Reduced Stiffness Criteria for the Safe Buckling Design of Thin Shells and its Numerical Validation

2014 ◽  
Vol 905 ◽  
pp. 283-286
Author(s):  
Hong Tao Wang
Keyword(s):  
Lower Bounds ◽  
Design Method ◽  
Thin Shells ◽  
Test Results ◽  
Element Analysis ◽  
Design Factor ◽  
Critical Design ◽  
Large Sets ◽  
Experimental Design Method ◽  
Marine Engineering

Thin metallic shells have long been adopted as major structural components in weight-sensitive applications, especially in marine engineering. Imperfection sensitive buckling is a critical design factor when these structures are loaded in compression. Traditional experimental design method depends on deriving lower bounds to the scatter of large sets of test results. This paper aims to present an analytical approach, the so-called reduced stiffness method (RSM) to the lower-bound buckling of thin-metallic shells. The validity of the RSM for the prediction of the safe lower bounds to the buckling of thin shells is verified through carefully controlled finite element analysis and the comparative studies confirm the reliability of the RSM.

scholarly journals Theoretical and Experimental Research on Switching Optimization of No. 9 Single Turnout with 60-kg/m Rails

Machines ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 294
Author(s):  
Pu Wang ◽  
Shuguo Wang ◽  
Zhenhua Zhao ◽  
Daolin Si
Keyword(s):  
Design Method ◽  
Safety Margin ◽  
Calculation Model ◽  
Test Results ◽  
Optimization Scheme ◽  
Element Analysis ◽  
Switching Model ◽  
Switching Design ◽  
Refined Calculation ◽  
Traction Power

Based on the necessity of optimizing the structure of No. 9 single turnouts of 60-kg/m rails, we addressed the issues associated with existing turnout switching design methods. Based on finite element analysis, we established a refined calculation model for turnout switching. The model can determine the plane alignment of a switch rail separated from the stock rail based on the actual force acting upon the switch rail. The obtained plane alignment is consistent with the actual situation and is thus reliable. Based on the established turnout switching model, the minimum flangeway width and dynamics between the strokes of the first and second traction points under different conditions were analyzed by numerical simulations. Accordingly, we propose an optimized scheme that takes 160 mm and 85 mm as the stroke value for the first and second traction points, respectively. The scheme helps to meet the requirements for minimum flangeway width while making the deformation of the switch rail more even and therefore minimizing the traction power. Based on the proposed design, trial production and laying of the new No. 9 single turnout with a 60-kg/m rail was conducted, and a switching test was performed. The switching forces at the first and second traction points of the new No. 9 turnout were approximately 1200 and 2000 N, respectively, which were higher than those of existing No. 9 turnouts with 60-kg/m steel rails. Besides, the minimum flangeway width satisfies the requirement for safe vehicle passage with a safety margin of 3–5 mm. The test results proved the effectiveness of the proposed turnout switching design method and parameter optimization scheme.

Groove Optimization and Finite Element Analysis for Different Groove Milling Insert

2012 ◽  
Vol 151 ◽  
pp. 716-720
Author(s):  
Yao Nan Cheng ◽  
Li Quan Wang ◽  
Zhen Jia Li ◽  
Jun Gao ◽  
Xiao Chun Ao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Method ◽  
Field Analysis ◽  
Orthogonal Experimental Design ◽  
Testing System ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Experimental Design Method ◽  
Stress Field Analysis

Based on the experiments on milling the 45 steel with several types of different grooves milling inserts, this article has groove optimization and finite element analysis for different groove milling inserts. With the milling force testing system and orthogonal experimental design method, we have experiments with five types of different groove milling inserts for machining the 45 steel and compare their cutting capability, and the different grooves milling inserts are optimized. Based on the experiments, we have stress field analysis for different grooves milling inserts with finite element analysis method. The finite element analysis results are consistent with the experiment results well. All these studies provide the theoretic and experimental bases for groove development and groove optimization technology.

