scholarly journals Contact element use peculiarities in the numerical model construction of the reinforcing bar force interaction with an anchoring field

2020 ◽  
Vol 7 (3) ◽  
Author(s):  
Igor Belutsky ◽  
Pavel Grinev ◽  
Vladimir Iovenko
Keyword(s):  
Model Development ◽  
Element Model ◽  
Contact Layer ◽  
Contact Element ◽  
Shear Stresses ◽  
Metallic Composite ◽  
Reinforcing Bar ◽  
Elastic Module ◽  
Prestressing Force ◽  
Composite Reinforcement

The application experience of non-metallic composite materials is quite wide in foreign countries, as well as systematized and assembled into a single database. In Russia, since the necessary computing resources have become more relevant and accessible for design organizations, independent researchers, and graduate students of higher educational institutions, this question resurfaced only in the last decade. As well as benefits, non-metallic composite reinforcement has its disadvantages, which prevent it from wide usage in structures, including a relatively low elastic module, as well as the inability to bend during installation. To improve the reinforced structures with stressed reinforcement calculation and possible prestressing force loss prediction, the finite element model production has been discussed. This model would allow us to evaluate the damaging shear stresses in the reinforcement region. The bracing formation process in the scope of this model was presented in this article, with the purpose of simulation the contact layer stress-strain state between reinforcement and concrete. The calculation is performed in a linear setting. Model development of a T-section decking component reinforced with a composite reinforcement beam produced via LIRA SAPR software. Exert a force on shank ends that is equivalent to the clamping force when the prestressed reinforcement is released. The authors proposed a selection option of the junction stiffness by stem contact with the anchoring field. The stiffness is assumed to be constant along the entire length of the contact layer. Elastic coefficient variation of the contact layer was performed here. The contact layer is highlighted conditionally as a separate material. A model for three types of materials was discussed. The shear stresses patterns in the contact element region were obtained. The patterns of abutting end reinforcement bars motion are obtained. To create a span element with a pre-tensioned reinforcement, a full-scale experiment was performed, as well as reinforcement abatement. Upon abatement, the retraction was recorded. The retraction results of the shank ends were measured, the values of which are comparable to the numerical motion.

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.

Reduction of Free-Edge Stress Concentration

1985 ◽  
Vol 52 (4) ◽  
pp. 801-805 ◽  
Author(s):  
P. R. Heyliger ◽  
J. N. Reddy
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Free Edge ◽  
Shear Stresses ◽  
Normal Stresses ◽  
Interlaminar Shear ◽  
Three Dimensional Elasticity

A quasi-three dimensional elasticity formulation and associated finite element model for the stress analysis of symmetric laminates with free-edge cap reinforcement are described. Numerical results are presented to show the effect of the reinforcement on the reduction of free-edge stresses. It is observed that the interlaminar normal stresses are reduced considerably more than the interlaminar shear stresses due to the free-edge reinforcement.

A Multi-Modality Image Data Collection Protocol for Full Body Finite Element Model Development

2009 ◽  
Author(s):  
F. Scott Gayzik ◽  
Craig A. Hamilton ◽  
Josh C. Tan ◽  
Craig McNally ◽  
Stefan M. Duma ◽  
...  
Keyword(s):  
Finite Element ◽  
Data Collection ◽  
Finite Element Model ◽  
Model Development ◽  
Image Data ◽  
Element Model ◽  
Full Body

Model Development of the Application of Finite Element – Eigenvalue Method to the Determination of Transient Temperature Field in Functionally Graded Materials

2007 ◽  
Vol 18-19 ◽  
pp. 253-261
Author(s):  
John A. Akpobi ◽  
C.O. Edobor
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Functionally Graded Materials ◽  
Model Development ◽  
Element Model ◽  
Steady State Solution ◽  
Functionally Graded ◽  
Transient Temperature ◽  
Graded Materials ◽  
Eigenvalue Method

In this paper, a finite elment-eigenvalue method is formulated to solve the finite element models of time dependent temperature field problems in non-homogeneous materials such as functionally graded materials (FGMs). The method formulates an eigenvalue problem from the original finite element model and proceeds to calculate the associated eigenvectors from which the solution can be obtained. The results obtained highly accurate and are exponential functions of time which when compared with the exact solution tended fast to the steady state solution.

Research of the effect of changing the ratio of the content of steel and basalt-plastic reinforcement on the strength indicators of beams with hybrid reinforcement

2021 ◽  
Vol 2021 (23) ◽  
pp. 167-177
Author(s):  
Serhii Stoyanovich ◽  
Keyword(s):  
Strain State ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Stress Strain ◽  
Control Series ◽  
Metallic Composite ◽  
Stress Strain State ◽  
Stage Of Development ◽  
Hybrid Reinforcement ◽  
Composite Reinforcement

