Using the chart given below, calculate the strength in psi and in MPa of a piece

Question

Using the chart given below, calculate the strength in psi and in MPa of a piece of Aluminum of hardness 50HRA. Assume the HB values given in the chart are at a load of 3000 Kg.

10000 8000 10rDiamond Diamond Cubic boron nitride Boron carbide Titanium carbide 4000 9Corundum 14008 Topaz Tungsten carbide 1 100 7 Quartz Cementite Hard chromium plate 1000 80 100O 100 X Martensite 700 6 -Orthoclase Fully hardened tool steel 700 700 500F- 400 120 70 250Glass 75 60 5 Apatite 400 40 Cold-drawn 0.5 C steel Cold-drawn 0.25 C steel 150 100 4 Fluorite Titanium 10 100Gray iron Malleable iron Annealed mild steel 150 3 Calcite 75 150 70 40 70-30 brass Nickel Pure iron 100 100 100 9 80 70 Talc Bakelite 40 40 Zinc, gold, magnesium Silver Polystyrene Pure aluminum Vinyl resin Graphite 10 10

Explanation / Answer

According to given table

Look at HRA line and UTS line. point 50 at HRA line coincides horizontally at 75 UTS line hence its Strength is 75x103  psi.

And we know the relation 1psi = 6894.75729 Pascal (Pa) so that we convert 75x103 psi to MPa i.e. 517 MPa.

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