i- Draw sketches showing the relations between the fracture toughness Kic and each of the following:-...

 

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i- Draw sketches showing the relations between the fracture toughness Kic and each of the following:- Thickness, Tensile Strength Temperature Grain size ii- A long closed cylinder is made of a steel (Kc = 34 MPa m2). The cylinder has a diameter of 1200 mm, a wall thickness of 20 mm and is subjected to an internal gauge pressure of 10 MPa. 20 mm a) Determine the size of a circumferential surface elliptical crack (a/ 2c = 0.25) required to cause fracture at this pressure. b) Determine the internal pressure that will cause fracture for a longitudinal crack of size 10 mm. (a/ 2c = 0.25) c) If the cylinder has an initial elliptical circumferential crack of 8 mm and is subjected to a pressure varying between 10 MPa and -1 MPa, then estimate the number of loading cycles this cylinder can withstand before fracture. (Crack growth parameters: m = 3.5 and C = 2.5 (m/cycle & MPa) ). Take an average value of f (a/W) = 1. 10-12 2 C ak Elliptical crack of a/2C = 0.25 i- Draw sketches showing the relations between the fracture toughness Kic and each of the following:- Thickness, Tensile Strength Temperature Grain size ii- A long closed cylinder is made of a steel (Kc = 34 MPa m2). The cylinder has a diameter of 1200 mm, a wall thickness of 20 mm and is subjected to an internal gauge pressure of 10 MPa. 20 mm a) Determine the size of a circumferential surface elliptical crack (a/ 2c = 0.25) required to cause fracture at this pressure. b) Determine the internal pressure that will cause fracture for a longitudinal crack of size 10 mm. (a/ 2c = 0.25) c) If the cylinder has an initial elliptical circumferential crack of 8 mm and is subjected to a pressure varying between 10 MPa and -1 MPa, then estimate the number of loading cycles this cylinder can withstand before fracture. (Crack growth parameters: m = 3.5 and C = 2.5 (m/cycle & MPa) ). Take an average value of f (a/W) = 1. 10-12 2 C ak Elliptical crack of a/2C = 0.25

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i Relations between Fracture Toughness Kic and Parameters a Thickness In general fracture toughness tends to decrease with increasing thickness This is because thicker specimens typically contain more ... View the full answer