Finite element simulation of the one-pass inner spinning process of curved generatrix cone cylindrical parts and analysis of their microstructure

2020 ◽  
Vol 234 (9) ◽  
pp. 1786-1796
Author(s):  
Zengliang Hao ◽  
Junting Luo ◽  
Yongbo Jin ◽  
Jinheng Liu ◽  
Zhenjie Wang ◽  
...  
Keyword(s):  
Grain Size ◽  
Finite Element ◽  
Mechanical Performance ◽  
Phase Distribution ◽  
Fracture Morphology ◽  
Second Phase ◽  
Finite Element Software ◽  
Spinning Process ◽  
Cylindrical Parts ◽  
Thin Walled

A one-pass annealing–internal spinning is proposed to form a conical thin-walled shell with large curved generatrix. The structure of the blank used is designed based on product-size requirements. ABAQUS finite element software is used to simulate the internal spinning process of a conical thin-walled shell with large curved generatrix under small-end (process 1) and large-end (process 2) rotations. The microstructure of the products is subsequently analyzed. Results show that the spinning pressure of the skin part under process 1 is relatively stable, and that the strain and residual stress distribution are uniform, and the hardness and the mechanical performance is improved. The products of the two processes have an obvious circumferential fiber structure. The second phase grain size in the fracture morphology of the product formed under the process 1 is uniform, and its size is in the range of 2–6 µm. Whereas, the second phase distribution of the product formed under the process 2 is not uniform, the fine second phase grain size is in 1–2 µm, and the coarse second phase grain size is in 5–8 µm.

Methods, Models, and Assumptions Used in Finite Element Simulation of a Pilger Metal Forming Process

2003 ◽  
Author(s):  
John Martin
Keyword(s):  
Finite Element ◽  
Process Parameters ◽  
Manufacturing Process ◽  
Defect Formation ◽  
Process Parameter ◽  
Stress And Strain ◽  
Finite Element Software ◽  
Sensitivity Studies ◽  
Modelling Techniques ◽  
Thin Walled

The pilger process is a cold-worked mechanical process that combines the elements of extrusion, rolling, and upsetting for the formation of thin-walled tubes. This complex manufacturing process relies on the results of trial and error testing programs, experimental parameter sensitivity studies, and prototypical applications to advance the technology. This finite element modelling effort describes the methods, models, and assumptions used to assess the process parameters used to manufacture thin-walled tubing. The modelling technique breaks down the manufacturing process into smaller computer generated models representing fundamental process functions. Each of these models is linked with the overall process simulation. Simplified assumptions are identified and supporting justifications provided. This work represents proof of principle modelling techniques, using large deformation, large strain, finite element software. These modelling techniques can be extended to more extensive parameter studies evaluating the effects of pilger process parameter changes on final tube stress and strain states and their relationship to defect formation/propagation. Sensitivity studies on input variables and the process parameters associated with one pass of the pilger process are also included. The modelling techniques have been extended to parameter studies evaluating the effects of pilger process parameter changes on tube stress and strain states and their relationship to defect formation. Eventually a complex qualified 3-D model will provide more accurate results for process evaluation purposes. However, the trends and results reported are judged adequate for examining process trends and parameter variability.

Influence of Sandwich Damping on the Loss Factor of Multi-Plies Bellows

2010 ◽  
Vol 44-47 ◽  
pp. 2998-3002 ◽  
Author(s):  
Wei Ma ◽  
Yong Chao Lu ◽  
Yong Gang Liu ◽  
Ji Shun Li ◽  
Yu Jun Xue
Keyword(s):  
Finite Element ◽  
Loss Factor ◽  
Strain Energy ◽  
Vibration Isolation ◽  
Mechanical Performance ◽  
Finite Element Models ◽  
Modal Strain Energy ◽  
Modal Strain Energy Method ◽  
Thin Walled ◽  
Strain Energy Method

Multi-plies bellows is a kind of cylindrical thin-walled container with curved shape. It is effective in seal, energy storage and vibration isolation. In the paper, the modal loss factor of multi-plies bellows was analyzed based on the modal strain energy method. Then the finite element models of multi-piles bellows were given by ANSYS. The mechanical performance of bellows was analyzed in detail. The strain energy distribution of multi-plies bellows and viscoelsticity layer were given. According to the strain energy, the influence of sandwich damping on the loss factor was studied. The results show that the loss factor can be improved by employing the sandwich damping with big thickness and elastic modulus 200MPa.

