Metals

Facilities for carrying out the tensile testing of metals from room temperature to 1000 °C . Flat and round specimen geometries can be accommodated and a range of extensometry available. UKAS accredited test.

Standard procedures used or applicable

EN 10002, ASTM E8

Particulate and Fibre reinforced MMCs

UKAS accredited facility for the tensile testing of particulate and fibre reinforced MMCs at room temperature. The test method is similar to that proposed in EN 10002, but uses strain gauges bonded to both sides of a flat test piece to eliminate bending and get an accurate value for the strain reading and Young's modulus.

Proprietary NPL software has been developed to perform the data analysis and Young's modulus calculations by analysing the secant and tangent moduli.

Standard procedures used or applicable

EN 10002, ASTM E8

Stress/strain curves for ductile polymers

Measurement limits are typical values and may depend on the material being studied.

Finite element analysis determination of data for predictions under impact loading - hardening curves for elastic-plastic models

Measurement of tensile stress/strain curves for ductile polymers
- Up to strains of 100%
- Over a range of strain rate up to 10 s-1

Measurement of Poisson’s ratio up to 50% strain at a strain rate around 0.01 s-1

Derivation of tensile true stress/true strain curves

Derivation of true stress/true plastic strain curves. These are hardening curves used by elastic-plastic models in finite element analyses.

Derivation of true stress/true plastic strain curves over a range of strain rate up to 1000 s-1. The high rate curves are obtained by modelling experimental data at low and moderate rates and extrapolating parameters to higher rates.