Effect of Pouring Temperature on Microstructures and Mechanical Properties of 7085 Ingot Casting by Finite Element Analysis

2021 ◽  
Vol 904 ◽  
pp. 39-46
Author(s):  
Duan Zhi Wang ◽  
Hong Bang Shao ◽  
Zhen Zhong Fan ◽  
Jun Zhou Chen ◽  
Yuan Chun Huang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Simulation Analysis ◽  
Fem Simulation ◽  
Ingot Casting ◽  
Pouring Temperature ◽  
Element Analysis ◽  
Gradient Distribution ◽  
Metallurgical Defects ◽  
Test Process

The microstructure and mechanical properties of the 7085 ingot casting was tested by OM, SEM and EDS, the fatigue damage was observed in the driving test process, the temperature gradient distribution was adjusted observably by using the FEM simulation analysis. By adjusting the pouring temperature, many micro shrinkage metallurgical defects were eliminated, the tensile strength, yield strength and elongation were raised to 498MPa, 362MPa and 7.4% at the T6 heat treatment state.

Design and Simulation of Fully Mechanized Hydraulic Support

2014 ◽  
Vol 644-650 ◽  
pp. 199-202
Author(s):  
Pei Qin Wang ◽  
Zeng Shun Xu ◽  
Zuo Feng Sun ◽  
Hui Yuan Jiang
Keyword(s):  
Mechanical Properties ◽  
Mathematical Model ◽  
Mechanical Model ◽  
Simulation Analysis ◽  
Virtual Prototype ◽  
Dynamics Simulation ◽  
Prototype Model ◽  
Design Calculation ◽  
Hydraulic Support ◽  
Element Analysis

Based on theoretical calculation, virtual prototype technology and the method of finite element analysis, the fully mechanized hydraulic support is designed and simulated. Firstly, the four-link mechanism of hydraulic support mechanical model and mathematical model are established, the demission is confirmed by design calculation of structure. Secondly, through the establishment of rigid parameterized virtual prototype model of the system, dynamics simulation analysis and research is finished based on ADAMS on the mechanical properties. Finally, based on FEA, the modal calculation of key components is completed by using ANSYS.

Discrete Element Method Analysis of Mechanical Properties of Railway Ballast during Tamping Process under Different Amplitude

2012 ◽  
Vol 233 ◽  
pp. 224-227 ◽  
Author(s):  
Tao Yong Zhou ◽  
Bin Hu ◽  
Xue Jun Wang ◽  
Bo Yan
Keyword(s):  
Mechanical Properties ◽  
Discrete Element Method ◽  
Simulation Analysis ◽  
Discrete Element ◽  
Practical Experience ◽  
Field Trials ◽  
Analysis Model ◽  
Railway Ballast ◽  
Element Analysis ◽  
Element Method

Railway ballast tamping operations is an important work in the line maintenance and repair operations, the selection of tamping parameter is usually dependent on field trials and practical experience, for the mechanical properties of railway ballast is difficult to measure and describe. This paper creates discrete element analysis model of railway ballast using the discrete element method, the numerical simulations are carried out to study the mechanical properties of railway ballast during tamping process. We focus on the influence of amplitude during tamping process; an optimal amplitude of the simulation analysis is obtained and compared with the recommended amplitude of Plasser & Theurer Company, it is found that the two amplitudes accord. This result verifies the correct validity of the discrete element analysis model of railway ballast during tamping process.

scholarly journals Effect of welding and heat treatment on the properties of UHSS used in automotive industry

2021 ◽  
Vol 250 ◽  
pp. 05015
Author(s):  
Gulshan Noorsumar ◽  
Dmitry Vysochinskiy ◽  
Even Englund ◽  
Kjell G. Robbersmyr ◽  
Svitlana Rogovchenko
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Automotive Industry ◽  
High Strength ◽  
Heat Treatments ◽  
Inert Gas ◽  
Element Analysis ◽  
Heat Treated ◽  
Ultra High Strength Steel ◽  
Metal Inert Gas Welding

This paper deals with the undesired effects of the heat treatments on the mechanical properties of (UHSS) Ultra High Strength Steel used nowadays in automotive industry to improve crashworthiness performance of vehicles. The UHSS specimens were extracted from certain parts of the car body and subjected to different heat treatments. Four types of specimens were tested: untreated, welded with metal inert gas welding, heat treated at 800 °C, and heat treated at 1250 °C. All heat-treated specimens showed dramatically reduced values of strength. The results suggest that it is important to follow the official repair manuals avoiding unnecessary welding and improper heat treatments of UHSS. The experiments provide the data necessary for constructing a constitutive model and performing a finite-element analysis of improperly repaired UHSS parts.

