Analysis of temperature rise for piezoelectric transformer using finite-element method

2006 ◽  
Vol 53 (8) ◽  
pp. 1449-1457 ◽  
Author(s):  
Hyun-Woo Joo ◽  
Chang-Hwun Lee ◽  
Jong-Seok Rho ◽  
Hyun-Kyo Jung
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Rise ◽  
Piezoelectric Transformer ◽  
Element Method

Stress Analysis of a Tire Under Vertical Load by a Finite Element Method

1977 ◽  
Vol 5 (2) ◽  
pp. 102-118 ◽  
Author(s):  
H. Kaga ◽  
K. Okamoto ◽  
Y. Tozawa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Computer Program ◽  
Temperature Rise ◽  
Strain Energy ◽  
Internal Stresses ◽  
Vertical Load ◽  
The Finite Element Method ◽  
Internal Temperature ◽  
Element Method

Abstract An analysis by the finite element method and a related computer program is presented for an axisymmetric solid under asymmetric loads. Calculations are carried out on displacements and internal stresses and strains of a radial tire loaded on a road wheel of 600-mm diameter, a road wheel of 1707-mm diameter, and a flat plate. Agreement between calculated and experimental displacements and cord forces is quite satisfactory. The principal shear strain concentrates at the belt edge, and the strain energy increases with decreasing drum diameter. Tire temperature measurements show that the strain energy in the tire is closely related to the internal temperature rise.

scholarly journals Temperature Rise at the Pulp-Dentin Junction for a Multi-Layered Composite Restoration using the Finite Element Method

2021 ◽  
Vol 15 (1) ◽  
pp. 487-494
Author(s):  
Ali Mohammed Ridha ◽  
Konstantinos Aidinis ◽  
Abdul Haq Suliman
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Rise ◽  
Temperature Increase ◽  
Thermal Injury ◽  
Layered Composite ◽  
Curing Process ◽  
Light Curing ◽  
Composite Restoration ◽  
Element Method

Objectives: During the light-curing process of composite restoration, excessive heat can be produced, which can potentially lead to pulp necrosis (death). In this study, we aimed, based on the Finite Element Method (FEM), to assess the risk of pulp damage during the light-curing process by investigating the influence of light-curing devices, under various irradiation regimes, on the temperature increase at the pulp-dentin junction, during a one-layer or multi-layered deep composite restoration. Methods: A Three-dimensional finite element method model of typical geometry and material properties, as commonly reported in the literature, was employed in COMSOL Multiphysics simulations in order to determine the temperature increase in the pulp. Various combinations of light intensities, durations, and irradiation regimes were investigated for the two cases, of shallow and deep multi-layered composite restoration. Results: Results of light-curing composite resins within enamel; indicate that the temperature rise during the curing process was within the safety margins. Results of light-curing composite resin restorations closer to the pulp with thin remaining dentin, indicate a temperature increase that could be sufficient to cause thermal injury in the pulp. Modulating the light output marginally, reduced the temperature rise while reducing the intensity and increasing the curing duration which was consistently more effective in this respect. Conclusion: The results clearly demonstrate that with currently adopted standard procedures, there exists a risk of thermal injury during multi-layered composite restorations with thin remaining dentin; it is thus important to establish appropriate curing regimes that would lead to minimal temperature increase during deep composite restorations and hence reduce the risk of thermal injury to the pulp.

Simulation of the temperature field for massive concrete structures using an interval finite element method

2020 ◽  
Vol 37 (7) ◽  
pp. 2467-2486
Author(s):  
Zhiqiang Xie ◽  
Lei Wang ◽  
Zhengyang Zhu ◽  
Zhi Fu ◽  
Xingdong Lv
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Temperature Rise ◽  
Adiabatic Temperature ◽  
Monitoring Data ◽  
Adiabatic Temperature Rise ◽  
Content Type ◽  
Interval Finite Element Method ◽  
Element Method

Purpose The purpose of this paper is to introduce an interval finite element method (IFEM) to simulate the temperature field of mass concrete under multiple influence uncertainties e.g. environmental temperature, material properties, pouring construction and pipe cooling. Design/methodology/approach Uncertainties of the significant factors such as the ambient temperature, the adiabatic temperature rise, the placing temperature and the pipe cooling are comprehensively studied and represented as the interval numbers. Then, an IFEM equation is derived and a method for obtaining interval results based on monotonicity is also presented. To verify the proposed method, a non-adiabatic temperature rise test was carried out and subsequently simulated with the method. An excellent agreement is achieved between the simulation results and the monitoring data. Findings An IFEM method is proposed and a non-adiabatic temperature rise test is simulated to verify the method. The interval results are discussed and compared with monitoring data. The proposed method is found to be feasible and effective. Originality/value Compared with the traditional finite element methods, the proposed method taking the uncertainty of various factors into account and it will be helpful for engineers to gain a better understanding of the real condition.

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