Calculations for stress-strained state of a panel of a solar array under thermal loading conditions

2005 ◽  
Vol 11 (5-6) ◽  
pp. 103-110 ◽  
Author(s):  
Wang Xiaoyan ◽  
◽  
Yu.A. Pokhyl ◽  
K.V. Koval ◽  
H. Shiyu ◽  
...  
Keyword(s):  
Thermal Loading ◽  
Solar Array ◽  
Strained State ◽  
Loading Conditions

Fracture mechanics assessment of divertor vertical target under thermal loading conditions

2019 ◽  
Vol 146 ◽  
pp. 2209-2213 ◽  
Author(s):  
Jae Min Sim ◽  
Sang Yun Je ◽  
Ji-Hoon Kang ◽  
Yoon-Suk Chang
Keyword(s):  
Fracture Mechanics ◽  
Thermal Loading ◽  
Loading Conditions

Numerical Investigations of Phenomena Caused by the Closure and Growth Behavior of Short Cracks Under Thermal Cyclic Loading

2010 ◽  
Author(s):  
Ju¨rgen Rudolph ◽  
Kai Bauerbach ◽  
Michael Vormwald
Keyword(s):  
Cyclic Loading ◽  
Crack Propagation ◽  
Crack Closure ◽  
Thermal Loading ◽  
Hysteresis Loops ◽  
Local Stress ◽  
Damage Parameter ◽  
Loading Conditions ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

Thermal cyclic loading conditions of nuclear power plant components cause local stress-strain hystereses which are considered to be fatigue relevant events. The contributions of the hysteresis-loops to the fatigue process are evaluated using a damage parameter based on the effective cyclic J-integral which also includes the effects of crack closure. The successful application of such a short crack propagation approach essentially depends on the realistic description of the crack closure. In this context a finite element based algorithm is presented to simulate the opening and closure effects under special consideration of thermal cyclic loading conditions. The concept is based on node release and contact mechanisms. The implications of the crack propagation on the temperature at the crack tip are to be considered. In this context, the consequences of the altered temperature profile as the crack propagates have to be taken into account. It is the aim to formulate Newman-type analytical equations in order to incorporate the influence of crack closure into an engineering approach. Furthermore, the peculiarities of transient thermal loading on the crack propagation behavior are considered. The reduced crack propagation rates due to the temperature gradient in the direction of the wall are investigated numerically in order to describe the reduction of the damage contribution and decelerated crack propagation rates. The effects of changing thermal conditions in the wall on the crack propagation behavior are considered within the numerical algorithm.

Fatigue Assessment of Nuclear Power Plant Components Subjected to Thermal Cyclic Loading

2009 ◽  
Author(s):  
Kai Bauerbach ◽  
Michael Vormwald ◽  
Ju¨rgen Rudolph
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Thermal Loading ◽  
Hysteresis Loops ◽  
Plastic Behavior ◽  
Loading Conditions ◽  
Material Parameters ◽  
Structural Loading ◽  
Plant Components

Thermal loading conditions of nuclear power plant components cause local stress-strain hystereses. For the fatigue life prediction of nuclear power plant components under thermal cyclic and structural loading a new method based on the local strain approach is to be presented. This method involves finite-element simulations as well as the experience gathered from lifetime assessment methods based on short crack models. The local stresses and strains are obtained from coupled-field FE-analyses. The calculation of the hysteresis-loops relies on appropriate material models and experimentally verified temperature-dependent material parameters in order to describe the elasto-plastic behavior of the material as realistically as necessary. Due to the temperature dependence of the material parameters the resulting hysteresis loops are of non-conventional shapes and similar to those observed under multiaxial nonproportional structural loading. Hence, fatigue methodologies developed for non-proportional loading conditions during the past years bear good prospects for successful application under non-isothermal loading conditions.

In-pile testing of ITER first wall mock-ups at relevant thermal loading conditions in the LVR-15 nuclear research reactor

2015 ◽  
Vol 98-99 ◽  
pp. 1271-1275 ◽  
Author(s):  
Jan Kysela ◽  
Slavomir Entler ◽  
Rudolf Vsolak ◽  
Tomas Klabik ◽  
Ondrej Zlamal ◽  
...  
Keyword(s):  
Thermal Loading ◽  
Research Reactor ◽  
Nuclear Research ◽  
Loading Conditions ◽  
First Wall ◽  
Nuclear Research Reactor ◽  
Pile Testing

scholarly journals Numerical Simulation of Interaction between Hall Thruster CEX Ions and SMART-1 Spacecraft

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Kang Shan ◽  
Yuchuan Chu ◽  
Qingyu Li ◽  
Liang Zheng ◽  
Yong Cao
Keyword(s):  
Numerical Simulation ◽  
Heat Flux ◽  
Thermal Loading ◽  
Three Dimensional ◽  
Hall Thruster ◽  
Solar Array ◽  
Thermal Heating ◽  
Main Thrust ◽  
Solar Arrays ◽  
Simulation Results

The interaction between the plume of Hall thruster and the surface of the SMART-1 spacecraft is investigated by developing a three-dimensional IFE-PIC-MCC code, with the emphasis on the effect of the disturbance force and thermal loading caused by charge exchange ions (CEX) impingement on the surface of the spacecraft. The parameters such as heat flux and forces of CEX ions which impinge on SMART-1 and solar arrays are obtained. The disturbance force of CEX ions to the spacecraft is calculated for different divergence angles and different solar array rotation cases. The simulation results show that the disturbance force and heat flux on spacecraft change very little as the divergence angle changes. The effect of maximum disturbance force can be neglected since it is so small comparing with the nominal value of the main thrust. Solar arrays receive the least thermal heating from the CEX ions when the beam ions flow is perpendicular to the solar array plane.

scholarly journals A Probabilistic Conductor Size Selection Framework for Active Distribution Networks

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6387
Author(s):  
Lewis Waswa ◽  
Munyaradzi Justice Chihota ◽  
Bernard Bekker
Keyword(s):  
Thermal Loading ◽  
Planning Process ◽  
Low Voltage ◽  
Optimization Problems ◽  
Uncertainty Modeling ◽  
Distribution Networks ◽  
Loading Conditions ◽  
Size Selection ◽  
Selection Framework ◽  
Design Case Study

With the increasing adoption of distributed energy resources (DERs) such as wind and solar photovoltaics (PV), many distribution networks have changed from passive to active. In turn, this has led to increased technical and operational challenges such as voltage issues and thermal loading in high DER penetration scenarios. These challenges have been further increased by the uncertainties arising from DER allocation. The implication of DER allocation uncertainty in the planning process is far-reaching as it affects critical planning processes, including conductor size selection (CSS). Most reported CSS methods in the literature do not include DER allocation uncertainty modeling as they are mostly deterministic and are set out as optimization problems. The methods, therefore, lack foresight on future loading conditions and cannot be used in a CSS process for feeders with high DER penetration. This paper proposes a novel input–process–output stochastic–probabilistic CSS framework for distribution feeders with DERs. The efficacy of the proposed framework is demonstrated using a low voltage feeder design case study with varying PV penetration targets, and the performance compared to deterministic–active-based estimates from our earlier work. The proposed CSS method is well-suited to the sizing of conductors for future loading conditions considering DER allocation uncertainty and will therefore be useful to planners working on new electrification projects.

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