The Vibratory Stress Relief of Drill Pipe

2005 ◽  
Vol 490-491 ◽  
pp. 300-304
Author(s):  
Y.B. Zhang ◽  
S.W. Chen ◽  
C.J. Liu ◽  
Y.H. Sun ◽  
M.C. Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Standing Wave ◽  
Drill Pipe ◽  
Stress Relief ◽  
Stress Relieving ◽  
Active Service ◽  
Before And After ◽  
Drill Pipes ◽  
Considerable Deformation

Drill pipe is made from 35CrMnMo. The used drill pipes were curved, when they were aligned and deformed, there is high macro residual stress in the aligned used drill pipe. In active service, the macro residual stress releases and thus causes considerable deformation of the aligned used drill pipe. The vibratory stress relief is introduced to the aligned used drill pipe. The vibratory stress relief of the aligned used drill pipe was carried out. The mechanical properties of the aligned used drill pipe were measured before and after vibration. Seven points vibratory stresses were measured. The macro residual stress was measured before and after vibration. The macro residual stress decreased notably. The mechanical properties changed slightly. The vibratory wave is standing wave. The vibratory stress relief is valid for macro residual stress relieving of the aligned used drill pipe. The aligned used drill pipes were steady in latter active service. The mechanism of the macro residual stress relieving by vibration on the aligned used drill pipe is discussed. The “double-dynamic mechanism” is introduced to explain the course of macro residual stress relieving in the test.

scholarly journals The visceral pericardium: macromolecular structure and contribution to passive mechanical properties of the left ventricle

2007 ◽  
Vol 293 (6) ◽  
pp. H3379-H3387 ◽  
Author(s):  
Paul D. Jöbsis ◽  
Hiroshi Ashikaga ◽  
Han Wen ◽  
Emily C. Rothstein ◽  
Keith A. Horvath ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Ex Vivo ◽  
Second Harmonic ◽  
Three Dimensional ◽  
Left Ventricular ◽  
Opening Angle ◽  
Passive Stiffness ◽  
Photon Excitation ◽  
Before And After

Much attention has been focused on the passive mechanical properties of the myocardium, which determines left ventricular (LV) diastolic mechanics, but the significance of the visceral pericardium (VP) has not been extensively studied. A unique en face three-dimensional volumetric view of the porcine VP was obtained using two-photon excitation fluorescence to detect elastin and backscattered second harmonic generation to detect collagen, in addition to standard light microscopy with histological staining. Below a layer of mesothelial cells, collagen and elastin fibers, extending several millimeters, form several distinct layers. The configuration of the collagen and elastin layers as well as the location of the VP at the epicardium providing a geometric advantage led to the hypothesis that VP mechanical properties play a role in the residual stress and passive stiffness of the heart. The removal of the VP by blunt dissection from porcine LV slices changed the opening angle from 53.3 ± 10.3 to 27.3 ± 5.7° (means ± SD, P < 0.05, n = 4). In four porcine hearts where the VP was surgically disrupted, a significant decrease in opening angle was found (35.5 ± 4.0°) as well as a rightward shift in the ex vivo pressure-volume relationship before and after disruption and a decrease in LV passive stiffness at lower LV volumes ( P < 0.05). These data demonstrate the significant and previously unreported role that the VP plays in the residual stress and passive stiffness of the heart. Alterations in this layer may occur in various disease states that effect diastolic function.

scholarly journals Impacts of Stress Relief Treatments on Microstructure, Mechanical and Corrosion Properties of Metal Active-Gas Welding Joint of 2205 Duplex Stainless Steel

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4272
Author(s):  
Xiao-qin Zha ◽  
Yi Xiong ◽  
Tian Zhou ◽  
Yong-feng Ren ◽  
Peng-hui Hei ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Welded Joints ◽  
Stress Relief ◽  
2205 Duplex Stainless Steel ◽  
Ultrasonic Peening ◽  
Stress Relieving

Stress relief treatments were carried out separately with a pneumatic chipping hammer, ultrasonic peening treatment, and heat treatment for metal active-gas welding (MAG) welded joints of 2205 duplex stainless steel. The effects of these methods on the residual stress, microstructure, mechanical properties and corrosion resistance of welded joints were studied. Results show the stress state of the weld and the surrounding area was effectively improved by the pneumatic chipping hammer and ultrasonic peening treatment, and the residual stress field of the surface layer changed from tensile stress to compressive stress. On the contrary, low-temperature stress relieving annealing had no obvious effect on stress distribution. After the pneumatic chipping hammer and ultrasonic peening treatment, the welded joints were machined and hardened. Correspondingly, strength and hardness were improved. However, the heat treatment only led to a slight decrease in strength and hardness due to the static recovery of the welded joint structure. All stress relief methods effectively improved the corrosion resistance of welded joints, with the ultrasonic peening treatment giving the best performance.

