ASTM D5961 - Bearing Response of Polymer Matrix Composite Laminates
ASTM D5961 is a testing standard that covers the bearing response of pinned or fastened joints of composite laminates. Connecting individual composite components with rivets or fastener is a common solution for connection of parts in the aerospace industry. ASTM D5961 is used by material designers to determine material specifications for research and development, quality assurance, and structural design analysis.
Test Methods
ASTM D5961 includes four different testing procedures: A, B, C, and D. Procedure A is designed for double-shear tensile loading on a single piece specimen. Procedure B is for single-shear tensile or compressive loading on a two piece specimen. Procedure C is for single shear tensile loading of a single piece specimen, and Procedure D is for double-shear compressive loading on a single piece coupon. The composite coupons are supposed to be balanced and symmetric with respect to their test direction.
It is important to note that these four testing procedures will give results that are not directly comparable. Due to the larger fastener rotation and higher peak bearing stress Procedure C will yield higher strengths than Procedure B. For protruding head fasteners Procedure D will most likely yield higher bearing results than Procedure C. Procedures A and C produce very similar results.
Materials Testing System
ASTM D5961 testing is best performed on a high capacity system such as Instron's 100kN 6800 Series floor model equipped with either precision manual (2716-028/030) or hydraulic (2743-401)wedge grips for gripping the loading plates. This standard requires different loading tools for each procedure, usually involving loading plates, pins, and/or fasteners. A set of grips is needed to grip the loading plates.
For more information, download ASTM D5961
| ASTM D5961 Test Setup | |
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6800 Series universal testing system |
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Bluehill Universal software |
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2580 Series load cell |
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2743 Series hydraulic wedge grip |
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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.
High Force Universal Testing Machines Brochure
Instron’s high force systems include electromechanical and high-capacity hydraulic testing systems for tension and compression applications. Force capacities range from 100 kN to 2000kN.
Precision Manual Wedge Grips | 2716-028 / 2716-030
Instron 2716-028 / 2716-030 Series Precision Manual Wedge Grips provide reliable gripping for a vast range of materials, as well as repeatable alignment that meets Nadcap requirements.
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.
Bluehill Universal Brochure
Bluehill Universal is Instron’s advanced materials testing software, designed for intuitive touch interaction and streamlined workflows. It offers pre-loaded test methods, QuickTest for rapid setup, enhanced data exporting, and Instron Connect for direct service communication. Users of Bluehill 2 and Bluehill 3 can easily upgrade to the latest version for improved performance and usability
