FASTENER BEARING SPECIMEN
SUPPORT FIXTURE (ASTM D 5961)
Model No. CU-SF (low carbon steel)
Model No. WTF-SF (17-4PH stainless)
This specimen
support fixture, shown below, is used with Procedure B – Single
Shear, of ASTM D 5961 (Reference 1). The bearing strength of a 1.5”
wide test specimen assembly containing one or two ¼” diameter
fasteners is to be determined. ASTM Standard D 5961 also includes
Procedure A – Double Shear, which is described in Sections H-2
through H-4 of this catalog.
Assembled
Fastener Bearing Specimen Support Fixture
The test
specimen consists of two identical plates fastened together using
one or two centerline fasteners, with a doubler on each end to
minimize bending due to eccentricity of the applied force. The
support fixture can be used with either tensile or compressive
loading, to stabilize the fixture and further minimize bending
effects. Hydraulic wedge grips are used to grip the support fixture
at each end, just as discussed in Section C-1 of this catalog in
relation to the Boeing Open-Hole Compression Test Fixture, Models
CU-OH and WTF-OH (Reference 2). The machine-roughened outer
surfaces of the fixture are to aid gripping, can be seen in the
above photograph.
As shown in the
photograph below, the inside surfaces of the fixture are thermal
sprayed with tungsten carbide particles, to aid in gripping the
specimen ends.
Both the applied
force and the associated deformation of the holes(s) in the specimen
plates are monitored, to bearing failure of one or both specimen
plates.
Partially
Disassembled Fastener Bearing Specimen Support Fixture
Sources of
Additional Information:
1)
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