Study on a straightening process by reciprocating bending for metal profiles

2021 ◽  
Vol 118 (6) ◽  
pp. 605
Author(s):  
Qingdang Meng ◽  
Gaocao Yu ◽  
Xueying Huang ◽  
Honglei Sun ◽  
Jun Zhao
Keyword(s):  
Numerical Simulation ◽  
Elastic Deformation ◽  
Quality Parameter ◽  
Area Ratio ◽  
Physical Experiment ◽  
Rectangular Section ◽  
Residual Deflection ◽  
Section Profile ◽  
Different Shapes

The straightness is a critical quality parameter of metal profiles, and straightening is a necessary process in metal profile production. Due to the limitations of the existing straightening methods, the straightening process by reciprocating bending for metal profiles is proposed. The curvature is unified by multiple reciprocating bending, and then the straightening is completed by reverse bending. The process has the advantages of high straightening efficiency, flexibility, and wide straightening range. In order to verify the feasibility of the process, numerical simulation and physical experiment are carried out with the rectangular section profile with “C” shape and “S” shape. The results show the profiles of different shapes are unified into arcs of the same size after multiple reciprocating bending. In addition, the smaller the elastic area ratio (ratio of elastic deformation to overall deformation) is, the better the effect of unification curvature is. The residual deflection is basically the same after straightening, and straightness is within 0.1%.

The study of the elastic deformation of a flexible wheel by a cam wave generator

2020 ◽  
Vol 65 (1) ◽  
pp. 51-58
Author(s):  
Sava Ianici
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Elastic Deformation ◽  
Theoretical Study ◽  
Elastic Field ◽  
The Finite Element Method ◽  
Elastic Deformations ◽  
Wave Generator ◽  
Two Stages

The paper presents the results of research on the study of the elastic deformation of a flexible wheel from a double harmonic transmission, under the action of a cam wave generator. Knowing exactly how the flexible wheel is deformed is important in correctly establishing the geometric parameters of the wheels teeth, allowing a better understanding and appreciation of the specific conditions of harmonic gearings in the two stages of the transmission. The veracity of the results of this theoretical study on the calculation of elastic deformations and displacements of points located on the average fiber of the flexible wheel was subsequently verified and confirmed by numerical simulation of the flexible wheel, in the elastic field, using the finite element method from SolidWorks Simulation.

Numerical Simulation of Influence of Mudstone Interlayer on Compressive Strength of Salt Rock

2012 ◽  
Vol 512-515 ◽  
pp. 1953-1956
Author(s):  
Feng Shan Han ◽  
Song Li
Keyword(s):  
Numerical Simulation ◽  
Compressive Strength ◽  
Natural Gas ◽  
Radioactive Waste ◽  
Mechanical Behavior ◽  
Uniaxial Compressive Strength ◽  
Failure Process ◽  
Physical Experiment ◽  
Salt Rock ◽  
Oil And Natural Gas

Salt rock is think of ideal storage location for oil and natural gas and radioactive waste deposited, interlayer has negative effect on stability of cavern of storage for oil and natural gas and radioactive waste deposited in salt rock, It is difficult to make complete specimen layered salt rock with interlayer. In this paper Based on Rock Failure Process Analysis Code RAFP2D, influence of mudstone interlayer on uniaxial compressive strength of salt rock is investigated by numerical simulation. Numerical simulation shown that when mechanical parameters such as elastic modulus poison’s ratio and uniaxial compressive strength for salt rock and pure mudstone interlayer and content of mudstone interlayer in salt rock are known, compressive strength and mechanical behavior for salt rock with mudstone interlayer can be effectively and accurately analyzed using RFAP2D. The results for numerical simulation are agreement with true physical experiment of salt rock with mudstone interlayer. It should be noticed that the true physical experimental uniaxial compressive strength of rock is in range of 30% mean uniaxial compressive strength of rock element in RFPA2D，in this case the results for numerical simulation can reflect phenomenon and behavior for true physical experiment of salt rock with mudstone interlayer. That provides new method and avenue to analyze and investigate mechanical behavior for multilayer rock mass based on RAFP2D

scholarly journals Evaluation of the Effect of a Step Change in Piezo Actuator Structure on Vibration Reduction Level in Plates

2015 ◽  
Vol 40 (1) ◽  
pp. 71-79 ◽  
Author(s):  
Jerzy Wiciak ◽  
Roman Trojanowski
Keyword(s):  
Numerical Models ◽  
Vibration Reduction ◽  
Outer Part ◽  
Physical Experiment ◽  
Step Change ◽  
Material Composition ◽  
Numerical Analyses ◽  
Piezo Actuator ◽  
Ansys Software ◽  
Different Shapes

