Failure Causing Defects in Ceramics: What NDE Should Find

NDE for Bulk Defects in Ceramics

A 50 MHz C-scan imaging system is used to find defects in ceramics. The imaging system consists of a microcomputer-controlled scanner for data acquisition and signal conditioning. Synthetic aperture imaging at 50 MHz is carried out to obtain 3-D images of flaws. Image reconstruction is accomplished digitally on a minicomputer. A square synthetic aperture is used to image flaws in flat disc samp...

Accept-Reject Decisions and Probabilistic Failure Prediction

The purpose of this paper is to discuss recent progress in the development of an NDE decision formalism applied to the case of brittle fracture in ceramics. The on-line input into the formalism is a set of nondestructive (ND) measurements and the on-line output is the probability of failure conditioned on the above measurements. The final accept-reject decision depends only upon the comparison ...

Inm-7: Genetic Etiologies of Premature Ovarian Failure

Premature Ovarian Failure (POF) defined as functional stop of ovaries before the age of 40. It is a common cause of infertility in women that characterized by primary or secondary amenorrhea, high gonadotropin levels and estrogen level declining in patients. Factors that reduce follicle or defect in the follicle growth stimulating mechanism defined as numerous complication factors that they can...

NDE of Ceramics and Ceramic Composites

Microwave NDE of Ceramics

The objective of this work is to evaluate the potential of microwave techniques for detecting, classifying, and determining the dimensions of inclusions and surface cracks in structural ceramics such as Si3N4. Experimental results that show the feasibility of detecting various types of inclusions and voids in Si3N4 have been obtained, and these results are reviewed. In addition, the question of...