Procedure A in ASTM D , has the objective to test composite laminates double-edged. The pin in the device, creating two cutting plans, extracts a segment. ASTM D TESTING FIXTURE – PROCEDURE B. FASTENER BEARING SPECIMEN SUPPORT. Pdf icon button Download PDF. The bearing strength of a . Model No. ASTM.D – Double Shear Fastener Test Fixture. The Double Shear Fixture applies a double shear load via two loading plates secured to the.
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Procedure B is actually a specimen support fixture and is described in Section H-1 of this product catalog. The other three procedures are pin bearing fixtures, as will be described here. That is, the pin in the fixture attempts to shear out a segment of the composite laminate test specimen by creating two shear planes in the pin.
The standard test specimen axtm 5.
ASTM D5961 Polymer Matrix Composite Laminate Bearing Strength Test Equipment
The end of the fixture with the spacer in place is gripped in a standard tensile wedge grip. Each half of the fixture is 0. The free end of the specimen is held in a second tensile wedge grip. A tensile load is applied until a maximum loading has been reached, monitoring both applied force and hole deformation, as described in the ASTM standard.
ASTM D Double Shear Fixture for Bearing Composite Laminate | GDA
Sometimes the customer has a requirement to test non-standard specimen sizes, requiring Wyoming Test Fixtures, Inc. An alternate version of the test fixture shown in Figs. As described in Section H-2, the SACMA fixture is much easier to use aetm the specimen holder is one piece, with adjustable bushings to accommodate variations in specimen thickness.
That is, a single shear plane is developed in the loading pin as the tensile load is applied. The test fixture is shown in Fig. The specimen is placed on the right surface of the f5961 fixture, aligning the hole in the end of the specimen with the hole shown in the fixture and a fastener inserted and lightly torqued.
Or a pin can be used.
The flat tang at the top of the test fixture is gripped in a wedge grip and a tensile force is applied to the lower end of the specimen. The maximum force attained and the deformation of the hole in the aastm are recorded.
Procedure D of ASTM D loads the laminate bearing specimen in double shear through a close-tolerance, lightly torqued fastener or pin. The fixture is shown in Fig. The two lower components of the fixture are spread apart to permit inserting the 1. A pin or fastener is inserted in the hole, the fastener being torqued as desired. The upper end of the fixture is held in a grip, as is the lower end of the test specimen.
The specimen is kept short enough to avoid buckling. The applied compressive loading induces a double shear in both the specimen and the loading fastener or pin. Load at failure and hole deformation are measured. Sources of Additional Information:.
This simple test fixture is shown in Fig. The two halves of the fixture are separated by a spacer not provided of the same thickness as the specimen being tested.
ASTM D5961 Double Shear Fixture for Bearing Composite Laminate | GD5961-A
Obviously, a piece of the same test material can be used as a spacer, if desired. Since a raised boss is present at the pin hole, the opposite asttm of the fixture is thicker by an equal amount so that the specimen is uniformly supported when gripped. Sources of Additional Information: Wyoming Test Fixtures Inc.