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What thickness of aluminium sheet do I need to achieve the same strength of a 1/8" st

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• What thickness of aluminium sheet do I need to achieve the same strength of a 1/8" st

• What thickness of aluminium sheet do I need to achieve the same strength of a 1/8" st

  KamorkasOa > 08-06-2018, 08:37 AM

  I want to use a boat with an aluminium hull. The authorities wants me to prove by calculation that the hull strength (longitudinal, lateral and local strength) equals at least the strength that would result from the use of steel plate of a thickness of 0.11811 inches. So what I'm looking for is:
  

  1. A gross idea of the aluminium plate thickness I need;
     
     
  2. A method for showing that the aluminum plate is strong enough to be substituted for the steel one.
     

  How can I calculate that thickness?

• RE: What thickness of aluminium sheet do I need to achieve the same strength of a 1/8" st

  askaluadmin > 08-06-2018, 08:38 AM

  For tensile, metals are usually used until their yield (start to have permanent deformation).
  
  A36 steel in plates, bars, and shapes with a thickness of less than 8 in (203 mm) has a minimum yield strength of 36,000 psi (250 MPa) and ultimate tensile strength of 58,000–80,000 psi (400–550 MPa).
  
  The yield strength of pure aluminium is 7–11 MPa, while aluminium alloys have yield strengths ranging from 200 MPa to 600 MPa.[9]
  
  That makes steel is stronger 22.7-35.7 times alumunium. So alumunium thk required is 22.7-35.7 times (2.84" to 4.46"). Depends on what steel and al-alloys.
  
  Use tensile test to check.
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