Strength of a Ceramic Sectored Flexural Test Specimen

Strength of a Ceramic Sectored Flexural Test Specimen
Author: A. A. Wereszczak
Publisher:
Total Pages: 7
Release: 2008
Genre: Ceramics
ISBN:

A new test specimen, defined here as the "sectored flexural strength test specimen," was developed to measure the strength of ceramic tubes specifically for circumstances when flaws located at the tube's outer diameter are the strength-limiter when subjected to axial tension. The understanding of such strength-limitation is relevant when ceramic tubes are subjected to bending or when the internal temperature is hotter than the tube's exterior (e.g., heat exchangers). The test specimen is both economically and statistically attractive because eight test specimens (eight in the case of this project?but the user is not necessarily limited to eight) were extracted out of each length of tube. An analytic expression for maximum (or failure) stress, and relationships portraying effective area and effective volume as a function of Weibull modulus were developed. Lastly, it was shown through the testing of two ceramics that the sectored flexural specimen was very effective; it produced failures caused by strength-limiting flaws located on the tube's original outer diameter.

Correlation Between Strength Properties in Standard Test Specimens and Molded Phenolic Parts

Correlation Between Strength Properties in Standard Test Specimens and Molded Phenolic Parts
Author: P. S. Turner
Publisher:
Total Pages: 94
Release: 1946
Genre: Molding (Chemical technology)
ISBN:

This report describes an investigation of the tensile, flexural, and impact properties of 10 selected types of phenolic molding materials. The materials were studied to see in what ways and to what extent their properties satisfy some assumptions on which the theory of strength of materials is based: namely, (a) isotropy, (b) linear stress-strain relationship for small strains, and (c) homogeneity. The effect of changing the dimensions of tensile and flexural specimens and the span-depth ratio in flexural tsts were studied. The strengths of molded boxes and flexural specimens cut from the boxes were compared with results of tests on standard test specimens molded from teh respective materials.