scholarly journals Improvement of mechanical properties and fatigue life by shot peening process on ASTM A516 Grade 70 steel

2018 ◽  
Vol 14 (4) ◽  
pp. 440-442
Author(s):  
Mohd Rashdan Isa ◽  
Omar Suliman Zaroog ◽  
Kalaikathir Murugan ◽  
Sharif Osman Kabashi Guma ◽  
Fareg Saeid Ali
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Tensile Strength ◽  
Fatigue Life ◽  
Fatigue Test ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Industrial Sector ◽  
Low Intensity ◽  
Before And After

ASTM A516 Grade 70 is widely used in the industrial sector as it provides very good mechanical properties in tough conditions. The main usage of this material is in moderate and low operating services. This paper focuses on the effect of shot peening process on ASTM A516 Grade 70 on improving the mechanical properties and fatigue life of the material. Samples have been shot peened with steel shot to induce compressive residual stress. Hardness, tensile and fatigue test as well as microstructure were done on the samples before and after shot peening process to study the effects on mechanical properties. The result shows that there is an increment in every test after shot peening process. There is a slight increment of 0.47% in hardness value, 0.39% increment in tensile strength and 6.78% increment in fatigue life of the material after shot peening process applied. The slight increment in every result was due to the low intensity of the shot peening process. Result also shows that the shot peening process compressed the molecules closer to each other as can be seen under SEM. Therefore it was proven that in this study, there is a very significant improvement in mechanical properties and fatigue life by shot peening process on ASTM A516 Grade 70 Steel.

Research on the Vibratory Stress Relief Used to Reduce Residual Stress of Mismatch Butt Welds of a Cylinder

2007 ◽  
Author(s):  
Xin Ren ◽  
Yuan Tian ◽  
Zengliang Gao ◽  
Kangda Zhang
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Stress Relief ◽  
Butt Weld ◽  
Butt Welds ◽  
Blind Hole ◽  
Dissimilar Steel ◽  
Weld Residual Stress ◽  
Before And After

The residual stresses of mismatch butt welds of a cylinder were measured by the blind-hole method before and after a vibratory residual stress relief treatment. The results show that this treatment could greatly reduce the maximal butt weld residual stress of dissimilar steel from 540MPa to 119MPa. The concentrated distributions of the first and the second principal residual stresses became gentle after the vibratory residual stress relief treatment.

Research on High-Frequency Vibratory Stress Relief of Small Cr12MoV Quenched Specimens

2012 ◽  
Vol 157-158 ◽  
pp. 1157-1161 ◽  
Author(s):  
Wen He ◽  
Bang Ping Gu ◽  
Jian Yi Zheng ◽  
Run Jie Shen
Keyword(s):  
Residual Stress ◽  
High Frequency ◽  
Low Frequency ◽  
Stress Relief ◽  
Vibration Level ◽  
High Frequency Vibration ◽  
Low Frequency Vibration ◽  
Before And After

Considering that most of the research on vibratory stress relief (VSR) is excited by low-frequency vibration at present, high-frequency-exciting VSR on small Cr12MoV quenched specimens was studied. A high-frequency vibration table system was adopted as the exciter of the VSR. To increase the vibration level, a novel vibration level amplifying device was put forward. High-frequency VSR on the same group of small Cr12MoV quenched specimens was carried out under various vibration levels. The residual stress before and after vibration was comparatively analyzed. The results showed that the high-frequency vibration had the better effect on eliminating and homogenizing the residual stress and that increasing the vibration level of high-frequency-exciting could improve the effect of high-frequency VSR.

