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ASTM D5941-96

(Test Method)

Standard Test Method for Determination of Izod Impact Strength (Withdrawn 1998)

Standard Test Method for Determination of Izod Impact Strength (Withdrawn 1998)

General Information

Status
Withdrawn
Withdrawal Date
09-Apr-1998
ICS
83.080.01 - Plastics in general
Technical Committee
D20 - Plastics
Drafting Committee
D20.16 - Thermosetting Materials
Current Stage
Ref Project

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ASTM D5941-96 - Standard Test Method for Determination of Izod Impact Strength (Withdrawn 1998)ASTM D5941-96 - Standard Test Method for Determination of Izod Impact Strength (Withdrawn 1998)
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ASTM D5941-96 - Standard Test Method for Determination of Izod Impact Strength (Withdrawn 1998)
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 5941 – 96
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
1
Determining the Izod Impact Strength of Plastics
This standard is issued under the fixed designation D 5941; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope of the pendulum, its impact velocity, and the conditioning of
the specimens, can also influence the results. Consequently,
1.1 This test method covers a procedure for determining the
when comparative data are required, these factors must be
Izod impact strength of plastics under defined conditions. A
controlled and recorded carefully.
number of different types of specimen and test configurations
1.7 The procedure should not be used as a source of data for
are defined. Different test parameters are specified according to
design calculations of components. Information on the typical
the type of material, type of test specimen, and type of notch.
behavior of a material can be obtained, however, by testing at
1.2 The procedure is used for investigating the behavior of
different temperatures, by varying the notch radius or the
specified types of specimens under the impact conditions
thickness, or both, and by testing specimens prepared under
defined and for estimating the brittleness or toughness of
different conditions.
specimens within the limitations inherent in the test conditions.
1.8 This test method is identical to ISO 180. This test
1.3 The procedure is suitable for use with the following
method is comparable to Test Method D 256, but neither test
range of materials:
method should be substituted for the other. The two test
1.3.1 Rigid thermoplastics molding and extrusion materials,
methods may differ with respect to test specimen dimensions,
including filled and reinforced compounds in addition to
test specimen conditioning, test equipment, testing conditions,
unfilled types; rigid thermoplastics sheet;
etc. The two test methods may not give the same results.
1.3.2 Rigid thermosetting molding materials, including
1.9 The values stated in SI units are to be regarded as the
filled and reinforced compounds; rigid thermosetting sheet,
standard. The values given in parentheses are for information
including laminates;
only.
1.3.3 Fiber-reinforced thermoset and thermoplastics com-
1.10 This standard does not purport to address all of the
posites incorporating unidirectional or nonunidirectional rein-
safety concerns, if any, associated with its use. It is the
forcements such as mat, woven fabrics, woven rovings,
responsibility of the user of this standard to establish appro-
chopped strands, combination and hybrid reinforcements, rov-
priate safety and health practices and determine the applica-
ings and milled fibers; sheet made from pre-impregnated
bility of regulatory limitations prior to use.
materials (prepregs).
1.3.4 Thermotropic liquid-crystal polymers.
2. Referenced Documents
1.4 The procedure is not normally suitable for use with rigid
2.1 ASTM Standards:
cellular materials and sandwich structures containing cellular
D 256 Test Method for Determining the Pendulum Impact
material. Also, notched specimens are not normally used for
2
Resistance of Notched Specimens of Plastics
long-fiber-reinforced composites or for thermotropic liquid-
D 5936 Specification for Multipurpose Test Specimens
crystal polymers.
3
Used for Testing Plastics
1.5 The procedure is adapted to the use of specimens that
D 5939 Practice for Preparing Multipurpose Test Specimens
may be either molded to the chosen dimensions, machined
3
and Bars of Thermoplastics by Injection Moulding
from the central portion of a standard multipurpose test
D 5940 Practice for Preparing Small Plate Test Specimens
specimen (see ISO 3167 (Specification D 5936)), or machined
3
of Thermoplastics by Injection Moulding
from finished and semifinished products such as moldings,
4
2.2 ISO Standards:
laminates, and extruded or cast sheet.
ISO 180 Determination of Izod Impact Strength
1.6 The procedure specifies preferred dimensions for the
ISO 291:1977 Plastics—Standard Atmospheres for Condi-
test specimen. Tests that are conducted on specimens of
tioning and Testing
different dimensions and notches, or on specimens that are
ISO 293:1986 Plastics—Compression Moulding Test
prepared under different conditions, may produce results that
Specimens of Thermoplastic Materials
are not comparable. Other factors, such as the energy capacity
1 2
This test method is under the jurisdiction of ASTM Committee D-20
...

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5.1 The property KIc  (GIc) determined by these test methods characterizes the resistance of a material to fracture in a neutral environment in the presence of a sharp crack under severe tensile constraint, such that the state of stress near the crack front approaches plane strain, and the crack-tip plastic (or non-linear viscoelastic) region is small compared with the crack size and specimen dimensions in the constraint direction. A KIc value is believed to represent a lower limiting value of fracture toughness. This value has been used to estimate the relation between failure stress and defect size for a material in service wherein the conditions of high constraint described above would be expected. Background information concerning the basis for development of these test methods in terms of linear elastic fracture mechanics can be found in Refs  (1-5).3  
5.1.1 The KIc (GIc) value of a given material is a function of testing speed and temperature. Furthermore, cyclic loads have been found to cause crack extension at K values less than KIc (GIc). Crack extension under cyclic or sustained load will be increased by the presence of an aggressive environment. Therefore, application of KIc (GIc) in the design of service components should be made considering differences that may exist between laboratory tests and field conditions.  
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1.7 This protocol covers the determination of GIc as well, which is of particular importance for plastics.  
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1.9 Test data obtained by these test methods are relevant and appropriate for use in engineering design.  
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Standard Terminology Relating to Plastics

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1.1 This terminology covers definitions of technical terms used in the plastics industry. Terms that are generally understood or adequately defined in other readily available sources are not included.  
1.2 When a term is used in an ASTM document for which Committee D20 is responsible it is included only when judged, after review, by Subcommittee D20.92 to be a generally usable term.  
1.3 Definitions that are identical to those published by another standards body are identified with the abbreviation of the name of the organization; for example, IUPAC is the International Union of Pure and Applied Chemistry.  
1.4 A definition is a single sentence with additional information included in discussion notes. It is reviewed every 5 years; the year of last review is appended.  
1.5 For literature related to plastics terminology, see Appendix X1.  
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