The Void Growth Simulations in the Hyper-Elastic Material with Multiple Seeds

2005 ◽  
pp. 45-50
Author(s):  
Tomoaki Tsuji
Keyword(s):  
Elastic Material ◽  
Void Growth ◽  
Hyper Elastic

The Void Growth Simulations in the Hyper-Elastic Material with Multiple Seeds

2005 ◽  
Vol 502 ◽  
pp. 45-50
Author(s):  
Tomoaki Tsuji
Keyword(s):  
Cellular Automaton ◽  
Elastic Material ◽  
Void Growth ◽  
Tensile Load ◽  
Critical Value ◽  
Void Coalescence ◽  
Rectangular Cell ◽  
Non Linear ◽  
Hyper Elastic

The behaviors of a material are nonlinear in the large deformed region. The hyper elastic models can describe such non linear materials. If the hyper elastic material is applied to the hydrostatic tensile load, the void begins to grow when the load exceed the critical value. It is important to study the coalescence of the void growth in order to consider the destruction of the material. In this paper, the void growth simulations in the hyper-elastic material with multiple seeds are studied. The unit rectangular cell with small voids is subjected to the hydrostatic tensile load. This problem can be analyzed by FEM. However, the simulation with the larger number of the voids is not possible. Thus, the CA (Cellular Automaton) is used to describe the behaviors of the void coalescence and the possibility of CA is discussed.

Multiple Void Growth Simulations in the Hyper-Elastic Material

2004 ◽  
Author(s):  
Tomoaki Tsuji
Keyword(s):  
Mechanical Properties ◽  
Elastic Material ◽  
Energy Function ◽  
Void Growth ◽  
Tensile Deformation ◽  
Tensile Load ◽  
Critical Value ◽  
The Other ◽  
Hyper Elastic ◽  
Square Cell

If the hydrostatic tensile load is applied to a hyper-elastic material, the void initiates when the load exceeds the critical value. On the other hand, it is important to study multiple void growth phenomena, in order to consider the fracture by coalescence of voids. In this paper, we study the growth of multiple voids in the hyper-elastic material. The material is characterized by the energy function as the compressive material. Some experiments for the rubber, as a hyper-elastic material, are proceeded, in order to obtain these mechanical properties in the energy function. A square cell with some small voids is constructed and applied with tensile deformation by moving outer surface. The large deformation and the non-linear simulations are proceeded by using FEM. If there is only one seed, one void grows from the seed. However, when there are some seeds, we observed the void growing and the void vanishing by the influence from the other voids. The influence of the initial voids scale to the void growth is studied.

Towards Statically Balanced Compliant Joints Using Multimaterial 3D Printing

2014 ◽  
Author(s):  
Arnaud Bruyas ◽  
François Geiskopf ◽  
Pierre Renaud
Keyword(s):  
3D Printing ◽  
Range Of Motion ◽  
Elastic Material ◽  
Geometry Optimization ◽  
Compliant Joints ◽  
Stiffness Properties ◽  
Large Joint ◽  
Hyper Elastic ◽  
Bistable Mechanism ◽  
Novel Design

Compliant joints are widely used in mechanisms when accurate movements are required. With no assembly requested, they are also a great tool for mesoscale robotics, a field in which compactness and large joint amplitudes are necessary features. In this paper, an original multi-material compliant revolute joint is presented. Taking advantage of multi-material 3D printing, it exhibits a novel design with the integration of an hyper-elastic material. Thanks to a helical shape design, a large range of motion is obtained, and the incompressibility of the hyper-elastic material is used to improve the stiffness properties of the joint while keeping it compact. The spring effect of compliant joints makes mechanism actuation more difficult. The proposed joint is therefore designed with an integrated static balancing system in order to minimize actuation torques. The balancing system is composed of a bistable mechanism, which geometry optimization is presented. Experimental assessment demonstrate that the joint possesses a range of motion of 120°, and the balancing system reduces actuation moments by almost 60%.

scholarly journals Comparison of Ortho-planar Spring design optimization based on Linear Elastic and Hyper Elastic Materials

2018 ◽  
Vol 166 ◽  
pp. 01004
Author(s):  
Ruetai Graipaspong ◽  
Teeranoot Chanthasopeephan
Keyword(s):  
Topology Optimization ◽  
Elastic Material ◽  
Maximum Stress ◽  
Nonlinear Material ◽  
Small Displacement ◽  
Linear Elastic Material ◽  
Output Displacement ◽  
Linear Elastic ◽  
Hyper Elastic ◽  
Matlab Programming

In this paper, compliant Ortho-planar spring was designed based on a three-dimensional topology optimization method. The computation was developed using MATLAB programming. The objective of this work was to apply dual method to design an Ortho-planar spring while the design should have minimum mass and at the same time satisfy a set of constrained displacement. Throughout this paper, we analyzed a method for designing an Ortho-planar spring using linear elastic material and hyperelastic material. The results showed that under small displacement conditions, the output displacement, maximum stress magnitude, and the maximum stress of linear elastic assumption and hyper-elastic material were relatively close to each other. However, the mass fraction and the layout as the result of the optimization process was different. As for larger displacement, the maximum stress of linear elastic material appeared 2.59 times higher than the maximum stress of the hyper-elastic material model. The topology optimization output based on linear material was invalid because the topology of the computed Ortho-planar spring was not appeared as a one-piece layout while the design based on nonlinear material looked promising.

Development of Pressure-Driven Flow Rate Control Valve with Hyper-Elastic Material

2020 ◽  
Vol 29 (3) ◽  
pp. 251-258
Author(s):  
Kibum Lee ◽  
Jaeyong Cho ◽  
Inseon Lee ◽  
Jeongseop Ahn ◽  
Choonsoo Jang ◽  
...  
Keyword(s):  
Flow Rate ◽  
Elastic Material ◽  
Rate Control ◽  
Control Valve ◽  
Hyper Elastic ◽  
Flow Rate Control ◽  
Pressure Driven Flow ◽  
Pressure Driven

A Study on Dynamic Characteristics of Hyper-Elastic Shock Programmer with Truncated Conical Shape

2013 ◽  
Vol 871 ◽  
pp. 240-246
Author(s):  
Tae Ho Yang ◽  
Young Shin Lee ◽  
Yoon Jae Kim ◽  
Tae Hyeong Kim ◽  
Chang Won Shul ◽  
...  
Keyword(s):  
Elastic Material ◽  
Impact Test ◽  
Time History ◽  
Material Model ◽  
Wave Shape ◽  
Time Duration ◽  
Conical Shape ◽  
Design Variables ◽  
Hyper Elastic ◽  
The Impact

Polyurethane (PU) S80A was used as the material of the elastomer of the shock programmer in this paper. To validate Ogden hyper-elastic material model in simulation, the small impact test was performed. As the comparison for the time history of the acceleration between the impact test and simulation was performed. Using the cylindrical shock programmer, the constant used in Ogden hyper-elastic material model was calculated. The wave shape of the acceleration was obtained with the noised sign. To clearly obtain the wave shape of the acceleration the cylindrical shock programmer, the truncated conical shock programmer was used. Using the Ogden hyper-elastic material model, design variables of the shock programmer with the truncated conical shape was studied. Using the shock programmer with truncated conical shape the range on the level and time duration of the acceleration in simulation was from 494.9 m/s2 to 10941 m/s2 and from 1.3 msec to 23.5 msec, respectively.

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