The Design of Fabric Expansion Joint Gas Seal Membranes

2008 ◽  
Author(s):  
David Peterson ◽  
Robert Broyles
Keyword(s):  
Analytical Methods ◽  
Mechanical Design ◽  
Woven Fabric ◽  
Test Results ◽  
Element Analysis ◽  
Design Factor ◽  
Expansion Joints ◽  
Chemical Attack ◽  
Sustained Operation ◽  
Leakage Failure

Fabric expansion joints are commonly used in round and rectangular ducting systems for accommodating differential thermal expansion and containing internal pressure. Fabric expansion joints are intended for sustained operation without significant leakage. Failure of fabric expansion joints can lead to plant shutdowns. The outer gas seal membrane is a structural material most commonly made from woven fabric with an elastomeric coating. The fibers in the fabric are comparatively strong and flexible but not chemically resistant. The coating protects the fibers from chemical attack and seals the woven fabric to minimize leakage through the material. The fabric material is typically clamped between metal frames attached to the ducting. The orientation of the fibers with respect to the frames is a critical design factor. Fabric expansion joints are normally designed in accordance with the guidelines of the Fluid Sealing Association Technical Handbook. The handbook gives helpful information but does not provide analytical methods for the mechanical design of gas seal membranes. The intent of this paper is to provide analytical methods for determining the movement capability and pressure capacity of gas seal membranes. Test results and non-linear finite element analysis are used to support the proposed methods.

Meningkatkan Keterampilan Siswa Dalam Materi Chest Pass Bola Basket Melalui Wa-G Dan Zoom Video

2021 ◽  
Vol 1 (2) ◽  
pp. 51-56
Author(s):  
Ilham Setiawan
Keyword(s):  
Design Method ◽  
Sampling Technique ◽  
Mean Value ◽  
Test Results ◽  
Average Value ◽  
Experimental Design Method ◽  
Before And After ◽  
Post Test ◽  
Quasi Experimental ◽  
Class Viii

This research is motivated by a factual basis about Improving Student Skills in Basketball Chest Pass Materials Through WA-G and Zoom Video. To find out whether there is an increase in basketball chest pass skills through (WA-G), whether there is an increase in basketball chest pass skills through video zoom, and which is more effective between using (WA-G) and using video zoom to improve chest pass skills. basketball The researcher used a quantitative approach with a quasi-experimental design method. The population of this study were all students of class VIII SMP Negeri 5 Tanjung with a total of 90 students. The sampling technique in this study used a purposive sampling technique with 30 class VIII students at SMP Negeri 5 Tanjung. To find out whether the test results are valid or not, it must be done through Pre-test and Post-test tests and data analysis techniques in this study using normality, homogeneity, and hypothesis testing techniques. The results showed that there was an increase between before and after being given treatment through WA-G towards an increase in the level of basic chest pass technique skills of class VIII students of SMP N 5 Tanjung with a mean value or average pretest of 78.58 to posttest of 82.48 and a score of 82.48. sum or the number of pretest is 2436 to posttest is 2557, there is an increase between before and after being given treatment via zoom video to increase the level of basic chest pass technique skills of students of class VIII SMP N 5 Tanjung with a mean or average value, pretest of 78.23 to posttest of 81.35 and the sum value or the number of pretests of 2425 to posttest of 2522, and the increase in the WA-G group was greater than the video zoom group.

Synergistic Analysis of Seawater Parameters’ Effect on Corrosion Rate of Austenitic Stainless Steels 304 and 316

2010 ◽  
Author(s):  
Mahmood Pakshir ◽  
Sanam Atashin ◽  
Arash Yazdani
Keyword(s):  
Corrosion Rate ◽  
Stainless Steels ◽  
Design Method ◽  
Austenitic Stainless Steels ◽  
Average Value ◽  
Experimental Design Method ◽  
Engineering Designs ◽  
Marine Engineering ◽  
The Individual

In this research the synergistic effect of environmental factors on corrosion rate of austenitic stainless steels 304 and 316 has been assessed. The behavior and resistance of these alloys are studied in aerated synthetic seawater, using potentiodynamic polarization scan. The salinity, velocity, pH and temperature are the considered parameters. To study the individual and interactive contribution percentage of parameters on changing the average value of corrosion rate, a quantitative full two-level factorial experimental design method is applied. Beside this quantitative analysis, qualitative analysis has been used to predict the variation direction. By means of these two analyses we can predict the magnitude and quality of each parameter’s effect. This research has a potential in prediction of alloys’ behavior, which is really valuable in marine engineering designs.

