scholarly journals Shear Characteristic Changes in Blended Rubber of Elastomeric Bearings due to Aging

2021 ◽  
Vol 21 (6) ◽  
pp. 247-255
Author(s):  
Changho Sun ◽  
Ickhyun Kim
Keyword(s):  
Mechanical Model ◽  
Maximum Stress ◽  
Shear Stiffness ◽  
Stress And Strain ◽  
Elastomeric Bearings ◽  
Vibration Period ◽  
Service Period ◽  
Seismic Force ◽  
Shear Characteristic ◽  
Rubber Bearings

Rubber bearings are widely used for seismic retrofit of bridges because they reduce the seismic force by making the vibration period of the bridge longer and distributing the seismic force to all the piers. However, they have the disadvantage of being easily aged compared to steel bearings as well as having variations in the shear stiffness. The shear characteristic changes in the blended rubber for the rubber bearings were analyzed, specifically, the aging accelerated by heat. The higher the aging temperature and longer the exposure time, the greater is the maximum stress and strain at that time, and the greater is the shear stiffness. This implies that the seismic performance gradually deteriorates due to aging as the service period becomes longer. This can provide the basis for the mechanical model of the aging bearing.

Study on Stress and Strain of Anchorage Using Finite Element Method

2013 ◽  
Vol 325-326 ◽  
pp. 1314-1317
Author(s):  
Cong Sheng Chen ◽  
Ping He ◽  
Cheng Yong Wang ◽  
Xue Hui Chen ◽  
Lei Huang ◽  
...  
Keyword(s):  
Finite Element ◽  
Strain Distribution ◽  
Maximum Stress ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Integrated Modeling ◽  
Stress And Strain ◽  
Steel Strand ◽  
Prestressed State ◽  
Stress And Strain Distribution

Three-dimensional integrated modeling method and the numerical simulation of elastoplastic finite element are adopted in the paper. The mechanical response of the five holes anchorage is analyzed in certain prestressed state. The stress and strain distribution information of the anchor ring, clip and steel strand is obtained respectively, and the structure safety is discussed by investigating on the maximum stress and strain.

scholarly journals Finite Element Analysis of Needle Insertion Angle in Insulin Therapy

2019 ◽  
Vol 16 (4) ◽  
pp. 7512-7523
Author(s):  
Syakirah Mohamed Amin ◽  
Muhammad Hanif Ramlee ◽  
Hadafi Fitri Mohd Latip ◽  
Gan Hong Seng ◽  
Mohammed Rafiq Abdul Kadir
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Insulin Therapy ◽  
Maximum Stress ◽  
Three Dimensional ◽  
Needle Insertion ◽  
Stress And Strain ◽  
Medical Doctors ◽  
Element Analysis ◽  
Biomechanical Evaluation

Millions in the world suffering diabetes mellitus depends on insulin therapy to control their blood glucose level daily. However, the painful daily injections they need to take could lead to other complications if it is not done correctly. To date, it is suggested by many researchers and medical doctors that the needles should be inserted at any angles of 90º or 45º. Nevertheless, this recommendation has not been supported by clinical or biomechanical evaluation. Hence, this study evaluates the needle insertion for insulin therapy to find the favourable angles in order to reduce injury and pain onto the skin. Finite element analysis was done by  simulating the injection of three-dimensional (3D) needle model into a 3D skin model. The insertions were simulated at two different angles, which are 45ºand 90º with two different lengths of needles; 4 mm and 6 mm. This study concluded the favourable angle for 4 mm needle to be 90º while 6 mm needle was best to be inserted at 45º as these angles exerted the least maximum stress and strain onto the skin.

Evaluation of Optimal Conditions for D-Tube Brazing

2008 ◽  
Vol 33-37 ◽  
pp. 1345-1350 ◽  
Author(s):  
W.K. Joo ◽  
Yi Qi Wang ◽  
H.T. Yang ◽  
W.C. Lee ◽  
C.Y. Sim ◽  
...  
Keyword(s):  
Tensile Test ◽  
Base Metal ◽  
Maximum Stress ◽  
Filler Metal ◽  
Metal Layer ◽  
Stress And Strain ◽  
Base Metals ◽  
Element Analysis ◽  
Better Than ◽  
Counter Diffusion

The microstructures and mechanical properties of OFHC copper/STKM 11A for D-tube joints brazed using BAg filler metal at 870 °C for 20 minutes in NH3 atmospheres were performed. Interfacial microstructures were observed in reaction layer. A brazing strength causes of decline with defects of pin hole and base metal by lack of penetration. In tensile test, the properties of joints clearance of 0.01mm are better than other joints clearance that has yield strength of elasticity area with the brazing length of 2.5mm, and also suitable for the case of brazing length of 5.0mm. According to the results of FEA (finite element analysis) on the tensile test, the maximum stress and strain were generated apart from the interface in large deformation. Diffused layer was formed by counter diffusion action of base metal and filler metal layer, and crack between two base metals was not discovered. This is the main reason that fracture of test piece does not appear in copper base metal, and brazing department forms good junctures.

