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Transcript of Lab #1 Report due TODAY Individual Data Processing and Individual Write Up Lab #1 Report is due...
![Page 1: Lab #1 Report due TODAY Individual Data Processing and Individual Write Up Lab #1 Report is due TODAY by midnight Answer Multiple Choice Questions ONLINE.](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649dc85503460f94abe9d1/html5/thumbnails/1.jpg)
Lab #1 Report due TODAY Individual Data Processing and
Individual Write Up Lab #1 Report is due TODAY by
midnight Answer Multiple Choice Questions
ONLINE TODAY by midnight Answer Student Survey ONLINE TODAY
by midnight Submit the Lab Report #1 in the drawer
labeled “MECE204 - Strength Lab” under Mech. Engg. Mail Folders
![Page 2: Lab #1 Report due TODAY Individual Data Processing and Individual Write Up Lab #1 Report is due TODAY by midnight Answer Multiple Choice Questions ONLINE.](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649dc85503460f94abe9d1/html5/thumbnails/2.jpg)
Tensile Testing: Objectives Learn elastic and plastic behavior of metallic
materials in monotonic tension Learn the use of Tinius Olsen 120 kips UTS and clip-on
extensometer Conduct tensile testing experiment on 1018 steel and
2024 aluminum alloy Determine quantitatively elastic and tensile
mechanical properties Determine qualitatively the material’s failure mode Become familiar with ASTM E-8 Standard Submit a professional lab report with abstract, data,
graphs, and discussion Answer multiple-choice questions and student survey
ONLINE using MyCourses
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Tensile Properties
Quantitative determination of Elastic Modulus, E Proportional Limit, PL
0.2% Offset Yield Strength, Y
Tensile Strength, TS
% Elongation to Failure, %f
Modulus of Toughness, Atotal
Qualitative study of Failure
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Stress and Strain
PP B
P FB
r
(a) Tension-Test Specimen
Figure 1.1 Tension-test Specimen (a) Axially Loaded and (b) Cross-Section at B
(b) Cross-Section at B
A
F
L
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Engineering Stress-Strain Curve
, psi
, in/in
u
f
y
ElasticRegion
PlasticRegion
Yield Region
Figure 1.3 Stress-Strain Diagram, Labeled
Elastic Deformation
Uniform Plastic Deformation
Non-uniform Plastic Deformation
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Actual Experimentation
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0.2% Offset Yield Strength
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Modulus of ResilienceModulus of Toughness
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Necking begins at maxima
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Shape of Necked Region
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Engineering vs. True Stress-Strain
Engineering Stress = e = P / A0
True Stress = t = P / Ai
Engineering Strain = e = / L0 = (Li – L0) / L0 implies Li = L0 * (1 + e)
Assume volume is constant until necking: A0*L0 = Ai*Li Ai = A0/(1+e)
True Stress = t = P / Ai = P (1 + e) / A0 = e (1 + e)
True Strain = t = (dL)/L = Ln(Li / L0) = Ln (1 + e)
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Comparison
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Ductile vs. Brittle Failure
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Fracture Surfaces
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Testing Equipment
Universal Testing Machine (UTM) Tension, Compression and Flexure
Monotonic Static Tension Test Single direction, Load increased slowly
Crosshead Motion Motor-driven Screw Hydraulically-driven Crosshead
ASTM Standards: E8
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Testing Methods
Displacement Control Open loop, Most Common
Load Control Close Loop Feedback, Expensive
Strain Control Close Loop Feedback, Expensive
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Data Sheet
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Data Sheet (continued)
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Demonstration
Perform the tensile testing experiment on
1018 Cold Rolled Steel
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Data Sheet (continued)
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Lab #1 Report due TODAY Individual Data Processing and
Individual Write Up Lab #1 Report is due TODAY by
midnight Answer Multiple Choice Questions
ONLINE TODAY by midnight Answer Student Survey ONLINE TODAY
by midnight Submit the Lab Report #1 in the drawer
labeled “MECE204 - Strength Lab” under Mech. Engg. Mail Folders