PE pressure pipes made from PE 100-RC - HESSEL ...
PE pressure pipes made from PE 100-RC - HESSEL ...
PE pressure pipes made from PE 100-RC - HESSEL ...
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Failure Modes<br />
log σ [N/mm²]<br />
1. Overview on Failure Modes<br />
ductile<br />
flat ‘branch’<br />
failures through<br />
stretching of material<br />
brittle<br />
2 nd ‘branch’<br />
failures through<br />
stress cracking<br />
Relevant for<br />
service life<br />
<strong>PE</strong> <strong>pressure</strong> <strong>pipes</strong> <strong>made</strong> <strong>from</strong> <strong>PE</strong><strong>100</strong>-<strong>RC</strong><br />
Plastic Pressure Pipes 05.-07.October 2009 | <strong>HESSEL</strong>-Ingenieurtechnik GmbH<br />
log t [h]<br />
<strong>HESSEL</strong><br />
Ingenieurtechnik<br />
thermal ageing<br />
failures independent of<br />
stress level<br />
Onset of thermal ageing<br />
at 80 °C after 1 year*<br />
* DVS directive DVS 2205-1, sup. sheet 19<br />
4
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