Failure Analysis of Coil Racks in a Batch Annealing Furnace Using Finite Element Methods

2020 ◽  
Author(s):  
Nicholas J. Walla ◽  
Hua You ◽  
Xinyu Zhu ◽  
Chenn Q. Zhou ◽  
Matthew Liddick
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Severe Stress ◽  
Annealing Furnace ◽  
Simulation Data ◽  
Lifting Force ◽  
Batch Annealing ◽  
Steel Coils ◽  
Loading And Unloading ◽  
Uneven Heating

Abstract In this work, a series of finite element method simulations were performed on cooling racks used for the loading and unloading of steel coils in a batch annealing furnace. Normal furnace operations were simulated using ANSYS Thermal FEA and ANSYS Mechanical FEA to reproduce the thermal and structural loads experienced by the racks, as well as additional lifting forces representing removal by forklift after annealing. In addition to warping found due to uneven heating from the radiative elements of the furnace, severe stress leading to failure was identified on the base of the racks from the lifting force. These results correspond with failures seen in the actual units. The simulation data was used for design adjustments to reduce the damage from the above sources.

Failure Analysis of Coil Racks in a Batch Annealing Furnace Using Finite Element Methods

2021 ◽  
Author(s):  
Hua You ◽  
Xinyu Zhu ◽  
Nicholas Walla ◽  
Matthew Liddick ◽  
Chenn Zhou
Keyword(s):  
Finite Element ◽  
Failure Analysis ◽  
Finite Element Methods ◽  
Annealing Furnace ◽  
Batch Annealing

Numeric Loading Simulation of Titanium Implant Manufactured Using 3D Printing

2018 ◽  
Vol 284 ◽  
pp. 380-385 ◽  
Author(s):  
Anton I. Golodnov ◽  
Yu.N. Loginov ◽  
Stepan I. Stepanov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Titanium Alloy ◽  
Elastic Modulus ◽  
Titanium Implant ◽  
Finite Element Method Simulation ◽  
Medical Implants ◽  
The Finite Element Method ◽  
Simulation Data

The problem of medical implants honeycomb structures loading has been stated. The problem was solved using simulation by the finite element method. Simulation revealed that it is possible to change the elastic modulus of the material more than three times with respect to the bulk titanium alloy. The quality of the simulation was estimated based on the convergence of the simulation data.

Unloading of an Elastic-Plastic Loaded Spherical Contact

2004 ◽  
Author(s):  
Yuri Kligerman ◽  
Izhak Etsion ◽  
Yuri Kadin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Simulations ◽  
The Finite Element Method ◽  
Linear Hardening ◽  
Elastic Plastic ◽  
Contact Loads ◽  
Wide Range ◽  
Residual Curvature ◽  
Loading And Unloading

The process of unloading an elastic-plastic loaded sphere in contact with a rigid flat is studied by the Finite Element Method. The sphere material is assumed isotropic with elastic-linear hardening. The numerical simulations cover a wide range of loading interference deformation of various values of Young’s modulus and Poisson ratios of the sphere material. The contact loads, stresses, and deformations in the sphere during both loading and unloading, are calculated for the range of interferences. Empirical dimensionless expressions are presented for the unloading load-deformation relation, the residual axial displacement and the residual curvature of the sphere after complete unloading.

scholarly journals The study of the lifting mechanism of the crane arm to a barge

2020 ◽  
Vol 2 (1) ◽  
pp. 91-96
Author(s):  
C. Fratila ◽  
T. Axinte ◽  
R. C. Cojocaru ◽  
C. Berescu ◽  
I.C. Scurtu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Life ◽  
Finite Elements ◽  
Safety Factor ◽  
The Finite Element Method ◽  
Ship Owner ◽  
Loading And Unloading ◽  
Lifting Equipment ◽  
Boom Crane

During cargo loading and unloading, the vessels’ lifting gear, even if anchored or moored, is affected by the pitch and roll movements, in addition to the usual stresses, a similar shore crane is subjected to. This paper aims at presenting an analysis of the lifting operations of a boom crane pertaining to a self-propelled barge. The analysis starts with the meshing with triangle elements, the stresses and the embedding using the finite elements method. The crane and the pertaining boom were modeled using CAD design, NX 10.0 from Siemens. The lifting equipment of the ships boom crane may be subject to dangerous defects occurring during the loading and unloading process. Subsequently, the research emphasizes the stresses occurred in the piston rod and in the eye of the lifting equipment, using the finite element method (FEM). After the stress analysis, several fatigue matters are studied: fatigue safety factor, fatigue life, strength safety factor and crack. The damaging or breaking of the eye or of the piston rod from the lifting equipment of the ships boom crane is leading to the blocking of the cylinder with the result of unfavorable events, such as deformation of the boom crane, damaging the loads and even the danger of sinking the barge. The results of this analysis provide ship-owner and maintenance engineers a useful tool to take appropriate decision during inspection of the lifting gear of the ship, prior commencement of the loading and unloading operations.

Contact Behaviors of Coated Asperity with Power-Law Hardening Elastic–Plastic Substrate During Loading and Unloading Process

2018 ◽  
Vol 10 (03) ◽  
pp. 1850034 ◽  
Author(s):  
Xiqun Lu ◽  
Fuzhan Huang ◽  
Bin Zhao ◽  
Leon M. Keer
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Power Law ◽  
Coating Thickness ◽  
Rapid Decrease ◽  
Plastic Substrate ◽  
The Finite Element Method ◽  
Elastic Plastic ◽  
Loading And Unloading

The behavior of a coated asperity contacting with a rigid flat during the loading and unloading processes is investigated using the finite element method. The power-law hardening elastic–plastic substrate is considered, and the effect of the substrate hardening exponent and the coating thickness on the contact behavior is studied. It is shown that in the loading process, the contact load increases more slow and the contact area increases faster as the interference increases for smaller coating thickness and hardening exponent cases, and the coating thickness recovers more obviously after a rapid decrease. In the unloading process, the residual interference and the pileup effect of the asperity surface is larger for smaller coating thicknesses and hardening exponents, and the energy loss due to the plastic deformation is larger accordingly.

scholarly journals The Solution of the Thermal Elastic-Plastic Problem of Turbine Disk by the Incremental Finite Element Method

1985 ◽  
Author(s):  
Sun Jin-Wen ◽  
Ouyang Chang ◽  
Fang Jing-Yan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Load Capacity ◽  
Limit Load ◽  
Turbine Disk ◽  
Fracture Characteristics ◽  
Elastic Plastic ◽  
Loading And Unloading ◽  
Plastic Stage ◽  
Element Method

In this paper, a stress analysis method and a computation program of the solution for the thermal elastic-plastic problem of turbine disk in an aeroengine are presented by incremental finite element method. That method (It is suitable to the axisymmetric disk in the gasturbine, compressor, steam turbine as well) may be used to compute the stress and displacement of turbine disk at its thermal elastic or thermal elastic-plastic stage, its cracking revolving speed and limit load capacity and what part of that enters into the plastic zone first. The method may be used to compute its loading and unloading process, its residual stress and displacement as well. It is important to analyse the strength of the turbine disk and its fracture characteristics.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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