Tangential Modulus Equation of the Steel Axial Member with I-section Considering the Pattern and the Maximum Value of the Residual Stress

2011 ◽  
Vol 11 (5) ◽  
pp. 121-131
Author(s):  
Kyung-Suk Lee ◽  
Seung-Jun Kim ◽  
Jin-Hee Choi ◽  
Young-Jong Kang
Keyword(s):  
Residual Stress ◽  
Maximum Value ◽  
Tangential Modulus

Laser Shock Processing of Titanium Alloy Blade and FEM Simulation

2013 ◽  
Vol 456 ◽  
pp. 125-128
Author(s):  
Bing Yan ◽  
Rui Wang
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Residual Stresses ◽  
Fem Simulation ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Tc4 Titanium Alloy ◽  
Compressive Stresses ◽  
Maximum Value ◽  
Shock Processing

The aim of this article is to analyze the residual stresses field in a TC4 titanium alloy blade by laser shock processing (LSP).LSP is a new surface processing technology, it uses the laser shock wave to act on the surface of the target and form residual compressive stresses field. The ABAQUS software is applied to simulate the LSP of TC4 titanium alloy blade, and the distributions of the residual stresses field are analysed.After single LSP,the maximum value of residual stress on the surface is 309 MPa.The residual stresses on the surface increase first and then decrease.The residual stresses at the depth continue decreasing with the increase of the depth.After multiple LSP,the maximum value of residual stress on the surface is increased and plastically affected depth is increased.

Effect of Grit-Blasting on Residual Stress Field

2014 ◽  
Vol 606 ◽  
pp. 91-94
Author(s):  
Ondřej Kovářík ◽  
Petr Haušild ◽  
Zdenek Pala ◽  
Pavel Sachr ◽  
Vadim Davydov
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Stress Field ◽  
Mild Steel ◽  
Sample Surface ◽  
Electron Back Scatter Diffraction ◽  
Residual Stress Field ◽  
Grit Blasting ◽  
Maximum Value ◽  
Cold Rolled

The effect of grit-blasting on the development of residual stress field during the surface treatment of the cold rolled mild steel was characterized by means of neutron diffraction, nanohardness measurement and electron back-scatter diffraction. The neutron diffraction revealed strong residual compressive stress with the maximum value (about-100 MPa) situated just under the sample surface of the grit-blasted sample. The deformation profiles obtained by the nanoindentation and electron back-scatter diffraction (band slope signal) revealed the strain hardening after grit blasting up to depth of approximately 100 μm.

Research on the Residual Stress of Aluminum Alloy (LF6) Welding

2013 ◽  
Vol 546 ◽  
pp. 127-131
Author(s):  
Zhi Qing Guo ◽  
Qiu Juan Lv ◽  
Yan Jiao Li ◽  
Chang Jiang Liu ◽  
Fang Xie
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Experimental Study ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Residual Stress Distribution ◽  
Welding Residual Stress ◽  
Welding Seam ◽  
Maximum Value

This paper use the software ANSYS to study the aluminum alloy (LF6) welding residual stress by numerical simulation and experimental study. The result indicates that the aluminum alloy (LF6) has the same residual stress distribution with others, there is a maximum value existing at the range of 4-5mm near the welding seam.

FEM Simulation Study on Relationship of Interfacial Morphology and Residual Stress in TBCs

2005 ◽  
Vol 475-479 ◽  
pp. 3993-3996 ◽  
Author(s):  
Li Qiang Chen ◽  
Sheng Kai Gong ◽  
Hui Bin Xu
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Bond Coat ◽  
Thermal Cycle ◽  
Fem Simulation ◽  
Residual Stress Distribution ◽  
Maximum Value ◽  
Maximum Residual Stress ◽  
Simulation Results ◽  
Relationship Of

It is generally believed that the failure of TBCs is attributed to the spallation occurred in the ceramic coat. The spallation is closed linked with sinuate morphology factors, including its amplitude and period, at the TGO/bond coat interface. In this work, dependence of the residual stress distribution on the sinuate morphology in the TBCs has been studied by means of Finite Element Method (FEM) simulation for isothermally annealed specimens. The simulation results indicated that the maximum value of residual stress existed inside the TGO layer. It was also found that the maximum residual stress occurred at different points, near the TGO/bond coat interface at the peak of the sinuate interface, while near the TGO/ceramic coat interface at the valley, respectively. And the maximum residual stress increased with increasing the ratio of the amplitude to period in the sine morphology, which has been proved by the thermal cycle experimental results.

X-Ray Measurement of Residual Stress Distribution in Sputtered Cu Thin Films

2012 ◽  
Vol 706-709 ◽  
pp. 1649-1654 ◽  
Author(s):  
Yoshiaki Akiniwa ◽  
Taku Sakaue
Keyword(s):  
Thin Films ◽  
Residual Stress ◽  
Grain Size ◽  
Stress Distribution ◽  
Residual Stress Distribution ◽  
The Other ◽  
X Ray ◽  
Maximum Value ◽  
Other Hand ◽  
Target Power

Three kinds of copper thin films were fabricated by RF-magnetron sputtering. The target power was selected to be 10 and 150 W to change the properties of the films. Thin glass sheet was used as a substrate. For the target power of 150 W, the deposition time was selected to be 7 and 40 min. The thickness was 0.6 μm and 2.9 μm, and the grain size measured was 243 nm and 450 nm, respectively. The grain size of thicker film was larger than that of thinner one. On the other hand, for the target power of 10 W, the thickness and grain size were 2.4 μm and 54 nm, respectively. The grain size depends on the target power. The residual stress distribution in the films was measured by X-ray method. Several methods such as the grazing incidence X-ray diffraction method, the constant penetration depth method and the conventional sin2ψ method were adopted. The measured weighted average stress increased with increasing depth. After taking the maximum value at about 0.3 μm from the surface, the value decreased with increasing depth. The stress distribution near the surface in the films deposited at 150 W was almost identical irrespective of thickness. On the other hand, for the target power of 10 W, the stress distribution shifted to compression side. The reason could be explained by the effect of the thermal residual stress. The real stress distribution was estimated by using the optimization technique. The stress took the maximum value at 0.5 μm from the surface, and was compressive near the substrate. .

