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    I did an experiment to find ot how the strain in a loaded perspex tensile specimen varied with time.

    i loaded the specimen with a 40lb load and then measured the strain every 20 seconds for a five min period. i did not add or remove any more loads during this period. here are my results.


    Time (s) Strain
    0 7.69E-06
    2 7.78E-06
    40 7.86E-06
    60 7.86E-06
    80 7.94E-06
    100 8.02E-06
    120 8.10E-06
    140 8.10E-06
    160 8.18E-06
    180 8.26E-06
    200 8.26E-06
    220 8.26E-06
    240 8.34E-06
    260 8.34E-06
    300 8.34E-06

    as you can see it tends to increase but for some time it stays constant. do you have any idea why it increases and sometimes stays constant? i need to explain what the cause of this behaviour is.

    thanks in advance.
 
 
 
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