Material Analysis
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Creep deformation of styrene-acrylonitrile copolymer products
Problem Phenomenon
The product deforms slowly under long-term continuous load, affecting long-term service performance and dimensional stability.
Cause Analysis
(1) Styrene-acrylonitrile copolymer is an amorphous material, and slow creep still occurs below the glass transition temperature
(2) The product bears continuous load; the longer the time, the greater the deformation
(3) High service environment temperature accelerates creep
(4) Product wall thickness is insufficient, and stress per unit area is large
(5) Material molecular weight is low, and creep resistance is poor
Solution
(1) Increase product wall thickness or reinforcing ribs to reduce stress per unit area
(2) Select high molecular weight grades to improve creep resistance
(3) Lower the service temperature, staying away from the glass transition temperature
(4) Consider creep in design, reserving deformation allowance
(5) Add glass fiber reinforcement if necessary
Key Takeaway
Creep is the slow deformation of amorphous materials under continuous load.
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