BS EN ISO 6892-1:2009 Metallic materials. Tensile testing. Method of test at ambient temperature
BS EN SIO 6892-1 is the standard that brings together the European and international methods of testing metallic materials at ambient conditions.
BS EN ISO 6892-1 is for designers and engineers of metallic products and components; specifiers and the insurance industry. It will also be a useful reference for major fabrication contracts between manufacturers and customers.
BS EN ISO 6892 consists of the following parts, under the general title Metallic materials. Tensile testing:
- Part 1: Method of test at room temperature
The following parts are under preparation:
- Part 2: Method of test at elevated temperature
- Part 3: Method of test at low temperature
The following part is planned:
- Part 4: Method of test in liquid helium
In Part 1 of BS EN ISO 6892, there are two methods of testing speeds available. The first (method A) is based on strain rates (including crosshead separation rate), and the second (method B) is based on stress rates. BS EN ISO 6892-1 specifies the method for tensile testing of metallic materials and defines the mechanical properties which can be determined at room temperature.
Method A is intended to minimize the variation of the test rates during the moment when strain rate sensitive parameters are determined, and to minimize the measurement uncertainty of the test results.
Complementary recommendations for computer controlled testing machines are also indicated.
Contents of BS EN ISO 6892-1 include:- Introduction
- Scope
- Normative references
- Terms and definitions
- Terms and symbols
- Principle
- Test piece
- Determination of original cross-sectional area
- Marking the original gauge length
- Accuracy of testing apparatus
- Conditions of testing
- Determination of the upper yield strength
- Determination of the lower yield strength
- Determination of proof strength, plastic extension
- Determination of proof strength, total extension
- Method of verification of permanent set strength
- Determination of the percentage yield point extension
- Determination of the percentage plastic extension at maximum force
- Determination of the percentage total extension at maximum force
- Determination of the percentage total extension at fracture
- Determination of percentage elongation after fracture
- Determination of percentage reduction of area
- Test report.
- Measurement uncertainty
- Recommendations concerning the use of computer-controlled tensile testing machines
- Types of test pieces to be used for thin products: sheets, strips and flats between 0,1 mm and 3 mm thick
- Types of test pieces to be used for wire, bars and sections with a diameter or thickness of less than 4 mm
- Types of test pieces to be used for sheets and flats of thickness equal to or greater than 3 mm
- Types of test pieces to be used for tubes
- Estimation of the crosshead separation rate in consideration of the stiffness (or compliance) of the testing machine
- Measuring the percentage elongation after fracture if the specified value is less than 5 %
- Measurement of percentage elongation after fracture based on subdivision of the original gauge length
- Determination of the percentage plastic elongation without necking, Awn, for long products such as bars, wire and rods
- Estimation of the uncertainty of measurement
- Precision of tensile testing — results from interlaboratory programmes
