Case Study 2.2: Clamping of Thin-Walled Curved Workpieces

2017 ◽  
pp. 81-98 ◽  
Author(s):  
Petr Kolar ◽  
Jiri Sveda ◽  
Jan Koubek
Keyword(s):  
Thin Walled

Thin-walled open-section P/C beams in fire: a case study

2010 ◽  
pp. 173-194 ◽  
Author(s):  
Patrick Bamonte ◽  
Roberto Felicetti ◽  
Pietro G. Gambarova ◽  
Ezio Giuriani
Keyword(s):  
Open Section ◽  
Thin Walled ◽  
In Fire

scholarly journals Silo with a Corrugated Sheet Wall

2013 ◽  
Vol 21 (3) ◽  
pp. 19-30 ◽  
Author(s):  
Csaba Németh ◽  
Ján Brodniansky
Keyword(s):  
Computational Models ◽  
Bending Moment ◽  
Physical Models ◽  
Experimental Measurements ◽  
Bending Moments ◽  
Bulk Materials ◽  
Production And Consumption ◽  
Thin Walled ◽  
The Mathematical Model

Abstract Silos and tanks are currently being used to create reserves of stored materials. Their importance is based on balancing the production and consumption of bulk materials to establish an adequate reserve throughout the year. The case study introduced within the framework of this paper focuses on thin-walled silos made of corrugated sheets and on an approach for designing these types of structures. The storage of bulk materials causes compression or tensile stresses in the walls of a silo structure. The effect of a frictional force in the silo walls creates an additional bending moment in a wave, which ultimately affects the resulting bending moments. Several mathematical and physical models were used in order to examine various types of loading and their effects on a structure. Subsequently, the accuracy of the computational models was verified by experimental measurements on a grain silo in Bojničky, Slovakia. A comparison of the experimental and mathematical models shows a reasonable match and confirms the load specifications, while indicating that the mathematical model was correct.

Metal Injection Molding of Thin-Walled Titanium Glasses Arms: A Case Study

JOM ◽  
2018 ◽  
Vol 70 (5) ◽  
pp. 616-620 ◽  
Author(s):  
Shulong Ye ◽  
Wei Mo ◽  
Yonghu Lv ◽  
Xia Li ◽  
Chi Tat Kwok ◽  
...  
Keyword(s):  
Injection Molding ◽  
Metal Injection Molding ◽  
Thin Walled

scholarly journals Fixture Optimization in Turning Thin-Wall Components

Machines ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 68
Author(s):  
Lisa Croppi ◽  
Niccolò Grossi ◽  
Antonio Scippa ◽  
Gianni Campatelli
Keyword(s):  
Finite Element ◽  
Cutting Forces ◽  
Thin Wall ◽  
Effective Solution ◽  
Static Deflection ◽  
Thin Walled ◽  
Unstable Vibration ◽  
Dimensional Errors ◽  
Wall Components

The turning of thin-walled components is a challenging process due to the flexibility of the parts. On one hand, static deflection due to the cutting forces causes geometrical and dimensional errors, while unstable vibration (i.e., chatter) could compromise surface quality. In this work, a method for fixturing optimization for thin-walled components in turning is proposed. Starting from workpiece geometry and toolpath, workpiece deflections and system dynamics are predicted by means of an efficient finite element modeling approach. By analyzing the different clamping configurations, a method to find the most effective solution to guarantee the required tolerances and stable cutting conditions is developed. The proposed method was tested as a case study, showing its application and achievable results.

scholarly journals Data-Driven Decision-Making in the Design Optimization of Thin-Walled Steel Perforated Sections: A Case Study

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
Zhi-Jun Lyu ◽  
Qi Lu ◽  
YiMing Song ◽  
Qian Xiang ◽  
Guanghui Yang
Keyword(s):  
Decision Making ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Optimization Design ◽  
Data Driven ◽  
Physical Test ◽  
Element Simulation ◽  
Industrial Big Data ◽  
Thin Walled

The rack columns have so distinctive characteristics in their design, which have regular perforations to facilitate installation of the rack system that it is more difficult to be analyzed with traditional cold-formed steel structures design theory or standards. The emergence of industrial “big-data” has created better innovative thinking for those working in various fields including science, engineering, and business. The main contribution of this paper lies in that, with engineering data from finite element simulation and physical test, a novel data-driven model (DDM) using artificial neural network technology is proposed for optimization design of thin-walled steel specific perforated members. The data-driven model based on machine learning is able to provide a more effective help for decision-making of innovative design in steel members. The results of the case study indicate that compared with the traditional finite element simulation and physical test, the DDM for the solving the hard problem of complicated steel perforated column design seems to be very promising.

