Design and Testing
Shear test methods: Iosipescu vs. V-Notched Rail
Dr. Don Adams asks and suggests a likely answer to the question Which shear test method is best?
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A comparison of shear test methods
Dr. Don Adams compares the shear test methods that are currently available to the composite industry.
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V-Notch Rail Shear test (ASTM D 7078-05)
Dr. Don Adams introduces HPC readers to the The V-Notched Rail shear test method, approved as ASTM Standard D 7078-05 by ASTM Committee D-30 in March of 2005.
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Direct measurement of laminate through-thickness tensile strength
Although there are indirect methods for determining the through-thickness tensile strength of a solid laminate direct loading can be achieved, using ASTM test methods.
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Mixed-mode fracture toughness of composites
During the 1970s, fracture toughness testing of composite materials developed a very poor reputation, primarily due to failed attempts to directly adopt metals theory and corresponding test methods. However, the basic principles of fracture mechanics remained valid.
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Compression platens and subpresses
Dr. Don Adams discusses the use of compression platens (fixed and spherical seat) and subpresses to ensure reliable test frame operation.
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Neat resin specimen fabrication aids
To obtain quality experimental data, one must have access to quality test specimens.
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Fastener pull-through strength test method
Mechanical fasteners have been used to join wood and metal plates for hundreds of years.
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Mechanical wedge grips for tensile testing
In tensile testing, wedge grips are used on both ends of the specimen to position the specimen in the test frame.
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Through-the-thickenss tensile strength testing using a curved beam
The in-plane strength properties of a composite material, axial and transverse tension and compression and in-plane shear, are usually the first to be considered in design. However, through-the-thickness (interlaminar) strength properties cannot be ignored. Through-the-thickness tensile strength, in particular, can be critical to structural performance.
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