Abstract This paper presents numerical analyses and a physical experiment on efficiency of different shapes and material composition of piezo actuators on vibration reduction. For this purpose numerical models of a plate clamped on all sides with piezo actuators attached were developed. The elements used were either standard homogeneous elements or the proposed two-part elements with different material composition for inner and outer part of piezo ceramic. Numerical analyses were performed using ANSYS software

Experimental Investigation and Numerical Simulation of Gas Ejector in a Combustor With Combustion Gases Recirculation

2003 ◽  
Author(s):  
Kumpeng Zhang ◽  
Fei Xue ◽  
Weiming Pan ◽  
Zhihua Fan
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
High Pressure ◽  
Area Ratio ◽  
Gas Pressure ◽  
Pressure Condition ◽  
Combustion Gases ◽  
Ejection Coefficient ◽  
Pressure Changes ◽  
The Relationship

Sets of high-pressure ejection experiment were conducted to investigate the implementing of gases ejector with high-pressure condition. Numerical simulation was used to extend the study and overcome the limit of experiment facilities. Experiment shows that ejection coefficient of gases ejector was not sensitive to supply gas pressure changes. But which was affected greatly by backpressure in mixing cavity of ejector, as shown by simulation. The simulation result also implies that there are inherent relation between ejection coefficient, area ratio at inlet of mixing cavity and pressure different between supply gas pressure and the backpressure. And the relationship determines that in some range, the implementing of gas ejector was unstable.

Experimental Study on the Hydrodynamic Characteristics of Artificial Reefs

2019 ◽  
Author(s):  
FenFang Zhao ◽  
Muk Chen Ong ◽  
Yanli Tang ◽  
Xinmeng Wang
Keyword(s):  
Experimental Study ◽  
Drag Coefficient ◽  
Coastal Ecosystems ◽  
Hydrodynamic Forces ◽  
Area Ratio ◽  
Artificial Reefs ◽  
Hydrodynamic Characteristics ◽  
Open Area ◽  
Model Experiments ◽  
Different Shapes

Abstract Artificial reefs (ARs) are structures constructed on the seabed to attract and concentrate fish and to potentially improve and rehabilitate coastal ecosystems. In order to investigate the hydrodynamic characteristics of ARs, a series of model experiments of cubic artificial reefs are carried out in the flume. The model reefs are made of acrylic material with different shapes of opening and various open-area ratios. The hydrodynamic forces of the models are measured in the experiments. The changes of drag coefficient with respect to the open-area ratio and the flow-facing angle of attack are investigated and discussed respectively.

scholarly journals The use of Catastrophe Theory to Analyse the Stability and Toppling of Icebergs

1980 ◽  
Vol 1 ◽  
pp. 49-54 ◽  
Author(s):  
J. F. Nye ◽  
J. R. Potter
Keyword(s):  
Catastrophe Theory ◽  
Three Dimensional ◽  
Theory Approach ◽  
Rectangular Section ◽  
Small Oscillations ◽  
Density Distributions ◽  
Conceptual Clarity ◽  
Different Shapes ◽  
The Stability ◽  
The Individual

As an iceberg melts, the resulting change of shape can cause it to list gradually or to become unstable and topple over suddenly. Similarly, when an iceberg breaks up some of the individual pieces may capsize. We have used Zeeman’s analysis of the stability of ships, which is based on catastrophe theory, to examine this problem. We deal only with statical equilibrium; dynamical effects induced by water motion are important for ships, but very large icebergs have correspondingly small oscillations and therefore dynamical aspects are ignored in this first study. The advantage of the catastrophe-theory approach over the conventional stability theory used by naval architects lies in the conceptual clarity that it provides. In particular, it gives a three-dimensional geometrical picture that enables one to see all the possible equilibrium attitudes of a given iceberg, whether they are stable or unstable, whether a stable attitude is dangerously close to an unstable one, and how positions of stable equilibrium can be destroyed as the shape of the iceberg evolves with time.By making two-dimensional computations we examine the stability of two different shapes of cross-section, rectangles and trapezia, with realistic density distributions. These shapes may list gradually or topple suddenly as a single parameter is changed. For example, we find that a conversion of the vertical sides of a rectangular section into the slightly inward-sloping sides of a trapezium has a comparatively large adverse effect on stability. The main purpose of this work is to suggest how the stability characteristics of any selected iceberg may be investigated systematically.

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