shear stress nephogram of carbide anvil were displayed. The stress nephogram revealed that it was liable to fracture on the edge of top surface under high pressure status, and it was also proven that the main reason of fracture was the yield of internal material defects under the action of shear stress.

Stresses and Strains in the Medial Meniscus of an ACL Deficient Knee under Anterior Loading: A Finite Element Analysis with Image-Based Experimental Validation

2005 ◽  
Vol 128 (1) ◽  
pp. 135-141 ◽  
Author(s):  
Jiang Yao ◽  
Jason Snibbe ◽  
Michael Maloney ◽  
Amy L. Lerner
Keyword(s):  
Finite Element ◽  
Ex Vivo ◽  
Element Model ◽  
Shear Stresses ◽  
Element Analysis ◽  
Knee Motion ◽  
Tissue Properties ◽  
Meniscal Tissue ◽  
Acl Deficient ◽  
Deficient Knee

The menisci are believed to play a stabilizing role in the ACL-deficient knee, and are known to be at risk for degradation in the chronically unstable knee. Much of our understanding of this behavior is based on ex vivo experiments or clinical studies in which we must infer the function of the menisci from external measures of knee motion. More recently, studies using magnetic resonance (MR) imaging have provided more clear visualization of the motion and deformation of the menisci within the tibio-femoral articulation. In this study, we used such images to generate a finite element model of the medial compartment of an ACL-deficient knee to reproduce the meniscal position under anterior loads of 45, 76, and 107N. Comparisons of the model predictions to boundaries digitized from images acquired in the loaded states demonstrated general agreement, with errors localized to the anterior and posterior regions of the meniscus, areas in which large shear stresses were present. Our model results suggest that further attention is needed to characterize material properties of the peripheral and horn attachments. Although overall translation of the meniscus was predicted well, the changes in curvature and distortion of the meniscus in the posterior region were not captured by the model, suggesting the need for refinement of meniscal tissue properties.

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