crack | R Documentation |

A dataset containing the average normalized crack depth for photovoltaic backsheets with inner layers of either ethylene-vinyl acetate or polyethylene exposed to 4,000 hours of continuous UVA irradiance with an intensity of 1.55 w/m2 at 340 nm and a chamber temperature of 70 deg C. Mechanistic variables from Fourier transform infrared spectroscopy are included to track chemical changes in the materials related to cracking. See the journal article titled 'A Non-Destructive Method for Crack Quantification in Photovoltaic Backsheets Under Accelerated and Real-World Exposures' in Polymer Degradation and Stability for more details. Doi: 10.1016/j.polymdegradstab.2018.05.008

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data(crack)
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A data frame with 97 rows and 5 variables:

- dAvgNorm
Average crack depth normalized by the backsheet's inner layer thickness

- uva360dose
Integrated, cumulative photodose for all wavelengths less than 360 nm

- crys730
Percent crystallinity calculated from the ratio of CH2 rocking peaks at 731 and 720 cm-1

- carb1715
Ketone carbonyl index calculated as the ratio of intensities at 1715 and 2851 cm-1

- carbPC1
1st principal component score from the carbonyl region (1500-1800 cm-1)

Addison G. Klinke, Abdulkerim Gok, Laura S. Bruckman, Roger H. French

Solar Durability and Lifetime Extension (SDLE) Research Center, Case Western Reserve University

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