Question 1A plastic-lined steel pipe has the cross-sectional shape shown in Figure Q1 The steel pipe100 mm and inner diameter d2 94 mm The plastic liner hashas an outside diameter dan inner diameter d, 82 mm The modulus of elasticity of the steel is 75 times the modulusof the plasticDetermine the allowable bending moment Mallow f the allowable stress in the steel is 35MPa and that in the plastic is 600 kPaIf the pipe and Iiner diameters remain unchanged, what new value of allowable stressfor the steel pipe will result in the steel pipe and plastic liner reaching their allowablestress values under the same maximum moment (e, a balanced design)?What is the new maximum moment?d3d27Figure Q1 Composite steel-plastic pipe.

Question
Step 1

a)

Elasticity of steel is equal to seven times of elasticity of plastic.

Step 2

Calculate the allowable bending moment in the pipe.

Step 3

b)

Calculate the allowable bending mom...

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