Continuous Beams of Aluminum Alloy Tubular Cross Sections. I: Tests and FE Model Validation

Coal gasification is a key technology for clean coal conversion with high efficiency. During the past decade, more than twenty Shell Key Gasification Equipments (SKGE) used in the Shell Coal Gasification Process (SCGP) have been built in coal-to-chemicals industry in China. SKGE is composed of Gasifier and Syngas cooler which are connected by Transfer duct. The support skirt of the Gasifier base is fixed, while the Syngas cooler side is supported by a constant hanger (floating support). In this paper, a FE model of the largest 2000-ton SKGE system in China is established by using ANSYS. The global dynamic response under the seismic load is simulated. In order to verify the correction of the calculation, the results are also compared with that by using ABAQUS. Compared to the traditional static analysis, it can be found that the deformation and stress distribution, the force and moment on several specified cross sections of SKGE change over time under seismic load based on the transient dynamic analysis. As the result of the seismic analysis is the prerequisite and foundation for accurate calculation of each key part (e.g. connection between Transfer duct and Gas reversal chamber), the seismic analysis is one of the most important analyses in the Gasification design, which will ensure the essential safety of SKGE system.

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NUMERICAL STUDY OF STRUCTURAL STEEL CONTINUOUS BEAMS WITH TUBULAR CROSS-SECTIONS

10.18057/icass2018.p.086 ◽

2018 ◽

Author(s):

Xiang Yun ◽

◽

Leroy Gardner ◽

Keyword(s):

Structural Steel ◽

Cross Sections ◽

Numerical Study ◽

Continuous Beams

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Design for Crashworthiness of Vehicle Structures via Equivalent Mechanism Approximations and Crush Mode Matching

Design Engineering ◽

10.1115/imece2004-62226 ◽

2004 ◽

Cited By ~ 6

Author(s):

Karim Hamza ◽

Kazuhiro Saitou

Keyword(s):

Cross Sections ◽

Surrogate Model ◽

Time History ◽

Fe Model ◽

Structural Members ◽

Direct Optimization ◽

Nonlinear Springs ◽

Crashworthiness Design ◽

Thin Walled ◽

Equivalent Mechanism

This paper presents a 3D extension to our previous work on vehicle crashworthiness design that utilizes “equivalent” mechanism models of vehicle structures as a tool for the early design exploration. An equivalent mechanism (EM) is a network of rigid links with lumped masses connected by prismatic and revolute joints with nonlinear springs, which approximate aggregated behaviors of structural members during crush. A number of finite element (FE) models of thin-walled beams with typical cross sections and wall thicknesses are analyzed to build a surrogate model that maps the beam dimensions to nonlinear spring properties. Using the surrogate model, an EM model is optimized for given design objectives by selecting the nonlinear springs among the ones realizable by thin-walled beams. The optimum EM model serves to identify a good crash mode (CM), the time history of collapse of the structural members, and to suggest the dimensions of the structural members to attain it. After the optimization, the FE model of an entire structure is “assembled” from the suggested dimensions, which is further modified to attain the good CM identified by the optimum EM model. A case study of a 3D vehicle front half body demonstrates that the proposed approach can help obtain good designs with far less computational resources than the direct optimization of a FE model.

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IV. On the practical solution of the most general problems in continuous beams

Proceedings of the Royal Society of London ◽

10.1098/rspl.1879.0074 ◽

1879 ◽

Vol 29 (196-199) ◽

pp. 493-505

Keyword(s):

Cross Section ◽

Cross Sections ◽

General Problem ◽

Bending Moment ◽

Moment Of Inertia ◽

Shearing Stress ◽

Practical Solution ◽

Continuous Beams ◽

The Moment

1. It is not necessary to enter into the question of the advisability of employing continuous girders in bridges with spans of less than 200 feet, but it is generally conceded that the increased economy due to the employment of continuous girders in longer spans more than counterbalances the well-known practical objections to continuity. Hence the practical solution of the general problem—given the conditions at the ends of a continuous girder, the spans, the moment of inertia of all cross sections, and the loading, to find the bending moment and shearing stress in every cross-section, is not unworthy of our attention.

