UTM-HZ-N010 Fastener Testing Fastener Bearing Specimen Support Fixtures (ASTM D5961, procedure B)

UTM-HZ-N010Fastener Testing Fastener Bearing Specimen Support Fixtures (ASTM D5961, procedure B) Mechanically fastened joints are often used in structures, including composite structures, to transfer load from one component to another. The load is primarily transferred by bearing (contact) forces that develop between the fastener and the side of the hole in the structure, however testing is performed to assess the resistance of a material to other fastener-induced types of failure as well. In this section test fixtures used when performing standardized fastener tests are listed.Contact number: +86 13711888650

Fastener Testing Fastener Bearing Specimen Support Fixture (ASTM D5961, procedure B)

Fig. 1: Partially disassembled Fastener Bearing Specimen Support Fixture

The specimen support fixture shown in Fig. 1 is used with Procedure B – Single Shear, of ASTM D5961 (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 D5961 also includes Procedure A – Double Shear, Procedure C - Single Shear, and Procedure D - Double Shear-Compression Loading, which are described on a separate page.

The test specimen for Procedure B 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. This 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 relation to the Boeing Open-Hole Compression Test Fixture, Model WTF-OH (Reference 2). Tungsten carbide particle specimen gripping surfaces, as can be seen in the opened half of the fixture at the left side of Fig. 1, are used to transfer the applied load from the grips into the specimen.

Both the applied force and the associated deformation of the holes in the specimen plates are monitored, to bearing failure of one or both specimen plates.

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UTM-HZ-N010 Fastener Testing Fastener Bearing Specimen Support Fixtures (ASTM D5961, procedure B)

Fastener Testing Fastener Bearing Specimen Support Fixture (ASTM D5961, procedure B)

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UTM-HZ-N010 Fastener Testing Fastener Bearing Specimen Support Fixtures (ASTM D5961, procedure B)

Fastener Testing Fastener Bearing Specimen Support Fixture (ASTM D5961, procedure B)

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