ASTM E6 and E29 Standards Quiz and Flashcards

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Questions and Answers

What type of grips are recommended for testing sheet materials?

Self-adjusting grips standardized dimensions

Why may grips for testing sheet materials not totally represent the properties of the entire end product?

They cannot be tested satisfactorily in the usual type of wedge grips.

What are considered satisfactory for acceptance testing of commercial shipments?

Wedge or snubbing grips

What accuracy and precision are required for dimension-measuring devices?

At least one half the smallest unit to be measured Signup and view all the answers

What should testing machines used for tension testing conform to?

The requirements of Practices E4 Signup and view all the answers

What is the effect of eccentric force application on the determination of yield behavior?

It may increase the stress by 1.5 percentage points for each 0.025 mm [0.001 in.] of eccentricity. Signup and view all the answers

How does the gage length of the extensometer relate to the nominal gage length of the specimen being tested?

The gage length of the extensometer should be equal to the nominal gage length of the specimen being tested. Signup and view all the answers

Define upper yield strength (UYS) in a uniaxial test.

It is the first stress maximum associated with discontinuous yielding at or near the onset of plastic deformation. Signup and view all the answers

What is yield point elongation (YPE) in a uniaxial test?

It is the strain separating the stress-strain curve’s first point of zero slope from the point of transition from discontinuous yielding to uniform strain hardening. Signup and view all the answers

How is the YPE end point determined if the transition occurs over a range of strain?

It is the intersection between a horizontal line drawn tangent to the curve at the last zero slope and a line drawn tangent to the strain hardening portion of the stress-strain curve at the point of inflection. Signup and view all the answers

What is uniform elongation in material testing?

Uniform elongation includes both elastic and plastic elongation in a material. Signup and view all the answers

How does the fracture distance impact tensile properties in testing?

The fracture distance may impact stress increase by 2.5 percentage points for each 0.025 mm [0.001 in.] of eccentricity. Signup and view all the answers

What is the percentage increase in stress for each 0.025 mm [0.001 in.] of eccentricity in a 9 mm specimen?

2.5 percentage points. Signup and view all the answers

What does the nominal gage length of a standard 12.5-mm specimen indicate in testing?

It indicates the gage length required for the specimen being tested. Signup and view all the answers

How is the bending moment and stress added to illustrate the effect of eccentric force application?

By calculating the bending moment and stress added to the specimen. Signup and view all the answers

Study Notes

Terminology and Exceptions

E8 and E8M test specimens have significant differences in gage length, particularly for powder metallurgy (P/M) materials.
Exceptions to test methods may be necessary for individual specifications or materials, as seen in Test Methods A370 and B557.
Room temperature is considered 10 to 38°C (50 to 100°F) unless specified otherwise.

Test Machine Preparation

The test machine should be exercised or warmed up to normal operating temperatures to minimize errors from transient conditions.
Measurement of dimensions should be done at the center of the reduced section, where the least cross-sectional area is found.

Tension Test Specimens

Transverse tension test specimens for tube may be taken from rings cut from the ends of the tube.
Flattening of the specimen may be done before or after separating the specimen.
Small-size specimens may be used for large tube under 20 mm (0.750 in.) in wall thickness.

Grips and Dimension-Measuring Devices

Self-adjusting grips are suitable for testing sheet materials that cannot be tested in usual wedge grips.
Grips for wire may be of the wedge or snubbing type.
Dimension-measuring devices, such as micrometers, should be accurate and precise to at least one half the smallest unit of measurement required.

Testing Machines

Testing machines should conform to the requirements of Practices E4.
For referee testing, the ends of the 12.5 mm (0.500 in.) wide specimen should be symmetrical within 0.2 mm (0.01 in.).

Measurement and Calculation

Cross-sectional dimensions of test specimens with rough surfaces may be measured and recorded to the nearest 0.02 mm (0.001 in.).
The effect of eccentric force application may be illustrated by calculating the bending moment and stress added.
For measuring elongation, the gage length of the extensometer should be equal to the nominal gage length required for the specimen being tested.

Definitions

Uniform elongation includes both elastic and plastic elongation.
Upper yield strength (UYS) is the first stress maximum associated with discontinuous yielding at or near the onset of plastic deformation.
Yield point elongation (YPE) is the strain separating the stress-strain curve's first point of zero slope from the point of transition from discontinuous yielding to uniform strain hardening.

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Description

Test your knowledge on ASTM standards for mechanical testing methods, significant digits in test data, and verification of extensometer systems. Learn about test specimens, conformance with specifications, and maintaining a specific projected area.

E6, E8, E8M, E29, and E83 ASTM Standards Quiz