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ASTM Testing Standards

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titleBasic Description:

  • 3-point or 4-point bend test

Figure 3: 3-Point Bend Test

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Figure 4: 4-Point Bend Test

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titleReported during the test:

  • Force versus crosshead displacement, force versus deflection data continuously, or at frequent intervals (around 2-3 recordings per second, with a target minimum of 100 recorded data points)

  • If there are any initial failures, record force, displacement and mode of damage where the failure occurs. 

  • Record mode, area and location of each failure. 

  • Use the failure identification codes, shown in the figure below.

  • Record the max force, failure force, head displacement and the deflection at the moment of ultimate failure. 

  • For ultimate failure modes, record the mode, area and location of ultimate failure for each material. 

  • Calculations:

    • For 3-Point Mid-Span Loading:

    • For 4-Point, Quarter-point loading:

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    • For 4-Point (Third Point) Loading:

ASTM D3039_Standard Test Methods for Tensile Properties

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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 I believe that we can use a UTM but I’m not 100% sure about it.

  • A picture of the testing apparatus is shown in the figure below:

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Figure 1: 90-degree peel tester

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Figure 2: UTM I think but, this setup is a vertical peel test.

  • Hehe…remember this…yeah it still makes no sense :C

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titleProcedure:

  • Prep the specimen.

  • Precondition the test specimen.

  • Test the specimen as soon as possible after conditioning

  • Place the specimen in the test apparatus

  • Wait until failure

Variable

Quantity

Grip Separation

About 1 Inch

Stripping angle

180 degrees.

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titleBasic Description:

  • Pendulum testing apparatusPeel Test, which is very similar to a tensile test (in my opinion). A video of this test being carried out is shown below.

https://www.youtube.com/watch?v=m6Rd6I-XMMg

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titleReported during test:
These are the only values needed to be reported (they don’t seem like they’re calculations)

Note that none of these variables have symbols/formulas.

Variable

Average peel/stripping strength

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Max and Min strength values of the series

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Type of

failure.

failire

ASTM D905_Standard Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading (for adhesives on wood)

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titleEquipment and Apparatus:

  • No equipment listed, just apparatus:

    • The machine will have a capacity of no less than 6810kg in compression and shall be fitted with a shearing tool containing a self-aligning seat to ensure uniform lateral distribution of the load.

    • It will be able to maintain a uniform rate of loading so the load may be applied with a continuous motion. The apparatus is pictured below:

Testing apparatus shown in figure 1, below.

  • We will have to prep the test joints:

    • They will be hard maple blocks, having a minimum specific gravity of 0.65 based on oven-dry weight and volume shall be selected. Below is a picture of the test joints and how they should be cut?

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titleProcedure:

  • Prepare the test specimens.

  • Place the test specimen in the apparatus.

  • Apply a load onto the test specimens until failure occurs.

Variable

Quantity

Load Rate

5 mm/min

Specific Gravity of maple blocks

0.65

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titleBasic Description:

  • Shearing tool/shearing tester. The following video shows what this testing apparatus looks like.

https://www.youtube.com/watch?v=iRBkWFmCyco

Calculations:
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titleReported during test:

Note that none of these had associated calculations/symbols

Variable

Shear

stress

Stress at failure

.

Max and min shear stress at failure and percentages of wood failure

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The standard

Standard deviation of all individual test values

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Average shear stress at failure and the average percentage of wood failure.

Variable

Shear Stress at failure

Max and min shear stress at failure and percentages of wood failure

Standard deviation of all individual test values

ASTM D950_Standard Test Method for Impact Strength of Adhesive Bonds

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