Mechanical Property Measurement


Mechanical properties are measured using a uniaxial tension test based on the test standard of ASTM (NA), JIS (Japanese) or EN (European).  The tension test is performed on a hydraulic- controlled machine with computerized data acquisition.  The machine is capable of pulling any typical strengths and gauges used in automotive applications. The mechanical properties measured from a tension test include:

• yield strength – 0.2% offset (default) or upper and lower yielding strength if YPE is present
  
• tensile strength
  
• uniform elongation
  
• yield point elongation (YPE) (if present)
  
• n-value (strain hardening exponent) and K-value (material strength coefficient)
  
• r-value (anisotropy value)

Typical stress and strain data from a tension test is shown in the figure below.