Punching Shear Design Method of Voided Slabs

2017 ◽  
Vol 754 ◽  
pp. 333-336
Author(s):  
Joo Hong Chung ◽  
Hyun Ki Choi ◽  
Chang Sik Choi ◽  
Hyung Suk Jung
Keyword(s):  
Finite Element Analysis ◽  
Shear Strength ◽  
Design Method ◽  
Fe Analysis ◽  
Punching Shear ◽  
Test Results ◽  
Sectional Area ◽  
Element Analysis ◽  
Cross Sectional ◽  
Shear Design

This study presents punching shear design method of voided slab in accordance with arrangement of voids around columns. According to previous studies, the slab-column connection of voided slabs is weaker than that of the solid slab due to the lack of cross-sectional area of concrete by voids. In this study, it is assumed that the arrangement of voids exert influence on the punching shear strength of voided slabs. To verify the assumption, finite element analysis was conducted related with previous test results. The variable of FE analysis was a distance between voids and column face. Based on FE analysis and test results including previous studies, punching shear design method is suggested which can consider the arrangement of voids around columns. The suggested design method is based on the punching shear design method in ACI-318. As a result, it can predict the punching shear strength of voided slabs according to arrangement of voids around column.

Orthogonal Experiment and Analysis of the Concrete which Use the Shell as Aggregate

2012 ◽  
Vol 204-208 ◽  
pp. 3942-3945
Author(s):  
Chao Gao ◽  
Zhu Pan ◽  
Xiang Zhen Wei
Keyword(s):  
Experimental Design ◽  
Design Method ◽  
Orthogonal Experiment ◽  
Concrete Strength ◽  
Orthogonal Experimental Design ◽  
Test Results ◽  
Systematic Analysis ◽  
Multiple Factors ◽  
Experimental Design Method ◽  
Aggregate Effects

In order to test the impactions on the strength of the concrete which Use the Shell as aggregate effects of the shell for the aggregate by the use of limited and comprehensive and effective consideration of multiple factors, Use of orthogonal experimental design method to test concrete strength of shells for the aggregate. And then through the systematic analysis of the test results, obtained the proportion of mixture for the best strength.

Finite Element Analysis of Reinforced Concrete Beams with Exterior FRP Shell

2011 ◽  
Vol 243-249 ◽  
pp. 1461-1465
Author(s):  
Chuan Min Zhang ◽  
Chao He Chen ◽  
Ye Fan Chen
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Contact Interface ◽  
Accurate Calculation ◽  
Element Analysis

The paper makes an analysis of the reinforced concrete beams with exterior FRP Shell in Finite Element, and compares it with the test results. The results show that, by means of this model, mechanical properties of reinforced concrete beams with exterior FRP shell can be predicted better. However, the larger the load, the larger deviation between calculated values and test values. Hence, if more accurate calculation is required, issues of contact interface between the reinforced concrete beams and the FRP shell should be taken into consideration.

scholarly journals Electromagnetic-Thermal Integration Design of Permanent Magnet Motor for Vehicles

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Shijun Chen ◽  
Qi Zhang ◽  
Surong Huang
Keyword(s):  
Permanent Magnet ◽  
High Performance ◽  
Design Method ◽  
Electromagnetic Properties ◽  
Permanent Magnet Motor ◽  
Element Analysis ◽  
Experiment Platform ◽  
Motor Design ◽  
Dimensional Parameters ◽  
Thermal Integration

To more efficiently design high performance vehicular permanent magnet motor, an electromagnetic-thermal integration design method is presented, which considers both the electromagnetic properties and the temperature rise of motor winding when determining the main dimensional parameters of the motor. Then a 48-slot and 8-pole vehicular permanent magnet motor is designed with this method. The thermomagnetic coupling design is simulated and validated on the basis of multiphysical domain on finite element analysis. Then the prototype is analyzed and tested on a newly built motor experiment platform. It is shown that the simulation results and experimental results are consistent, which validate the accuracy and effectiveness of the new design method. Also this method is proved to well improve the efficiency of permanent magnet motor design.

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