Hello and welcome to a new post. Today we discuss another set of multi-point design data: the brittleness as a function of temperature for amorphous and semi-crystalline thermoplastics.
In general, the impact strength of thermoplastics is highly dependent on the testing temperature. Brittle behavior, together with notch sensitivity, occurs mainly at lower temperatures. Figure 1 helps you during material selection to reject certain polymers since they are not fulfilling the lowest service temperature of the application.
Polycarbonate and Polyamide (conditioned) are able to withstand a break even when the specimens are sharply notched. PMMA on the other side shows over the whole temperature range a brittle behavior even when unnotched.
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| Figure 1: brittleness as a function of temperature for amorphous and semi-crystalline thermoplastics [1] |
More multi-point design data you can find here
Greetings and #findoutaboutplastics
Herwig
Literature:
[1] A.A. Collyer: A practical guide to the selection of high-temperature engineering thermoplastics, Elsevier, 1990
ReplyDeleteHello!!
Useful blog. thank you for sharing with us.
tractor