Material Analysis
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Creep deformation of polystyrene products
Problembeschreibung
Products slowly deform under long-term continuous load, affecting long-term use performance and dimensional stability.
Ursachenanalyse
(1) Polystyrene is an amorphous material; slow creep still occurs below the glass transition temperature
(2) Products bear continuous load; the longer the time, the greater the deformation
(3) High use environment temperature accelerates creep
(4) Insufficient product wall thickness, large stress per unit area
(5) Low material molecular weight, poor creep resistance
Lösung
(1) Increase product wall thickness or ribs, reduce stress per unit area
(2) Select high molecular weight grades, improve creep resistance
(3) Reduce use temperature, stay away from the glass transition temperature
(4) Consider creep amount in design, reserve deformation allowance
(5) Add glass fiber reinforcement when necessary
Wichtigste Erkenntnis
Creep is the slow deformation of amorphous materials under continuous load.
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