Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: AASHTO T 68M/T 68:2009
• Năm ban hành / Publication date: 2009
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Standard Method of Test for Tension Testing of Metallic Materials

Thay thế cho / Replace

AASHTO T 68:2005

• Số trang / Page: 26

Phạm vi áp dụng / Scope of standard

These test methods cover the tension testing of metallic
materials in any form at room temperature, specifically, the
methods of determination of yield strength, yield point elongation,
tensile strength, elongation, and reduction of area.

The gage lengths for most round specimens are required to be 4D
for E 8 and 5D for E 8M. The gage length is the most significant
difference between E 8 and E 8M Test Specimens Test specimens made
from powder metallurgy (P/M) materials are exempt from this
requirement by industry-wide agreement to keep the pressing of the
material to a specific projected area and density.

Exceptions to the provisions of these test methods may need to
be made in individual specifications or test methods for a
particular material. For examples, see Test Methods and Definitions
A 370 and Test Methods B 557, B 557M.

Room temperature shall be considered to be 10 to 38°C [50 to
100°F] unless otherwise specified.

The values stated in SI units are to be regarded as separate
from inch/pound units. The values stated in each system are not
exact equivalents; therefore each system must be used independently
of the other. Combining values from the two systems may result in
non-conformance with the standard.

This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.