A finite element model for simulating second generation high temperature superconducting coils/stacks with large number of turns

2017 ◽  
Vol 122 (4) ◽  
pp. 043903 ◽  
Author(s):  
Fei Liang ◽  
Sriharsha Venuturumilli ◽  
Huiming Zhang ◽  
Min Zhang ◽  
Jozef Kvitkovic ◽  
...  
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Finite Element Model ◽  
Second Generation ◽  
Element Model ◽  
High Temperature Superconducting ◽  
Superconducting Coils

Proposal of a new low-cycle fatigue life model for cast iron with room temperature calibration involving mean stress and high-temperature effects

2019 ◽  
Vol 233 (14) ◽  
pp. 5056-5073 ◽  
Author(s):  
Cristiana Delprete ◽  
Raffaella Sesana
Keyword(s):  
Finite Element ◽  
Cast Iron ◽  
High Temperature ◽  
Finite Element Model ◽  
Life Prediction ◽  
Low Cycle Fatigue ◽  
Element Model ◽  
Mean Stress ◽  
Exhaust Manifold ◽  
Cycle Fatigue

The paper presents and discusses a low-cycle fatigue life prediction energy-based model. The model was applied to a commercial cast iron automotive exhaust manifold. The total expended energy until fracture proposed by the Skelton model was modified by means of two coefficients which take into account of the effects of mean stress and/or mean strain, and the presence of high temperature. The model was calibrated by means of experimental tests developed on Fe–2.4C–4.6Si–0.7Mo–1.2Cr high-temperature-resistant ductile cast iron. The thermostructural transient analysis was developed on a finite element model built to overtake confidentiality industrial restrictions. In addition to the commercial exhaust manifold, the finite element model considers the bolts, the gasket, and a cylinder head simulacrum to consider the corresponding thermal and mechanical boundary conditions. The life assessment performance of the energy-based model with respect the cast iron specimens was compared with the corresponding Basquin–Manson–Coffin and Skelton models. The model prediction fits the experimental data with a good agreement, which is comparable with both the literature models and it shows a better fitting at high temperature. The life estimations computed with respect the exhaust manifold finite element model were compared with different multiaxial literature life models and literature data to evaluate the life prediction capability of the proposed energy-based model.

Numerical Simulation of Steel Grid Structure under High Temperature

2013 ◽  
Vol 838-841 ◽  
pp. 458-461
Author(s):  
Jing Cui ◽  
Ling Feng Yin ◽  
Xiao Ming Guo ◽  
Gan Tang ◽  
Tian Jiao Jin
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
High Temperature ◽  
Finite Element Model ◽  
Numerical Method ◽  
Nonlinear Interaction ◽  
Element Model ◽  
Fire Tests ◽  
Grid Structure ◽  
Test Models

Based on the fire tests of WILLIAMS double-poles structure, considering the dual nonlinear interaction of material and geometric, established one complete finite element model of grid structure. For the performance that the physical and mechanics properties of steel will degrade while the temperature arising, simulate the test models with ANSYS, get a better numerical results, proof the numerical method is feasible.

Fire performance of concrete sandwich panel under axial load

2020 ◽  
Vol 15 (1) ◽  
pp. 45-52 ◽  
Author(s):  
Behnam Sajadian ◽  
Hamidreza Ashrafi
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Finite Element Model ◽  
High Temperatures ◽  
Axial Load ◽  
Sandwich Panel ◽  
Element Model ◽  
Fire Performance ◽  
Maximum Displacement ◽  
Sandwich Wall

Abstract In the present study, the performance of concrete sandwich panel against fire and axial load has been considered. A finite element model of a sandwich wall is presented and evaluated the performance under different temperature (200, 400, 600 °C. The ratio of width, thickness and length of wall are constant and the axial load enters on the top of wall. The maximum displacement and stress in different models shows the capacity of wall is increased at high temperature. The displacement has dramatically increased at temperature loading of 800 °C and it has gained which shows poor efficiency of wall at high temperatures.

scholarly journals Study on Quenching Characteristics and Resistance Equivalent Estimation Method of Second-Generation High Temperature Superconducting Tape under Different Overcurrent

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2374 ◽  
Author(s):  
Liang ◽  
Ren ◽  
Ma ◽  
Xu ◽  
Tang ◽  
...  
Keyword(s):  
High Temperature ◽  
Normal State ◽  
Second Generation ◽  
Estimation Method ◽  
Element Model ◽  
Experimental Results ◽  
Superconducting Tape ◽  
High Temperature Superconducting ◽  
Equivalent Method ◽  
The Relationship

In this paper, through AC and DC overcurrent tests on second generation high temperature superconducting tape (2G HTS tape), we respectively summarize the typical types of quenching resistance and corresponding quenching degree, in which there are three types under AC overcurrent and two types under DC overcurrent. According to experimental results, a rule was found that, when 2G HTS tape quenches to normal state, the relationship between quenching resistance and joule heat generated from 2G HTS tape presents a fixed trend line, and the influence of liquid nitrogen can be ignored. Then, the characteristics and rules of quenching resistance found in experiments are well explained and confirmed by a detailed 3D finite element model of 2G HTS tape including electromagnetic field and thermal field. Finally, based on above works, our group proposes a new equivalent method to estimate the quenching resistance, where the results of AC and DC overcurrent experiments can be equivalent to each other within a certain range. Compared with FEM, the method has the following advantages: (i) The method is simple and easy to implement. (ii) This method combines precision and computational efficiency. (iii) With superconducting tape quenching to normal state, this method presents a good consistency with experimental results.

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