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Polypropylene creep curves

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PIPING_DESIGNER

PIPING_DESIGNER

Mechanical
Feb 16, 2021
41
In the diagram of polypropylene creep curves, what is the meaning of the indicated values

EC=140N/mm2, 1N/mm2 and 1000h

creep_rq31mw.jpg
 
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That is the creep modulus, Ec (also "long term modulus of elasticity"). For a given material, it is a function of temperature, applied stress, and time, so that is the value of Ec given those assumptions.
 
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You mean that Ec is the creep modulus at 120°C with an applied stress of 1 N/mm2 during 1000 hours of test ????
 
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