Influence of the Sample Size on the Results of B3B-Tests

Abstract:

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The ball-on-three-balls (B3B)-test is a biaxial strength test for brittle materials. The results of B3B-tests are very stable against small geometrical inaccuracies of the specimens or the test support. In contrast to conventional bending tests there exists only a small influence of friction and edge defects are not relevant. These advantages, compared to beam tests, make the testing of mini-specimens with volumes of a few mm3 feasible. For this investigation silicon nitride specimens of different sizes were tested by use of the B3B-test. The maximum tensile stresses and the effective volumes and effective surfaces of the specimens were determined. The obtained results are compared directly and with the results of conventional 4-point-bending tests and are discussed in the framework of the Weibull-Theory. Additionally fracture surfaces of B3B-specimens and bending specimens were investigated fractographically to identify possible fracture origins.

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Periodical:

Edited by:

J. Dusza, R. Danzer, R. Morrell and G.D. Quinn

Pages:

176-184

DOI:

10.4028/www.scientific.net/KEM.409.176

Citation:

W. Harrer et al., "Influence of the Sample Size on the Results of B3B-Tests", Key Engineering Materials, Vol. 409, pp. 176-184, 2009

Online since:

March 2009

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$35.00

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