Introduction.The current stage of development of the construction industry is associated with the introduction of new materials into practice, compared with the «traditional» (steel, concrete, wood) have certain advantages in the form of improved strength, corrosion resistance, etc. These materials include non-metallic composite reinforcement.Problems Statement. The main disadvantage of non-metallic composite reinforcement (except for carbon fiber reinforcement) is significantly lower modulus of elasticity compared to metal reinforcement. This is the reason for the occurrence of excessive deformations in concrete structures, does not ensure the fulfillment of the requirements for the second group of limiting states. One of the ways to reduce the de-formations of concrete structures, without a significant increase in the percentage of reinforcement of the section, is the use of hybrid reinforcement, when reinforcement is performed simultaneously with metal and composite reinforcement. Currently, there is a very limited amount of experimental data on the stress-strain state of structures with such reinforcement.Purpose. Research of the stress-strain state of structures with hybrid reinforcement, establishing its effectiveness and the optimal ratio of the content of metal and composite reinforcement to achieve sat-isfactory strength and stiffness of a concrete structure.Materials and Methods. The work of beams under load, reinforced with basalt-plastic reinforce-ment, metal reinforcement (control series) and with hybrid reinforcement with metal and basalt-plastic re-inforcement simultaneously was researched. To find out the effect of changes in the content of basalt-plas-tic reinforcement in relation to metal on the performance of beams with hybrid reinforcement, various series of samples of beams with different ratios of basalt-plastic and metal reinforcement.Results. On the basis of the conducted studies, the nature of the work and destruction of concrete beams with hybrid reinforcement was assessed depending on the percentage of metal and basalt-plas-tic reinforcement. The strength indicators of concrete beams with hybrid reinforcement were obtained and analyzed. The test results showed that the strength of beams with hybrid reinforcement increased in comparison with beams of the control series and was at the level of beams reinforced with basalt-plastic reinforcement. At the same time, the deflections and crack width of the beams decreased.Conclusion. The use of hybrid reinforcement makes it possible to increase the bearing capacity of concrete beams, depending on the percentage of reinforcement in the section. The determining factors for the strength of beams with hybrid reinforcement are the strength of the concrete in the compressed zone and the percentage of section reinforcement. The optimal percentage of the ratio of metal and basalt reinforcement in concrete beams with hybrid reinforcement is 60 % / 40 %.Keywords:beams with hybrid reinforcement, basaltoplastic reinforcement, steel reinforcement, strength, deformability.

Analytical Method to Estimate Railroad Spike Fastener Stress

2020 ◽  
Vol 2674 (11) ◽  
pp. 379-389 ◽  
Author(s):  
Marcus S. Dersch ◽  
Matheus Trizotto Silva ◽  
J. Riley Edwards ◽  
Arthur de O Lima ◽  
Tom Roadcap
Keyword(s):  
Analytical Method ◽  
Model Development ◽  
Element Model ◽  
Foundation Design ◽  
Deep Foundation ◽  
Cross Sectional ◽  
Field Instrumentation ◽  
Key Variables ◽  
Railroad Safety ◽  
Laterally Loaded

Previous research indicates that spike fastener fatigue failures have led to at least ten derailments since 2000. Given that railroads continue to install fastening systems that have experienced spike failures, methods to quantify the stress state of the spike must be developed. Common approaches to quantify the effect of key variables include laboratory experimentation, field instrumentation, or finite element model development. However, these approaches may be both time and cost prohibitive. An analytical method based on beam on elastic foundation mechanics, similar to the analysis of laterally loaded piles in deep foundation design, was developed to estimate the spike stresses. The outcome is a laboratory-validated analytical approach that generates estimates of spike stress. This analytical model was used to investigate key design criteria (timber modulus, spike cross-sectional area, and load applied) that could be changed to improve the resiliency of the fastening system to increase railroad safety. Another outcome of this study is the development of an instrumented spike that quantifies the spike demands when installed and loaded within a crosstie.

scholarly journals Contact models verification by the finite element model updating method based on the calculation of the sensitivity coefficient

2018 ◽  
Vol 226 ◽  
pp. 02008 ◽  
Author(s):  
Vladimir Zhulev ◽  
Michail Kuts
Keyword(s):  
Model Updating ◽  
Element Model ◽  
Contact Layer ◽  
Sensitivity Coefficient ◽  
Behavior Simulation ◽  
Stiffness Model ◽  
Machined Parts ◽  
Detailed Simulation ◽  
Contact Models ◽  
Fixed Beam

Vibrations, occurring in the cutting process, have significant effect on the accuracy of machined parts. Approaches, based on simplified simulation of parts and units, doesn’t lead to reliable results in dynamic behavior simulation, because they suppose the ideal smoothness of contact surfaces. Detailed simulation of contact layer requires large computational costs and is difficult to perform for most of calculations in mechanical engineering. In this regard, an approach to model the contact layer as a third body with zero thickness, which parameters depends from many factors, particularly from contact pressure, is the most widespread. The experimental method based on the identification of the contact layer is considered in this paper, using the example of a free-fixed beam. The algorithm for determining the stiffness element in the contact layer is based on the sensitivity coefficients calculation. As verification of the method, a comparison was made with the theoretical stiffness model in the contact layer. It’s investigated rigidity function in the region, depending on the natural frequency of the specify with different tightening forces. The obtained data can be used to correctly model the contact layer for dynamic problems.

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