Scope:

ASTM F417 determines flexural strength or modulus of rupture of electronic grade ceramics. Modulus of Rupture is a measure of a specimen’s strength before rupture. The data is used by manufacturers in the quality control and selection process of Electronic-Grade Ceramics.

Test Procedure:

In ASTM F417, the two most common types of flexure tests are employed – three-point and four-point flexural bending tests. The three-point bend test consists of the sample placed horizontally upon two points and the force applied to the top of the sample through a single point so that the sample is bent in the shape of a “V”. 

A four-point bend test is roughly the same except that instead of the force applied through a single point on top it is applied through two points so that the sample experiences contact at four different points and is bent more in the shape of a “U”. 

In the ASTM F417 testing method, the three-point flexure test is ideal for the testing of a specific location of the sample, whereas, the four-point flexure test is more suited towards the testing of a large section of the sample, which highlights the defects of the sample better than a 3-point bending test.

 Specimen size:

ASTM F417 test method applies to specimens prepared from ceramic blanks with dimensions of at least 0.080 by 0.080 by 1 1/8 in. (2.0 by 2.0 by 28.6 mm).

Data: 

Modulus of rupture calculation for ASTM F417

1. For circular specimen: 

  M = 8PL/πd³

2. For rectangular specimen: 

M = 3 PL/2bd²

Where: 

M = modulus of rupture

P = load at rupture

L = distance between supports

d = diameter of specimen

Conclusion:

ASTM F417 is used to determine the Modulus of Rupture or flexural strength of Electronic-Grade Ceramics by flexural bending tests.