Prelab-Shear Intro(1)

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University of Massachusetts, Lowell *

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2960

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Mechanical Engineering

Date

Apr 3, 2024

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docx

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1

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Shear Testing Introduction: In preparation for our upcoming lab, you will combine what you have learned in our tensile tests and our DIC labs to analyze a sample loaded in shear. To prepare for this lab, you are required to review the lab manual and perform a preliminary analysis of sample data. This pre-lab assignment aims to familiarize you with the sample geometry and analysis requirements as well as confirm your ability to measure strain using images using GOM correlate. This exercise will help you gain a better understanding of the practical aspects of materials testing. Instructions: Review the Lab Manual: Begin by thoroughly reviewing the lab manual provided for the upcoming experiment. Pay special attention to the objectives, procedures, and any theoretical background related to stress and strain analysis. Understanding the context and purpose of the experiment is essential before proceeding. For this prelab, we will be working on data that has already been gathered by your TA. Sample Data Analysis: Using the attached data, perform the following analysis. As a note, if you had difficulty gathering data for the tensile sample, you should pay close attention to the data from the next lab, as your DIC data will play a more important role in this lab due to the small geometry of the sample! a. Preparation: Import the sample into GOM correlate and using the same techniques as last lab prepare the sample for analysis. b. Using GOM correlate determines the lateral and axial strain for the sample. Remember for this sample we are only considering the smaller internal geometry! c. Additionally, determine the shear angle for the elements in the concerned area! (Inspection->Check Dimension->Angles->Shear Angle) Interpretation : What information does this tell us about the behavior of this material? What can it not tell us. What is the benefit of this optical method versus the gauge-based system we used in our last lab? What are the drawbacks of this method? Questions : In your one-page assignment, briefly answer the following questions: a. What did you learn from the sample data analysis? Were there any unexpected findings or patterns? b. How could you use this information along with a shear stress/strain data set to determine the Poisson’s ratio of the sample? c. How do you think these concepts and skills will be useful in the upcoming lab? Submission: Please submit your completed assignment, including the data table, along with your written responses to the questions. This pre-lab assignment is due before the lab session, and it will serve as a foundation for our practical work in lab.
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