Measurement of Internal Residual Stress of the Laser Rapid Forming Parts by Incremental-Step Hole Drilling Method

2013 ◽  
Vol 365-366 ◽  
pp. 1011-1016
Author(s):  
You Bin Lai ◽  
Wei Jun Liu ◽  
Yu Hui Zhao ◽  
Fu Yu Wang ◽  
Wen Chao Han
Keyword(s):  
Residual Stress ◽  
Stress Measurement ◽  
Residual Stress Measurement ◽  
Hole Drilling ◽  
Hole Drilling Method ◽  
Maximum Value ◽  
Calibration Sample ◽  
Drilling Method ◽  
Incremental Step ◽  
Laser Rapid Forming

In order to study the residual stress distribution in the titanium alloy laser rapid forming parts, the incremental-step hole drilling method is improved. Choose a calibration sample which has the same material as the test sample to conduct internal residual stress measurement by incremental-step hole drilling method. Conduct stress-release heat treatment (insulation 4 hours in 750 centigrade, furnace cooling) to the calibration sample before the measurement to uniform the internal stress. Calculate calibration compensation coefficient according to the calibration sample stress measurement result, and use the compensation coefficient to compensate the stress measurement result of the laser rapid forming sample. This method improves the reliability of internal residual stress measurement by incremental-step hole drilling method. Then use this method to measure the stress of laser rapid forming sample. The result shows that both the residual stress in the X direction and the Y direction is larger when the depth ranges from 1 mm to 3 mm. When the depth is greater than 3 mm, the residual stress decreases gradually with the hole depth increasing. The maximum value in the X direction is 147.13 MPa, and the maximum value in the Y direction is 236.32 MPa.

scholarly journals Effects of ultrasonic surface rolling process on tribological behavior of 4Cr13 stainless steel

2022 ◽  
Author(s):  
Xiaoshuang Luo ◽  
Shengpeng Zhan ◽  
Dan Jia ◽  
Jiesong Tu ◽  
Yinhua Li ◽  
...  
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Stainless Steel ◽  
Sample Surface ◽  
Rolling Process ◽  
Near Surface ◽  
Maximum Value ◽  
Sample Height ◽  
Suitable Treatment ◽  
Strengthening Technique

Abstract Ultrasonic surface rolling (USR) process is a novel surface strengthening technique based on the tool head's high-frequency impact on the workpiece. USR can cause severe plastic deformation on the superficial surface of metal material, and greatly improving the mechanical properties of the material. This paper elucidates the effects of USR passes on the surface roughness, sample height, microstructure, microhardness, residual stress, and tribological properties of 4Cr13 stainless steel. The results revealed that multiple USR treatments refined the near-surface layer grain of the sample. Compared with untreated sample, USR treatments significantly improved the surface roughness and microhardness of the samples. Obvious compressive residual stress and plastic deformed with a maximum value of about -723 MPa and a depth of about 229 μm were also introduced into the sample surface. Under a dry friction environment, the samples that underwent the USR treatments exhibited significantly enhanced wear resistance, and six rolling passes were found to be the most suitable treatment.

scholarly journals Determination of the Optimal Coverage for Heavy-Duty-Axle Gears in Shot Peening

2021 ◽  
Author(s):  
Hongzhi Yan ◽  
Pengfei Zhu ◽  
Zhi Chen ◽  
Hui Zhang ◽  
Yin Zhang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Dislocation Density ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Heavy Duty ◽  
High Coverage ◽  
Service Lifetime ◽  
Maximum Value

Abstract Pitting and wear often appear on heavy-duty-axle gears due to their harsh working conditions, such as high torques, high loads and poor lubrication. Shot peening is a popular surface strengthening method for gears. In order to ensure complete coverage during shot peening, 100%~200% coverage is usually prescribed for most gears. However, it is difficult to effectively improve the contact fatigue and wear resistance of heavy-duty-axle gears. Generally, increasing shot peening coverage can heighten the compressive residual stress for prolonging the service lifetime of gears. Whereas, high coverage levels may cause the deterioration of surface roughness, thus increase the noise and vibration of gears. To address this issue, this paper deals with the determination of optimal coverage for heavy-duty-axle gears by experimental tests. The influence of shot peening coverage on the surface integrity of gears is analyzed in terms of residual stress, microhardness, surface morphology and dislocation density. The results show that the maximum compressive residual stress increases first and then keeps stable with the increase of coverage, and the maximum value is −1172.10 MPa. The microhardness peak increases obviously in the beginning and then slowly rises with the increase of coverage, and the maximum value is 747.5 HV1.0. The surface roughness (Ra) decreases initially and then enhances with the increase of coverage, and the minimum value is 0.99 μm under the coverage of 1000%. The dislocation density increases with the increase of coverage, and the maximum value is 3.70×1016 m-2. Numerous damages (microscalings, spallings) occur on the treated gear tooth flank affecting the residual stress distribution and roughness under high coverage levels. Taking into consideration of service lifetime, working noise and economic efficiency, the coverage of 1000% is the optimal coverage for heavy-duty-axle gears in shot peening.

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