Mechanical performance test and finite element analysis of prefabricated utility tunnel L‐shaped joint

Precast composite slabs are an essential component in concrete-prefabricated buildings. At present, there are problems such as overweightedness and imperfect test for quality and structural performance of the precast floors, leading to restriction in the development of prefabricated buildings. In this study, by using industrial solid-waste high-titanium heavy slag as coarse and fine aggregates, with fly ash and silica fume for the partial substitution of the cement, we developed a green lightweight precast composite slab of high-titanium heavy-slag concrete (LPCSHTHSC) after adding shale ceramite as the light aggregate. By selecting the weight and the strength of LPCSHTHSC as the technical control indexes, we performed an orthogonal test of lightweight proportions. Through a comprehensive analysis of the compressive strength, splitting tensile strength, density, and an economic consideration, the optimal proportion was determined as follows: water-to-binder ratio of 0.43, mixing amount of the fly ash of 4%, mixing amount of the silica fume of 8%, mixing amount of the water-reducing agent of 0.5%, sand ratio of 35%, and cement at the strength grade of 42.5. Next, the bending performance test was conducted on LPCSHTHSC. According to the results, the LPCSHTHSC exhibited excellent mechanical performance, and its ultimate bearing capacity far exceeded the designed value. The ultimate bearing capacity calculated using the plastic hinge wire method differed slightly from the test value, suggesting the applicability of the proposed method to the calculation of the ultimate bearing capacity. Finally, the finite element analysis results of LPCSHTHSC were consistent with the actual bending mechanical performance test results, which proved both the accuracy and the reliability of the present finite element analysis based on the plastic damage constitutive model. The present study can provide an insightful theoretical and test foundation for the lightweight application of high-titanium heavy-slag concrete in other prefabricated components.

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Finite Element Analysis on Behavior of Reinforced Hollow High Strength Concrete Filled Square Steel Tube Short Columns under Axial Compression

Journal of Physics Conference Series ◽

10.1088/1742-6596/2101/1/012059 ◽

2021 ◽

Vol 2101 (1) ◽

pp. 012059

Author(s):

Z J Yang ◽

X Li ◽

G C Li ◽

S C Peng

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

High Strength Concrete ◽

Mechanical Performance ◽

Concrete Strength ◽

High Strength ◽

Steel Tube ◽

Element Analysis ◽

Steel Strength ◽

Square Steel Tube

Abstract Hollow concrete-filled steel tubular (CFST) member is mainly adopted in power transmission and transformation structures, but when it is used in the superstructure with complex stress, the hollow CFST member has a low bearing capacity and is prone to brittle failure. To improve the mechanical performance of hollow CFST members, a new type of reinforced hollow high strength concrete-filled square steel tube (RHCFSST) was proposed, and its axial compression performance was researched. 18 finite element analysis (FEA) models of axially loaded RHCFSST stub columns were established through FEA software ABAQUS. The whole stress process of composite columns was studied, and parametric studies were carried out to analyze the mechanical performance of the member. Parameters of the steel strength, steel ratio, deformed bar and sandwich concrete strength were varied. Based on the simulation results, the stress process of members can be divided into four stages: elastic stage, elastoplastic stage, descending stage and gentle stage. With the increase of steel strength, steel ratio, the strength of sandwich concrete and the addition of deformed bars, the ultimate bearing capacity of members also increases. Additionally, the increment of those parameters will improve the ductility of the member, except for the sandwich concrete strength.

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Performance Test and Finite Element Analysis of Air Spring for Automobile

Transactions of the Korean Society of Mechanical Engineers A ◽

10.3795/ksme-a.2007.31.7.725 ◽

2007 ◽

Vol 31 (7) ◽

pp. 725-731 ◽

Cited By ~ 1

Author(s):

Shin Huh ◽

Chang-Soo Woo ◽

Houk-Seop Han ◽

Wan-Doo Kim ◽

Seong-Soo Kim

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Performance Test ◽

Air Spring ◽

Element Analysis

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New Dental Implant with 3D Shock Absorbers and Tooth-Like Mobility—Prototype Development, Finite Element Analysis (FEA), and Mechanical Testing

Materials ◽

10.3390/ma12203444 ◽

2019 ◽

Vol 12 (20) ◽

pp. 3444

Author(s):

