Optimization design, manufacturing and mechanical performance of box girder made by carbon fiber-reinforced epoxy composites

2018 ◽  
Vol 25 (2) ◽  
pp. 297-307 ◽  
Author(s):  
Bin Yang ◽  
Lili Tong ◽  
Cheav Por Chea
Keyword(s):  
Composite Structures ◽  
Optimization Design ◽  
High Efficiency ◽  
Mechanical Performance ◽  
Parametric Design ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Experimental Tests ◽  
Bending Test ◽  
Box Girder

AbstractOptimization design and manufacturing play an important role in obtaining successful composite structures with high efficiency and safe use of materials. In this paper, we first present the optimization design procedure for a composite box girder by ANSYS parametric design language (APDL) in the ANSYS software. The input parameters used in the simulation work were determined via fundamental experimental tests of composite specimens. Then we manufactured the designed composite box girder by mold-pressing prepreg technology according to the optimization results. The finial composite girder structure composed of arch top, web and bottom composite plate was obtained. The optimization procedure indicated that the use of stiffening plates in a girder could decrease the weight and increase the failure load. The location and ply mode of the stiffening plates in girder were suggested. The three-point-bending test was performed on the girder, and the test indicated that load-carrying capacity in unit mass of the optimized girder was as high as 107.8 N/g. Simulation and experimental results match well, and the maximum and minimum stresses in each layer were within the strength limitation of carbon material after optimized in the procedure.

Reliability-based design optimization of 3D orthogonal woven composite automobile shock tower

2021 ◽  
pp. 002199832110476
Author(s):  
Zhao Liu ◽  
Lei Zhang ◽  
Ping Zhu ◽  
Mushi Li
Keyword(s):  
Design Optimization ◽  
Composite Structures ◽  
Optimization Design ◽  
Optimization Procedure ◽  
Woven Composite ◽  
Reliability Based Design Optimization ◽  
Multi Scale ◽  
Reliability Based Design ◽  
Design Variables ◽  
3D Orthogonal Woven

Three-dimensional orthogonal woven composites are noted for their excellent mechanical properties and delamination resistance, so they are expected to have promising prospects in lightweight applications in the automobile industry. The multi-scale characteristics and inherent uncertainty of design variables pose great challenges to the optimization procedure for 3D orthogonal woven composite structures. This paper aims to propose a reliability-based design optimization method for guidance on the lightweight design of 3D orthogonal woven composite automobile shock tower, which includes design variables from material and structure. An analytical model was firstly set up to accurately predict the elastic and strength properties of composites. After that, a novel optimization procedure was established for the multi-scale reliability optimization design of composite shock tower, based on the combination of Monte Carlo reliability analysis method, Kriging surrogate model, and particle swarm optimization algorithm. According to the results, the optimized shock tower meets the requirements of structural performance and reliability, with a weight reduction of 37.83%.

scholarly journals The optimization design of the triangular mesh of the lamella ellipsoid reticulated shell and the comparative analysis of its static performance

2020 ◽  
Vol 165 ◽  
pp. 06054
Author(s):  
Shuai Chong ◽  
Lili Huang ◽  
Junchao Cao ◽  
Xiaoyang Lu
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
Optimization Design ◽  
Mechanical Performance ◽  
Parametric Design ◽  
Isosceles Triangle ◽  
Optimization Method ◽  
Triangle Mesh ◽  
Ansys Software ◽  
Static Performance

Using the traditional geometric principle and ANSYS software Parametric Design Language (APDL), the optimization method is given for the triangular shell mesh of lamella ellipsoid. The mechanical properties of two types of ellipsoidal reticulated shells, optimized isosceles shell (OIS) and traditional shell (TS), are analyzed by comparison with ANSYS software. The results show that the ellipsoidal reticulated shell composed of an optimized isosceles triangle mesh has better mechanical performance and is widely used in engineering.

FEM Research on Static Mechanical Performance of Twice Prestressed Composite Curved Beam

2011 ◽  
Vol 243-249 ◽  
pp. 1038-1042
Author(s):  
Fang Fang Wei ◽  
Jin Bo Wang ◽  
Ben Wei Zou ◽  
Hao Sun
Keyword(s):  
Prestressed Concrete ◽  
Composite Structures ◽  
Mechanical Performance ◽  
Curved Beam ◽  
Box Girder ◽  
Bearing Load ◽  
Static Mechanical ◽  
Deformation Stress ◽  
Girder Bridge ◽  
Ordinary Steel

The conception of twice prestressed composite structures (TPCS) was proposed in order to solve great distortion problems in prestressed concrete structures. Through decomposition of the total prestress, we define the 1st stage as one part of the prestress acting on a prefabricated beam, and the 2nd as the other part on a post-pouring structure. This kind of structure could substantially decrease its distortion and enhance the efficiency of prestress, at the same time contributing to flexibly laying the prefabricated concrete. A continuous curved prestressed concrete box girder bridge was modeled with the FEM software ANSYS, taking into account the ordinary steel and prestressed losses. The aim is to analyze the deformation, stress performance, the impacts of the primary prestressed force value on the anti-deforming performance as well as bearing load performance of the twice prestressed composite curved beam. The conclusion could provide a basis for the application and promotion of the structure.