The Feasibility Analysis of the Double-Curved Positive Displacement Motor (PDM) Into Casing

2010 ◽  
Vol 143-144 ◽  
pp. 1102-1106
Author(s):  
Xiao Hua Zhu ◽  
Yuan Gao ◽  
Shao Hu Liu ◽  
Hua Tong
Keyword(s):  
Stress Distribution ◽  
Yield Strength ◽  
Mechanical Model ◽  
Maximum Stress ◽  
Feasibility Analysis ◽  
Positive Displacement ◽  
Common Structure ◽  
Simulation Results ◽  
The Law ◽  
Self Gravity

To study the feasibility of double-curved PDM into casing, the mechanical model of Φ172 mm double-curved PDM into Φ244 mm straight casing is established. The effect of different structure corners on the feasibility is analyzed for the PDM into casing; and the law of stress distribution is discussed in the paper. The simulation results show that the Φ172 mm double-curved PDM can enter Φ244 mm straight casing favorably by self-gravity when the first structure bend is equal to 1° and the second structure bend is equal to or less than 1.5°. When the second structure corner is equal to or more than 1.75°, PDM needs extra to enter into casing. Within the bounds of common structure corners,when the PDM into casing, the maximum stress value of the double-curved PDM is much lower than yield strength.

Studies of road constructions of macadam on the shear stress

10.12737/1771 ◽  
2013 ◽  
Vol 3 (3) ◽  
pp. 66-69
Author(s):  
Артемьев ◽  
Vladislav Artemev
Keyword(s):  
Shear Stress ◽  
Building Materials ◽  
Maximum Stress ◽  
Stress And Strain ◽  
Road Building ◽  
Local Road

Analysis of calculation of stress and strain of pavement with macadam by the method of ODN 218.046–01 is given. The main objective of strengthening local road-building materials is to identify areas of maximum stress, which should be stren-gthened with the use of geosynthetic or binding materials. As a result zones of maximum stress in the two-layer pavement are revealed. The dependences of the shear stress from the increase in the thickness of pavement with an increase in gravel or sand layers are defined.

Models of maximum stress and strain of zebrafish embryos under indentation

2009 ◽  
Vol 42 (5) ◽  
pp. 620-625 ◽  
Author(s):  
Zhe Lu ◽  
Peter C.Y. Chen ◽  
Hong Luo ◽  
Joohoo Nam ◽  
Ruowen Ge ◽  
...  
Keyword(s):  
Maximum Stress ◽  
Stress And Strain ◽  
Zebrafish Embryos

The Static Analysis of the Parallel Bars of the Crankshaft of a Mini Air Compressor on ANSYS

2013 ◽  
Vol 397-400 ◽  
pp. 344-354
Author(s):  
Yao Bing Wei ◽  
Zhen Zhen Qu
Keyword(s):  
Static Analysis ◽  
Mechanical Model ◽  
Working Condition ◽  
Stress And Strain ◽  
Reciprocating Compressor ◽  
Static Characteristics ◽  
Connecting Rod ◽  
Air Compressor

Mechanical model of crankshaft and connecting rod mechanism of reciprocating compressor was built. Then the order of stress was obtained every ten degrees while crankshaft turning. The larger stress of crankshaft initial turnings was utilized to calculate the whole model and the unreliable region and destructive working condition then was determined. The situation was simulated with ANALYS and the static characteristics, i.e. stress and strain, of the crankshaft was also obtained. The simulated results testify the analysis and the results of the paper have great value for reference when designing crankshafts.

ANSYS-Based Finite Element of Rear Frame in Underground Transport Vehicle

2012 ◽  
Vol 605-607 ◽  
pp. 691-694
Author(s):  
Li Sun
Keyword(s):  
Finite Element ◽  
Theoretical Basis ◽  
Maximum Stress ◽  
Geometrical Model ◽  
Stress And Strain ◽  
Allowable Stress ◽  
Fem Model ◽  
Transport Vehicle ◽  
Design Requirements ◽  
Set Up

Rear frame is an important component of underground transport vehicle, used to carry different functional devices. This paper took rear frame as a research object. First of all, software Proe was used to set up geometrical model; secondly, software ANSYS was used to establish a FEM model to grid and set boundary conditions, and then analyzed rear frame stress and strain in working speed. The results showed that the deformation of rear frame is very small, meets the design requirements; the maximum stress of rear frame is far less than the allowable stress, which meets the strength requirements. It provides important theoretical basis for rear frame’s design.

Three Dimensional Thermo-Mechanical Model of Different Thermocouple Embedded Modes Analysis

2011 ◽  
Vol 291-294 ◽  
pp. 263-268
Author(s):  
Li Gen Sun ◽  
Jia Quan Zhang
Keyword(s):  
Temperature Field ◽  
Mechanical Model ◽  
Three Dimensional ◽  
Point Of View ◽  
Stress And Strain ◽  
Back Side ◽  
Maximum Stresses

The embedded thermocouples have been analyzed with the consideration of their temperature effectiveness and the life of mould plates. Three dimensional FEM models have been adopted to study the effect of different installation of the thermocouples. The thermocouples installation methods, whatever from the back side of the plates or from the top or bottom, have been observed with little effect on the temperature field of the copper plates. But the effective Mises stress and strain are influenced obviously. The maximum stresses have been observed in the area of thermocouples channel with holes from back side of the plates. From this point of view, the holes from top or bottom of the plates are more reasonable.

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