| Design stress |
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| First
of all, what is stress: |
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| l | F/A =s (Force/Area) |
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| Design
Stress, sd |
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| l | Used to account
for uncertainties in material |
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| properties and
inexact information about loadings |
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| l | If
loading is static, or material is ductile then sd = |
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| N’*sc (maximum
stress calculated * a design |
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| factor) |
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| l | Engineer should
select a material with a yield |
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| strength,Sy, of at sd. |
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