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Now showing 1 - 10 of 22

Numerical solution of active earth pressures on rigid retaining walls built near rock faces
(2010-11-01)
Fan, Chia-Cheng
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Fang, Yung-Show
;
土木工程學系
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Department of Civil Engineering
For retaining walls built in mountainous regions, narrow backfill spaces are often encountered. The space to fully develop the active wedge is restricted for walls with a limited backfill space. This paper presents a numerical study on the behaviour of active earth pressures behind a rigid retaining wall with limited backfill space of various geometries. The active earth pressure for a wall built with limited backfill space is considerably less than that of the Coulomb solution, and the location of the resultant of active earth pressures is noticeably higher than one-third of the wall height. The coefficient of active earth pressures is as low as 0.5-0.6 times the Coulomb solution and the h/H value reaches up to 0.4-0.37 if aspect ratio of the fill space is in the range from 0.1 to 0.2. A clear trend between the ratio of the coefficient of active earth pressures at constrained fill conditions over the Coulomb K(a) value and the aspect ratio of the fill-space geometry is obtained. (C) 2010 Elsevier Ltd. All rights reserved.
Experimental Platforms and Die Design for Hot Stamping of a Patchwork Blank
(2017-01-01)
Chen, F. K.
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Hung, T. H.
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Hung, C. H.
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Huang, T. B.
;
Chen, T. R.
The hot stamping of a patchwork blank is one of the forming processes being applied to manufacture automobile structural parts. In order to perform the finite element analysis for patchwork blank hot stamping process, the material behavior of blank and interface parameters between blank and tools are required in the finite element model. In this paper, the experimental platforms for obtaining interface parameters including coefficient of friction and interface heat transfer coefficient were established. Then, the finite element analysis model for patchwork blank hot stamping process was constructed. The forming mechanisms, stamping die design, and cooling system design were also examined in this study. Finally, the experimental interface parameters and stamping die design were applied to the finite element analysis for the hot stamping of a patchwork part.
Biomechanical evaluation of reconstruction plates with locking, nonlocking, and hybrid screws configurations in calcaneal fracture: a finite element model study
(2017-10-01)
Chen, Ching-Hsuan
;
Hung, Chinghua
;
Hsu, Yu-Chun
;
Chen, Chen-Sheng
;
Chiang, Chao-Ching
Calcaneal fractures are the most common fractures of the tarsal bones. The stability of fixation is an important factor for successful reconstruction of calcaneal fractures. The purpose of this study was to analyze the biomechanical influence of plate fixation with different combinations of locking and nonlocking screws during early weight-bearing phase. A three-dimensional FE foot model was established using ANSYS software, which comprised bones, cartilages, plantar fascia, and soft tissue. Calcaneal plate was fixed with whole locking (WLS), whole nonlocking (WNS), and hybrid screw configurations for FE analysis. The WNS generated a 6.1A degrees and 2.2A degrees Bohler angle decrease compared with the intact model and WLS (WNS: 18.9; WLS: 21.1; intact: 25.0A degrees). Some hybrid screw configurations (Bohler angle: 21.5A degrees and 21.2A degrees) generated stability similar to WLS. The FE results showed that the fragments at the posterior facet and the posterior tuberosity sustained more stress. This study recommends that the hybrid screw configuration with at least four locking screws, two at the posterior facet fragment and two at the posterior tuberosity fragment, is the optimal choice for the fixation of Sanders type IIB calcaneal fractures.
Finite Element Analysis of Tongue Type Calcaneal Fracture with Open Reduction and Internal Fixation with Locking Plate
(2018-02-01)
Chen, Ching-Hsuan
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Huang, Yu-Hsuan
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Hung, Chinghua
;
Chen, Chen-Sheng
;
Chiang, Chao-Ching
Open reduction and internal fixation (ORIF) with plate is the standard treatment for displaced intra-articular calcaneal fractures. We constructed a three-dimensional complete foot finite element model, which was also modified to evaluate the biomechanical effect of Sanders IIB tongue-type calcaneal fracture treated by ORIF with locking plate. We compared plates with locking screws (LSs) and those with non-locking screws (NSs). Static standing was simulated by applying ground reaction force and the pulling force of the Achilles tendon. ORIF with plate using NS or LS provided good stability for Sanders IIB tongue-type calcaneal fracture and might allow light touch weight-bearing in the early postoperative period.
