MaTestLab > Test Standards > ASTM D6742 Practice for Filled-Hole Tension and Compression Testing of Polymer Matrix

ASTM D6742 Practice for Filled-Hole Tension and Compression Testing of Polymer Matrix

ASTM D6742 describes procedures to adapt open-hole tension and compression test methods in order to determine filled-hole tensile and compressive strengths. ASTM D6742 is analogous to open-hole testing, and the sample is tested only when a fastener is in the hole. Test materials usually tolerate a higher force during filled hole testing. Fastener selection, material hardness, fastener hole tolerance, torque, and clearance of the hole are the various parameters that might affect the strength properties of the material.

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Introduction to ASTM D6742

The specimen preparation, testing techniques, and data analysis methodologies for filled-hole tension and compression testing are outlined in ASTM D6742. The objective of ASTM D6742 is to enable consistent and reliable testing of composite laminates with filled holes, which are extensively applied in aerospace and structural applications. The standard focuses on polymer matrix composite laminates and includes guidelines for assessing the mechanical properties near the filled holes.

ASTM D6742 Test Procedure

ASTM D6742 provides information on the mechanical properties and performance of polymer matrix composite laminates as follows:

Specimen positioning and Load ApplicationTest specimens are conditioned to the specified surroundings before being placed in the grips or fixtures of the testing machine and subjected to a progressively increasing load until failure for the tension test or the appropriate load level for the compression test.
Displacement MonitoringLoad and displacement data are monitored and recorded using appropriate instrumentation and a data acquisition system; the testing procedure is repeated for the desired number of specimens; statistical significance and reliable average results are ensured.

ASTM D6742 Test Specimen

Specimen detailsThe test specimen for ASTM D6742 is a composite laminate with filled holes, which are representative of the holes commonly encountered in aerospace and structural applications.
Specimen dimensionsThe dimensions of the sample used in ASTM D6742 vary based on the application and the composite material being evaluated.
Specimen preparationThe test specimen is prepared and filled according to the standard, using appropriate techniques to simulate the conditions encountered in practical applications.

ASTM D6742 Test Results

ASTM D6742 tests the strength and behavior of composite laminates by subjecting specimens to controlled loads to evaluate their mechanical properties near filled holes. When testing a composite laminate, it is important to examine the laminate’s tensile strength, compressive strength, modulus of elasticity, strain at failure, and failure mechanism. Compressive strength, or the maximum load or stress at which the specimen fails in compression, tensile strength, or failure mode are all terms used to describe the way a specimen fails.

Tests Related to ASTM D6742

ASTM D6742 is related to other standards such as ASTM D3039 for tensile properties of polymer matrix composite materials and ASTM D3410 for compressive properties of polymer matrix composite materials with unsupported gage section by shear loading.

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Where can I get the astm d6742 tested?

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