Stress and Strain. Lab 4. To understand how engineers compare different materials. To understand how a strain gage works. To understand important issues for data acquisition. To understand the need for experimental data. To understand some basic structural features of a bicycle.
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To understand how a strain gage works.
To understand important issues for data acquisition.
To understand the need for experimental data.
To understand some basic structural features of a bicycle.
To make measurements on a statically loaded bicycle.
To understand why different materials are used to make bicycles.Objectives
Data Acquisition System
quantity to measurable electrical
Records amplifier output. Recorder may be analog or digital
Converts transducer output to electrical signal to be amplified
Computer analysis, display graphs, tables
Measured Quantity: strain
Measurable Electrical Quantity: resistance.
The strain gage is cemented to the bicycle fork. When the bicycle is loaded the fork is strained and the strain gage resistance changes.
Solder tabsTransducer: Strain Gage
The change in the output voltage from the Wheatstone Bridge is related to the strain of the strain gage by:
Vin = 5.0 volts
A = 500 (amplification)
Sg = 2.085 (gage factor)
The equation can be solved to give the strain as a function of the output voltage.Conditioning Module: Wheatstone Bridge