ASTM C158-02(2007)

Standard Test Methods for Strength of Glass by Flexure (Determination of Modulus of Rupture)

SCOPE
1.1 These test methods cover the determination of the modulus of rupture in bending of glass and glass-ceramics.
1.2 These test methods are applicable to annealed and prestressed glasses and glass-ceramics available in varied forms. Alternative test methods are described; the test method used shall be determined by the purpose of the test and geometric characteristics of specimens representative of the material.
1.2.1 Test Method A is a test for modulus of rupture of flat glass.
1.2.2 Test Method B is a comparative test for modulus of rupture of glass and glass-ceramics.
1.3 The test methods appear in the following order:Sections Test Method A6 to 9 Test Method B10 to 5
1.4 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. Specific hazard statements are given in Section 10 and A1.5, A2.3.3, A2.4.3 and A2.5.3.

General Information

• Status: Historical
• Publication Date: 31-Mar-2007
• ICS: 81.040.10 - Raw materials and raw glass
• Technical Committee: C14 - Glass and Glass Products
• Drafting Committee: C14.04 - Physical and Mechanical Properties

Relations

• Replaces: ASTM C158-02 - Standard Test Methods for Strength of Glass by Flexure (Determination of Modulus of Rupture)
• Effective Date: 01-Apr-2007
• Replaced By: ASTM C158-02(2012) - Standard Test Methods for Strength of Glass by Flexure (Determination of Modulus of Rupture)
• Effective Date: 01-Oct-2012
• Referred By: ASTM C1279-13(2019) - Standard Test Method for Non-Destructive Photoelastic Measurement of Edge and Surface Stresses in Annealed, Heat-Strengthened, and Fully Tempered Flat Glass
• Effective Date: 01-Apr-2007
• Referred By: ASTM F1538-03(2017) - Standard Specification for Glass and Glass Ceramic Biomaterials for Implantation
• Effective Date: 01-Apr-2007
• Referred By: ASTM F561-19 - Standard Practice for Retrieval and Analysis of Medical Devices, and Associated Tissues and Fluids
• Effective Date: 01-Apr-2007
• Referred By: ASTM C1684-18(2023) - Standard Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature—Cylindrical Rod Strength
• Effective Date: 01-Apr-2007

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C158 − 02(Reapproved 2007)
Standard Test Methods for
Strength of Glass by Flexure (Determination of Modulus of
1
Rupture)
This standard is issued under the fixed designation C158; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope SI10-02IEEE/ASTMSI10 AmericanNationalStandardfor
UseoftheInternationalSystemofUnits(SI):TheModern
1.1 These test methods cover the determination of the
Metric System
modulus of rupture in bending of glass and glass-ceramics.
1.2 These test methods are applicable to annealed and
3. Terminology
prestressed glasses and glass-ceramics available in varied
3.1 Definitions:
forms.Alternative test methods are described; the test method
3.1.1 glass-ceramics—solid materials, predominantly crys-
used shall be determined by the purpose of the test and
talline in nature, formed by the controlled crystallization of
geometric characteristics of specimens representative of the
glasses.
material.
3.1.2 modulus of rupture in bending—the value of maxi-
1.2.1 Test Method A is a test for modulus of rupture of flat
mum tensile or compressive stress (whichever causes failure)
glass.
in the extreme fiber of a beam loaded to failure in bending
1.2.2 Test Method B is a comparative test for modulus of
computed from the flexure formula:
rupture of glass and glass-ceramics.
Mc
1.3 The test methods appear in the following order:
S 5 (1)
b
I
Sections
Test Method A 6 to 9
where:
Test Method B 10 to 15
M = maximum bending moment, computed from the maxi-
1.4 This standard does not purport to address all of the
mum load and the original moment arm,
safety concerns, if any, associated with its use. It is the
c = initial distance from the neutral axis to the extreme
responsibility of the user of this standard to establish appro-
fiber where failure occurs, and
priate safety and health practices and determine the applica-
I = initial moment of inertia of the cross section about the
bility of regulatory limitations prior to use. Specific hazard
neutral axis.
statements are given in Section 10 and A1.5, A2.3.3, A2.4.3
3.1.3 prestressed—material in which a significant and con-
and A2.5.3.
trolled degree of compressive stress has been deliberately
produced in the surfaces.
2. Referenced Documents
2
3.1.4 standard laboratory atmosphere—an atmosphere hav-
2.1 ASTM Standards:
ingatemperatureof23 62°Candarelativehumidityof40 6
C148Test Methods for Polariscopic Examination of Glass
10%.
Containers
E4Practices for Force Verification of Testing Machines 3.2 Definitions of Terms Specific to This Standard:
3.2.1 abraded—describes a test specimen that has at least a
portionoftheareaofmaximumsurfacetensilestresssubjected
to an operationally defined procedure for mechanical abrasion.
1
These test methods are under the jurisdiction of ASTM Committee C14 on
The severity and uniformity of abrasion should be sufficient to
Glass and Glass Products and are the direct responsibility of Subcommittee C14.04
on Physical and Mechanical Properties.
ensureoriginoffailuresubstantiallyintheregionofmaximum
Current edition approved April 1, 2007. Published May 2007. Originally
stress.
approved in 1940. Last previous edition approved in 2002 as C158–02. DOI:
10.1520/C0158-02R07.
3.2.2 annealed glass—describes a specimen that shall not
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
have a temper or degree of residual stress resulting from prior
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
thermal treatment in excess of the following limits when
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. measured polarimetrically (see Annex A1):
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C158 − 02 (2007)
3.2.2.1 Specimens of rectangular section shall not have a The use of a controlled abrasion of the specimen as a final
tensile stress at the midplane of more than 1.38-MPa (200-psi) normalizing procedure is recommended for such comparative
nor more than 2.76-MPa (400-psi) compression at the surface. tests.
3.2.2.2 Specimensinrodformmaybeexaminedbyviewing
4.6 A comparative abraded strength, determined as sug-
through a diameter at least four diameters from an end. The
gestedinTestMethodB,isnottobeconsideredasaminimum
apparent central axial tension shall not exceed 0.92 MPa (133
valuecharacteristicofthematerialtestednorasdirectlyrelated
psi
...