Overview
ISO/TR 15263:2024 - Measurement uncertainties in mechanical tests on metallic materials - provides a practical method for evaluating uncertainties in tensile testing. The technical report describes how to obtain uncertainty estimates for tensile tests performed at room temperature (ISO 6892-1) and elevated temperature (ISO 6892-2), under axial loading with digital acquisition of force and displacement. It assumes continuous tests on specimens with uniform gauge lengths and includes informative annexes with formulae, a worked example and interlaboratory scatter data.
Key topics
- Scope and measurands: Lists measurable quantities in tensile testing (e.g., proof strength, upper/lower yield, tensile strength, percentage elongation, reduction of area, original cross‑section, gauge length).
- Five-step uncertainty evaluation:
- Step 1 - Define the measurands for which uncertainty is to be evaluated.
- Step 2 - Identify all sources of uncertainty in the test.
- Step 3 - Estimate standard uncertainties (Type A and Type B).
- Step 4 - Compute the combined standard uncertainty.
- Step 5 - Compute the expanded uncertainty (using a coverage factor).
- Statistical treatment: Use of Type A (statistical) and Type B (other) evaluations, sensitivity coefficients, degrees of freedom (Welch–Satterthwaite), and reporting conventions.
- Supporting material:
- Annex A: Mathematical formulae for calculating uncertainties in tensile testing.
- Annex B: Worked example (calculation for proof strength at ambient temperature).
- Annex C: Interlaboratory scatter - typical reproducibility ranges observed across labs.
Applications
ISO/TR 15263:2024 is intended to help laboratories and engineers produce traceable, quantified uncertainty statements for tensile test results. Practical uses include:
- Reporting measurement uncertainty for material properties (Rp0.2, Rm, ReH/ReL, A, Z).
- Comparing in-house test repeatability with interlaboratory reproducibility.
- Supporting materials qualification, test method validation, and improved confidence in test reports.
- Providing a documented, repeatable approach for uncertainty estimation when using digital force/displacement acquisition at ambient or elevated temperatures.
Who should use this standard
- Materials testing laboratories and technicians performing tensile tests.
- Quality and materials engineers interpreting mechanical property data.
- Test method developers and lab managers preparing uncertainty budgets.
- Organizations involved in interlaboratory comparisons and conformity assessment.
Related standards
Key references that integrate with ISO/TR 15263:2024 include:
Keywords: ISO/TR 15263:2024, measurement uncertainties, tensile testing, metallic materials, uncertainty evaluation, ISO 6892-1, ISO 6892-2, combined uncertainty, expanded uncertainty, Type A, Type B, interlaboratory scatter.