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Effects of Rotational Speed of Driver Roll on Hot Ring Rolling of 6061 Aluminum Alloy by 3D FE Simulation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.773.309 ◽

2013 ◽

Vol 773 ◽

pp. 309-315 ◽

Cited By ~ 1

Author(s):

Lian Jie Li ◽

Xiao Dong Luo ◽

Yong Xiang Zhu

Keyword(s):

Aluminum Alloy ◽

Rotational Speed ◽

Rolling Process ◽

Ring Rolling ◽

Fe Model ◽

6061 Aluminum Alloy ◽

Hot Rolling Process ◽

Rolled Ring ◽

Force Contact

In this paper, a 3D elastic-plastic and coupled thermo-mechanical FE model of radial ring rolling of 6061 aluminum alloy is developed, and the hot rolling process with different the rotational speed of driver roll n is simulated by using the dynamic explicit code ABAQUS/Explicit. The influence laws of the rotational speed of driver roll on the uniformity of strain and temperature distribution (STD), fishtail coefficient, roll force, contact area and roll moment are revealed respectively. One optimum n is obtained, under which SDT is relatively uniform; meanwhile, another optimum n is obtained, under which the quality of end-plane of the rolled ring is the best. The result can provide a valuable guideline to research and optimum of the hot ring rolling of aluminum alloys.

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Microstructuring of joining areas in aluminum alloy sheets by Jet Electrochemical Machining

Technologies for Lightweight Structures (TLS) ◽

10.21935/tls.v1i2.80 ◽

2018 ◽

Vol 1 (2) ◽

Author(s):

Rene Schimmelpfennig ◽

Matthias Hackert-Oschätzchen ◽

André Martin ◽

Andreas Schubert

Keyword(s):

Shear Strength ◽

Aluminum Alloy ◽

Ultrasonic Vibration ◽

Cross Sections ◽

Electrochemical Machining ◽

Limited Area ◽

Tensile Shear Strength ◽

Tensile Shear ◽

Aluminum Sheets ◽

Jet Electrochemical Machining

In this work the increase of the tensile shear strength by means of microstructuring of the metallic part for ultrasonic vibration assisted joining of hybrid compounds is presented. The aluminum alloy EN AW-5083 and a carbon fibre-reinforced plastic (CFRP) from Bond Laminates are used as a material combination. A suitable method is electrochemical processing (ECM). The microstructuring is carried out with continuous electrolyte free jet machining (Jet-ECM): Characteristic of this technology is the restriction of the electric current to a limited area of the electrolyte jet. After describing the materials and sample geometry used, the Jet-ECM technology and the ultrasonic vibration assisted joining process are explained. The strength of the joint is assessed by means of a tensile shear test. The determined results of the tensile shear strength for hybrid connections between microstructured aluminum sheets and CFRP are compared with those of unstructured aluminum sheets. Furthermore, the influence of the microstructure on the tensile shear strength achieved is discussed using metallographic cross-sections of the joining area.

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Advanced FE model validation of cold-forming process using DIC: Air bending of high strength steel

International Journal of Material Forming ◽

10.1007/s12289-020-01536-1 ◽

2020 ◽

Vol 13 (3) ◽

pp. 409-421 ◽

Cited By ~ 1

Author(s):

S. Gothivarekar ◽

S. Coppieters ◽

A. Van de Velde ◽

D. Debruyne

Keyword(s):

Model Validation ◽

High Strength Steel ◽

High Strength ◽

Fe Model ◽

Forming Process ◽

Cold Forming ◽

Air Bending

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Experimental Investigation on Joining Dissimilar Aluminum Alloy 6061 to TRIP 780/800 Steel Through Friction Stir Welding

Journal of Engineering Materials and Technology ◽

10.1115/1.4030480 ◽

2015 ◽

Vol 137 (4) ◽

Cited By ~ 5

Author(s):

Xun Liu ◽

Shuhuai Lan ◽

Jun Ni

Keyword(s):

Aluminum Alloy ◽

Friction Stir Welding ◽

Cross Sections ◽

Failure Modes ◽

High Strength ◽

Tensile Tests ◽

Weld Strength ◽

Friction Stir ◽

Aluminum Alloy 6061 ◽

Alloy 6061

Friction stir welding (FSW) technique has been successfully applied to butt joining of aluminum alloy 6061-T6 to one type of advanced high strength steel (AHSS), transformation induced plasticity (TRIP) 780/800 with the highest weld strength reaching 85% of the base aluminum alloy. Mechanical welding forces and temperature were measured under various sets of process parameters and their relationships were investigated, which also helped explain the observed macrostructure of the weld cross section. Compared with FSW of similar aluminum alloys, only one peak of axial force occurred during the plunge stage. Three failure modes were identified during tensile tests of weld specimens, which were further analyzed based on the microstructure of joint cross sections. Intermetallic compound (IMC) layer with appropriate thickness and morphology was shown to be beneficial for enhancing the strength of Al–Fe interface.

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