Residual Stress and Deformation After Finishing of a Shell Structure Fabricated by Direct Metal Lamination Using Arc Discharge

2012 ◽  
Vol 6 (5) ◽  
pp. 611-617 ◽  
Author(s):  
Takeyuki Abe ◽  
◽  
Hiroyuki Sasahara
Keyword(s):  
Residual Stress ◽  
Temperature Distribution ◽  
Shell Structure ◽  
Arc Discharge ◽  
Three Dimensional ◽  
Local Maximum ◽  
Stress Release ◽  
Stress And Deformation ◽  
Metallic Parts ◽  
The Relationship

Arc welding technology has been used to melt metal, and a fabrication system for three-dimensional metallic parts has been developed around it: direct metal lamination using arc discharge. Here, the relationship between residual stress in the shell structure and temperature distribution in the shell structure after lamination are explored. Deformation caused by residual stress release is also measured. The results clarify that the local maximum value of the residual stress is small when the temperature in the shell structure is high. It is also found that the temperature distribution can be controlled through heat-input conditions and a cooling method using water. The residual stress distribution is formed by a non-uniform compressive plastic strain distribution. Plastic deformation is caused by the temperature distribution. No significant deformation due to residual stress release is observed when the lateral surface is finished.

Three-Dimensional Numerical Simulation of Residual Stresses by Shot-Peening

2009 ◽  
Vol 79-82 ◽  
pp. 1189-1192
Author(s):  
Hong Wei Zhang ◽  
Yi Du Zhang ◽  
Qiong Wu
Keyword(s):  
Residual Stress ◽  
Shot Peening ◽  
Incident Angle ◽  
Three Dimensional ◽  
Single Shot ◽  
Residual Stress Field ◽  
Sensitive Material ◽  
Explicit Analysis ◽  
History Of ◽  
Metallic Parts

Shot peening is a complex cold working process used to improve the fatigue life of metallic parts. This investigation is devoted to the modeling and simulation of the residual stress field resulting from the shot peening process, in which the finite element method was employed using a rate sensitive material. The history of energies during explicit dynamic analysis was discussed and the solution time for explicit analysis was analyzed. For the single shot impact model, the effect of shot velocity, shot size, incident angle was studied. In addition, the effect of repeated impacts on the residual stress within the target plate was studied. Furthermore, the multiple shot impacts of shot peening process were accomplished and the effect of peening coverage was investigated based on different shot models.

scholarly journals Numerical Analysis of Curing Residual Stress and Deformation in Thermosetting Composite Laminates with Comparison between Different Constitutive Models

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 572 ◽  
Author(s):  
Jianfeng Dai ◽  
Shangbin Xi ◽  
Dongna Li
Keyword(s):  
Residual Stress ◽  
Composite Laminates ◽  
Viscoelastic Model ◽  
Three Dimensional ◽  
Constitutive Models ◽  
Curing Process ◽  
Linear Elastic ◽  
Stress And Deformation ◽  
Thermosetting Composite ◽  
Residual Stress And Deformation

A multi-physics coupling numerical model of the curing process is proposed for the thermosetting resin composites in this paper, and the modified “cure hardening instantaneously linear elastic (CHILE)” model and viscoelastic model are adopted to forecast residual stress and deformation during the curing process. The thermophysical properties of both models are evolved in line with temperature and degree of cure (DOC). Accordingly, the numerical simulation results are improved to be more accurate. Additionally, the elastic modulus of the materials is calibrated to be equal to the modulus of viscoelastic relaxation by a defined function of time in the CHILE model. Subsequently, this work effectuates the two proposed models in a three-dimensional composite laminate structure. Through comparing the two numerical outcomes, it is customary that the residual stress and deformation acquired by the modified model of CHILE conform to those ones assessed through adopting the viscoelastic model.

Prediction of Temperature Distribution and Residual Stress in SLM Printed Parts

2018 ◽  
Author(s):  
Hong-Seok Park ◽  
Ngoc-Hien Tran ◽  
Ansari Md Jonaet
Keyword(s):  
Residual Stress ◽  
Temperature Distribution ◽  
Laser Source ◽  
Powder Bed ◽  
Manufacturing Planning ◽  
System A ◽  
Physical Chemical ◽  
Fast Cooling ◽  
Metallic Parts

Selective laser melting (SLM) is a powder bed based additive manufacturing (AM) process to manufacture metallic parts. SLM is the complex thermal-physical-chemical process of the interaction between a laser source and metallic powders. The SLM printing method has been applied widely for fabricating the metallic parts. However, the high temperature in heating and fast cooling during SLM process result in the large residual stress which affects to the quality of the SLM printed parts such as distortion and cracks. This research proposes to develop a system for predicting the quality of the part from the manufacturing planning to remove the failures before carrying out the real printing process. For developing such system, a model for predicting the temperature distribution should be generated. From this model, an interrelationship between process parameters and temperature distribution should be derived out. Based on that, the deformation can be predicted by calculating residual stress along with the result of temperature distribution.

