scholarly journals Numerical Analysis of the Cross-Wedge of a Hollow Rail Axle

2020 ◽  
Vol 14 (1) ◽  
pp. 145-153 ◽  
Author(s):  
Zbigniew Pater ◽  
Konrad Lis ◽  
Patrycja Walczuk-Gągała
Keyword(s):  
Numerical Analysis ◽  
The Cross

Large-scale fatigue tests on prestressed concrete beams

2021 ◽  
Author(s):  
Dennis Birkner ◽  
Steffen Marx
Keyword(s):  
Numerical Analysis ◽  
Cross Section ◽  
Prestressed Concrete ◽  
Large Scale ◽  
Concrete Beams ◽  
Fatigue Loading ◽  
Fatigue Tests ◽  
Beam Specimen ◽  
The Cross ◽  
Number Of Cycles

<p>For a better estimation of the fatigue lifetime of real structures, tests on large-scale beam specimens are more suitable than on common cylindrical specimens, since effects like local stiffness changes and stress redistributions can be reproduced more realistically. This article presents an experimental setup for large-scale concrete beams subjected to fatigue loading. Additionally, the fatigue tests are simulated with a numerical model. The results of the numerical analysis show a successively increasing damage propagating from the edge into the inner part of the cross-section in the mid span with increasing number of cycles. This results in stress redistributions which extend the lifetime of the structure. The evaluation of the experimental investigation on the first beam specimen shows a larger stiffness degradation at the upper edge than in the centre of the cross-section as well as increasing strains at this location. This matches the expected effects from the numerical analysis.</p>

scholarly journals Numerical Analysis of the Cross-Wedge Rolling Process by Means of Three Tools of Stepped Shafts From Aluminum Alloy 7075

2015 ◽  
Vol 60 (1) ◽  
pp. 433-435 ◽  
Author(s):  
J. Bartnicki ◽  
J. Tomczak ◽  
Z. Pater
Keyword(s):  
Aluminum Alloy ◽  
Numerical Analysis ◽  
Crucial Role ◽  
Rolling Process ◽  
Numerical Calculations ◽  
Cross Wedge Rolling ◽  
Damage Criterion ◽  
Designed Experiment ◽  
The Cross ◽  
Aluminum Alloy 7075

Abstract This paper presents results of numerical calculations for the rolling process by means of three tools of stepped shafts from aluminum alloy 7075. Forming with the usage of tools with three different wedge spreading angles underwent analysis. In the paper, the obtained distributions of stresses, strains and Cockcroft-Latham damage criterion were given. Moreover, the influence of the wedge spreading angle on shape faults presence in the obtained product was determined. At the same time, the force parameters, which play a crucial role in the designed experiment, were analyzed.

Numerical Analysis on a New Type Cross-Shaped Frame Joint of Steel Reinforced Concrete Special-Shaped Column

2013 ◽  
Vol 351-352 ◽  
pp. 969-974
Author(s):  
Xing Xian Zhang ◽  
Wen Pan
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Bearing Capacity ◽  
Shear Capacity ◽  
Frame Structure ◽  
Intensity Scale ◽  
Steel Reinforced Concrete ◽  
New Type ◽  
The Cross ◽  
Specially Shaped Column

In order to facilitate the construction, this paper presents a new type of cross-shaped frame joint of steel reinforced concrete special-shaped column, and the cross-shaped frame joint of new type of specially-shaped column is the regular concrete joint which is added acre steel-shaped steel. Numerical analysis is conducted on a regular concrete cross-shaped frame joint of specially-shaped column of a frame structure in the region with intensity 8 of Chinese intensity scale, and the joint of corresponding new type of specially-shaped column of the same structure, to obtain the conclusion that when the new type of cross-shaped frame joint of steel reinforced concrete special-shaped column is 6% in steel ratio, the ultimate bearing capacity of joint relative to the RC nodes can improve 34.5%.which shows that the cross-shaped frame joint of new type of specially-shaped column can not only has the advantages of convenient construction, accelerate the construction speed, and the shear capacity also has safeguard.