Cutting Parameters Optimization of Thin-Walled Workpiece Based on PSO and FEM

2012 ◽  
Vol 248 ◽  
pp. 408-412
Author(s):  
Li Li Qian ◽  
Wei Fang Chen ◽  
Wan Tai Ma
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cutting Parameters ◽  
Parameters Optimization ◽  
Particle Swarm Algorithm ◽  
Maximum Deformation ◽  
Design Variables ◽  
Thin Walled ◽  
Cutting Parameters Optimization

An approach to optimize the cutting parameters based on Particle Swarm Algorithm(PSO) and Finite Element Method(FEA) was proposed. A cutting parameters optimization model was established whose design variables are the cutting parameters and objective function is to minimize the maximum deformation. PSO was used to optimize the cutting parameters and FEA was utilized to predict the machining deformation of the thin-walled workpiece. Finally, the entire technique was demonstrated in a case study. The simulation and experimental results show that the approach can be further employed into the practical machining situation.

A Case Study to Solve the Problem of Wall Thickness Attenuation during Extrusion to Produce a Complex Hollow Magnesium Profile

2009 ◽  
Vol 424 ◽  
pp. 227-234
Author(s):  
Luo Xing Li ◽  
Jia Zhou ◽  
X. He ◽  
Jie Zhou ◽  
Jurek Duczczyk
Keyword(s):  
Hydrostatic Pressure ◽  
Wall Thickness ◽  
Software Package ◽  
Practical Problem ◽  
Fem Simulation ◽  
Experimental Measurements ◽  
Thin Walled ◽  
Present Case Study

The present case study addressed a practical problem of wall thickness attenuation during extrusion to produce a complex thin-walled hollow magnesium profile. A HyperWorks FEM software package was employed to aid in identifying the causes for the wall thickness attenuation. Recommendations were made to adjust the interspacing between the mandrels and the height of the welding chamber. The modified dies yielded much improved results in terms of velocity and hydrostatic pressure uniformity. The wall thickness of the extrudate predicted using FEM simulation was very close to experimental measurements. The case study demonstrated the feasibility of using FEM simulation as a useful tool to solve industrial problems encountered in the production of complex profiles.

scholarly journals Method for Determining Longitudinal Stiffness of Combined Double Thin-Walled Pier Based on Train-Track-Bridge Interaction

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Hui Fang ◽  
Zhaowei Chen
Keyword(s):  
Train Track ◽  
Urban Transit ◽  
Transit System ◽  
Limit Values ◽  
Longitudinal Stiffness ◽  
Practical Engineering ◽  
Thin Walled ◽  
Track Bridge ◽  
The Relationship

Combined double thin-walled pier is a new kind of pier adopted in the urban transit system in China, whose longitudinal stiffness cannot be determined by adopting traditional methods. Aiming at this practical issue, this work proposed an alternative method for determining the longitudinal stiffness of the combined double thin-walled pier based on the train-track-bridge interaction. Primarily, the relationship between longitudinal stiffness of the pier and rail stress is underlined, based on which the proposed methodology is described in detail. Finally, a case study is conducted to validate the effectiveness of the proposed method. Results show that the train-track-bridge dynamic interaction theory is effective in determining the longitudinal stiffness of the newly designed and special pier. Rail stress and longitudinal displacement of pier top exceed their limit values with the change of pier longitudinal stiffness. The dynamic stress and thermal stress of rail are the two most important indicators in determining pier longitudinal stiffness, which should be paid attention to in practical engineering.

Locator Layout Optimization for Checking Fixture Design of Thin-Walled Parts

2013 ◽  
Vol 572 ◽  
pp. 593-596 ◽  
Author(s):  
Xiong Hui Zhou ◽  
Wei Liu ◽  
Qiang Niu ◽  
Peng Wang ◽  
Kun Jiang
Keyword(s):  
Finite Element Method ◽  
Particle Swarm Optimization ◽  
Optimization Method ◽  
Work Piece ◽  
Fixture Design ◽  
The Finite Element Method ◽  
Swarm Optimization ◽  
Thin Walled ◽  
Locator Layout

The location of a checked part is one of the most critical and complicated problems in the checking fixture design (CFD) for thin-walled parts with less stiffness. The unreasonable layout of locators will give rise to the high deflection of the checked part and affect measure accuracy. Based on the “N-2-1” locating principle, an optimization method is presented to determine the locator layout, where the finite element method (FEM) is used to calculate the maximal deformation of the work piece which is used to be an objective function of optimization, and the Particle Swarm Optimization (PSO) with fine performance of global convergence is adopted as an optimization solver to seek for the optima. Finally, a case study is presented to verify the proposed method.

Sign in / Sign up

Export Citation Format

Share Document