ASTM-E228 2011

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E228-11 Standard Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer

Published By	Publication Date	Number of Pages
ASTM	2011	10

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Description

ASTM E228-11

Historical Standard: Standard Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer

ASTM E228

Scope

1.1 This test method covers the determination of the linear thermal expansion of rigid solid materials using push-rod dilatometers. This method is applicable over any practical temperature range where a device can be constructed to satisfy the performance requirements set forth in this standard.

Note 1

Initially, this method was developed for vitreous silica dilatometers operating over a temperature range of -180 to 900°C. The concepts and principles have been amply documented in the literature to be equally applicable for operating at higher temperatures. The precision and bias of these systems is believed to be of the same order as that for silica systems up to 900°C. However, their precision and bias have not yet been established over the relevant total range of temperature due to the lack of well-characterized reference materials and the need for interlaboratory comparisons.

1.2 For this purpose, a rigid solid is defined as a material that, at test temperature and under the stresses imposed by instrumentation, has a negligible creep or elastic strain rate, or both, thus insignificantly affecting the precision of thermal-length change measurements. This includes, as examples, metals, ceramics, refractories, glasses, rocks and minerals, graphites, plastics, cements, cured mortars, woods, and a variety of composites.

1.3 The precision of this comparative test method is higher than that of other push-rod dilatometry techniques (for example, Test Method D 696) and thermomechanical analysis (for example, Test Method E 831) but is significantly lower than that of absolute methods such as interferometry (for example, Test Method E 289). It is generally applicable to materials having absolute linear expansion coefficients exceeding 0.5 m/(mC) for a 1000°C range, and under special circumstances can be used for lower expansion materials when special precautions are used to ensure that the produced expansion of the specimen falls within the capabilities of the measuring system. In such cases, a sufficiently long specimen was found to meet the specification.

1.4 Computer- or electronic-based instrumentation, techniques, and data analysis systems may be used in conjunction with this test method, as long as it is established that such a system strictly adheres to the principles and computational schemes set forth in this method. Users of the test method are expressly advised that all such instruments or techniques may not be equivalent and may omit or deviate from the methodology described hereunder. It is the responsibility of the user to determine the necessary equivalency prior to use.

1.5 SI units are the standard.

1.6 There is no ISO method equivalent to this standard.

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

contraction; dilatometer; dilatometry; expansion; expansivity; linear thermal expansion; mean coefficient of thermal expansion; push-rod

ICS Code

ICS Number Code 19.060 (Mechanical testing)

DOI: 10.1520/E0228-11

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Summary of Test Method Significance and Use
3	Interferences Apparatus FIG. 1 FIG. 2
4	Test Specimens
5	Calibration Procedure
6	Calculation Report Precision and Bias
7	Keywords X1. THERMAL EXPANSION OF SOME REFERENCE MATERIALS IN CURRENT GENERAL USE X1.1
8	TABLE X1.1 TABLE X1.2
9	REFERENCES TABLE X1.3

Additional information

Standard Title	E228-11 Standard Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
Published Code	ASTM
Publication Date	2011
Pages Count	10