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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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.

Procedures A and D, the double-shear configurations, with a single fastener loaded in shear and reacted by laminate tension or compression, are particularly recommended for basic material evaluation and comparison. 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.

The Procedure B specimen may be tested in either an unstabilized no support fixture or stabilized configuration.

The unstabilized configuration is intended for tensile aatm and the stabilized configuration is intended for compressive loading although tensile loading is permitted. 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.


ASTM D Double Shear Fixture for Bearing Composite Laminate | GDA

These Procedure B and C configurations have been extensively used in the development of design allowables data. 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.

For protruding head fasteners, Procedure D will typically yield somewhat higher results than Procedure C due to both stress peaking and finite edge distance in Procedure Cand Procedures A and C yield roughly equivalent results. 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:. Standard specimen configurations using fixed values of test parameters are described for each procedure. However, when fully documented in the test report, a number of test parameters may be optionally varied.

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 range of sstm test laminates and thicknesses are described in 8.


Note that the scope of this test method is limited to bearing and fastener failure modes. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently d5691 the other. Combining values from the two systems may result in non-conformance with the standard.


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. Properties, in the test direction, which may be obtained from this test method include the following: Link to Active This link will always route to the current Active version of the standard.