Soil Instruments 1030, Руководство пользователя

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User Manual
12
Force (F) = Stress (S) x Area (A)
Where A = Cross sectional area in m²
Where F units = Newton’s
Where S units = N/m²
Stress (S) = Young Modulus of Elasticity (E) x Strain ( )
Where E units = N/m²
Example calculation
Steel pipe outside diameter = 1.016m
Steel pipe inside diameter = 0.984m
Calculated change from the strain gauges = 54.688
Young Modulus of Elasticity of the steel pipe = 200,000,000,000 N/m²
Stress = E x
= 200,000,000,000 x 0.000054688
=10937600 N/m²
Area = r²
= x (outside diameter /2)² - x (inside diameter /2)²
= x (1.016 /2)² - x (0.984 /2)²
= x (0.508)² - x (0.492)²
= x 0.258064 - x 0.242064
= 0.810732 m² – 0.760466 m²
= 0.050266 m²
Force = S x A
= 10937600 x 0.050266
= 549789.4N