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 ans1 <- netSEMp1(crack) ## Plot the network model for principle 1 plot(ans1, cutoff = c(0.4, 0.5, 0.6)) ## Run netSEMp2 model ans2 <- netSEMp2(crack) ## 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 pathwayRMSE()
function.
knitr::include_graphics("crack1.png")
knitr::include_graphics("crack2.png")
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.
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