Under room/dry condition, usually 4% porosity is not a big issue on mechanical strength. However, if your part is going to use in high moisture or hygrothermal condition, it is definitely a very critical issue. As RPstress said, cure a thick part in out-of-autoclave usually have higher porosity...
Thank you Demon3 and Compositepro for the explaination.
In addition to that, do you know who is moisture effect on subTg determination? I'd been told by someone that moisture has no effect on DSC's results, I wonder if it is right or not?
That is right. However, as mentioned by RPstress, there are certain requirements for every specific test. You should comply with ASTM standards before testing to obtain the best result. If I am not wrong, you need to meet geometry and tabbing requirements. In addition, the fiber alignments are...
I am perfoming subambient Tg test on a thermosetting prepreg. However, I am not clearly understand what happen to the prepreg at extremely cold temperature ? and what happen to the prepreg when heating up from cold temperature to room temperature.
This is what I know:
At extremely cold...
Hi midsidenode,
Yes, mechanical properties of lamina could be derived from the testing cured laminate. However, it is depending on the stack sequence of your laminate. Generally, to derive mechanical properties for lamina, the laminate usually layup in unidirectional then test in the desired...