Arbitrary Blade Section Design Based on Viscous Considerations. Blade Optimization

1996 ◽  
Vol 118 (2) ◽  
pp. 364-369
Author(s):  
B. Bouras ◽  
F. Karagiannis ◽  
P. Chaviaropoulos ◽  
K. D. Papailiou
Keyword(s):  
Optimization Design ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Shear Layers ◽  
Turbulent Shear ◽  
Design And Optimization ◽  
Blade Optimization ◽  
Blade Shape ◽  
Section Design ◽  
Blade Section

A blade design and optimization procedure is presented in this work, which is based on viscous flow considerations. This procedure concerns the design of optimum rotating arbitrary compressible high subsonic compressor and turbine blade shapes. It takes into account the effects of wall curvature and Coriolis force on turbulence, while it allows the variation of stream surface radius, along which the blade shape is placed, as well as streamtube width, with meridional distance. In order to establish the inverse part of the viscous optimization procedure, aspects such as laminar stability, transition, optimum deceleration and, more generally, the behaviour of compressible attached and separated shear layers are discussed. A plane on which all the general properties of the compressible laminar and turbulent shear layers appear, is constructed and the generation of optimum shear layers for the critical side of the blade shape is established. The complete optimization (design) procedure is then described and discussed, while various designs realized by the present procedure are presented at the end of this paper.

scholarly journals Design, Analysis, and Experimental Evaluation of a Double Coil Magnetorheological Fluid Damper

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Guoliang Hu ◽  
Fengshuo Liu ◽  
Zheng Xie ◽  
Ming Xu
Keyword(s):  
Dynamic Range ◽  
Parametric Design ◽  
Mr Damper ◽  
Optimization Procedure ◽  
Experimental Tests ◽  
Element Model ◽  
Reverse Direction ◽  
Semiactive Control ◽  
Damping Force ◽  
Mr Dampers

A magnetorheological (MR) damper is one of the most advanced devices used in a semiactive control system to mitigate unwanted vibration because the damping force can be controlled by changing the viscosity of the internal magnetorheological (MR) fluids. This study proposes a typical double coil MR damper where the damping force and dynamic range were derived from a quasistatic model based on the Bingham model of MR fluid. A finite element model was built to study the performance of this double coil MR damper by investigating seven different piston configurations, including the numbers and shapes of their chamfered ends. The objective function of an optimization problem was proposed and then an optimization procedure was constructed using the ANSYS parametric design language (APDL) to obtain the optimal damping performance of a double coil MR damper. Furthermore, experimental tests were also carried out, and the effects of the same direction and reverse direction of the currents on the damping forces were also analyzed. The relevant results of this analysis can easily be extended to the design of other types of MR dampers.

scholarly journals A methodology for mould conformal cooling channels optimization exploiting 3D printing

2021 ◽  
Author(s):  
Edoardo Battista Arrivabeni ◽  
Daniele Tomasoni ◽  
Luca Giorleo ◽  
Maurizio Claudio Barbato
Keyword(s):  
3D Printing ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Experimental Tests ◽  
Conformal Cooling ◽  
Testing Procedures ◽  
Cooling Channels ◽  
Conformal Cooling Channels ◽  
Push Forward ◽  
3D Printed

With the advent of 3D printing, it is now possible to produce any part or system with an approach than makes design much deeply interlaced with production. In this scenario, CAE has gained power thanks to the possibility of thinking and then manufacture ideas that go well beyond what was possible in the past. This design approach is perfectly suitable to push forward mould conformal cooling performance. In this work, a coupling of CAD, CFD and 3D printing supported by experimental tests was applied to define a design procedure for conformal cooling channels. In particular, cooling channels for a mould were engineered via CAD, then tested via CFD and, after an initial optimization procedure, the chosen design was 3D printed in specimens suitable to be mounted on a heat exchanger (HX) experimental test rig that was especially adapted for the scope. Fluids temperature, volume flow rates and heat transfer performance were measured. A feedback loop was considered to link measurements and channels redesign. Results together with design and testing procedures are reported and commented.

High-Performance Computer-Aided Optimization of Viscous Dampers for Improving the Seismic Performance of a Tall Steel Building

2018 ◽  
Vol 763 ◽  
pp. 502-509
Author(s):  
Shan Shan Wang ◽  
Stephen Mahin
Keyword(s):  
Seismic Performance ◽  
Earthquake Engineering ◽  
High Performance ◽  
Optimization Design ◽  
Nonlinear Dynamic Analysis ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Viscous Dampers ◽  
Safety Level ◽  
Fluid Viscous Dampers

