Compressive Creep in LDPE Under Controlled and Varying Ambient Temperature and Humidity
Description
These data are measurements of compression of low-density polyethylene (LDPE) test samples under a nominal static load of 2775 PSI. A compressive force of 1200 lbs is applied axially to cylindrical samples which rapidly compress in the axial direction and expand radially; after 1000min, the radial expansion is assumed to stop, and the nominal static load is determined based on the cross-section area at that time point. Data is included for six samples, three under 24-hour per day and 7-day per week room air conditioning, and three where the air-conditioning was turned off overnight and on weekends. The data includes travel, the measure of axial compression of the test sample, as well as the temperature and humidity experienced by the sample. Samples 29, 30a, and 30b had full air conditioning, while samples 11, 13, and 15 had intermittent air-conditioning. Data for samples that had full air conditioning have lower resolution travel measurements because we did not have full access to the air-conditioned space and a lower resolution automatic data logging sensor had to be used. For sample 13, we also include data on the radial diameter of the sample based on measurements taken from digital photos of the experiment. The data is presented here as a .csv file. We observed segmentation in the travel vs time data for the experiments where temperature and humidity varied. Experiments run under full air conditioning do not appear to have segmentation. In the Results in Engineering journal article “A Discrete Event Simulation Model of Compressive Creep for LDPE” (doi.org/10.1016/j.rineng.2025.103925) we discuss the details of these experiments and propose a model to describe the segmented travel behavior.
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Steps to reproduce
LDPE test samples were produced using a Golomb Mix Molder system. A custom-made creep test rig was used to measure travel vs time data. A digital temperature and humidity logger recorded those data. Details on the experimental setup can be found in the Results in Engineering journal article “A Discrete Event Simulation Model of Compressive Creep for LDPE” (doi.org/10.1016/j.rineng.2025.103925). In the journal article, the authors normalize the travel data by subtracting the travel measurement at the 1000 minute mark from all other travel measurements on a particular sample.
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Funding
Lamar University Center for Midstream Management and Science