Final answer:
The student is asking for the endurance strength estimation of a 1.5-inch diameter 1040 steel rod with a machined finish and a given tensile strength, loaded in rotating bending conditions. An accurate estimate requires a specific formula or engineering data based on the provided factors.
Step-by-step explanation:
The question pertains to estimating the endurance strength of a 1.5-inch diameter rod made of 1040 steel with a machined finish, heat treated to a tensile strength of 110 kpsi, under rotating bending conditions. Estimating endurance strength involves considering the material properties, geometry, surface finish, and operating conditions of the component. The endurance strength is typically determined as a fraction of the tensile strength for a given material and is influenced by factors such as surface finish and size. For 1040 steel, a machined surface finish and the specified tensile strength would need to be factored into the calculation using a standard formula or engineering data for endurance limits of materials. However, without a specific formula or table, an accurate estimate cannot be provided.