Work Item
ASTM WK84534

Revision of E8/E8M-22 Standard Test Methods for Tension Testing of Metallic Materials

Rationale

Rational:
Many Aerospace primes currently require a strain rate of 0.005 in/in/min (0.005mm/mm/min). AMS Committee E and F has begun updating their specifications to require a specified strain rate control. The strain rate is to be set at 0.005 in/in/min (0.005mm/mm/min) with a tolerance of +/- 0.002 in/in/minute through the 0.2% offset yield. When testing is performed to multiple specifications, frequently additional testing is required to meet the ASTM E8/E8M control method A, B or C listed in industry specifications, such as ASTM and ASME when paired with AMS and Aerospace specifications.
Note 29 was added to allow testing to 0.005 inch/inch/minute (0.005 mm/mm/minute) when required by industry and/or customer specifications and still be allowed to certify testing as meeting ASTM E8/E8M. To better align with many industry standards as well as aerospace primes, this proposal is to accept strain rate control at 0.005 in/in/min. as new Control Method D.

The ballot is to add the following paragraph as a fourth control method allowed by ASTM E8/E8M and remove note 29.
7.6.4.4 Control Method D – Rate of straining control method for determining yield Properties. In this method the testing machine shall be operated in closed-loop control using the extensometer signal. The rate of straining shall be set and maintained at 0.005 ± 0.002 mm/mm/min [in/in/min.].
Note: This Control Method is included for use on materials that have been historically tested at this speed of 0.005 mm/mm/min such as many materials used in the aerospace industry.
X4.2.4 Control Method D — Rate of Straining Control Method for Determining Yield Properties. This control method is similar to Method B. The difference between Method B and Method D is the control speed of Method D is three times slower than Method B. For strain-rate sensitive materials, yield results can be significantly different using these two different rates
The strain rate stated in method D has been historically used within the aerospace industry and has gained wider usage for similar alloys in other industries.

Note that only the addition of Para. 7.6.4.4 Control Method D and Para. X4.2.4 are to be considered for this ballot.


Details

Developed by Subcommittee: E28.04

Committee: E28

Staff Manager: Ashley Wiand

Work Item Status

Date Initiated: 12-12-2022

Technical Contact: Margaret Willis

Item: 000

Ballot:

Status: