EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ASTM E837 testing. This standard specifies a hole drilling procedure for determining residual stress profiles near the surface of an isotropic linear elastic material.
The test method is applicable to residual stress profile determinations where in-plane stress gradients are small. Stresses may remain approximately constant with depth (“smooth” stresses) or vary significantly with depth (“uneven” stresses).
The measured workpiece can be "thin" with a thickness much less than the diameter of the drilled hole, or "thick" with a thickness much greater than the diameter of the drilled hole. For thin workpieces only uniform tension measurements are specified, while for thick workpieces both uniform and non-uniform tension measurements are specified.
The drilling method can identify in-plane residual stresses near the measured surface of the workpiece material. The method gives local measurements showing residual stresses within the boundaries of the drilled hole.
This test method is applicable where the material behavior is linear-elastic. Theoretically, it is possible for local yielding to occur due to the stress concentration around the drilled hole. Satisfactory measurement results can be obtained if the residual stresses do not exceed about 80% of the material yield stress for drilling in a "thick" material and about 50% of the material yield stress in a "thin" material.
The drilling method is often described as "semi-destructive" because the damage it causes is local and usually does not significantly affect the usefulness of the workpiece. In contrast, most other mechanical methods of measuring residual stresses greatly destroy the workpiece. Because drilling causes some damage, this test method should only be applied where the workpiece is expendable or where drilling a small shallow hole will not significantly affect the usefulness of the workpiece.
EUROLAB assists manufacturers with ASTM E837 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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