Biomechanical Analysis of Implanted Clavicle Hook Plates With Different Implant Depths and Materials in the Acromioclavicular Joint: A Finite Element Analysis Study
(2016-11)
Lee, Cheng-Hung
;
Shih, Cheng-Min
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Huang, Kui-Chou
;
Chen, Kun-Hui
;
Hung, Li-Kun
Clinical implantation of clavicle hook plates is often used as a treatment for acromioclavicular joint dislocation. However, it is not uncommon to find patients that have developed acromion osteolysis or had peri-implant fracture after hook plate fixation. With the aim of preventing complications or fixation failure caused by implantation of inappropriate clavicle hook plates, the present study investigated the biomechanics of clavicle hook plates made of different materials and with different hook depths in treating acromioclavicular joint dislocation, using finite element analysis (FEA). This study established four parts using computer models: the clavicle, acromion, clavicle hook plate, and screws, and these established models were used for FEA. Moreover, implantations of clavicle hook plates made of different materials (stainless steel and titanium alloy) and with different depths (12, 15, and 18mm) in patients with acromioclavicular joint dislocation were simulated in the biomechanical analysis. The results indicate that deeper implantation of the clavicle hook plate reduces stress on the clavicle, and also reduces the force applied to the acromion by the clavicle hook plate. Even though a clavicle hook plate made of titanium alloy (a material with a lower Young\'s modulus) reduces the force applied to the acromion by the clavicle hook plate, slightly higher stress on the clavicle may occur. The results obtained in this study provide a better reference for orthopedic surgeons in choosing different clavicle hook plates for surgery.
Coupled lateral and torsional vibrations of the micro-drilling spindle systems
(2016-11)
Lee, An-Chen
;
Tien-Dat Hoang
;
機械工程學系
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Department of Mechanical Engineering
In this research, the coupled lateral and torsional micro-drilling spindle system was analyzed by the finite element method (FEM). The Timoshenko beam finite element with five degrees of freedom at each node is applied to perform dynamic analysis of the system containing cylinder, conical symmetric elements, and flute asymmetric elements. The three-dimensional flute of the Union MDS drill with 0.1 mm diameter is defined by specifying the Cartesian coordinates of the specific points. In addition, the system model comprehensively includes the effects of continuous mass eccentricity, shear deformation, gyroscopic moments, and rotational inertia with external thrust force and torque during machining. In particular, the consideration of continuous mass eccentricity gives a more realistic model for system investigation. The Hamilton\'s equations of the system involving both symmetric and asymmetric elements were established and utilized to find shape functions of each element. The transient and steady-state lateral and torsional responses of drill point were estimated by Newmark\'s method. Simulation studies were attentively conducted to investigate the coupled lateral and torsional effect on the system vibration behavior. The results show that during design stage, the coupled lateral and torsional vibration associated with the above external forces should be considered carefully to prevent unexpected damage to the spindle system.
Quasi-static buckling and first-ply failure loads of shear web reinforced glass-fabric composite wind blades
(2017-01-15)
Kam, T. Y.
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Su, H. M.
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Huang, C. Y.
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機械工程學系
;
Department of Mechanical Engineering
A procedure is proposed to analyze the structural failure of a composite wind blade subjected to quasi-static loads. The structural failure of a wind blade under extreme wind loads which can be treated as quasi-static loads is an important issue to be tackled when assessing the reliability of a wind turbine. In the proposed structural failure analysis procedure, the geometrically nonlinear finite element (FE) method together with several phenomenological failure criteria is used to investigate the possible failure modes such as incipient buckling, interfacial debonding, and first-ply failure of the blade via an incremental loading approach. The failure loads and locations associated with the possible failure modes for a number of small wind blades with different structural configurations are determined to study the appropriateness of the failure criteria. Static tests of several small glass-fabric composite wind blades were conducted to validate the suitability of the proposed procedure. It has been shown that the experimentally and theoretically predicted failure processes of the wind blades are in good agreement. The applications of the proposed procedure are demonstrated by means of a numerical example in which the failure process of a wind blade under quasi-static wind loads is simulated. (C) 2016 Elsevier Ltd. All rights reserved.
