Internal Stress Measurement of Weld Part Using Diffraction Spot Trace Method

2014 ◽  
Vol 777 ◽  
pp. 155-160 ◽  
Author(s):  
Kenji Suzuki ◽  
Takahisa Shobu ◽  
Ayumi Shiro ◽  
Shuo Yuan Zhang
Keyword(s):  
Stress Measurement ◽  
Fem Simulation ◽  
Gauge Length ◽  
The Other ◽  
Diffraction Spot ◽  
Coarse Grain ◽  
Bending Stress ◽  
Diffraction Angle ◽  
Slit System ◽  
Internal Stress Measurement

The spiral slit-system was improved in order to make a gauge length regularity. The bending stress was measured by the improved spiral slit-system, and the measured stresses corresponded to the applied stress regardless of the diffraction angle. As a result, the validity of the improved spiral slit-system was proved. On the other hand, the diffraction spot trace method (DSTM), which combined the spiral slit-system and a PILATUS detector, was proposed to measure stress in a coarse grain. In this study, the distribution of the residual stress in a melt-run welding specimen was measured using the DSTM. The welding residual stresses measured accorded with that by the FEM simulation.

The Experimental Study of Diffraction Angle of Aluminum Alloy 3003

2012 ◽  
Vol 625 ◽  
pp. 291-296
Author(s):  
Neng Quan Duan ◽  
Jian Liang Ren ◽  
Rui Qiang Pang
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Stress Measurement ◽  
Electrical Measuring ◽  
Diffraction Method ◽  
Measuring Method ◽  
X Ray ◽  
Equal Strength ◽  
Diffraction Angle ◽  
Stress Measuring

The most suitable diffraction angle of aluminum alloy 3003 used for stress measuring is aimed to be determined in this paper. The experiment makes a stress measurement of a loading aluminum alloy 3003 equal strength beam with the traditional electrical measuring method and the X-ray stress measurement. With the electrical measuring method as reference, the research study the measured values that acquired from the X-ray diffraction method when the diffraction angle are 142° and 156°, and then compare them with that acquired from electrical measuring method. The measurement results demonstrate that the diffraction angle at 156 ° is better than at 142 ° based on the assessment standards of the liner slope and the distribution of data. Thus the optimum diffraction angle for X-ray to measure the macroscopic stress of aluminum alloy 3003 is 156 °. In this paper，the stress caused by the load on the equal strength beam is assumed to be "residual stress" and thus the conclusion has reference values for the standardization of residual stress measurement of aluminum alloy by XRD and has theoretical guiding significance in the production practices.

Diffraction Plane Dependence of X-ray Elastic Constants of Alumina

1989 ◽  
Vol 33 ◽  
pp. 363-372 ◽  
Author(s):  
Masanori Kurita ◽  
Ikuo Ihara ◽  
Akira Saito
Keyword(s):  
Confidence Intervals ◽  
Elastic Constants ◽  
Stress Measurement ◽  
Diffraction Line ◽  
Diffraction Plane ◽  
X Ray ◽  
Diffraction Angle ◽  
Curve Method ◽  
Voigt Model ◽  
Accurate Stress

AbstractThe 95% confidence linits of the x-ray elastic and stress constants of α-alumina were detemined from seven kinds of diffraction planes by the Gaussian curve method in order to investigate the diffraction plane dependence of the eonstants. No difference in the elastic constants larger than their 95% confidence intervals was observed for most diffraction planes. Also, the measured elastic constants for most planes were closer to the values calculated from the Voigt model than those from the Reuss model. Since the diffraction line of the (410) plane measured with cobalt Kα radiation by using an automated x-ray stress analyzer locates at the highest diffraction angle of 168.4, the use of this plane will allow the most accurate stress measurement. Also, the measured x-ray elastic constants for the (410) plane almost agreed with both values calculated from the Voigt and Reuss models. Therefore, the (410) plane is the most appropriate plane for x-ray stress measurement of alumina.

Peculiarities of Internal Stress Measurement in Ferromagnetic Materials Using Barkhausen Effect and Other Magnetic Techniques

NDT World ◽  
2018 ◽  
pp. 5-9
Author(s):  
Валерий Венгринович ◽  
Valeriy Vengrinovich ◽  
Дмитрий Винтов ◽  
Dmitry Vintov ◽  
Андрей Прудников ◽  
...  
Keyword(s):  
Internal Stress ◽  
Stress Measurement ◽  
Ferromagnetic Materials ◽  
Barkhausen Effect ◽  
Magnetic Techniques ◽  
Internal Stress Measurement

The Analysis for the Leaking Flowrate in the Plane Valveplate

2014 ◽  
Vol 610 ◽  
pp. 46-51 ◽  
Author(s):  
Jie Wei ◽  
Chun Yang Shan
Keyword(s):  
Flow Field ◽  
Boundary Conditions ◽  
Fem Simulation ◽  
The Other ◽  
Math Model ◽  
Computation Result ◽  
The Press ◽  
Computation Formula ◽  
The Common ◽  
Flow Inertia

A new computation for the leaking flowrate in the plane valveplate sector of the pistons pump considering the influence of the flow inertia is proposed. Establish the theoretical math model about the flow field, based in the N-S equation and the sequence equation, and the leaking flowrate in the plane valveplate sector considering the influence of the flow inertia is computed in the boundary conditions of the press and the velocity. It is not the same as the common formula that the leaking flowrate computation formula established in this paper includes the factor of the flow inertia in the plane valveplate sector, which can reflect the influence of the flow inertia. The theory computation is checked by the FEM simulation. The theory computation result is approximate with the simulation result. The computing results indicate that the leaking flowrate of the plane valveplate sector increases when the press and the height of the seam increase, just as the other conditions are the same. And the flow inertia leads to the increase of the leaking flowrate, the influence is obvious in some conditions.

Influence of Preparing of Specimen on Internal Stress Measurement of Aluminum Alloy Thick Plate

2010 ◽  
Vol 97-101 ◽  
pp. 2658-2663
Author(s):  
Kai Liao ◽  
Yun Xin Wu ◽  
Hai Gong
Keyword(s):  
Stress Distribution ◽  
Internal Stress ◽  
Surface Stress ◽  
Thick Plate ◽  
Stress Measurement ◽  
Stress Gradient ◽  
Real Surface ◽  
Measurement Results ◽  
Layer Removal Method ◽  
Internal Stress Measurement

The cut, a main preparing means of specimen, will cause a difference in stress distribution between thick plate and the specimen, so this article focuses on the topic of evaluating impact of the cut on stress measurement results. Firstly, the real surface stress distribution of the plate and specimen were determined by X-ray diffraction (XRD) and FEM. Secondly, according to the specimen dimension and machining procedure, the influence of the cut on internal stress measurement is obtained and compared with the FEM results. The conclusions are as follows: (1) the normal stress of cut plane steeply decreases and the stress gradient descends along with distance away from the cut. The range of distance is approximately one-thickness of specimen. (2) In order to obtain stable and reliable results, the plane size of specimen is taken three times larger than the thickness. (3) The milling processing of layer removal method (LRM) can change the surface stress state of specimen, but the machining effects on residual stresses can be removed by properly choosing milling parameters.

The Clever Use of Neutron-Axis of the Girder in the Stress Measurement of the Large Span PC Cable Stayed Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 1696-1701
Author(s):  
Yu Feng Xu
Keyword(s):  
Normal Stress ◽  
Stress Measurement ◽  
The Other ◽  
New Method ◽  
Construction Control ◽  
Large Span ◽  
Cable Stayed Bridge ◽  
Creep Coefficient ◽  
Horizontal Part ◽  
Cable Force

As the stress measurement of interior concrete is hard in the construction control of the cable- stayed bridge, a new method fitted for stress measurement in large span PC concrete cable-stayed bridge is proposed in this paper. This method is based on the principle that the normal stress in neutron-axis of girder is only decided by the horizontal part of the cable force. First, the normal stress on the neutron-axis of girder is calculated by the measured cable force, and then the creep coefficient is identified, and finally the other stresses are worked out. This method has been applied to a large span PC cable-stayed bridge constructed in process with favourable results and thus proves its accuracy and efficiency.