Mechanical Performance Analysis of Petroleum Derrick Substructure

2011 ◽  
Vol 105-107 ◽  
pp. 2121-2124
Author(s):  
Jun Feng Pei ◽  
Sheng Ying Deng ◽  
Guang Min Chen ◽  
Jian Zhang
Keyword(s):  
Finite Element ◽  
Mechanical Performance ◽  
Three Dimensional ◽  
Element Model ◽  
Structural Testing ◽  
Static Properties ◽  
Finite Element Software ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Project Structure

In recent years, the self-elevating derrick substructure which with the characteristics of easy to install、remove and transfer are gradually replacing layer box, box block substructure, etc. The three-dimensional finite element model of the MXD-701 jack-up derrick and substructure, which is used to analyze static properties of the petroleum substructure under the six different working loads are built by the ANSYS finite element software. Meanwhile, the wireless structural testing system（STS-WiFi）is testing at the MXD-701 petroleum substructure. Then comparing of the model results and testing results. Analysis results indicate that the stress of the substructure at the two beam table is greatest, the stress of the upper part of the guy column is much greater, and others are low, but in general, the overall substructure can fit the requirements of the strength and intensity. The compared results can accurately reflect the project structure of the stress and strain. Then, we can get the capacity of the substructure in order to provide evidence to the security situation of the substructure. It will have great significance to enrich and develop the mast base design and safety assessment theory.

Analyze the Impact of the Thin-Walled Hollow Pier by Construction of Reservoir

2013 ◽  
Vol 438-439 ◽  
pp. 1262-1264
Author(s):  
Ke Dong Tang ◽  
Feng Gui Jin
Keyword(s):  
Finite Element ◽  
Realistic Model ◽  
Finite Element Software ◽  
Before And After ◽  
Reservoir Construction ◽  
Thin Walled ◽  
The Impact

The river dam intends to build at 280m downstream of a built bridge. This paper, using ANSYS finite element software, establishes a rational and realistic model to analyze the influence of the reservoir construction on the thin-walled hollow pier of built bridge. The variation of the stress of the bridge thin-walled hollow pier before and after impounding of the reservoir is given out, which can be as a guidance for future reinforcing the thin-walled hollow pier.

scholarly journals Collapse Behaviour of a Concrete-Filled Steel Tubular Column Steel Beam Frame under Impact Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Lian Song ◽  
Hao Hu ◽  
Jian He ◽  
Xu Chen ◽  
Xi Tu
Keyword(s):  
Finite Element ◽  
Impact Loading ◽  
Mechanical Performance ◽  
Impact Load ◽  
Frame Structure ◽  
Actual Condition ◽  
Transverse Impact ◽  
Time Curve ◽  
Finite Element Software ◽  
The Impact

The progressive collapse of a concrete-filled steel tubular (CFST) frame structure is studied subjected to impact loading of vehicle by the finite-element software ABAQUS, in the direct simulation method (DS) and alternate path method (AP), respectively. Firstly, a total of 14 reference specimens including 8 hollow steel tubes and 6 CFST specimens were numerically simulated under transverse impact loading for verification of finite-element models, which were compared with the existing test results, confirming the overall similarity between them. Secondly, a finite-element analysis (FEA) model is established to predict the impact behaviour of a five-storey and three-span composite frame which was composed of CFST columns and steel beams under impact vehicle loading. The failure mode, internal force-time curve, displacement-time curve, and mechanical performance of the CFST frame were obtained through analyzing. Finally, it is concluded that the result by the DS method is closer to the actual condition and the collapse process of the structure under impact load can be relatively accurately described; however, the AP method is not.

scholarly journals Numerical analysis of concrete-filled spiral welded stainless steel tubes subjected to compression

2018 ◽  
Author(s):  
Dongxu Li ◽  
Brian Uy ◽  
Farhad Aslani ◽  
Chao Hou
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Finite Element Model ◽  
Mechanical Performance ◽  
Load Capacity ◽  
Element Model ◽  
Experimental Program ◽  
Design Parameters ◽  
Steel Tubes ◽  
Finite Element Software

