Load Induced Residual Stress Changes in Carburized Steel — Computations and Experiments

1982 ◽  
pp. 39-47 ◽  
Author(s):  
Lennart Magnusson ◽  
Torsten Ericsson
Keyword(s):  
Residual Stress ◽  
Carburized Steel ◽  
Stress Changes

Analysis of Thermal Stresses and Residual Stress Changes in Railroad Wheels Caused by Severe Drag Braking

1977 ◽  
Vol 99 (1) ◽  
pp. 18-23 ◽  
Author(s):  
M. R. Johnson ◽  
R. E. Welch ◽  
K. S. Yeung
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Yield Point ◽  
Thermal Stresses ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Residual Stress Field ◽  
Thermal Stress Field ◽  
Stress Changes ◽  
Railroad Wheels

A finite-element computer program, which takes into consideration nonlinear material behavior after the yield point has been exceeded, has been used to analyze the thermal stresses in railroad freight car wheels subjected to severe drag brake heating. The analysis has been used with typical wheel material properties and wheel configurations to determine the thermal stress field and the extent of regions in the wheel where the yield point is exceeded. The resulting changes in the residual stress field after the wheel has cooled to ambient temperature have also been calculated. It is shown that severe drag braking can lead to the development of residual circumferential tensile stresses in the rim and radial compressive stresses in the plate near both the hub and rim fillets.

Macro-Residual Stress Field Retrieval for Predicting the Machining Deformation of Non-Prestretched Plate

2011 ◽  
Vol 317-319 ◽  
pp. 386-392
Author(s):  
Yin Fei Yang ◽  
Ning He ◽  
Liang Li
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Large Scale ◽  
Hole Drilling ◽  
Residual Stress Field ◽  
Hole Drilling Method ◽  
Machining Deformation ◽  
Stress Changes ◽  
Drilling Method ◽  
And Control

The unknown and uneven macro-residual stresses in blanks will cause deformation on large-scale component, especially in non-prestretched plates. Based on the retrieval of stress field by measuring stress changes due to the rebalance of stresses after machining, a new idea is proposed in this paper to predict and control the machining deformation of large-scale components. It consists of analysis of the machining deformation, retrieval of macro-residual stress field, and finally optimization of following cutting process. In the retrieval process, the stresses are measured with an improved hole-drilling method and the measured data are then interpolated to 3D stress field.

scholarly journals Texture and Stress Evolution in HfN Films Sputter-Deposited at Oblique Angles

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 712 ◽  
Author(s):  
Grégory Abadias ◽  
Fırat Anğay ◽  
Rubenson Mareus ◽  
Cédric Mastail
Keyword(s):  
Crystal Structure ◽  
Residual Stress ◽  
Tilt Angle ◽  
Particle Flux ◽  
Substrate Surface ◽  
Crystal Habit ◽  
Average Kinetic Energy ◽  
Oblique Angle Deposition ◽  
Stress Evolution ◽  
Stress Changes

In this study, polycrystalline hafnium nitride (HfN) thin films were grown by oblique angle deposition (OAD) technique to investigate the relationship between column tilt angle, texture development and residual stress evolution with varying inclination angle α of the substrate. The films (~1 μm thickness) were grown at various angles (α = 5°, 25°, 35°, 65°, 75°, and 85°) with respect to the substrate normal by reactive magnetron sputtering at 0.3 Pa and 300 °C. The film morphology, crystal structure and residual stress state were characterized by scanning electron microscopy and X-ray diffraction (XRD), including pole figure and sin2ψ measurements. All HfN films had a cubic, NaCl-type crystal structure with an [111] out-of-plane orientation and exhibited a biaxial texture for α ≥ 35°. XRD pole figures reveal that the crystal habit of the grains consists of {100} facets constituting triangular-base pyramids, with a side and a corner facing the projection of the incoming particle flux (indicative of a double in-plane alignment). A columnar microstructure was formed for α ≥ 35°, with typical column widths of 100 nm. It is observed that the column tilt angle β increases monotonously for α ≥ 35°, reaching β = 34° at α = 85°. This variation at microscopic scale is correlated with the tilt angle of the (111) crystallographic planes, changing from −24.8 to 11.3° with respect to the substrate surface. The residual stress changes from strongly compressive (~−5 GPa at α = 5°) to negligible or slightly tensile for α ≥ 35°. The observed trends are compared to previous works of the literature and discussed based on existing crystal growth and stress models, as well as in light of energy and angular distribution of the incident particle flux calculated by Monte Carlo. Importantly, a decrease of the average kinetic energy of Hf particles from 22.4 to 17.7 eV is found with increasing α due to an increase number of collisions.

