scholarly journals Fatigue Analysis of Aluminum Alloy Wheel Under Radial Load

2012 ◽  
pp. 112-117
Author(s):  
N. Satyanarayana ◽  
Ch. Sambaiah
Keyword(s):  
Shear Stress ◽  
Aluminum Alloy ◽  
Static Condition ◽  
Fatigue Analysis ◽  
Radial Load ◽  
Dimensional Model ◽  
Total Deformation ◽  
3 Dimensional ◽  
Alloy Wheel ◽  
D Model

In this paper a detailed “Fatigue Analysis of Aluminum Alloy Wheel under Radial Load”. During the part of project a static and fatigue analysis of aluminum alloy wheel A356.2 was carried out using FEA package. The 3 dimensional model of the wheel was designed using CATIA. Then the 3-D model was imported into ANSYS using the IGES format. The finite element idealization of this modal was then produced using the 10 node tetrahedron solid element. The analysis was performed in a static condition. This is constrained in all degree of freedom at the PCD and hub portion. The pressure is applied on the rim. We find out the total deformation, alternative stress and shear stress by using FEA software. And also we find out the life, safety factor and damage of alloy wheel by using S-N curve. S-N curve is input for a A.356.2 material.

Application of Parametric Modeling in Optimization Design on Aluminum Alloy Wheels

2012 ◽  
Vol 178-181 ◽  
pp. 2834-2836
Author(s):  
Deng Li Yi
Keyword(s):  
Aluminum Alloy ◽  
Optimization Design ◽  
Three Dimensional ◽  
Parametric Modeling ◽  
Dimensional Model ◽  
Material Consumption ◽  
Three Dimensional Model ◽  
Long Period ◽  
Alloy Wheel

With the development of lightweight car，the applications of aluminum alloy wheels are changed extensively. At present, there are many disadvantages in aluminum alloy wheel profession of my country such as the blindness in design, the long period, material consumption, the high cost and so on. In this paper, the CAD as well as the FEA technology is applied. The parametric three-dimensional model of aluminum alloy wheel is constructed using UG software. Taken the former's thickness and the angle between two formers as variables, the wheels with different sizes and shapes are established. Automobile aluminum alloy wheel hub is built and this is helpful to the development of CAE / CAM in the aluminum alloy wheel design.

scholarly journals Laminar shear stress upregulates endothelial Ca2+-activated K+ channels KCa2.3 and KCa3.1 via a Ca2+/calmodulin-dependent protein kinase kinase/Akt/p300 cascade

2013 ◽  
Vol 305 (4) ◽  
pp. H484-H493 ◽  
Author(s):  
Jun Takai ◽  
Alexandra Santu ◽  
Haifeng Zheng ◽  
Sang Don Koh ◽  
Masanori Ohta ◽  
...  
Keyword(s):  
Shear Stress ◽  
Transcriptional Activation ◽  
Static Condition ◽  
Fold Increase ◽  
Laminar Shear Stress ◽  
Human Coronary Artery ◽  
Intracellular Ca ◽  
Kinase Cascade ◽  
Dependent Protein ◽  
Laminar Shear

In endothelial cells (ECs), Ca2+-activated K+ channels KCa2.3 and KCa3.1 play a crucial role in the regulation of arterial tone via producing NO and endothelium-derived hyperpolarizing factors. Since a rise in intracellular Ca2+ levels and activation of p300 histone acetyltransferase are early EC responses to laminar shear stress (LS) for the transcriptional activation of genes, we examined the role of Ca2+/calmodulin-dependent kinase kinase (CaMKK), the most upstream element of a Ca2+/calmodulin-kinase cascade, and p300 in LS-dependent regulation of KCa2.3 and KCa3.1 in ECs. Exposure to LS (15 dyn/cm2) for 24 h markedly increased KCa2.3 and KCa3.1 mRNA expression in cultured human coronary artery ECs (3.2 ± 0.4 and 45 ± 10 fold increase, respectively; P < 0.05 vs. static condition; n = 8–30), whereas oscillatory shear (OS; ± 5 dyn/cm2 × 1 Hz) moderately increased KCa3.1 but did not affect KCa2.3. Expression of KCa2.1 and KCa2.2 was suppressed under both LS and OS conditions, whereas KCa1.1 was slightly elevated in LS and unchanged in OS. Inhibition of CaMKK attenuated LS-induced increases in the expression and channel activity of KCa2.3 and KCa3.1, and in phosphorylation of Akt (Ser473) and p300 (Ser1834). Inhibition of Akt abolished the upregulation of these channels by diminishing p300 phosphorylation. Consistently, disruption of the interaction of p300 with transcription factors eliminated the induction of these channels. Thus a CaMKK/Akt/p300 cascade plays an important role in LS-dependent induction of KCa2.3 and KCa3.1 expression, thereby regulating EC function and adaptation to hemodynamic changes.

