Lab_6_rough_draft

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School

University of Akron *

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Course

300

Subject

Material Science

Date

Dec 6, 2023

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docx

Pages

4

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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
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