Development of a LabView Development of a LabView Interface for - PowerPoint PPT Presentation

Development of a LabView Development of a LabView Interface for CSEM POD Interface for CSEM POD Tribological Studies of AFRL Tribological Studies of AFRL “Chameleon Chameleon” ” Coatings Coatings “ Jason Kostelnik Jason Kostelnik DeMatha Catholic High School DeMatha Catholic High School AFOSR EF- -MURI @ NCSU MURI @ NCSU AFOSR EF NRL, Code 6176 NRL, Code 6176 Richard Chromik and Kathryn Wahl Richard Chromik and Kathryn Wahl

Chameleon Coatings Chameleon Coatings • What is tribology? What is tribology? • • What is a coefficient of friction? What is a coefficient of friction? • µ =Ff/Fn Equation: µ • Equation: =Ff/Fn • • What are Chameleon Coatings? What are Chameleon Coatings? • • Composition: Gold, DLC, and MoS2 Composition: Gold, DLC, and MoS2 •

Project Tasks Project Tasks • Create a flexible Create a flexible • program to measure program to measure friction on the friction on the chameleon coatings chameleon coatings and analyze the results and analyze the results • Set up the tribometer Set up the tribometer • • How does the humidity How does the humidity • affect the coefficient of affect the coefficient of friction? friction?

POD Tribometer POD Tribometer • Calibration Calibration • • Environment Setup Environment Setup • • Input: Input: • • RPM RPM • • Number of Cycles Number of Cycles • • Output: Output: • • Voltage Voltage •

Data Acquisition Program Data Acquisition Program • Instrument Setup and LabView Instrument Setup and LabView • • Test Parameters Test Parameters • • Acquired Data: Tribometer and Hygrometer voltages Acquired Data: Tribometer and Hygrometer voltages • •POD POD •Hygrometer Hygrometer • • •DAC DAC • •Computer + Program Computer + Program •

Analysis Program Analysis Program • Determining the Actual Starting and Ending Points Determining the Actual Starting and Ending Points • • The Key Feature: Cycle Averaging and Standard The Key Feature: Cycle Averaging and Standard • Deviation Deviation

Results Results • Test results of first test on coating CHM1 Test results of first test on coating CHM1 • • Check analysis program to assure the proper Check analysis program to assure the proper • numbers were calculated numbers were calculated Steady State Steady State Friction Friction

Results Results • Lower friction coefficient when run at low humidity Lower friction coefficient when run at low humidity • • Smaller wear track widths when run at low humidity for Smaller wear track widths when run at low humidity for • high gold content sample high gold content sample • Wear tracks are nearly the same for other samples Wear tracks are nearly the same for other samples •

• Eight Tests in total on three coatings Eight Tests in total on three coatings The Tests • The Tests • Wear Tracks and Transfer Films Wear Tracks and Transfer Films • High Humidity (~34%) High Humidity (~34%) CHM 1-1 at 10x CHM 1-1 at 10x 100 um 100 um High Humidity High Humidity Low Humidity Low Humidity CHM 4: Wear Tracks 1, 4, and 2 from top to bottom Low Humidity Low Humidity 5mm

Conclusions Conclusions • Both of the programs Both of the programs • and the tribometer and the tribometer function properly function properly • Lower Friction Lower Friction • Coefficient on every Coefficient on every sample when run at sample when run at low humidity low humidity • Track widths smaller Track widths smaller • at low humidity on the at low humidity on the high gold sample, high gold sample, otherwise, they are otherwise, they are nearly the same nearly the same