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ASTM C393_Standard Test Method for Shear Strength

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titleTest Specimen and Geometry

  • Specimen has rectangular in cross-section

  • Length x Width x Depth - 200 mm x 75 mm x Thickness of Sandwich Construction

  • Make sure to test at least five specimens per test condition unless you are confident that the results obtained are valid through the use of fewer specimens.

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titleEquipment and Apparatus:

  •  Equipment: ball-interfaced and anvil interface micrometer, deflectometer, conditioning chamber, environmental test chamber are recommended but not required.

  • Apparatus: The machine will have a stationary and movable head, the machine should be able to indicate the total force being carried by the test specimen, it will either be a 3- or 4-point bend test. Below is what they used

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titleProcedure:

  • Test at least five specimens.

  • Condition the specimen in a chamber if the test environment is not the same as a conditioned environment.

  •   Measure the length, width and thickness at three places in the specimen.

  • Place the specimeninto the test fixture and align the fixture so the longitudinal axis of the specimen is perpendicular (within 1 degree) to the longitudinal axes of the loading bars, the bars must also be parallel (within 1 degree) to the plane of the specimen facings.

  •  Attach the deflection transducer.

  • Apply a compressive force to the specimen until failure or until a deflection equal to the thickness is reached.

  • It was noted that the speed of testing should be around 6mm/min. 

  • Failure should occur at 3-6 minutes.

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ASTM D3039_Standard Test Methods for Tensile Properties

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titleTest Specimen and Geometry:
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titleEquipment and Apparatus:

  • 3 Force Indicator, Grips, Strain-Indicating Device, Strain transducer, Extensometer, Strain Gauge, End Tabs. 

  • Tensile Testing machine with a stationary head and a movable head. 

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titleProcedure:

  • Test at least 5 specimens

  • Measure the specimen in 3 places and report average thickness and width as well as average area. 

  • The speed of testing should be able to have a nearly constant strain rate and it will produce failure within 1 to 10 min. 

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 ASTM D3410_Standard Test Method for Compressive Properties of Polymer Matric Composite Materials

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titleGeometry:Test Specimen and Geometry

  • Sampling—Test at least five specimens per test condition unless valid results can be gained through the use of fewer specimens

  • The test specimen will have a constant rectangular cross section with a specimen width variation of no more than 1% and a specimen thickness variation of no more than 2%, the tables below give more detail.

  • Below is an equation to get the recommended test thickness

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titleEquipment and Apparatus:

  • Equipment required:

    • Micrometers/calipers

    • Strain-Indicating Device

    • Bonded Resistance Strain Gauges

    • Emery cloth

    • Special Alignment Jig (pictured below)

  • Compression Testing Fixture(pictured below are schematics and the actual fixture)

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  • Apparatus:

    • There will be a force indicator

    • The machine will have two loading heads. 

^^^I don’t exactly know what this means (interpret pls)

  • The drive mechanism will be able to give a controlled displacement rate with respect to the stationary head. 

  • If the atmosphere conditions suck use a conditioning chamber and an environmental test chamber.

  • If the material is super stiff use an extensometer. 

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titleGeometry:

  • Will be the same as the above standard along with the following:

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titleEquipment and Apparatus:

  • Same as the above standard.

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ASTM D903_Standard Test Method for Peel or Stripping Strength of Adhesive Bonds

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titleTest Specimen and Geometry:

  •   The above is the diagram of the geometry

  • Test at least 10 test specimens for each adhesive.

  • Discard specimens that give out of line test results due to obvious flaws and then retest.

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titleEquipment and Apparatus:

  • Apart from the testing apparatus, the only equipment needed is a conditioning room/desiccators

  • The following is a picture of the testing apparatus:

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