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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Sources of Additional Information: 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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The two halves of the fixture are separated by a spacer not provided of the same thickness as the specimen being tested.
Sometimes the customer has a requirement to test non-standard specimen sizes, requiring Wyoming Test Fixtures, Inc. 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. The upper end of the fixture is held in a grip, as is the lower end of the test specimen. The standard test specimen is 5.
Procedures B and C, the single-shear, single- or double-fastener configurations are more useful in evaluation of specific joint configurations, including fastener failure modes. Note that the scope of this test method is limited to bearing and fastener failure modes. These Procedure B and C configurations have been extensively used in the development of asfm allowables data.
However, when fully documented in the test report, a number of test parameters may be optionally varied. We offer machines, apparatus, testers, tensile grips, test fixtures, clamps, holders, jigs, faces, jaws, extensometers, environmental and humidity chambers, furnaces, baths and custom solutions for unique applications.
The standard configuration for each procedure is very specific and is intended primarily for development of quantitative double- and single-shear bearing response data for material comparison and structural design.
The Procedure B specimen may be tested in either an unstabilized no support fixture or stabilized configuration. Load at failure and hole deformation are measured. Link to Active This link will always route to the current Active version of the standard. The Procedure C specimen is particularly well-suited for development of countersunk-fastener bearing strength data where a near-double-shear fastener rotational stiffness is desired.
This simple test fixture is shown in Fig. The composite material forms are limited to continuous-fiber or discontinuous-fiber tape or fabric, or both reinforced composites for which the laminate is balanced and symmetric with respect to the test direction. The composite material forms are limited to continuous-fiber or discontinuous-fiber tape or fabric, or both reinforced composites for which the laminate is balanced and symmetric with respect to the test direction.
ASTM D 5961 TESTING FIXTURE – PROCEDURE B
A pin or fastener is inserted in the hole, the fastener being torqued as desired. The test fixture is shown in Fig. Standard specimen configurations using fixed values of test parameters are described for each procedure. A is double-shear tensile loading, B is single-shear tensile or compressive loading of a two-piece specimen, C is single-shear tensile loading of a one-piece specimen, and D is double-shear compressive asrm.
The properties obtained from this testing standard are the ultimate bearing strength, the offset bearing strength and the stress-strain curve.
Procedure D d596 ASTM D loads the laminate bearing specimen in double shear through a close-tolerance, lightly torqued fastener or pin. The maximum force attained and the deformation of the hole in the specimen are recorded. The range of acceptable test laminates and thicknesses are described in 8.
Typically, Procedure D will yield slightly higher strengths than Procedure A due to the finite edge distance, ein Procedure A ; while Procedure C will yield significantly higher strengths than Procedure B due to the larger fastener rotation and higher peak bearing stress in Procedure B.
Sources of Additional Information:. Give one of our application engineers a call today for help with creating the best budget and testing plan according to ASTM D Since a raised boss is present at the pin hole, the opposite end of the fixture is thicker by an equal amount so that the specimen is uniformly supported when gripped.
Link to Active This link will always route to the dd5961 Active version of the standard.
ASTM D TESTING FIXTURE – PROCEDURE B
Combining values from the two systems may result in non-conformance with the standard. Wyoming Test Fixtures Inc.
Obviously, a piece of the same test material can be used as a spacer, if desired. Each half of the fixture is 0. However, the flexibility of test parameters allowed by these variations makes meaningful comparison between datasets difficult if the datasets were not tested using the same procedure and identical test parameters. Properties, in the test direction, which may be obtained from this test method include the following: The specimen is kept short enough to avoid buckling.
Testing Procedure The test methods are as follows. As described in Section H-2, the SACMA fixture is much easier to use since the specimen holder is one piece, with adjustable bushings to accommodate variations in specimen thickness.
The specimen is placed on the right surface of the test fixture, aligning the hole in the end of the specimen with d59611 hole shown in the fixture and a fastener inserted and lightly torqued. 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.
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