Analysis of the Residual Stress and Deformation in a Steel Tube due to Quenching Process Using Different Media

2014 ◽  
Author(s):  
Pratik Sarker ◽  
Uttam K. Chakravarty
Keyword(s):  
Residual Stress ◽  
Temperature Drop ◽  
Three Dimensional ◽  
Interaction Model ◽  
Steel Tube ◽  
Time Varying ◽  
Steel Tubes ◽  
Rapid Temperature ◽  
Stress And Deformation ◽  
Residual Stress And Deformation

Steel tubes are widely used in industries as machine components and are most common in heavily loaded mechanisms subjected to high dynamic torsional and compressive stress. Hence, they should have higher strength than that of the conventional mechanisms to resist failure. Quenching, an industrial heat treatment process, can improve the microstructure, hardness, toughness, and corrosion and wear resistance of materials. Steel tubes, if quenched, would have desired properties to serve the purposes. However, besides improving material properties, quenching generates some residual stress and deformation in the material due to rapid temperature drop and phase transformation. Therefore, to estimate the temperature distribution, residual stress, and deformation computationally; a three-dimensional fluid-structure interaction model is developed for the steel tube with different quenchants. The quenching characteristics by water, brine, and propylene glycol are estimated and compared with each other. The time-varying nodal temperature distributions in the tube are observed and the critical regions are identified having maximum residual stress and deformation. The time-varying residual stress and deformation at a particular point and along the axial and radial directions of the tube are studied. The convergence of the model is checked and validation of the model is done.

Numerical Simulation of Residual Stress and Deformation of Special Resistance Welding of Nuclear Power Zirconium Tube

2010 ◽  
Vol 154-155 ◽  
pp. 304-309
Author(s):  
Zu Wei Lin ◽  
Fang Quan Chen ◽  
Guo Wei Liang
Keyword(s):  
Residual Stress ◽  
Nuclear Power ◽  
Three Dimensional ◽  
Welding Residual Stress ◽  
Resistance Welding ◽  
Analysis Model ◽  
Element Analysis ◽  
Related Stress ◽  
Stress And Deformation ◽  
Residual Stress And Deformation

According to the actual situation of special resistance welding capp of nuclear power zirconium tubes, using nonlinear finite element analysis technology to establish an three-dimensional numerical analysis model. Analysising the distribution rules of welding residual stress and deformation. Simulation results can be explained a number of welding-related stress problems and also provide a favorable reference for optimizing the welding capp method and implementation of capp processes.

Boundary Condition Design to Heat a Moving Object at Uniform Transient Temperature Using Inverse Formulation

2004 ◽  
Vol 126 (3) ◽  
pp. 619-626 ◽  
Author(s):  
Hakan Ertu¨rk ◽  
Ofodike A. Ezekoye ◽  
John R. Howell
Keyword(s):  
Boundary Condition ◽  
Temperature Distribution ◽  
Design Problem ◽  
Manufacturing Industry ◽  
Three Dimensional ◽  
Chemical Deposition ◽  
Iterative Solution ◽  
Conveyor Belt ◽  
Temperature History ◽  
Transient Temperature

The boundary condition design of a three-dimensional furnace that heats an object moving along a conveyor belt of an assembly line is considered. A furnace of this type can be used by the manufacturing industry for applications such as industrial baking, curing of paint, annealing or manufacturing through chemical deposition. The object that is to be heated moves along the furnace as it is heated following a specified temperature history. The spatial temperature distribution on the object is kept isothermal through the whole process. The temperature distribution of the heaters of the furnace should be changed as the object moves so that the specified temperature history can be satisfied. The design problem is transient where a series of inverse problems are solved. The process furnace considered is in the shape of a rectangular tunnel where the heaters are located on the top and the design object moves along the bottom. The inverse design approach is used for the solution, which is advantageous over a traditional trial-and-error solution where an iterative solution is required for every position as the object moves. The inverse formulation of the design problem is ill-posed and involves a set of Fredholm equations of the first kind. The use of advanced solvers that are able to regularize the resulting system is essential. These include the conjugate gradient method, the truncated singular value decomposition or Tikhonov regularization, rather than an ordinary solver, like Gauss-Seidel or Gauss elimination.

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