Residual stresses in the aluminium alloy 2014A subject to PAG quenching and vibratory stress relief

2021 ◽  
pp. 030932472110053
Author(s):  
Jeremy S Robinson ◽  
M Sayeed Hossain ◽  
Christopher E Truman
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Cold Water ◽  
Stress Relief ◽  
Industry Standard ◽  
Heat Treated ◽  
Stress Relieving ◽  
Polyalkylene Glycol ◽  
The Impact

Generic hollow pump bodies made from aluminium alloy 2014A forgings have been solution heat treated and quenched into either cold water or polyalkylene glycol (PAG) solutions. An industry standard PAG type synthetic quenchant was evaluated, and the influence of two concentrations of the PAG solution on residual stress in the pump bodies was characterised, using neutron and X-ray diffraction. These residual stresses were then compared to those resulting after a pump in the as quenched condition was subject to a widely known but controversial commercial vibratory stress relieving procedure. The use of neutron diffraction allowed the through thickness residual stresses to be evaluated in the pumps. Results demonstrate that PAG quenching is highly effective at significantly reducing residual stress when compared to cold water quenching, but the impact is non uniform and cannot be simply quantified. In this investigation, we prove the effect of vibratory stress relief is negligible, and much less than that achieved by PAG quenching.

Comparison of Neutron and Synchrotron Diffraction Measurements of Residual Stress in Bead-on-Plate Weldments

2010 ◽  
Vol 132 (1) ◽  
Author(s):  
Anna M. Paradowska ◽  
John W. H. Price ◽  
Trevor R. Finlayson ◽  
Ulrich Lienert ◽  
Raafat Ibrahim
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Residual Strain ◽  
Development Process ◽  
Synchrotron Diffraction ◽  
Stress Relieving ◽  
Before And After ◽  
Strain Stress ◽  
Good Agreement

This paper explores the use of neutron and synchrotron diffractions for the evaluation of residual stresses in welded components. It has been shown that it is possible to achieve very good agreement between the two independent diffraction techniques. This study shows the significance of the weld start and end sites on the residual strain/stress distribution. Quantitative evaluation of the residual stress development process for multibead weldments has been presented. Some measurements were also taken before and after postweld stress relieving to establish the reduction and redistribution of the residual stress. The detailed measurements of residual stress around the weld achieved in this work significantly improve the knowledge and understanding of residual stress in welded components.

Research on Vibration Stress Relief for Cured SU-8 Photoresist Layer

2015 ◽  
Vol 1094 ◽  
pp. 487-490
Author(s):  
Qun Feng Yang ◽  
Jian Yi Zheng ◽  
Jun Qing Wang ◽  
Xue Nan Zhao ◽  
Da Yin Wei ◽  
...  
Keyword(s):  
Thin Film ◽  
Residual Stress ◽  
Residual Stresses ◽  
Stress Relief ◽  
Excitation Current ◽  
Photoresist Layer ◽  
Before And After ◽  
Vibration Stress ◽  
Vibration Time ◽  
Vibration Parameters

The aim of this work is to reduce the residual stress in cured SU-8 Photoresist layer by vibration stress relief (VSR) method. The vibration device was designed according to the results of the ANSYS modal simulation, which was used for the thin film VSR. Meanwhile, some important influencing factors, such as the excitation current and the vibration time, have been discussed. The residual stress in the SU-8 layer was measured by profile method, and the values of residual stresses in the SU-8 layer before and after VSR were compared. The experimental results show that residual stress in SU-8 layer can be effectively eliminated or homogenized by VSR if the proper vibration parameters were chosen in the experiment.

Reducing Residual Stress in 7050 Aluminum Alloy Die Forgings by Heat Treatment

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
J. S. Robinson ◽  
D. A. Tanner
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fracture Toughness ◽  
Residual Stress ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Boiling Water ◽  
Hole Drilling ◽  
Subsequent Aging ◽  
Stress Relieving

Aerospace aluminum alloy forgings can have the residual stresses arising from heat treatment reduced by modification to the quench cooling rates and subsequent aging treatments. A series of propeller hubs usually made from the alloy 2014 have been closed die forged from the less quench sensitive alloy 7050. These forgings have been subjected to various quenching and aging treatments in an attempt to improve the balance of mechanical properties with the residual stress magnitudes. These forgings were not amenable to stress relieving by cold compression or stretching. Warm water (60°C) and boiling water quenches are investigated in addition to quenching into molten salt (200°C) and uphill quenching from −196°C. Various dual aging treatments including retrogression and reaging have been evaluated in an attempt to optimize low residual stress magnitudes with mechanical properties. Residual stresses determined by the center hole-drilling strain-gauge method are reported in addition to electrical conductivity, stress corrosion cracking, fracture toughness, initiation fatigue, and tensile mechanical property variations. It was found that quenching into boiling water and salt at 200°C did substantially reduce the residual stress but had only a small detrimental effect on the majority of the properties measured. However, the influence of quench rate on fracture toughness was much more significant. This is attributed to both coarse grain boundary precipitation and heterogeneous precipitation of η on Al3Zr dispersoids within the grains, which promotes easier crack propagation.

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