Investigation of Thermal Residual Stresses in Co-Cured Aluminum/Composite Hybrid Shaft Using Finite Element Method

2014 ◽  
Vol 703 ◽  
pp. 68-72
Author(s):  
Wen Feng Hao ◽  
Xin Wen Chen ◽  
Li Wei Deng ◽  
Xiang Wang
Keyword(s):  
Residual Stresses ◽  
Cooling Rate ◽  
Hybrid Structure ◽  
Degree Of Cure ◽  
Aluminum Composite ◽  
Fem Model ◽  
Thermal Residual Stresses ◽  
Stress And Deformation ◽  
Residual Stress And Deformation ◽  
Mechanic Property

In this work, thermal residual stresses and deformation of an aluminum/composite hybrid shaft was studied using ABAQUS FEM software. First, the thermo-chemical model of the curing process was described, and the curing parameters were determined. Then, a FEM model of the co-cured aluminum/composite hybrid shaft was build up using ABAQUS FEM software. Finally, the distribution of the thermal residual stress and deformation in the co-cured aluminum/composite hybrid shaft due to curing was obtained, and the effect of cooling rate was analyzed. The results show that residual stresses can be reduced obviously by reasonable cooling rate. The cooling rate also affect the degree of cure which influenced the mechanic property of aluminum/composite hybrid structure directly.

Effect of Dwell Time and Heating Rate on Thermal Residual Stresses in Co-Cured Aluminum/Composite Hybrid Shaft

2015 ◽  
Vol 723 ◽  
pp. 485-488 ◽  
Author(s):  
Wen Feng Hao ◽  
Can Tang
Keyword(s):  
Residual Stresses ◽  
Heating Rate ◽  
Dwell Time ◽  
Hybrid Structure ◽  
Curing Temperature ◽  
Slow Heating ◽  
Aluminum Composite ◽  
Thermal Residual Stresses ◽  
The Difference ◽  
Mechanic Property

In this work, thermal residual stresses and deformation of an aluminum/composite hybrid shaft was studied using ABAQUS FEM software. In order to reduce the thermal residual stresses and deformation produced during co-cure bonding stages due to the difference of coefficients of thermal expansions (CTE) of the composite and the aluminum tube, the curing temperature field was optimized. The effects of dwell time and heating rate were investigated. The results show that residual stresses can be reduced obviously by reasonable dwell time and slow heating rate. The dwell time and heating rate also effect the degree of cure which influenced the mechanic property of aluminum/composite hybrid structure directly.

The Effect of Shot-Peening on Thermal Residual Stress around the Singular Point of Cu-Low Alloy Rail Steel in Welded Joints

2018 ◽  
Vol 876 ◽  
pp. 20-24
Author(s):  
Attaporn Wisessint ◽  
Sastawut Boonrod ◽  
Kanoknart Chaiprasert
Keyword(s):  
Singular Point ◽  
Residual Stresses ◽  
Cooling Rate ◽  
Shot Peening ◽  
Welded Joint ◽  
Rail Steel ◽  
Stress Singularity ◽  
Least Square ◽  
Welding Joint ◽  
Thermal Residual Stresses

A copper wire was welded to low-alloy rail steel by exothermic welding. There were pre-heating and post-heating processes before and after welding, respectively. Unfortunately, the cooling rate of temperature could be controlled in the post-heating process. The cooling rate of temperature was too fast because the ambient temperature was very low (-5 °C). After that, the large value of thermal residual stresses remained in the welding joint and led to failure. In the present study, a welded joint between copper and low-alloy rail steel was analyzed using finite element analysis (FEA). The singularity of thermal residual stresses in the welding joint was observed after post-heating processes. The intensity of stress singularity (Kqq) was estimated around a singular point of the welded joint by least-square method. The possibility of crack initiation was determined. Then, a shot-peening process was applied on the surface of the low-alloy rail steel near the singular point of the welded joint. A small particle of 3 mm diameter was shot to make it plastically deform on the low-alloy rail steel surface. The effect of the shot-peening on the singularity of thermal residual stresses around the singular point of the welding joint was determined and found that the value of singularities for the stress sqq profile were reduced and became steady.

scholarly journals Comparison of Phase Characteristics and Residual Stresses in Ti-6Al-4V Alloy Manufactured by Laser Powder Bed Fusion (L-PBF) and Electron Beam Powder Bed Fusion (EB-PBF) Techniques

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 796
Author(s):  
Aya Takase ◽  
Takuya Ishimoto ◽  
Naotaka Morita ◽  
Naoko Ikeo ◽  
Takayoshi Nakano
Keyword(s):  
Electron Beam ◽  
Residual Stresses ◽  
Cooling Rate ◽  
Process Parameters ◽  
Phase Evolution ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Solidification Temperature ◽  
Powder Bed ◽  
Β Phase

Ti-6Al-4V alloy fabricated by laser powder bed fusion (L-PBF) and electron beam powder bed fusion (EB-PBF) techniques have been studied for applications ranging from medicine to aviation. The fabrication technique is often selected based on the part size and fabrication speed, while less attention is paid to the differences in the physicochemical properties. Especially, the relationship between the evolution of α, α’, and β phases in as-grown parts and the fabrication techniques is unclear. This work systematically and quantitatively investigates how L-PBF and EB-PBF and their process parameters affect the phase evolution of Ti-6Al-4V and residual stresses in the final parts. This is the first report demonstrating the correlations among measured parameters, indicating the lattice strain reduces, and c/a increases, shifting from an α’ to α+β or α structure as the crystallite size of the α or α’ phase increases. The experimental results combined with heat-transfer simulation indicate the cooling rate near the β transus temperature dictates the resulting phase characteristics, whereas the residual stress depends on the cooling rate immediately below the solidification temperature. This study provides new insights into the previously unknown differences in the α, α’, and β phase evolution between L-PBF and EB-PBF and their process parameters.

Numerical Simulation for Residual Stress and Deformation of Surface Welding on Membrane Water-Wall

2014 ◽  
Vol 490-491 ◽  
pp. 594-599
Author(s):  
Fan Ling Meng ◽  
Ai Guo Liu
Keyword(s):  
Residual Stress ◽  
Great Influence ◽  
Residual Deformation ◽  
Welding Residual Stress ◽  
Finite Element Software ◽  
Welding Sequence ◽  
Surface Welding ◽  
Stress And Deformation ◽  
Welding Sequences ◽  
Residual Stress And Deformation

Automatic MIG was adopted to weld Inconel 625 alloy on 20 G Membrane Waterwall, which can improve the capacities of high temperature corrosion resistance and wear resistance. To study the influence of Membrane Waterwall surface welding sequences on residual stress and residual deformation, this paper utilized finite element software ABAQUS and segmented moving heat source model to simulate the sequence welding, balanced welding from the middle to sides, balanced welding from sides to the middle, balanced skip welding from middle to sides and balanced skip welding from sides to the middle and studied their residual stresses and deformations. The simulation results indicated that there was a great influence of welding sequences on the residual stress and deformation. The optimal welding sequence was balanced skip welding from middle to sides and balanced skip welding from sides to the middle, which could change the stress distribution, decrease the welding residual stress by 17%, realize the even deformation of the whole welding section and decrease the bending deformation by 50%.

Sign in / Sign up

Export Citation Format

Share Document