3D FEM Simulation Analysis for PBL Shear Connectors

2012 ◽  
Vol 170-173 ◽  
pp. 3449-3453 ◽  
Author(s):  
Zhang Liang Yu ◽  
Bing Zhu ◽  
Sheng Tan Dou ◽  
Wen Xiu Liu
Keyword(s):  
Bearing Capacity ◽  
Simulation Analysis ◽  
Failure Process ◽  
Fem Simulation ◽  
Ultimate Bearing Capacity ◽  
3D Fem ◽  
Element Analysis ◽  
Shear Connectors ◽  
Pull Out ◽  
Steel Bar

This paper analyze ultimate bearing capacity, transfer mechanism, failure process and influence of aperture, steel bar diameter, concrete rating and on elastic bearing capacity and ultimate bearing capacity of PBL shear connectors by the finite element analysis software ANSYS. This paper can provide a reference for further design of PBL shear connectors as well as push-out or pull-out test. The results show that the elasticity bearing capacity of PBL shear connectors is determined primarily by concrete while the ultimate bearing capacity is determined primarily by perforative steel bar.

Discrete Element Method Analysis of Mechanical Properties of Railway Ballast during Tamping Process under Different Vibration Frequency

2012 ◽  
Vol 190-191 ◽  
pp. 369-372
Author(s):  
Tao Yong Zhou ◽  
Bin Hu ◽  
Xue Jun Wang ◽  
Bo Yan
Keyword(s):  
Mechanical Properties ◽  
Discrete Element Method ◽  
Vibration Frequency ◽  
Simulation Analysis ◽  
Discrete Element ◽  
Field Trials ◽  
Analysis Model ◽  
Railway Ballast ◽  
Element Analysis ◽  
Element Method

Railway ballast tamping operations is an important work in the line maintenance and repair operations, the selection of tamping parameter is usually dependent on field trials and practical experience, for lack of theoretical basis. This paper creates discrete element analysis model of railway ballast using the discrete element method, the numerical simulations are carried out to study the mechanical properties of railway ballast during tamping process. We focus on the influence of vibration frequency during tamping process; an optimal vibration frequency of the simulation analysis is obtained and compared with the recommended vibration frequency of Plasser & Theurer Company, it is found that the two vibration frequencies accord. This result verifies the correct validity of the discrete element analysis model of railway ballast during tamping process.

Hot Tap Fittings: To Extrude or Fabricate

2017 ◽  
Author(s):  
Tommy McKone ◽  
Grant Cooper
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Finite Element Analysis ◽  
Extrusion Process ◽  
Controlled Rolling ◽  
Heated Plate ◽  
Fabrication Method ◽  
Element Analysis ◽  
Material Homogeneity ◽  
Modern Analysis

A common means of accessing a pipeline for such operations as diversions, new connections, maintenance, etc. is to use a hot tap. Hot taps are widely accepted in the industry and offer several advantages over shutting down the pipeline such as reducing production downtime, eliminating the loss of pipeline product and preventing unwanted carbon emissions. Split tee fittings (Fig. 1) are the most effective way to complete a hot tap and are designed in such a way that they can be left in place on the pipeline safely while minimizing future integrity risks and impact to operations. There are two ways in which these fittings can be manufactured; one is to use a welding fabrication method whereby a branch connection is welded to a run1 with associated opening. The second is to use an extrusion technique that forms heated plate or cylindrical shell into a tee shape. Techniques used in extrusion must be tightly controlled to ensure correct wall thickness, material homogeneity, mechanical properties, and geometric conformity. Fabricated fittings must have rigidly controlled rolling, cutting, welding, and heat treatment when applicable. This paper will present the advantages and challenges of both techniques and how modern analysis methods (Finite Element Analysis) helped in the development of a new extrusion process to overcome the issues associated with this method. The paper will also highlight what operators need to consider when choosing between an extruded or fabricated fitting.

