In-situ Local Stress Measurement near Notch Tip in Alumina Ceramics Using Synchrotron Radiation Source

Yoshihisa SAKAIDA, Keisuke TANAKA, Yoshiaki AKINIWA, Yozo SAWAKI
2003 Journal of the Society of Materials Science Japan  
In order to measure loading and residual stresses near the notch tip in Al2O3 ceramics using a micro X-ray beam of SPring 8 (super Photon ring-8GeV), X-ray elastic constants were first determined experimentally. Mechanical elastic constants of the used material were E=372 GPa and v=0.23. The diffraction from Al203 2.0.14 plane by 8keV radiunder a four-point bending load were measured across the minimum ligament of SEVNB (Single-Edge-V-notched Beam) specimen by scanning the micro X-ray beam
more » ... the x-axis. The stress concentration near the notch root was first difficult to be measured directly because of the grinding residual stress by V-notch machining. After annealdegradation of the measured stresses in the notch tip was caused by the X-ray irradiation to the notch, and almost agreed with the results of a finite element analysis. The local stress and residual stresses were found to be measured
doi:10.2472/jsms.52.1225 fatcat:qkin7wvi2jdtnhz4t6vxpuh6jy