ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01005.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

AbstractThe early application of digital image processing (DIP) technique to automate photoelastic analysis is based on black and white (B&W) image processing systems. The various methodologies reported can be traced to rely upon one or several features of a B&W DIP system. With the advancements in computer technology, nowadays colour image processing systems are available at affordable prices. A systematic study has been carried out on how to use the red green blue (RGB) value recorded using a colour image processing system for determining fringe orders up to 3 in a fringe field. The study has revealed that instead of directly using RGB values corresponding to a dark field image, if the difference of RGB values between bright anddarkfield images is used, the number of noise points is less. Experiments have been carried out for several arbitrary lines in a circular disk under diametral compression and the results are found to be good.

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01006.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

AbstractThis paper presents a laser speckle method for the measurement of plastic zone ahead of a Y‐notch tip on metallic specimens. The method employs an unexpanded laser beam to illuminate the test object. Diffracted images are captured on a ground glass and recorded using a CCD camera. The recorded images were digitised and subsequently analysed on a personal computer. The plastic strain at the notch tip was correlated with its corresponding speckle image using a recently proposed parameter known as the integrated peak spectral intensity coefficient. Specimens containing Y‐notches of various angles were tested and the resu Its compared well with that predicted by the

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01007.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

AbstractA series of five tests have been conducted using cylindrical specimens having mean diameter/thickness (Dmlt) ratios in the range 9≤Dmlt ≤25. The cylinders were subjected to an internal pressure (calculated as the design pressure for each cylinder) and alternating bending moments at frequencies typical of seismic events. Hoop ratchetting was recorded in all cylinders at bending moments greater than the yield moment. The moment level for the onset of ratchetting was found to be in agreement with theoretical predictions. The variations in behaviour caused by changing D/t ratios is discus

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01008.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

AbstractThe mechanical methods based on milling rectilinear or annular grooves on a component's surface and measurement of relaxed strains are some of the most used semi‐destructive methods for the determination of residual stresses. These are evaluated from the relaxed strains by means of equations based upon the linear elastic theory. In this paper the errors due to yielding localised at the bottom of the groove have been investigated. The analyses were carried out by means of the finite element technique varying the most important parameters involved. The experimental results show a good agreement with the numerical one

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01009.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01010.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01011.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01012.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01013.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

ISSN:0039-2103    

DOI:10.1111/j.1475-1305.1996.tb01014.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY