Concept explainers
A 10-mm steel drill rod was heat-treated and ground. The measured hardness was found to be 300 Brinell. Estimate the endurance strength in MPa if the rod is used in rotating bending.
The endurance strength.
Answer to Problem 1P
The endurance strength is
Explanation of Solution
Write the expression for the ultimate tensile strength of the steel.
Here, the ultimate tensile strength is
Write the expression for the endurance limit of the steel.
Here, the endurance limit is
Write the expression for the surface factor
Here, the surface factor is
Write the expression for the size factor.
Here, the size factor is
Write the expression for Marin equation.
Here, the endurance strength of the material is
Conclusion:
Refer to Table 6-2 “Parameters for Marin Surfaces Modification Factor”. Obtain the values of factors for ground surface finish as,
Substitute
Substitute
Substitute
Substitute
Substitute
The endurance strength is
Want to see more full solutions like this?
Chapter 6 Solutions
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
- 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 psiarrow_forwardDetermine the indentation diameter of a mild steel material subjected to a Brinell hardness test with a test force of 8.1 kN using a hardened steel ball indentor of 10 mm. Take the Brinell Hardness Number as 926. Also, determine the surface area of indentation. (NOTE: Please Solve the problem in a paper and upload in the separate submission link provided and also fill the answers without the unit in the box below) i) Indentation Diameter (in mm) -- ii) Surface Area of Indentation (in mm?)arrow_forwardDuring the test of hardness due to Brinell, the diameter of the testing sphere was0.01m, the exerted load was 3.0 tons and the diameter of the indented area wasapproximately 0.003 m. Find the value of the hardness for this material. Also find theTensile strength if the proportionality constant was approximately 3.45.arrow_forward
- 1. Estimate the actual endurance limit for a 0.625-in-diameter rod made from C1118, as rolledsteel. It is to be subjected to repeated and reversed bending stress. A reliability of 99% isdesired. Please give the FBD also pero calculation, thank youarrow_forwardPlease give right answer otherwise skip.i will report. A rotating bar made of steel with ultimate strength of 600 MPa is subjected to a completely reversed bending stress. The corrected endurance limit of the bar is 300 MPa. Draw the S-N curve. Calculate the fatigue strength of the bar for a life of 90,000 cycles.arrow_forwardcalculate hardness (Brilnell Hardness, HB): Ø Tested material – bronze Ø Force loading the intender (constant value), P – 2452 N Ø The diameter of the carbide ball intender, D – 10 mm Ø The diameter (mean value) of the print, d – 2,00 mmarrow_forward
- Calculate Brinell Hardness for Hardened AW-6060 Aluminium if mean depression diameters (d)= 5.64mm with applied load of * ?3000kgfarrow_forwardI need a clear answer by hand, not by keyboard and fast answer within 20 minutes. Thank you | dybala A circular specimen of MgO is loaded using a three-point bending mode. Radius of the specimen is 5.5mm Compute the maximum load without fracture, given that the bending strength (abend) is 105 MPa, and the length between support points (L) is 100 mm.arrow_forwardA rod specimen of ductile cast iron was tested in a torsion-testing machine. The rod diameter was 16 mm, and the rod length was 360 mm. When the applied torque reached 254.8 N-m, a shear strain of 1780 microradians was measured in the specimen. What was the angle of twist in the specimen? Part 1 Calculate the shear stress in the specimen. Correct Answer: T= 316.97 eTextbook and Media Part 2 Correct Use Hooke's Law to calculate the shear modulus of the specimen. answer: G= 178073.034 Part 3 eTextbook and Media Incorrect MPa Answer: Calculate the angle of twist in the specimen. D=0.8006 MPa O Attempts: 1 of 5 used Attempts: 1 of 5 usedarrow_forward
- Derive the expression of shear plane angle. Draw and mention all corresponding angle required for the same. Explain the importance of card model and derive the expression of shear strain.arrow_forwardA rod specimen of ductile cast iron was tested in a torsion-testing machine. The rod diameter was 16 mm, and the rod length was 360 mm. When the applied torque reached 254.8 N-m, a shear strain of 1780 microradians was measured in the specimen. What was the angle of twist in the specimen? Part 1 Calculate the shear stress in the specimen. Correct Answer: T= 316.97 eTextbook and Media Part 2 Use Hooke's Law to calculate the shear modulus of the specimen. answer: G= i MPa MPa Attempts: 1 of 5 usedarrow_forwardI need the answer for yield point and the rest of the problem.arrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY