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.

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.

scholarly journals Experimental Consideration of Conditions for Measuring Residual Stresses of Rails Using Magnetic Barkhausen Noise Method

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5374
Author(s):  
Young-In Hwang ◽  
Yong-Il Kim ◽  
Dae-Cheol Seo ◽  
Mu-Kyung Seo ◽  
Woo-Sang Lee ◽  
...  
Keyword(s):  
Residual Stresses ◽  
High Speed ◽  
Barkhausen Noise ◽  
Noise Band ◽  
Magnetic Barkhausen Noise ◽  
Continuous Increase ◽  
Fracture Characteristics ◽  
Fatigue And Fracture ◽  
The Difference ◽  
Number Of Passes

Residual stress, a factor affecting the fatigue and fracture characteristics of rails, is formed during the processes of fabrication and heat treatment, and is also generated by vertical loads on wheels due to the weight of vehicles. Moreover, damage to rails tends to accelerate due to the continuous increase in the number of passes and to the high speed of passing vehicles. Because this can have a direct effect on safety accidents, having a technique to evaluate and analyze the residual stresses in rails accurately is very important. In this study, stresses due to tensile loads applied to new rails and residual stresses remaining in used rails were measured by using magnetic Barkhausen noise method. First, a magnetization frequency and noise band suitable for the rails were selected. Moreover, by applying tensile loads to specimens and comparing the difference in magnetization amplitudes for each load, the stresses applied to the rails by using the magnetic Barkhausen noise method were measured, and the analysis of the results was verified. Based on these results, the difference in the results for the loads asymmetrically applied according to the wheel shape was analyzed by measuring for the head parts of used rails.

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