Scribd
Upload
209 views1 page

Assignment 1

This document describes an assignment on hardness testing. It includes 10 multiple choice questions testing knowledge of different hardness tests like Brinell, Vickers, and Rockwell and the key parameters for each test. It also includes 2 short answer questions: 1) calculating Brinell hardness number and tensile strength from a Brinell test, and 2) determining compression loads required to compress a metal specimen to given heights using flow curve parameters from a tensile test. The assignment tests understanding of different hardness tests and ability to apply material properties concepts.

Uploaded by

Sourav Kayal
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
209 views1 page

Assignment 1

This document describes an assignment on hardness testing. It includes 10 multiple choice questions testing knowledge of different hardness tests like Brinell, Vickers, and Rockwell and the key parameters for each test. It also includes 2 short answer questions: 1) calculating Brinell hardness number and tensile strength from a Brinell test, and 2) determining compression loads required to compress a metal specimen to given heights using flow curve parameters from a tensile test. The assignment tests understanding of different hardness tests and ability to apply material properties concepts.

Uploaded by

Sourav Kayal
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 1

Assignment V: Hardness Testing

Total marks: 30

1. Choose the correct answer/alternative of the following 1X10 = 10


I. A carbon steel having Brinell Hardness number 100 should ultimate tensile strength
closer it
(a) 100 N/mm2 (b) 200 N/mm2 (c) 350 N/mm2 (d) 1000 N/mm2
II. A measure of Rockwell hardness is the
(a) Depth of penetration of indenter (b) Surface area of indentation
(c) Projected area of indentation (d) Height of rebound
III. Which of the following would you prefer for checking the hardness of very thin sections?
(a) Hebert cloud burst test (b) Shore's Scleroscope
(c) Knoop hardness test (d) Vickers hardness test
IV. A measure of Brinell Hardness is the
(a) Depth of penetration of indenter (b) Surface area of indentation
(c) Projected area of indentation (d) Height of rebound
V. What kind of indenter is used in a Brinell hardness test?
(a) Diamond cone (b) Steel ball (c) Pen dot (d) Long tube
VI. For how long is the load maintained in a Brinell hardness test?
(a) 2-4seconds (b) 10-15seconds (c) 20-30seconds (d) 40-50seconds
VII. How does the Vickers Hardness Test is differ from Brinell Hardness
(a) Type of indenter (b) Duration of time
(c) Materials to be tested (d) Applied load
VIII. What is the angle of indenter in Vickers Hardness Test?
(a) 960 (b) 1100 (c) 1360 (d) 1500
IX. What is the load that the Vickers Hardness Test can carry?
(a) 10 kg (b) 120 kg (c) 150 kg (d) 3000 kg
X. Hardened steel is tested on the C scale with ____ indenter and a ____ kg major load.
(a) Diamond, 100 (b) Diamond, 150
(c) 1.6 mm steel ball, 100 (d) 1.6 mm steel ball, 150

2. In a Brinell hardness test, a 1000-kg load is pressed into a specimen using a 10-mm-diameter
hardened steel ball. The resulting indentation has a diameter = 3.4 mm. (a) Determine the Brinell
hardness number for the metal. (b) If the specimen is steel, estimate the tensile strength of the
steel. 10
3. A metal alloy has been tested in a tensile test with the following results for the flow curve
parameters: strength coefficient =530.8 MPa and strain-hardening exponent = 0.28. The same
metal is now tested in a compression test in which the starting height of the specimen = 75 mm
and its diameter = 30 mm. Assuming that the cross section increases uniformly, determine the
load required to compress the specimen to a height of (a) 62.5 mm and (b) 25 mm. 10

You might also like