Lab - Threaded Fasteners and Shear Strength Lab Report Template Fall 2022-1.rev1 (1)

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School

Colorado State University, Fort Collins *

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Course

251

Subject

Mechanical Engineering

Date

Dec 6, 2023

Type

docx

Pages

3

Uploaded by MagistrateMink1743

Report
CON 251 Materials and Processing Laboratory # Laboratory Title Submitted by: Your name Submitted to: Dr. Fantz Group and Lab Section (Wednesdays 11:00-12:40 PM) Laboratory Performed on (e.g. January 27, 2022) Report submitted (e.g. February 1, 2022)
Introduction: What were the goals of the lab, materials tested, apparatus used, and how was the experiment was performed? Data: This section should include your shear test results: Shear Strength = Load @ Rupture 2X Cross Sectional Area of Bolt Note 1: The shear strength of a fastener is equal to approximately 80% of its rated tensile strength value. Note:2 Cross sectional areas through the threads are: Area of a ¼-20 UNC: 0.0318 sq. in. Area of a ¼-28 UNF is 0.0364 sq. in. Sample #1 Type and Grade 1 & 2 or A307 Carriage Bolt Area Peak Load at Rupture Shear Strength psi. Listed Tensile Strength of this fastener ksi Approximated shear strength value ksi Sample #2 Type and Grade Grade 5 or A325 Area Peak Load at Rupture Shear Strength psi. Listed Tensile Strength of this fastener ksi Approximated shear strength value ksi Sample #3a Type and Grade Grade 8 or A490 Through threads
Area Peak Load at Rupture Shear Strength psi. Listed Tensile Strength of this fastener ksi Approximated shear strength value (80% of listed tensile strength) ksi Sample #3b Type and Grade Grade 8 or A490 Through Body Area Through the body (use calipers and calculate) Peak Load at Rupture (Through the body) Shear Strength psi. (Through the body) Listed Tensile Strength of this fastener ksi Approximated shear strength value (80% of listed tensile strength) ksi Analysis and Discussion: How close did your shear values agree with the approximation using 80% of tensile strength? What is the peak load gained by using Sample #3 Screw’s body instead of the threads? How would you use this information when ordering cap screws to attach a ½” thick bracket to an I-beam? Conclusions: Are your results what you expected? Do you believe there were errors in the lab that may have affected the results? If you were to perform the lab again, what would you do differently?
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