Biomechanical investigation into the structural design of porous additive manufactured cages using numerical and experimental approaches
(2016-09-01)
Tsai, Pei-I
;
Hsu, Ching-Chi
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Chen, San-Yuan
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Wu, Tsung-Han
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Huang, Chih-Chieh
Traditional solid cages have been widely used in posterior lumbar interbody fusion (PLIF) surgery. However, solid cages significantly affect the loading mechanism of the human spine due to their extremely high structural stiffness. Previous studies proposed and investigated porous additive manufactured (AM) cages; however, their biomechanical performances were analyzed using oversimplified bone-implant numerical models. Thus, the aim of this study was to investigate the outer shape and inner porous structure of the AM cages. The outer shape of the AM cages was discovered using a simulation based genetic algorithm; their inner porous structure was subsequently analyzed parametrically using T10-S1 multilevel spine models. Finally, six types of the AM cages, which were manufactured using selective laser melting, were tested to validate the numerical outcomes. The subsidence resistance of the optimum design was superior to the conventional cage designs. A porous AM cage with a pillar diameter of 0.4 mm, a pillar angle of 40 degrees, and a porosity of between 69% and 80% revealed better biomechanical performances. Both the numerical and experimental outcomes can help surgeons to understand the biomechanics of PLIF surgery combined with the use of AM cages. (C) 2016 Elsevier Ltd. All rights reserved.
Biomechanical analysis of acromioclavicular joint dislocation treated with clavicle hook plates in different lengths
(2015-11-01)
Shih, Cheng-Min
;
Huang, Kui-Chou
;
Pan, Chien-Chou
;
Lee, Cheng-Hung
;
Su, Kuo-Chih
Clavicle hook plates are frequently used in clinical orthopaedics to treat acromioclavicular joint dislocation. However, patients often exhibit acromion osteolysis and per-implant fracture after undergoing hook plate fixation. With the intent of avoiding future complications or fixation failure after clavicle hook plate fixation, we used finite element analysis (FEA) to investigate the biomechanics of clavicle hook plates of different materials and sizes when used in treating acromioclavicular joint dislocation. Using finite element analysis, this study constructed a model comprising four parts: clavicle, acromion, clavicle hook plate and screws, and used the model to simulate implanting different types of clavicle hook plates in patients with acromioclavicular joint dislocation. Then, the biomechanics of stainless steel and titanium alloy clavicle hook plates containing either six or eight screw holes were investigated. The results indicated that using a longer clavicle hook plate decreased the stress value in the clavicle, and mitigated the force that clavicle hook plates exert on the acromion. Using a clavicle hook plate material characterized by a smaller Young\'s modulus caused a slight increase in the stress on the clavicle. However, the external force the material imposed on the acromion was less than the force exerted on the clavicle. The findings of this study can serve as a reference to help orthopaedic surgeons select clavicle hook plates.
Subassemblage tests and finite element analyses of sandwiched buckling-restrained braces
(2010-08-01)
Chou, Chung-Che
;
Chen, Sheng-Yang
;
土木工程學系
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Department of Civil Engineering
This study presents the experimental and finite element analysis results of a proposed steel buckling-restrained brace (BRB). The proposed BRB has two components: (1) a steel core plate that carries all axial forces during tension and compression, and (2) two identical restraining members that sandwich the core plate with fully tensioned high-strength A490 bolts to prevent core buckling. Instead of using unbonded material, a small air gap is provided between the core plate and the restraining members to allow for lateral expansion of the core plate under compression. Since two restraining members can be disassembled easily by removing the bolts, a damaged steel core can be replaced after a large earthquake. Thus, manufacturing new restraining members is not required. Four BRB subassemblages were tested to investigate the inelastic deformation capabilities and verify the stability predictions for the braces. Test results indicate that three BRBs with sufficient flexural rigidity of the restraining member develop (1) stable hysteretic responses up to core axial strains of 2.1%-2.6%, (2) maximum compressive loads of 1724-1951 kN (1.4-1.6 times the actual yield load), and (3) a cumulative plastic ductility that is much higher than that specified in AISC seismic provisions (2005). One BRB, intentionally designed with inadequate flexural rigidity of the restraining member, experienced global buckling as predicted. Nonlinear finite element analysis was conducted for each BRB for a correlation study. The objective of the analysis was to conduct a parametric study for different BRBs to further verify the effects of restraining member size, number of bolts, core plate length and cross-sectional area on buckling load evaluation. The design procedure for the sandwiched BRB was provided based on test and finite element analysis results. (C) 2010 Elsevier Ltd. All rights reserved.

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