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Allowable Contact Stress - Aluminium Sprocket

Allowable Contact Stress - Aluminium Sprocket

Allowable Contact Stress - Aluminium Sprocket

(OP)
I have used the hertzian line contact formula to arrive at a contact stess between an aluminium sprocket & steel roller chain.
For a steel sprocket, I have read that a good rule of thumb for the max allowable stress (for 10^8 cycles) = 2.76HB-70MPa (where HB = Brinell hardness).
Does anyone know of a similar rule of thumb for aluminium?
The grade of alum I'm looking at is A380 (LM24 to any Brits)

Thank you, Alan

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