(CS)
?????? ??? (CS) ?? ?????? ?????? ? ??? ??????? ?????? ? ?? ?????? ?????? ???? ???? ??? ????? ????? ????????? ??????. ????? ??? ??? ??????? ?? ???? ????? ? ????? ???? ?????? ??? ?????? ??? ????? ??????. ???? ?????? ?????? ????? ???? ?????? ??? ?????? ??? ????? ?????? ??? ????? ??? ????? ??? ?????? ?????? ????? ?????.
?????: ??? ?????? ?????? ?????
???? ??? ????? ???? ?????? ?????? ???? ???? ?????????. ??? ???? ?????? ? ?? ???? ????? ??? ??????? ? ?? ????? ?????? ??? ????? ?????? ???? ???? ?? ???? ????? ????? ??? ???? CS ???? ???? ?????. ?????? ????? ??? ???? ??????? ?????? ????? ? ???????? ???? ???? CS ???? ? ??? ????? ??? ????? ?????? ????. ???? ?????? ?????
:
?? ??????? ??????? ? ?????? ???? ????? ??? ?????? ??? ????? ?? ?????? ???? ???? ??? 100 ? ?? ????? ?????? ? ?? ??? ?? ?????? ???? ????? ??? ?????? ??? 100 ? ?? ?????? ???? ?? ???? ?? ??? ????.
??? ????? ?????? ????? (ASTM D395) ?????? ???????? ???? ?????? ???????? ? ??????? ????? a ??????? ????? B.
????? ???????? ?:
?????? ??? ??? ??? ????? ?? ?????? ???? ??? 1.8kN ??? ?????? ???? ????? ????? ?????.
????? ???????? B:
?????? ??? ??? ?????? ???? ?? ?????? ???? ??? ?????? ?????? ?????? ??? 25 ? ?? ???????? ?????? ???? ????? ????? ?????.
??? ????? ??????? ????? A ? B ??? ???? ?????? ??????? ???? ?????? ??????? ??? ????? ?? ?????? ??????? ???? 30 ?????.
??? ????? ?????? ?????? ??? ?????? O ???????? ????? ASTM D1414 B ????????.
???? ?????? ?????
??? ???? ?????? ????? ????? ???????? ??? ????? ??? ????? ?? ??? ????????.
????? ???????? A:
CA ? ?????? ????? A ? ????? ?????? CA = [(???-ti) /???] * 100 ??? ???? ??? ?????? ?????? ? ? ti ?? ??? ?????? ??? ????????.
????? ???????? B:
CB ? ?????? ????? B ? ??? ??????? ?????? CB = [(???-ti)/(???-tn)] * 100 ??? ???? ??? ?????? ?????? ? ti ?? ??? ?????? ??? ???????? ? ? tn ?? ??? ?????? ?? ??? ?????? ????? ????????.
????:
??? ?????? = (t0 - ti) = 0.25 - 0.177 = 0.073 (29 ? ???)
??? ???? = (t0 - tn) = 0.221-0.177 = 221 = 0.044
CB = {(0.25-0.0)/(0.25-0.177)}/100 = 39.7%
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