1) 1 MPa = 10 bar = 1 N/mm2
2) When a yield point is not easily defined based on the shape of the stress-strain curve an offset yield point is arbitrarily defined. The value for this is commonly set at 0.2%.
3) Tensile Test complies with JIS Z 3198-2 (Tensile test method for Pb-free solder) Tension Speed 10mm/min
4) The coefficient n is a measure of the amount by which a material hardens with increasing deformation strain φg and is therefore known as the strain hardening coefficient.
1) Measure the time until soldered part (Cu wire on single-sided board and hang 1kg weight on Cu wire under 130°C air) dropped off.