Initial shape optimization for ECDMA based on coupled structural-electrostatic theory

2015 ◽  
Author(s):  
Y.Z. Gu ◽  
W.M. Jiang ◽  
J.L. Du ◽  
D.B. Qin
Keyword(s):  
Shape Optimization ◽  
Initial Shape ◽  
Electrostatic Theory

Optimal Cantilever Design by Topology and Shape Optimization Methods

2015 ◽  
Vol 789-790 ◽  
pp. 306-310
Author(s):  
Jin Woo Lee
Keyword(s):  
Shape Optimization ◽  
Optimization Problem ◽  
Optimization Problems ◽  
Optimization Methods ◽  
Mode Frequency ◽  
Torsional Mode ◽  
Initial Shape ◽  
Topology Optimization Problem ◽  
Torsion Mode ◽  
Topology And Shape Optimization

This work presents the framework to optimally design a cantilever for torsion mode frequency maximization. A cantilever design problem is formulated by topology and shape optimization methods. The torsion mode frequency is selected as an objective function, and the volume of the cantilever and the first bending mode frequency are constrained. Two optimization problems are defined and sequentially solved for the specific values. A new idea in this work is using a final topology obtained in the topology optimization problem as an initial shape in the shape optimization problem. The torsional mode frequency of the optimized cantilever is well improved in comparison with a nominal cantilever.

Blank Shape Optimization of Square Cup Deep-Drawing under the Unilateral Constrained Condition

2011 ◽  
Vol 239-242 ◽  
pp. 2365-2369
Author(s):  
Li Guang Tan ◽  
Xiao Ting Xiao ◽  
Li Cheng Huang ◽  
Qiao Yu Chen
Keyword(s):  
Sensitivity Analysis ◽  
Shape Optimization ◽  
Deep Drawing ◽  
Simulation Method ◽  
Analysis Software ◽  
Initial Shape ◽  
Before And After ◽  
Blank Shape Optimization ◽  
Blank Shape

To satisfy the forming need of single-basin with a flange, sensitivity analysis is used to optimize the shape on the basis of the initial shape which gotten by the backward simulation method of analysis software ETA/Dynaform5.5.The optimum blank shape for unilateral constrained square cup deep-drawing is determined, and the optimized results were analyzed and compared before and after. Some measures about blank optimization will be given to such parts.

Towards Inverse Form Finding Methods for a Deep Drawing Steel DC04

2012 ◽  
Vol 504-506 ◽  
pp. 619-624 ◽  
Author(s):  
Sandrine Germain ◽  
Paul Steinmann
Keyword(s):  
Shape Optimization ◽  
Deep Drawing ◽  
Computation Time ◽  
Reference Configuration ◽  
Initial Shape ◽  
Mechanical Formulation ◽  
Optimization Formulation ◽  
Inverse Deformation ◽  
A Minor ◽  
Strain Space

A challenge in the design of functional parts in metal forming processes is the determination of the initial, undeformed shape such that under a given load a part will obtain the desired deformed shape. An inverse mechanical or a shape optimization formulation might be used to solve this problem, which is inverse to the standard kinematic analysis in which the undeformed shape is known and the deformed shape unknown. The objective of the inverse mechanical formulation aims in the inverse deformation map that determines the (undeformed) material configuration, where the spatial (deformed) configuration and the mechanical loads are given. The shape optimization formulation predicts the initial shape in the sense of an inverse problem via successive iterations of the direct problem. In this paper, both methods are presented using a formulation in the logarithmic strain space. An update of the reference configuration of the sheet of metal during the optimization process is proposed in order to avoid mesh distortions. A first example showed the results obtained with both methods in isotropic hyperelasticity. A second example illustrated a simplified deep drawing computed with the shape optimization formulation in isotropic elastoplasticity. From the undeformed shapes obtained with both methods the deformed shapes are acquired with the direct mechanical formulation. Compared to the target deformed shape a minor difference in node coordinates is found. The computation time is lower with the inverse mechanical formulation in hyperelasticity. The update of the reference configuration in the shape optimization formulation allowed to avoid mesh distortions but increased the computational costs.