Studies of Half-Cell for Anode Supported SOFC after Reduction

2011 ◽  
Vol 287-290 ◽  
pp. 2511-2515 ◽  
Author(s):  
Xia Wang ◽  
Feng Hui Wang
Keyword(s):  
Residual Stress ◽  
Solid Oxide Fuel Cells ◽  
Hydrogen Reduction ◽  
Solid Oxide ◽  
X Ray Diffraction ◽  
Electrolyte Layer ◽  
Half Cell ◽  
X Ray ◽  
Stress Changes ◽  
Different Temperatures

The performance of half-cell for anode supported Solid Oxide Fuel Cells (SOFCs) is necessary to wide use of SOFCs. This work is to study the reduction degree of anode and the residual stress changes that occur during hydrogen reduction on the different temperatures and in different times. The porosity of the specimens with oxidation is less than that of the reduction one. There is no Ni phase in the sample before hydrogen reduction. After hydrogen reduction on 1000°C for 6 hours, there is no NiO phase in the sample. It reveals the NiO has been reduced into Ni completely. We also investigate residual stresses in the electrolyte layer using X-ray diffraction. The residual stress value of electrolyte is about -844.1MPa before reduction. After hydrogen reduction on 800°C for 9 hours, the residual stress is decreased to -474.8MPa. So the reduction temperature can choose as 600°C and the reduction time can choose as 9 hours.

Relation between Concave Cone 3 Dimension Topography and Residual Stress in Thermal Barrier Coatings

2011 ◽  
Vol 291-294 ◽  
pp. 172-175
Author(s):  
Zhi Yong Han ◽  
Huan Wang
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Compressive Stress ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Barrier Coating ◽  
Stress Changes ◽  
Unit Stress

Considering the concave cone 3 dimension interface topography unit, the distribution of residual stress in thermal barrier coating was calculated using ABAQUS soft by finite element method. The calculating result shows that the residual stress is affected by interface topography unit obviously. Compressive stress exists in concave cone topography unit. Stress concentrates in boundary of topography unit and reaches maximal value at the lowest place of the topography. Compressive stress changes with the size of topography unit and the space between two topography units distinctly.

Effect of Ultrasonic Impact Treatment on the Residual Stress Distribution of Electron Beam Welded TA15/BTi-6431S Dissimilar Titanium Alloys

2019 ◽  
Vol 944 ◽  
pp. 104-109
Author(s):  
Xiao Yun Song ◽  
Guang Lu Qian ◽  
Ming Yu Zhao ◽  
Yu Wei Diao ◽  
Wen Jun Ye ◽  
...  
Keyword(s):  
Residual Stress ◽  
Electron Beam ◽  
Stress Distribution ◽  
Fusion Zone ◽  
Residual Stress Distribution ◽  
Ultrasonic Impact Treatment ◽  
Welding Joint ◽  
Stress Changes ◽  
Ta15 Alloy ◽  
Martensite Structure

Ti-6.5Al-2Zr-1Mo-1V (TA15) and Ti-6.5Al-3Sn-3Zr-3Mo-3Nb-1W-0.2Si (BTi-6431S) dissimilar titanium alloy plates were welded through electron beam welding (EBW) method and different ultrasonic impact treatment (UIT) technologies were performed on the weldment. The effects of UIT on the microstructure and residual stress distribution and mechanical properties for the welding joint were investigated. A significant microstructural change occurs after welding. The structure of welding joint is composed of fusion zone (FZ), heat-affected zone (HAZ) and base metal. The microstructure of FZ is composed of martensite structure and a clear interface is observed because of the fusion of dissimilar alloys. HAZ near fusion zone is comprised of martensite structure, while the grain size is much smaller than that in FZ. The HAZ microstructure near TA15 alloy is composed of coarse equiaxed α phases and HAZ microstructure near BTi-6431S alloy is lamellar α phases. Through ultrasonic impact treatment for three times, the residual stress near the welding joint shows a uniform distribution and the maximum tensile stress changes to compressive stress. A characteristic asymmetrical microhardness profile is observed in TA15/BTi-6431S dissimilar alloy welded joint. The HAZ in BTi-6431S alloy side possesses higher hardness compared with that in TA15 alloy side. The microhardness and tensile properties change slightly after ultrasonic impact treatment.

Berührungslose Analyse des Sägebandzustands/Contactless saw blade analysis. Investigation of saw blade conditions using the Barkhausen Effect

2020 ◽  
Vol 110 (01-02) ◽  
pp. 39-44
Author(s):  
Jonas Duntschew ◽  
Sarah Eschelbacher ◽  
Thomas Stehle ◽  
Hans-Christian Möhring
Keyword(s):  
Residual Stress ◽  
Condition Monitoring ◽  
Measuring System ◽  
Monitoring Systems ◽  
Barkhausen Noise ◽  
Barkhausen Effect ◽  
Drive Current ◽  
Stress Changes ◽  
Saw Blade ◽  
Process Measurements

Im Bereich der Bandsägeprozesse werden Verschleißzusammenhänge meist aus dem Antriebsstrom und einer Bandspannungsüberwachung prognostiziert. In-Prozess-Messungen zur Identifizierung von Rissen oder Eigenspannungsänderungen finden hier bisher nur unzureichend Anwendung. Für eine prozessbegleitende Zustandsüberwachung bei Sägebändern wird in der vorgestellten Versuchsreihe der Einsatz eines Messsystems zur Aufzeichnung des Barkhausen-Rauschens geprüft und es werden erste Signalzusammenhänge dargestellt.   In the field of band sawing processes, wear relationships are usually predicted from the drive current and band tension monitoring systems. In-process measurements for the identification of cracks or residual stress changes have only been used insufficiently so far. In order to implement an online condition monitoring of saw bands, the use of a measuring system recording the Barkhausen noise is tested in the scope of a test series and first signal correlations are presented.

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