A setup for single-edge-notch-bending (SENB) tests is shown below. Support rollers provide frictionless contact with the specimen, while a load is applied at the middle of the top surface of specimen. The thickness of the specimen is 10 mm and the height W 10mm. The properties for this ductile alloy are E = 70 GPa, v=0.3, σᵧ = 400 MPa, Kᵢ? = 25 MPa.m¹/². (1) Ignore any crack or defects in the material, what is the maximum static force that the specimen could carry before failure? (2) A cyclic load of low amplitude 2.8 kN is applied. Because of the cyclic load a defect is nucleated on the edge and grows into a fatigue crack of 2 mm length shown in the right. If the cycling is interrupted, what is the maximum static tensile force that the specimen could carry? (3) With more cycles, the fatigue crack keeps growing. Estimate the critical crack length (a range is fine) at which the plate will fail from the low-amplitude cyclic load 2.8 kN only. (maximum two iterations are needed)
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(1) Ignore any crack or defects in the material, what is the maximum static force that the specimen could carry before failure?
(2) A cyclic load of low amplitude 2.8 kN is applied. Because of the cyclic load a defect is nucleated on the edge and grows into a fatigue crack of 2 mm length shown in the right. If the cycling is interrupted, what is the maximum static tensile force that the specimen could carry?
(3) With more cycles, the fatigue crack keeps growing. Estimate the critical crack length (a range is fine) at which the plate will fail from the low-amplitude cyclic load 2.8 kN only. (maximum two iterations are needed)
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