Isogeometric Shape Optimization for Compliant Mechanisms With Prescribed Load Paths

2014 ◽  
Author(s):  
Giuseppe Radaelli ◽  
Just L. Herder
Keyword(s):  
Shape Optimization ◽  
Degrees Of Freedom ◽  
Compliant Mechanisms ◽  
Fiber Composite ◽  
Optimization Procedure ◽  
Linear Analysis ◽  
Carbon Fiber Composite ◽  
Shape Accuracy ◽  
Initial Shape ◽  
Load Paths

This paper presents a method for the design of compliant mechanisms with large deflections and prescribed load paths. While the approach is general, this paper treats the shape optimization for two dimensional beams. Due to the geometric non-linearity of the problem the non-linear analysis is nested into the optimization procedure. This requires accurate and efficient analysis of the structural problem. The analysis of the beam is based on the Isogeometric Analysis formulation, an alternative for conventional FEA especially appreciated for its shape-accuracy and efficiency. The method is applied to the synthesis of a balancer for a pendulum, which involves a two step load case: first a prestressing phase and subsequently a motion phase under the influence of gravity. To this end, a prestressed compliant beam was optimized with respect to its initial shape and the preload conditions. The rotationless character of the degrees of freedom of the Isogeometric beam requested the formulation of specific boundary conditions in order to apply rotations on the beam. The results of the shape optimization have been validated with a prototype out of carbon fiber composite material, which has been successfully tested. The experimental results are in agreement with the simulation results, with an error of 3%.

scholarly journals Surrogate based blended-wing-body underwater glider shape optimization design

2021 ◽  
Vol 39 (1) ◽  
pp. 85-92
Author(s):  
Pengcheng Ye ◽  
Congcong Wang ◽  
Guang Pan
Keyword(s):  
Shape Optimization ◽  
Optimization Design ◽  
Optimization Problems ◽  
Hydrodynamic Performance ◽  
Underwater Glider ◽  
Design Quality ◽  
Initial Shape ◽  
Blended Wing Body ◽  
Computational Resources ◽  
Optimization Efficiency

In order to improve the design quality and optimization efficiency for blended-wing-body underwater glider(BWBUG) shape design optimization problems, a surrogate-based blended-wing-body underwater glider shape optimization(SBUGSO) framework is proposed. The aim is to maximize the lift to drag ratio(LDR) of BWBUG with the constrain that the displacement volume of the optimal shape is larger than that of the initial shape. The LDR of the optimal BWBUG is improved by 24.32% with acceptable computational resources. The optimization results show that the present SBUGSO framework can efficiently decrease the computational resource, and improve the hydrodynamic performance and loading capacity of BWBUG. Comparing with the other optimization algorithms, SBUGSO framework shows the significant superiority.

Tensile Failure of 55-Nitinol Wire

1975 ◽  
Vol 33 ◽  
pp. 46-47
Author(s):  
F. I. Grace
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Stoichiometric Composition ◽  
Tensile Failure ◽  
Initial State ◽  
Initial Shape ◽  
Nitinol Wire ◽  
Cscl Type ◽  
Shear Transformation

An interest in NiTi alloys with near stoichiometric composition (55 NiTi) has intensified since they were found to exhibit a unique mechanical shape memory effect at the Naval Ordnance Laboratory some twelve years ago (thus refered to as NITINOL alloys). Since then, the microstructural mechanisms associated with the shape memory effect have been investigated and several interesting engineering applications have appeared.The shape memory effect implies that the alloy deformed from an initial shape will spontaneously return to that initial state upon heating. This behavior is reported to be related to a diffusionless shear transformation which takes place between similar but slightly different CsCl type structures.

Shape Optimization of Combo Sensor using Quartz Crystal Resonator for Liquid Analysis

2016 ◽  
Vol 136 (8) ◽  
pp. 343-347 ◽  
Author(s):  
Ryo Sakai ◽  
Hiroaki Imai ◽  
Masayuki Sohgawa ◽  
Takashi Abe
Keyword(s):  
Shape Optimization ◽  
Quartz Crystal ◽  
Quartz Crystal Resonator ◽  
Crystal Resonator
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