ASTM-E837 2008

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E837-08 Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method

Published By	Publication Date	Number of Pages
ASTM	2008	17

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Categories: 77.040.10 - Mechanical testing of metals, ASTM

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Description

1.1 Residual Stress Determination :

1.1.1 This test method specifies a hole-drilling procedure for determining residual stress profiles near the surface of an isotropic linearly elastic material. The test method is applicable to residual stress profile determinations where in-plane stress gradients are small. The stresses may remain approximately constant with depth ( uniform stresses) or they may vary significantly with depth ( non-uniform stresses). The measured workpiece may be thin with thickness much less than the diameter of the drilled hole or thick with thickness much greater than the diameter of the drilled hole. Only uniform stress measurements are specified for thin workpieces, while both uniform and non-uniform stress measurements are specified for thick workpieces.

1.2 Stress Measurement Range :

1.2.1 The hole-drilling method can identify in-plane residual stresses near the measured surface of the workpiece material. The method gives localized measurements that indicate the residual stresses within the boundaries of the drilled hole.

1.2.2 This test method applies in cases where material behavior is linear-elastic. In theory, it is possible for local yielding to occur due to the stress concentration around the drilled hole, for isotropic (equi-biaxial) residual stresses exceeding 50 % of the yield stress, or for shear stresses in any direction exceeding 25 % of the yield stress. However, in practice it is found that satisfactory results can be achieved providing the residual stresses do not exceed about 60 % of the material yield stress.

1.3 Workpiece Damage :

1.3.1 The hole-drilling method is often described as semi-destructive because the damage that it causes is localized and often does not significantly affect the usefulness of the workpiece. In contrast, most other mechanical methods for measuring residual stresses substantially destroy the workpiece. Since hole drilling does cause some damage, this test method should be applied only in those cases either where the workpiece is expendable, or where the introduction of a small shallow hole will not significantly affect the usefulness of the workpiece.

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.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Method FIG. 1
3	FIG. 2 FIG. 3
4	Significance and Use Workpiece Preparation Strain Gages and Instrumentation FIG. 4
5	Procedure TABLE 1 FIG. 5
6	TABLE 2
7	Computation of Uniform Stresses
8	TABLE 3 TABLE 4
9	FIG. 6
10	Computation of Non-Uniform Stresses
11	TABLE 5
12	Report Precision and Bias
13	TABLE 6
15	TABLE 7
16	Keywords
17	REFERENCES

Additional information

Standard Title	E837-08 Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method
Published Code	ASTM
Publication Date	2008
Pages Count	17
ICS Codes	77.040.10 - Mechanical testing of metals

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ASTM-E837 2008

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