Crystallization of MgO • Al2 • SiO2 • ZrO2 glasses

1986 ◽  
Vol 44 ◽  
pp. 440-441
Author(s):  
M. A. McCoy
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Powder Processing ◽  
Glass Composition ◽  
Ceramic Powder ◽  
Transformation Toughening ◽  
Ceramic Powder Processing ◽  
Processing Techniques ◽  
Ceramic Matrices

Transformation toughening by ZrO2 inclusions in various ceramic matrices has led to improved mechanical properties in these materials. Although the processing of these materials usually involves standard ceramic powder processing techniques, an alternate method of producing ZrO2 particles involves the devtrification of a ZrO2-containing glass. In this study the effects of glass composition (ZrO2 concentration) and heat treatment on the morphology of the crystallization products in a MgO•Al2•SiO2•ZrO2 glass was investigated.

INFLUENCE THE QUENCHING AND TEMPERING ON THE MICROSTRUCTURE, MECHANICAL PROPERTIES AND SURFACE ROUGHNESS, OF MEDIUM CARBON STEEL

2018 ◽  
Vol 18 (1) ◽  
pp. 125-135
Author(s):  
Sattar H A Alfatlawi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Surface Roughness ◽  
Carbon Steel ◽  
Cold Water ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Heating And Cooling ◽  
Treatment Processes ◽  
Quenching And Tempering

One of ways to improve properties of materials without changing the product shape toobtain the desired engineering applications is heating and cooling under effect of controlledsequence of heat treatment. The main aim of this study was to investigate the effect ofheating and cooling on the surface roughness, microstructure and some selected propertiessuch as the hardness and impact strength of Medium Carbon Steel which treated at differenttypes of heat treatment processes. Heat treatment achieved in this work was respectively,heating, quenching and tempering. The specimens were heated to 850°C and left for 45minutes inside the furnace as a holding time at that temperature, then quenching process wasperformed in four types of quenching media (still air, cold water (2°C), oil and polymersolution), respectively. Thereafter, the samples were tempered at 200°C, 400°C, and 600°Cwith one hour as a soaking time for each temperature, then were all cooled by still air. Whenthe heat treatment process was completed, the surface roughness, hardness, impact strengthand microstructure tests were performed. The results showed a change and clearimprovement of surface roughness, mechanical properties and microstructure afterquenching was achieved, as well as the change that took place due to the increasingtoughness and ductility by reducing of brittleness of samples.

Application of Coupled Structural Acoustic Analysis and Sensitivity Calculations to a Tire Noise Problem

2012 ◽  
Vol 40 (1) ◽  
pp. 25-41 ◽  
Author(s):  
H. M. R. Aboutorabi ◽  
L. Kung
Keyword(s):  
Performance Improvement ◽  
Acoustic Analysis ◽  
Simulation Analysis ◽  
Analysis Method ◽  
Vehicle Manufacturer ◽  
Element Analysis ◽  
Equipment Manufacturer ◽  
Tire Noise ◽  
Fea Modeling ◽  
Testing Instruments

Abstract REFERENCE: H. M. R. Aboutorabi and L. Kung, “Application of Coupled Structural Acoustic Analysis and Sensitivity Calculations to a Tire Noise Problem,” Tire Science and Technology, TSTCA, Vol. 40, No. 1, January – March 2012, pp. 25–41. ABSTRACT: Tire qualification for an original equipment (OE) program consists of several rounds of submissions by the tire manufacturer for evaluation by the vehicle manufacturer. Tires are evaluated both subjectively, where the tire performance is rated by an expert driver, and objectively, where sensors and testing instruments are used to measure the tire performance. At the end of each round of testing the evaluation results are shared and requirements for performance improvement for the next round are communicated with the tire manufacturer. As building and testing is both expensive and time consuming predictive modeling and simulation analysis that can be applied to the performance of the tire is of great interest and value. This paper presents an application of finite element analysis (FEA) modeling along with experimental verification to solve tire noise objections at certain frequencies raised by an original equipment manufacturer (OEM) account. Coupled structural-acoustic analysis method was used to find modal characteristics of the tire at the objectionable frequencies. Sensitivity calculations were then carried out to evaluate the strength of contribution from each tire component to the identified modes. Based on these findings changes to the construction were proposed and implemented that addressed the noise issue.

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