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ASTM D638 PDF SOFTWARE
ASTM D638 PDF PC

However, designs of large engineering structures may rely on mechanical properties based on ASTM D3039 for fiber-reinforced polymer composites. You can use wedge, pneumatic, vise, or other self tightening grips such as eccentric roller or scissor grips.Test specimens following ASTM D638 standards are frequently used to measure the tensile properties of reinforced and unreinforced polymers machined with traditional machining and emerging manufacturing methods (additive manufacturing/3D printing). Any grip with serrated faces is usually adequate for this.

ASTM D638 PDF SOFTWARE

For example, our MTESTQuattro testing software has built in support for ASTM D638 and all of these calculations are provided immediately after performing the test.

ASTM D638 PDF PC

However, fully PC based systems have the capability to calculate all of these automatically. Using these sources of data, you can determine and calculate all of the analysis listed above. Basic systems will provide the raw data, and stress-strain charts.

Software or suitable electronics are required to operate the machine and to take the measurements.

2) Dumbbell specimens do not have uniform widths so there will be errors when both the wide and narrow sections of the dumbbell shaped specimen elongate at different rates. Why? For two reasons: 1) The linear region of plastics is very small and happens suddenly so grip separation is just not accurate enough.

Required when measuring modulus, yield, and modulus.

A high capacity 10,000 lbf model is sometimes needed for larger samples and/or stronger materials such as reinforced plastics or composites. A 2,000 lbf dual column system is also very common. A 1,000 lbf single column system is usually sufficient for most non-reinforced plastics.

Capacity needs to be enough for your materials.

Needs to be servo controlled to keep a constant rate of speed.

Universal testing machine (tensile testing machine).

Poisson’s Ratio (Requires Transverse Extensometer).

Nominal Strain at Break (Grip Separation).

End the test after sample break (rupture).

The target time from start of test to break should be from 30 seconds to 5 minutes. Speed depends on specimen shape and can range from 0.05 – 20 inches per minute.

Begin the test by separating the tensile grips at a constant rate of speed.

The exact shape you use is dependent upon your material’s rigidity and thickness.

Cut or injection mold your material into one of the five “dumbbell” shapes.

If you have film under 1mm in thickness use ASTM D882. This is a quick summary to decide if this test is right for you, and to point out what equipment you need to perform the test.įirst off, do not perform this test if you have films or elastomers. If you are going to perform this test, you should read the entire specification from ASTM. A universal testing machine (tensile testing machine) is needed to perform this test. This test method uses standard “dumbell” or “dogbone” shaped specimens under 14mm of thickness. ASTM D638 is one of the most common plastic strength specifications and covers the tensile properties of unreinforced and reinforced plastics.