A dataset of cracks in 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 \(w/m^2\) at 340 \(nm\) and a chamber temperature of 70\(^\circ\)C. See the associated journal article in Polymer Degradation and Stability for details on obtaining quantitative crack measurements [@klinke_2018_non-destructive].
97 observations of 5 variables are included:
## Load the crack data set and preview column metadata data(crack) ?crack ## Run netSEMp1 model <- netSEMp1(crack) ans1 ## Plot the network model for principle 1 plot(ans1, cutoff = c(0.4, 0.5, 0.6)) ## Run netSEMp2 model <- netSEMp2(crack) ans2 ## Plot the network model for principle 2 plot(ans2, cutoff = c(0.4, 0.5, 0.6))
dAvgNorm is the endogenous and all other variables are considered as
exogenous. Based on the plot, the strongest pathway appears to be
uva360dose \(\rightarrow\) carb1715
\(\rightarrow\) dAvgNorm. This can be
confirmed using the
Huang, J. B., J. W. Hong, and M. W. Urban. “Attenuated Total Reflectance Fourier Transform Infra-Red Studies of Crystalline-Amorphous Content on Polyethylene Surfaces.” Polymer (1992) 33: 5173–78. https://doi.org/10.1016/0032-3861(92)90797-Z.
Klinke, Addison G, Abdulkerim Gok, Silas I Ifeanyi, and Laura S Bruckman. “A Non-Destructive Method for Crack Quantification in Photovoltaic Backsheets Under Accelerated and Real-World Exposures.” Polymer Degradation and Stability (2018) 153: 224–54. https://doi.org/10.1016/j.polymdegradstab.2018.05.008.