A CAD System for Designers’ Decision Making: An Approach With 2D and 3D Integrated and Hierarchical Assembly Models

1991 ◽  
Author(s):  
S. Minami ◽  
T. Ishida ◽  
S. Yamamoto ◽  
K. Tomita ◽  
M. Odamura
Keyword(s):  
Decision Making ◽  
Computer Aided Design ◽  
Mechanical Design ◽  
Prototype System ◽  
Dimensional Model ◽  
3 Dimensional ◽  
Hierarchical Assembly ◽  
Cad System ◽  
Aided Design ◽  
2D And 3D

Abstract A concept for the initial stage of the mechanical design and its implementation in the computer-aided design (CAD) are presented. The process of decision making in design is: (1) determining an outline of the whole assembly using a 2-dimensional model that is easy to operate; (2) checking the outline using a 3-dimensional model in which it is easy to identify the spatial relationships; (3) determining details of its sub-assemblies or their components using the 2-dimensional model; and (4) checking the details using the 3-dimensional model. The CAD system must provide consistent relationships through all the steps. For that, following functions are implemented in our prototype system: (1) a 2D and 3D integrated model for consistency between 2- and 3-dimensional shapes, (2) a hierarchical assembly model with dimensional constraints for consistency within an assembly and their components, and (3) a check on constraints for consistency between shapes and designers’ intentions. As a result, the system can provide an environment well fitted to the designers’ decision making process.

A Light Weight Compliant Hand Mechanism With High Degrees of Freedom

2005 ◽  
Vol 127 (6) ◽  
pp. 934-945 ◽  
Author(s):  
Jason Potratz ◽  
Jingzhou Yang ◽  
Karim Abdel-Malek ◽  
Esteban Peña Pitarch ◽  
Nicole Grosland
Keyword(s):  
Degrees Of Freedom ◽  
Static Load ◽  
Current Control ◽  
Deformation Analysis ◽  
Dimensional Model ◽  
3 Dimensional ◽  
Wrist Flexor ◽  
Compression Spring ◽  
Extensor Muscles ◽  
Control Scheme

This paper presents the design and prototyping of an inherently compliant lightweight hand mechanism. The hand mechanism itself has 15 degrees of freedom and five fingers. Although the degrees of freedom in each finger are coupled, reducing the number of independent degrees of freedom to 5, the 15 degrees of freedom of the hand could potentially be individually actuated. Each joint consists of a novel flexing mechanism that is based on the loading of a compression spring in the axial and transverse direction via a cable and conduit system. Currently, a bench top version of the prototype is being developed; the three joints of each finger are coupled together to simplify the control system. The current control scheme under investigation simulates a control scheme where myoelectric signals in the wrist flexor and extensor muscles are converted in to x and y coordinates on a control scheme chart. Static load-deformation analysis of finger segments is studied based on a 3-dimensional model without taking the stiffener into account, and the experiment validates the simulation.

scholarly journals Complete Bredon cohomology and its applications to hierarchically defined groups

2016 ◽  
Vol 161 (1) ◽  
pp. 143-156
Author(s):  
BRITA E. A. NUCINKIS ◽  
NANSEN PETROSYAN
Keyword(s):  
Integral Characteristic ◽  
Linear Groups ◽  
Dimensional Model ◽  
Classifying Space ◽  
Soluble Groups ◽  
3 Dimensional ◽  
Cyclic Groups ◽  
Bredon Cohomology ◽  
Finite Dimensional ◽  
The Family

AbstractBy considering the Bredon analogue of complete cohomology of a group, we show that every group in the class$\cll\clh^{\mathfrak F}{\mathfrak F}$of type Bredon-FP∞admits a finite dimensional model for$E_{\frak F}G$.We also show that abelian-by-infinite cyclic groups admit a 3-dimensional model for the classifying space for the family of virtually nilpotent subgroups. This allows us to prove that for$\mathfrak {F}$, the class of virtually cyclic groups, the class of$\cll\clh^{\mathfrak F}{\mathfrak F}$-groups contains all locally virtually soluble groups and all linear groups over${\mathbb{C}}$of integral characteristic.

Simulation of 7050 Wrought Aluminum Alloy Wheel Die Forging and its Defects Analysis based on DEFORM

2010 ◽  
Author(s):  
Huang Shi-Quan ◽  
Yi You-Ping ◽  
Zhang Yu-Xun ◽  
F. Barlat ◽  
Y. H. Moon ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Die Forging ◽  
Alloy Wheel ◽  
Defects Analysis ◽  
Wrought Aluminum
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