Again you are totally totally WRONG.
You are basing your 'theory' solely on tensile strengths that are for ductile failure only, completely ignoring the fatigue endurance limit values. Ignoring the fatigue values (by published values, adding adequate safety factors, or by values derived by actual destructive testing) is foolhardy and omits one of the MOST IMPORTANT factors pertaining to cyclically loaded structures such as boat rigging. One who sizes such solely on tensile values alone is totally omitting these important selection factors.
A chain link is a complex beam and is much beyond simple tensile values to ensure that it will 'work' over long term service. Recommending such is totally irresponsible.
You are basing your 'theory' solely on tensile strengths that are for ductile failure only, completely ignoring the fatigue endurance limit values. Ignoring the fatigue values (by published values, adding adequate safety factors, or by values derived by actual destructive testing) is foolhardy and omits one of the MOST IMPORTANT factors pertaining to cyclically loaded structures such as boat rigging. One who sizes such solely on tensile values alone is totally omitting these important selection factors.
A chain link is a complex beam and is much beyond simple tensile values to ensure that it will 'work' over long term service. Recommending such is totally irresponsible.