ASTM D6484 Open Hole Compressive Strength of Polymer Matrix Composite Laminates

composites tested to ASTM D6484

ASTM D6484 is a testing standard that measures the open-hole compressive strength of multidirectional polymer matrix composite laminates. Because mechanical fasteners such as rivets, pins, and bolts are commonly used to connect composite laminates, open-hole compressive testing is required in order to determine the ultimate compressive strength of the laminate, the ratio of the specimen across the hole to the diameter of the hole, and the percent bending. ASTM D6484 is relevant to the aerospace industry for the purposes of material specifications, research and development, quality assurance, and structural design and analysis.

Materials Testing System

ASTM D6484 should be run on a well-aligned electromechanical test system such as Instron's 6800 Series with grips and fixtures appropriate to which test procedure is being used. Operators also have the option of using edge-mounted extensometers to measure the displacement.

ASTM D6484 Test Setup
6800 Series
Bluehill Universal Software
2742-501 Advanced Hydraulic Wedge Grips
AVE2 Non-Contacting Extensometer
CP113779 Open-Hole Compression Fixture


ASTM D6484 test setup
Grips and Fixtures

There are two different procedures for testing to ASTM D6484. In procedure A, the laminate face is supported in a bolted test fixture. The ends of the fixture are clamped in hydraulic wedge grips, transmitting the force in shear. In Procedure B, compression platens are required to compress the specimen within the test fixture in end loading.

Instron Grips model number 2742-501
300 kN Capacity | 2742-501
Testing Tips and Tricks 
  • During panel fabrication it is critical to have good fiber alignment, since a misalignment could significantly reduce the compressive strength of the laminate.
  • When calculating the ultimate compressive strength of the laminate specimen, use the cross-sectional area of the test coupon without taking the hole into account.
  • To read the full test procedures for this standard, purchase ASTM D6484.
Related Content

6800 Series Premier Testing Systems Brochure

Instron 6800 Series Universal Testing Systems provide unparalleled accuracy and reliability. Built on a patent-pending Operator Protect system architecture with an all-new Smart-Close Air Kit and Collision Mitigation features, the 6800 Series makes materials testing simpler, smarter, and safer than ever before.

Composites Testing Brochure

Instron’s universal testing machines are designed to perform the most common types of testing used in the composites industry, including but not limited to in-plane tensile, through thickness tensile, interlaminar shear, compression in end, shear, or combined loading, and compression after impact.

Bluehill Universal Brochure

Bluehill Universal Software is built from the ground-up for touch interaction and an intuitive user experience. Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest in seconds, enhanced data exporting: and Instron Connect – a new feature that provides a direct communication link to Service. Users of previous versions of software such as Bluehill 2 and Bluehill 3 can easily upgrade to the newest version of Bluehill.

Open-Hole Compression Test Fixture ASTM D6484/D6484M

The ASTM D6484 / D6484M fixture is used to perform open-hole compressive tests on multi-directional polymer matrix composite laminates reinforced with high modulus fibers.

2743-401 Hydraulic Wedge Grips

Instron's 100 kN hydraulic wedge grips provide an innovative solution for high-capacity testing and delivery enhanced gripping performance, usability, and operator safety.