Temperature Field Numerical Analysis of Different Freeze Pipe Spacing of Vertical Frozen Soil Wall Reinforcement at Shield Shaft

2014 ◽  
Vol 580-583 ◽  
pp. 738-741
Author(s):  
Jun Hu ◽  
Bao Shi Jiang ◽  
Hui Zeng ◽  
Ya Nan Chen ◽  
Yun Yun Zhu
Keyword(s):  
Temperature Field ◽  
Numerical Analysis ◽  
Distribution Patterns ◽  
Frozen Soil ◽  
Soil Reinforcement ◽  
Shield Tunnel ◽  
Analysis Software ◽  
Key Issues ◽  
Frozen Wall ◽  
The Cross

Determining the freezing pipe spacing, the freezing reinforcement required range and method, acquiring the development and distribution patterns of frozen soil wall temperature field are the key issues needed to be addressed when using vertical freezing method for the soil reinforcement at shield shaft. Based on the shield launching project of the cross-river shield tunnel of Nanjing subway line 10 and the finite element numerical analysis software, the development and distribution patterns of different distance between freezing pipes of the vertical frozen wall are studied. The numerical simulation shows that, it is feasible to use the numerical model to simulate the temperature field of vertical frozen wall. Decreasing the distance between freezing pipes causes a greater impact on the temperature field. When freezing pipe spacing increases to 0.1m, frozen wall cross-lap time increases of about 1 day. With the freezing pipe spacing increasing, the cross-lap time increases linearly. The temperature of frozen wall decreases with the distance between freezing pipes decreasing, and the strength of frozen wall is more uniform. Results and conclusions form this research may play a useful role to aid designs of similar projects in future.

scholarly journals Numerical analysis of thermal deformation and residual stress in automotive muffler by MIG welding

2018 ◽  
Vol 5 (4) ◽  
pp. 382-390 ◽  
Author(s):  
S.H. Lee ◽  
E.S. Kim ◽  
J.Y. Park ◽  
J. Choi
Keyword(s):  
Residual Stress ◽  
Numerical Analysis ◽  
Cross Section ◽  
Molten Pool ◽  
Thermal Deformation ◽  
Welding Process ◽  
Experimental Results ◽  
Welding Deformation ◽  
Mig Welding ◽  
The Cross

Abstract In the automotive industry, metal inert gas (MIG) of welding technology is widely used for automotive muffler fabrication. However, the muffler is distorted by thermal deformation during the welding process. In this paper, the prediction of MIG welding-induced deformation and residual stress are simulated by SYSWELD software. The cross-section shapes of the molten pool predicted by the numerical analysis are compared to the experimental results. In the results of the stress, while compressive stresses are produced in regions away from the weld, high tensile stresses are produced in regions near the weld. Deformation values are calculated as 2.5 mm. The location of the actual welding deformation was similar to the experimental results. Based on the results, the methods to optimize the welding procedure will be provided by SYSWELD to improve muffler productivity. Highlights The prediction of MIG welding-induced deformation and residual stress are simulated by SYSWELD software. The cross-section shapes of the molten pool predicted by the numerical analysis are compared to the experimental results. The location of the actual welding deformation are similar to the experimental results. Based on the results, the methods will be provided by SYSWELD to improve muffler productivity.

scholarly journals Correlation image system 3D DANTEC as a modern system for measuring deformation

2019 ◽  
Vol 254 ◽  
pp. 05006
Author(s):  
Tomasz Domański
Keyword(s):  
Numerical Analysis ◽  
Cross Section ◽  
Image Correlation ◽  
3D Image ◽  
Image System ◽  
Contact Measurement ◽  
Correlation Image ◽  
Modern System ◽  
Correlation System ◽  
The Cross

The work presents the possibilities created by the multi-camera 3D image correlation system. The experience is based on non-contact measurement of displacements and deformations. The measurement was used basically to estimate the deflection line of the bending beams and values of strains and displacements at various points of the cross-section. The measurement was carried out by tracking the displacements of the prepared surface of the sample. The results of the numerical analysis were also presented, which were compared with the experience carried out on the measurement stand.

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