http://dap.cooper.edu/ 2026-06-15T13:28:17-04:00 http://dap.cooper.edu/ http://dap.cooper.edu/lib/images/favicon.ico text/html 2012-10-11T20:28:32-04:00 http://dap.cooper.edu/doku.php?id=start:projects:mechanical_loaderdale:mechanicaltester:help:combined&rev=1350001712&do=diff <http://www.youtube.com/watch?feature=player_embedded&v=3KpdLJiveE0> The combined test runs a creep test, then immediately transitions into an SRL test followed by dynamic loading. The sample thickness is updated between tests so that for example, the SRL test increments 10% of the creep test compressed thickness. On saving the data, Ey, and G* modului are calculated and placed into the CSV data file. text/html 2012-10-11T20:27:56-04:00 http://dap.cooper.edu/doku.php?id=start:projects:mechanical_loaderdale:mechanicaltester:help:creep&rev=1350001676&do=diff The creep test loads a sample a given amount then maintains the load while monitoring a increase in position. Parameters Load Limit: the target load for the creep test Time to Run: Total time, including initial loading, the test will run. Known Issues The motor will tend to bounce going in and out while attemping to maintain the load. Changing the min PWM in advanced settings may fix this. The time isn't the time to hold the given load, it is a total time. The motor could leave the LVDT … text/html 2012-10-11T20:28:16-04:00 http://dap.cooper.edu/doku.php?id=start:projects:mechanical_loaderdale:mechanicaltester:help:dynamic&rev=1350001696&do=diff <http://www.youtube.com/watch?feature=player_embedded&v=Y9fP-W4f_rU> Parameters Frequency: frequency of movement Strain Increments: Peak to trough amplitude. What percentage of the sample thickness to extend the motor shaft by on each step. The starting point is the position of the motor when the run test button is pressed. text/html 2012-10-11T20:06:36-04:00 http://dap.cooper.edu/doku.php?id=start:projects:mechanical_loaderdale:mechanicaltester:help:lvdtcal&rev=1350000396&do=diff The LVDT constant relates the change in voltage signal from the LVDT to the change in position. This constant can be found using the built in LVDT calibration window. * Measure a point between the motor and a stationary point on the tester * Enter the distance into the LVDT calibration window * Move the motor * Measure the same to points * Enter the new distance into the window * etc.. text/html 2012-10-11T20:27:36-04:00 http://dap.cooper.edu/doku.php?id=start:projects:mechanical_loaderdale:mechanicaltester:help:srl&rev=1350001656&do=diff <http://www.youtube.com/watch?v=rZ6hLZXOa-c> The SRL test moves the motor out a given percentage of a sample's thickness then measures the decrease over time in the load. Parameters Sample Thickness: in mm Diameter: Only used in combined test for Ey and G* calculations