Using fluid viscous dampers (FVDs) has been demonstrated to be an effective method to improve seismic performance of new and existing buildings. In engineering applications, designs of these dampers mainly rely on trial and error, which could be repetitive and labor intensive. To improve this tedious manual process, it is beneficial to explore more formal and automated approaches that rely on recent advances in software applications for nonlinear dynamic analysis, performance-based evaluation, and workflow management and the computational power of high-performance, parallel processing computers. The optimization design procedure follows the framework of Performance Based Earthquake Engineering (PBEE) and uses an automatic tool that incorporates an optimization engine and structural analysis software: Open System for Earthquake Engineering Simulation (OpenSEES). An existing 35-story steel moment frame is selected as a case-study building for verification of this procedure. The goal of the retrofit design of FVDs is to improve the building’s seismic behavior that focuses on avoiding collapse under a basic-safety, level-2 earthquake (BSE-2E). The objective of the optimization procedure is to reduce the building’s total loss under a BSE-2E event and optimal damper patterns will be proposed. The efficiency of the optimization procedure will be demonstrated and compared with a manual refinement procedure.

scholarly journals Optimized Design of a Novel Hydraulic Propeller Turbine for Low Heads

Designs ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 20
Author(s):  
Dario Barsi ◽  
Marina Ubaldi ◽  
Pietro Zunino ◽  
Robert Fink
Keyword(s):  
Design Optimization ◽  
High Efficiency ◽  
Single Point ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Design Parameters ◽  
Geometrical Parameters ◽  
Practical Case ◽  
Optimized Design ◽  
Starting Point

In the present paper, an optimized design procedure capable of providing the geometry of a high efficiency compact hydraulic propeller turbine for low head is proposed and developed. The turbine preliminary design is based on fundamental turbomachinery mean-line equations and on the employment of statistical correlations, which relate the main geometrical parameters to the fundamental design parameters. The first obtained geometry represents the starting point of an automated aerodynamic single point optimization procedure based on a genetic algorithm generating and updating a wide database of turbine geometries. The approach employs a three-dimensional (3D) Reynolds averaged Navier–Stokes (RANS) solver for the construction of the corresponding database of performance. A meta-model, such as an artificial neural network (ANN), is used to speed up the design optimization process. The procedure has been applied on the practical case of a novel simplified hydraulic propeller turbine prototype for very low heads. The adopted design optimization procedure is able to modify the turbine blade and vane geometries in order to achieve automatically the targeted net head and the maximum for the total to total internal efficiency once diameter, mass flow rate, and rotational speed are assigned.

Finite Element Analysis on Orthotropic Deck with Composite Pavement Layer

2013 ◽  
Vol 275-277 ◽  
pp. 1163-1166
Author(s):  
De Rong Zhu ◽  
Zi Jiang Yang ◽  
Hui Zhang ◽  
Shi Zhong Liu ◽  
Gui Xia Ning
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optimization Design ◽  
Steel Fiber ◽  
Mechanical Performance ◽  
Element Analysis ◽  
Box Girder ◽  
Concrete Layer ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

Orthotropic steel deck; Shear nail; Steel fiber concrete pavement layer; Stress analysis. Abstract. Aiming at the optimization design of composite pavement on orthotropic deck in a streamlined steel box girder with lager wide-to-span ratio, finite element analysis is taken under various loads supplemented with static model; the stress distribution is analyzed in each part of the pavement layer. The theoretical results show that the deck of the bridge displays obviously orthotropic features; shear nails with reasonable density can increase the binding capability of each part of deck pavement and overall mechanical performance. It can be concluded that the service life of the deck pavement can be extended by the use of steel fiber concrete layer.

Experimental Investigation on Mix Designed HSC HSFRC Specimens Perfomed with Volcanic Aggregate

2013 ◽  
Vol 753-755 ◽  
pp. 591-603 ◽  
Author(s):  
Laura Anania ◽  
Antonio Badalà ◽  
Giuseppe D'Agata
Keyword(s):  
Mechanical Performance ◽  
Fiber Type ◽  
Design Procedure ◽  
Experimental Tests ◽  
Tensile Tests ◽  
Mix Design ◽  
Concrete Mixtures ◽  
Mix Proportion ◽  
Proportion Method ◽  
Selection Of

The selection of mix proportion is the process of choosing suitable ingredients of concrete and determine their quantities with the object of producing as economically as possible concrete of notably strength. The current paper deals with the mix design of both an HSC and HSFRC constituted by volcanic aggregates from the quarries of Eastern Sicily in Italy. The mix design was carried out on eight different concrete mixtures by using the theoretical model developed by Feret – De Larrard’s and it is capable of simulating the experimental compressive strength. The HSFRC mixtures consider different volume fractions of fibers equal to 0% (HRC), 0.5% and 2% (HSFRC). Straight Polyvinylalcohol (PVA) and hooked-end steel fibers (ACC) were the two types of fibers employed in the study. Compression and tensile tests were carried out on specimens performed according to UNI codes in order to validate the mixture proportion method adopted. The HSFRC (0.5%) mixtures did not show great differences in mechanical performance by any variation of the fiber type (steel or PVA). The mechanical properties obtained by experimental tests give back a very good accordance with the theoretical prediction of the mix design procedure adopted, and with the data reported in the literature in terms of toughness.

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