lab2 report

lab2 report - BIOMEDICAL ENGINEERING School of Engineering...

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BIOMEDICAL ENGINEERING School of Engineering EGRB 310: Biomechanics Lab No. 2: Material Testing System: Software Due : October 10, 2007 Section : 002- Weds 1:00-3:50 PM Honor Pledge: Our signatures attest that each lab partner within our group contributed equally to and is well versed in all parts of this report. _____________________________________________ _____________________________________________
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This laboratory was designed to show students how to use the software that operates the Materials Testing System (MTS). The software was shown to the students, and the process of calibration of the extensometer and load cell, how to test a material using developed methods, and analyzing data and graphs from the testing were explained. The pieces of equipment used in this laboratory were the MTS and the extensometer. Significant results obtained were the graph showing the extension of the crosshead at three different speeds and the graph showing load vs. extension when a test load was applied. These results showed us that the crosshead moves at approximately the correct rate specified in the protocol and that the software could calculate modulus of elasticity, fracture strength and yield strength. Nomenclature dD change in displacement dt change in time v(t) velocity as a function of time Y yield strength or stress F fracture strength or stress M point 1 of modulus of elasticity calculation B point 2 of modulus of elasticity calculation Objective The objective of this laboratory was to become introduced to the software that is used to operate the MTS frames used in general material testing. The students learned how to calibrate the extensometer and load cell, run an experiment using developed methods and analyze the data and graphs. The students had additional practice using the extensometer and the MTS frames. Theory System transducers need to be calibrated each time the frame is turned on, or if it is suspected that there are accuracy problems with it. Recalibration makes certain that the transducer is responding properly and has the proper voltage or current value set to the proper calibration value. Both the load cell and the extensometer are transducers for this system. The load cell was calibrated with no load attached to it to give a “zero reference”. The extensometer has a frame that allows for its calibration. This frame marks where to attach the extensometer for the zero reference and for another reference in order to correctly calibrate it. The modulus of elasticity can be determined in a material that has a load applied. The modulus is calculated by finding two points in the linear-elastic portion of the graph
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lab2 report - BIOMEDICAL ENGINEERING School of Engineering...

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