02_HomeworkCE371

You work for an off-shore wind turbine manufacturer and have been asked to review data from the support structure development team. The cost of the high strength steel currently used in the support structure has increased significantly in the last 12 months so the development team have manufactured some components to an identical design using a cheaper grade of structural steel. Company policy states that the critical tensile stress must be 30% more than the expected maximum in service stress of 420MPa. Given the information below, what is critical tensile stress of the cheaper grade of structural steel and would you recommend its use in the wind turbine support structure? Alternate Steel Analysis Report: • Detected maximum internal flaw size = 1.0 μm, ● Specific surface energy 1.3 J/m2, ● Youngs Modulus = 210GPa Select one or more: a.590 MPa b.Yes, would recommend c.417 MPa d.13.2 MPa e.No, would not recommend f.18.6 MPa

You work for an off-shore wind turbine manufacturer and have been asked to review data from the support structure development team. The cost of the high strength steel currently used in the support structure has increased significantly in the last 12 months so the development team have manufactured some components to an identical design using a cheaper grade of structural steel. Company policy states that the critical tensile stress must be 30% more than the expected maximum in service stress of 420MPa. Given the information below, what is critical tensile stress of the cheaper grade of structural steel and would you recommend its use in the wind turbine support structure? Alternate Steel Analysis Report: • Detected maximum internal flaw size = 1.0 μm, • Specific surface energy 1.3 J/m2, • Youngs Modulus = 210GPa Select one or more: a. 18.6 MPa b. No, would not recommend DC. 417 MPa Od. 590 MPa 0 e. Yes, would recommend Of. 13.2 MPa

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An electric car manufacturer is looking to utilize some stock AISI 8740, hot rolled steel bars that are around 2 inches in diameter for their conveyor system that is being set up to start producing their own batteries. The data sheet shows the the bars to have 132,000 psi tensile strength, 87,500 psi yield strength, and 16.7% elongation. A hardness of 262 Bhn allows it to be finish machined after heat treatment. They keep their workspace at 70°F. What is the working endurance strength, Se? 39,750 psi 28,562 psi 42,500 psi 33,400 psi

what conclusions you can draw from this graph

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A compression test is performed on a 2” diameter by 5” long bar of an unknown metal.  At the end of the compression test, the bar has a height of 3.5 inches.  The strength coefficient (K) and the work hardening coefficient (n ) are 250 MPa and 0.4, respectively.  State all assumptions needed to work the problem. a) Calculate the final diameter of the bar in inches.   b) Calculate the flow stress in MPa when the length of the bar is 4”.

I need the answer as soon as possible

Please match Heat-Treated Steels with their hardness HB numbers, according to the charts shown below. a) SAE 1040 WQT at different Temperatures   b) SAE 4140 OQT at different Temperatures   c) SAE 4340 OQT at different Temperatures                                                               SAE 1040 WQT 1000                                                             SAE 4140 OQT 1000                                                             SAE 4140 OQT 1100                                                             SAE 4340 OQT 800 a. HB = 415 b. HB = 341 c. HB = 311 d. HB = 269

Question 1) A compression coil spring made of an alloy steel is having the followingspecifications :Mean diameter of coil = 50 mm ; Wire diameter = 5 mm ; Number of active coils = 20.If this spring is subjected to an axial load of 1000 N ; calculate the maximum shear stress(neglect the curvature effect) to which the spring material is subjected.

10. Measure the diameter of impression using the profile projector and compute for the hardness number using the formula: Where: 2P P – Applied Load D - Diameter of steel ball (8.0 mm) BHN «D(D- /D² – d² d - Ave. diameter of indentation | Raw data: Diameter Specimen (carbon steel) d1 d2 Air cooled 5.13 5.22 Oil quenched Water quenched 4.12 4.36 3.74 3.81 Note: All dimensions are in mm.

An application requires ultimate tensile strength and yield strength ofa steel at 110 ksi and 91 ksi, respectively. Answer the following 4 questions:4.1. Can SAE 1040 steel be selected for this application?4.2. If “no” is the answer in Part I, the following Part II, III, and IV can beignored. If “yes” is the answer in Part I, which condition of SAE 1040 shouldbe selected?4.3. Why is that steel with the condition in part II selected?4.4. Is the selected steel brittle or ductile? and Why?

V Question Completion Status: 1.805 QUESTION 3 A 13-kN hydraulic press for removing and reinstalling bearings in small-to medium-sized electric motors is to consist of a commercially available cylinder mounted vertically in a C- frame, with dimensions as sketched in the Figure shown below. It is being proposed to use ASTM A-48 (Class 50) gray cast iron (brittle material with ultimate strength, Su-345 MPa) for the C-frame material. State whether true/false. Under the loading conditions, failure happens 18 mm 38 mm 13 kN 10 mm -90 mm 25 mm A A 10 mm O True O False AurCT ION A Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save A re to search

10.3 A mild steel, known to have a proportional limit of 34,000 psi, was subjected to a tension test. Stresses and strains were calculated at three points as follows: (stress) 10,000 psi, 25,000 psi, and 40,000 psi; (associated strains) 0.000343, 0.000858, and 0.035 in./in. Calculate the modulus of elasticity, E, and comment on the data.