Lab_6_rough_draft
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University of Akron *
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300
Subject
Material Science
Date
Dec 6, 2023
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docx
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Uploaded by SuperHumanExplorationCrane35
Introduction to Material Technology Laboratory Report
Lab Course Number &
Instructor
2920:142-***
Instructor Use
Author
William Korecky
Team Number
Team 4
Grade
Lab Activity Number & Title (Draft or Final)
Lab 6 Rough Draf
Date Submitted
3/31/2020
Description Measure the diameter of a number of bolts, observe and record the grade of each, and using the universal testing machine, determine
the shear force for each specimen. Calculate the shear stress and compare to known values.
Procedure
1) Use the double shear fixture on the Universal Testing Machine to find the load to fracture for the 4 bolts supplied. 2) Measure the shank (non-threaded portion) diameter, D, of each bolt before testing. 3) Insert the bolt into the fixture as shown by the instructor. 4) Make sure that the protective see through cover is in place prior to applying any load. 5) Make sure the needles are properly positioned, so the maximum load can be determined. 6) Gradually rotate the handle to the hydraulic pump until fracture occurs.
7) Record the force at fracture.
8) Calculate the ultimate shear strength
9) Estimate the ultimate shear strength from the bolt’s minimum tensile strength 1
Results Bolt
D (inches)
A (in^2)
Fu (lbs)
Grade 2
.247
.048
4,700
Grade 5
.245
.047
7,100
Grade 8
.247
.048
8,400
Stainless Steel
.243
.046
6,900
Bolt
Grade 2
Grade 5
Grade 8 Stainless Steel
Tus Calculated (lbs)
48,958
75,532
87,500
75,000
Tus Estimated (lbs)
55,500
90,000
112,500
48,750
Pictures:
Formulas
Calculated:
Estimate
:
2
Conclusions
The relative order of shear strength among the specimens are similar among the experimental data and the reference table. There are slight differences because the table has minimums rather then the data from the test itself. The Estimated is always higher because it isn’t from an actual test and is based off theoretical numbers, but the calculated is within an appropriate range. The trends are also normal as the bolt grade goes up, there is a linear like increase in the amount of shear strength it takes to shear the bolt.
References https://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspxa
Appendices
3
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