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ASTM G 39 Document Information:
Title
Standard Practice for Preparation and Use of Bent-Beam Stress-Corrosion Test Specimens
ASTM International
Publication Date:
Jan 10, 1999
Scope:
This practice covers procedures for designing, preparing, and using
bent-beam stress-corrosion
specimens.
Different specimen configurations are given for use with different
product forms, such as sheet or
plate. This practice applicable to specimens of any metal that are
stressed to levels less than the
elastic limit of the material, and therefore, the applied stress can
be accurately calculated or
measured (see Note 1). Stress calculations by this practice are not
applicable to plastically
stressed specimens.
NOTE 1 - It is the nature of these practices that only the applied
stress can be calculated. Since
stress-corrosion cracking is a function of the total stress, for
critical applications and proper
interpretation of results, the residual stress (before applying
external stress) or the total
elastic stress (after applying external stress) should be determined
by appropriate nondestructive
methods, such as X-ray diffraction (1).(Footnote 2)
Test procedures are given for stress-corrosion testing by exposure to
gaseous and liquid
environments.
The bent-beam test is best suited for flat product forms, such as
sheet, strip, and plate. For
plate material the bent-beam specimen is more difficult to use because
more rugged specimen holders
must be built to accommodate the specimens. A double-beam modification
of a four-point loaded
specimen to utilize heavier materials is described in 10.5.
The exposure of specimens in a corrosive environment is treated only
briefly since other practices
deal with this aspect, for example, Specification D 1141, and
Practices G 30, G 36, G 44, G 50, and
G 85. The experimenter is referred to ASTM Special Technical
Publication 425 (2).
The bent-beam practice generally constitutes a constant strain
(deflection) test. Once cracking has
initiated, the state of stress at the tip of the crack as well as in
uncracked areas has changed,
and therefore, the known or calculated stress or strain values
discussed in this practice apply
only to the state of stress existing before initiation of cracks.
The values stated in SI units are to be regarded as standard. The
inch-pound equivalents in
parentheses are provided for information.
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. (For more
specific safety hazard information see Section 7 and 12.1.)
Footnote 2 - The boldface numbers in parentheses refer to the list of
references appended to this
practice.
Keywords:
- bent-beam
- constant deformation
- constant load
- elastic strain
- quantitative stress
- stress-corrosion cracking
- stress-corrosion test specimen
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