Extrapolation software according to ISO 9080
This standard describes a method
for estimating the long-term hydrostatic strength of thermoplastics materials
by statistical extrapolation. The method provides a systematic basis for the
interpolation and extrapolation of stress rupture characteristics at operating
conditions different from the conventional 50 years at 20°C.
This extrapolation method is designed to meet the
following two requirements:
to estimate the lower prediction limit (at 97,5% of
probability level) of the stress, which a pipe made of the material under
consideration is able to withstand for 50 years at an ambient temperature of
20°C using water as test environment
estimate the value for the lower prediction limit (at 97,5% of probability
level) of the stress, at either different times or different temperatures, or
on occasion both.
A software package has been
developed according to the ISO 9080 analysis (standard extrapolation method).
It is recommended to use this software package.
The graph shows
the result of a SEM analysis whether a knee (which demonstrates the transition
between ductile and brittle crack behaviour) is found or not.
The final result of the SEM
(standard extrapolation method) for a specific material is the lower prediction
limit (at 97,5% of probability level) of the
hydrostatic strength, expressed by the hoop stress, at a given time and given
The SEM software runs on PC
with Windows operating system. The hardware requirements are minimal, any PC
able to run Windows operating systems may run the SEM program (suitable for
Windows 7, 8, 8.1, 10).
This software package maybe ordered at Becetel®.
For information, . For registration, complete the
registration form available on www.iso9080semdisk.com/register. After receipt of the
registration, an invoice will be issued. When we receive proof of payment, you will be
informed with a username and password, with which you may download the software.
Open a new data file and fill in the available data or
data may be imported, e.g. from Excel, when in suitable format (1st column
temperature, 2nd column hoop stress, 3rd column failure time).
Results (Predictions – Knee position)
The current version of the software (SEM v3.4) is valid from 1/01/2019 until 13/12/2021.