Avram Manea ◽

Grigore Baciut ◽

Mihaela Baciut ◽

Dumitru Pop ◽

Dan Sorin Comsa ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Mechanical Testing ◽

Alveolar Bone ◽

Mechanical Performance ◽

Implant Design ◽

Element Analysis ◽

Prototype Development ◽

Second Stage ◽

Testing Protocol

Background: Once inserted and osseointegrated, dental implants become ankylosed, which makes them immobile with respect to the alveolar bone. The present paper describes the development of a new and original implant design which replicates the 3D physiological mobility of natural teeth. The first phase of the test followed the resistance of the implant to mechanical stress as well as the behavior of the surrounding bone. Modifications to the design were made after the first set of results. In the second stage, mechanical tests in conjunction with finite element analysis were performed to test the improved implant design. Methods: In order to test the new concept, 6 titanium alloy (Ti6Al4V) implants were produced (milling). The implants were fitted into the dynamic testing device. The initial mobility was measured for each implant as well as their mobility after several test cycles. In the second stage, 10 implants with the modified design were produced. The testing protocol included mechanical testing and finite element analysis. Results: The initial testing protocol was applied almost entirely successfully. Premature fracturing of some implants and fitting blocks occurred and the testing protocol was readjusted. The issues in the initial test helped design the final testing protocol and the new implants with improved mechanical performance. Conclusion: The new prototype proved the efficiency of the concept. The initial tests pointed out the need for design improvement and the following tests validated the concept.

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Capacity Analysis of PE Pipeline With Non-Planar Defect

Volume 6B: Materials and Fabrication ◽

10.1115/pvp2013-97616 ◽

2013 ◽

Author(s):

Weijie Jiang ◽

Jianping Zhao ◽

Dingyue Chen

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Constitutive Model ◽

Mechanical Performance ◽

Orthogonal Design ◽

Bending Moment ◽

Limit Load ◽

Capacity Analysis ◽

Element Analysis ◽

Load Factors

A tensile test of buried PE pipe is designed to test the mechanical performance. Then the constitutive model for the PE pipe can be established. The limit load of the PE pipe with local thinning defect can be studied with the method of combining the orthogonal design of experiment and finite element analysis. Then the factors of local thinning defect pipe limit load factors can be analyzed. The results show that the depth of the defect has a great effect on the limit load (internal pressure and bending moment) of PE pipe. The effects that the axial length of the defect and the circumferential length of the defect have on the limit load are not significant.

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Finite Element Analysis of Fixed Medial Malleolar Fractures

Volume 1B: Extremity; Fluid Mechanics; Gait; Growth, Remodeling, and Repair; Heart Valves; Injury Biomechanics; Mechanotransduction and Sub-Cellular Biophysics; MultiScale Biotransport; Muscle, Tendon and Ligament; Musculoskeletal Devices; Multiscale Mechanics; Thermal Medicine; Ocular Biomechanics; Pediatric Hemodynamics; Pericellular Phenomena; Tissue Mechanics; Biotransport Design and Devices; Spine; Stent Device Hemodynamics; Vascular Solid Mechanics; Student Paper and Design Competitions ◽

10.1115/sbc2013-14632 ◽

2013 ◽

Author(s):

Ruchi D. Chande ◽

John R. Owen ◽

Robert S. Adelaar ◽

Jennifer S. Wayne

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Mechanical Performance ◽

External Rotation ◽

Weight Bearing ◽

High Stress ◽

Ankle Injuries ◽

Deltoid Ligament ◽

Medial Malleolus ◽

Element Analysis

The ankle joint, comprised of the distal ends of the tibia and fibula as well as talus, is key in permitting movement of the foot and restricting excessive motion during weight-bearing activities. Medial ankle injury occurs as a result of pronation-abduction or pronation-external rotation loading scenarios in which avulsion of the medial malleolus or rupture of the deltoid ligament can result if the force is sufficient [1]. If left untreated, the joint may experience more severe conditions like osteoarthritis [2]. To avoid such consequences, medial ankle injuries — specifically bony injuries — are treated with open reduction and internal fixation via the use of plates, screws, wires, or some combination thereof [1, 3–4]. In this investigation, the mechanical performance of two such devices was compared by creating a 3-dimensional model of an earlier cadaveric study [5], validating the model against the cadaveric data via finite element analysis (FEA), and comparing regions of high stress to regions of experimental failure.

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