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ASTM C 1495 Document Information:
Title
Standard Test Method for Effect of Surface Grinding on Flexure Strength of Advanced Ceramics
ASTM International
Publication Date:
Feb 1, 2007
Scope:
This test method covers the determination of the effect of
surface grinding on the flexure strength of advanced ceramics.
Surface grinding of an advanced ceramic material can introduce
microcracks and other changes in the near surface layer, generally
referred to as damage (See Fig. 1). Such damage can result in a
change—most often a decrease—in flexure strength of the material.
The degree of change in flexure strength is determined by both the
grinding process and the response characteristics of the specific
ceramic material. This method compares the flexure strength of an
advanced ceramic material after application of a user-specified
surface grinding process with the baseline flexure strength of the
same material. The baseline flexure strength is obtained after
application of a surface grinding process specified in this
standard. The baseline flexure strength is expected to approximate
closely the inherent strength of the material. The flexure strength
is measured by means of ASTM standard flexure test methods.
Flexure test methods used to determine the effect of surface
grinding are C 1161 Test Method for Flexure Strength of Advanced
Ceramics at Ambient Temperatures and C 1211 Test Method for Flexure
Strength of Advanced Ceramics at Elevated Temperatures.
Materials covered in this standard are those advanced ceramics
that meet criteria specified in flexure testing standards C 1161
and C 1211.
The flexure test methods supporting this standard (C 1161 and C
1211) require specimens that have a rectangular cross section, flat
surfaces, and that are fabricated with specific dimensions and
tolerances. Only grinding processes that are capable of generating
the specified flat surfaces, i.e. planar grinding modes, are
suitable for evaluation by this method. Among the applicable
machine types are horizontal and vertical spindle reciprocating
surface grinders, horizontal and vertical spindle rotary surface
grinders, double disk grinders, and tool-and-cutter grinders.
Incremental cross-feed, plunge, and creep-feed grinding methods may
be used.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- surface grinding
- machining
- advanced ceramic
- flexure strength
- baseline flexure strength
- damage tolerance
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