Spiral welded stainless tubes are produced by helical welding of a continuous strip of stainless steel. Recently, concrete-filled spiral welded stainless steel tubes have found increasing application in the construction industry due to their ease of fabrication and aesthetic appeal. However, an in-depth understanding of the behaviour of this type of structure is still needed due to the lack of proper design guidance and insufficient experimental verification. In this paper, the mechanical performance of concrete-filled spiral welded stainless steel tubes will be numerically investigated with a commercial finite element software package, through which an experimental program can be designed properly. Specifically, the proposed finite element models take into account the effects of material and geometric nonlinearities. Moreover, the initial imperfections of stainless steel tubes and the form of helical welding will be appropriately included. Enhancement of the understanding of the analysis results can be achieved by extending results through a series of parametric studies based on the developed finite element model. Thus, the effects of various design parameters will be further evaluated by using the developed finite element model. Furthermore, for the purposes of wide application of such types of structure, the accuracy of the behaviour prediction in terms of ultimate strength based on current design codes will be studied. The authors herein compared the load capacity between the finite element analysis results and the existing codes of practice.

Law of Metal Flow of Thin-Walled Conical Part With Variable Section During Spinning

2020 ◽  
Author(s):  
Shu Xuedao ◽  
Xia Yingxiang ◽  
Zhu Ying ◽  
Li Zixuan ◽  
Ye Bohai
Keyword(s):  
Metal Flow ◽  
Conical Part ◽  
Forming Process ◽  
Finite Element Software ◽  
Axial Tensile ◽  
Variable Section ◽  
Spinning Process ◽  
Thin Walled ◽  
Forming Defects

Abstract During the spinning process of the variable-section thin-walled conical parts, the metal flow law is relatively complicated and the flange is prone to be unstable, which resulting in wrinkling and other defects. In this paper, the variable-section conical part of superalloy GH1140 is taken as the research object. The spinning forming process is numerically simulated by using Simufact Finite Element software and the metal flow in each stage of the forming process is analyzed. The flow velocity shows an annular distribution as a whole. The metal near the center of the circle flows more slowly, and the metal far from the circular flange flows more quickly. In the direction of thickness, the velocity of metal flow decreases gradually. Under the feeding action of the roller, the metal in front of the roller is subjected to axial tensile stress, tangential and radial compressive stress, resulting in a strain state of one-way tension and two-way compression. The metal moves along the negative direction of the rotary wheel feed, resulting in the increase of the sheet wall thickness. The correctness of the model in this paper is further verified by spinning experiments. The research results provide a theoretical basis for analyzing the mechanism of forming defects and improving the quality of spinning forming of conical thin-walled parts with variable sections.

Analysis on Stability of the Short-Pylon Cable-Stayed Bridge

2013 ◽  
Vol 353-356 ◽  
pp. 3640-3644
Author(s):  
Hai Ying Wen ◽  
Yang Liu ◽  
Gang Yang
Keyword(s):  
Finite Element ◽  
Free Standing ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Thin Walled ◽  
The Stability ◽  
Main Girder

This thesis took the Changshan Bridge in Dalian Changhai county as an example and adopted the general finite element software ANSYS to simulate it. Analyzed the stability of the completed bridge and the single free-standing tower state, and studied the buckling of the main girder and the thin-walled pier.

Numerical Analysis on Performance of Frame-Shear Structure with High Pile under Complex Load

2014 ◽  
Vol 1044-1045 ◽  
pp. 650-653
Author(s):  
Jing Ping Yang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Mechanical Performance ◽  
Wave Force ◽  
Offshore Structures ◽  
Complex Load ◽  
Finite Element Software ◽  
Pile Caps ◽  
Shear Structure ◽  
Supporting Frame

In order to acquire mechanical performance of High cap supporting frame-shear structure, in view of the sea high cap supporting frame-shear theory analysis and numerical simulation of structure is less, this paper performs numerical simulation analysis for pile caps-soil-the upper structure using the finite element software ANSYS. Expression equation of wave force is given, and three-dimensional finite element model is established. By Analysis the deformation and stress of pile foundation and pile caps under different load combinations are obtained, and the deformation, bending moment of pile top, axial force are checked, finally the feasibility of the system is verified, and these can provide a reliable basis and reference for reasonable design of offshore structures. High cap supporting frame-shear structure for its strong adaptability is widely used in offshore construction system.

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