Study on the accelerated-point distribution of floating fibers in the drafting zone

2021 ◽  
pp. 004051752110592
Author(s):  
Na Sun ◽  
Na Sun
Keyword(s):  
High Velocity ◽  
Gauge Length ◽  
Point Of View ◽  
The Other ◽  
Low Velocity ◽  
Point Distribution ◽  
Actual Contact ◽  
Frictional Forces

The motion of floating fibers in the drafting zone has a significant effect on the sliver quality after drafting. In this study, the distribution of the accelerated point of floating fibers in the drafting area was simulated based on the distribution of fibers and frictional forces during the drafting process. The simulated results denoted that the acceleration distribution of the floating fibers was more concentrated and closer to the front roller as the drafting ratio increases. The distributions of accelerated points of the floating fibers became more and more decentralized and further away from the front roller as the gauge length grew when the other parameters remained constant. In the simulation, the frictional forces of the other floating fibers moving at high velocity and low velocity and the actual contact relationships of fibers in the drafting zone were taken into consideration. Moreover, whether the fiber lengths are identical or not, the simulated accelerated-point distributions of the floating fibers were demonstrated to conform more to the actual values compared to other models. Hence, the developed model can offer effective reference from the point of view of the distribution of accelerated points in order to realize the simulation of roller drafting.

Errors in Residual Stress Measurements due to Random Counting Statistics

1970 ◽  
Vol 14 ◽  
pp. 377-388 ◽  
Author(s):  
C. J. Kelly ◽  
M. A. Short
Keyword(s):  
Residual Stress ◽  
Standard Deviation ◽  
Stress Measurement ◽  
Mathematical Expression ◽  
X Ray Diffraction ◽  
Intensity Maximum ◽  
X Ray ◽  
Diffraction Angle ◽  
Data Points ◽  
Counting Statistics

AbstractThe measurement of residual stress, using X-ray diffraction techniques, is based on the change in diffraction angle determined for the Intensity maximum of some suitable reflection from the sample when this is placed consecutively with its surface at two different angles to the diffracting planes. These diffraction angles may be obtained in a variety of ways, but are most often calculated from measurements of three X-ray diffraction intensities at angles selected in the immediate vicinity of the peak maximum at each sample angle and fitting each set of data to a parabolic curve. A simple mathematical expression may be derived relating the diffraction angles, and hence the residual stress, to the measured X-ray intensities; there will, however, be statistical errors in the calculated diffraction angles due to random counting errors in the measurement of the X-ray diffraction intensities. From the expression relating the residual stress to the X-ray intensities an equation has been derived giving the standard deviation in the residual stress due to random counting errors. In addition, a simple approximation has been obtained from this equation showing that the standard deviation is decreased by increasing the number of counts accumulated for each X-ray intensity measurement and by increasing the size of the angular increments between the data points. It will also be shown that, using the approximation, it is possible to estimate in advance the number of accumulated counts at each point necessary to attain a desired standard deviation in a residual stress measurement.

X-Ray Stress Measurement of Ni-Ai System Intermetallic Compounds

1995 ◽  
Vol 39 ◽  
pp. 243-249
Author(s):  
Tokimasa Goto ◽  
Hiroyuki Tabata ◽  
Yukio Hirose
Keyword(s):  
Intermetallic Compounds ◽  
Stress Measurement ◽  
Preferred Orientation ◽  
Coarse Grain ◽  
X Rays ◽  
Melting Method ◽  
X Ray ◽  
Arc Melting ◽  
Coarse Grains ◽  
Heat Resisting Materials

The microstructures and mechanical properties of Ni-Al system intermetallic compounds used as heat resisting materials have been investigated by many researchers[l,2], but there are few studies applying X-ray stress measurement to these materials[3]. Two problems make it difficult: One is the comparatively coarse grain size, the other is the strong preferred orientation along the direction of the solidification. Therefore, it become possible to evaluate mechanical behavior in these materials, if we can measure the residual stresses correctlv by X-rays.In this paper, Ni-25mol%AI(Ni3Al) made by the arc-melting method was employed. It consists of comparatively coarse grains and has strong preferred orientation along the direction of the solidification.

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