MET 21100 Lab Week 1 Activity

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Purdue University *

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21100

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Mechanical Engineering

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Dec 6, 2023

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docx

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MET 21100 Lab Week 1 Activity WL1 – 50 lab points EXPLORING DIRECT STRESSES AND AXIAL DEFORMATIONS Lab date: Lab day and time: Group member names: Comments & Observations: In reality the glue on the popsicle sticks would not be a perfect circle so there would be more glue than what we are assuming. Along with that we never physically tested if they would break at the given shear failure force. None of our tests were repeated as well so there is not proven repeatability. The cuts on the pool noodle were also not parallel with each other which creates inconsistencies in where the weight was dispersed and was measured using nonoptimal techniques which could cause slight error.
MET 21100 Lab Week 1 Activity WL1 – 50 lab points EXPLORING DIRECT STRESSES AND AXIAL DEFORMATIONS Objectives: 1) Determine the compressive direct normal (axial) stress present in a short foam tube. 2) Use the measured axial deformation, geometry, and mass  load on the tube to estimate the modulus of elasticity of the foam 3) Consider the effect of increased shear area on load capacity of a glued joint under simple shear loading 4) Review use of micrometer and dial calipers, and mass to weight conversions Mate rials: dial calipers micrometer calipers steel rule(if needed) dowel rod calculator (if needed) glued craft sticks (single/double) tubing piece masses (share as needed) Directions: A. Tube compression experimental work 1. Use the dial calipers to measure the inside and outside diameters of the foam tube at 3-5 locations, being careful to avoid compressing the tube. Record the average diameter values. 2. Stand the tube on the table. Measure and record the height (length) in inches, to at least two significant figures. 3. Carefully place a known mass on top of the tube. (Use a dowel rod for vertical support, if needed). Measure and record the height to at least two significant figures. B. Tube compression calculations 1. Direct normal (axial) stress= (Force)/(Perpendicular Area) or Ơ = F/A Convert the top mass from grams to force in Newtons, then convert the force value from Newtons to Pounds-Force. Calculate the cross-sectional area of the tube, then find the tube stress in psi (pounds per square inch). 2. Estimate the modulus of elasticity E of the foam material from its axial deformation δ. The stress and strain equations can be manipulated to give E = Ơ L/ δ, in psi (and E= FL/A δ). C. Single and Double Direct Shear experimental work 1. Measure the width of one craft stick using a micrometer at 3-5 places along its length. Record the average value. (Each group member should check one craft stick width to verify consistency in width values and review micrometer use). 2. Pick up the single shear stick combination. Two group members will pull along the length of the sticks until the adhesive fails. 3. Pick up the double shear stick combination. The same two group members will pull along the length of the sticks until the adhesive fails.
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