{"id":680483,"date":"2024-08-28T21:52:44","date_gmt":"2024-08-28T20:52:44","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=680483"},"modified":"2024-08-28T21:52:44","modified_gmt":"2024-08-28T20:52:44","slug":"phan-tich-co-hoc-dong-luc-dma","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/phan-tich-co-hoc-dong-luc-dma\/","title":{"rendered":"Ph\u00e2n T\u00edch C\u01a1 H\u1ecdc \u0110\u1ed9ng L\u1ef1c (DMA)"},"content":{"rendered":"

Ph\u00e2n t\u00edch c\u01a1 h\u1ecdc \u0111\u1ed9ng l\u1ef1c (DMA): T\u00ecm hi\u1ec3u c\u00e1ch DMA \u0111o v\u00e0 ph\u00e2n t\u00edch t\u00ednh ch\u1ea5t v\u1eadt li\u1ec7u d\u01b0\u1edbi s\u1ef1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 v\u00e0 t\u1ea7n s\u1ed1 thay \u0111\u1ed5i trong l\u0129nh v\u1ef1c c\u01a1 h\u1ecdc.<\/p>\n

\"Ph\u00e2n<\/p>\n

Ph\u00e2n T\u00edch C\u01a1 H\u1ecdc \u0110\u1ed9ng L\u1ef1c (DMA)<\/h2>\n

Ph\u00e2n t\u00edch c\u01a1 h\u1ecdc \u0111\u1ed9ng l\u1ef1c (DMA – Dynamic Mechanical Analysis) l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p quan tr\u1ecdng trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t v\u00e0 v\u1eadt li\u1ec7u, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc c\u1ee7a v\u1eadt li\u1ec7u th\u00f4ng qua vi\u1ec7c \u0111o \u0111\u00e1p \u1ee9ng c\u1ee7a ch\u00fang d\u01b0\u1edbi c\u00e1c \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t kh\u00e1c nhau. DMA gi\u00fap cung c\u1ea5p th\u00f4ng tin v\u1ec1 \u0111\u1ed9 c\u1ee9ng, \u0111\u1ed9 b\u1ec1n v\u00e0 t\u00ednh \u0111\u00e0n h\u1ed3i c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u khi ch\u00fang ch\u1ecbu t\u00e1c \u0111\u1ed9ng c\u1ee7a c\u00e1c l\u1ef1c \u0111\u1ed9ng l\u1ef1c (dao \u0111\u1ed9ng ho\u1eb7c thay \u0111\u1ed5i theo th\u1eddi gian).<\/p>\n

C\u00e1ch Th\u1ee9c Ho\u1ea1t \u0110\u1ed9ng C\u1ee7a DMA<\/h2>\n

DMA \u0111o l\u01b0\u1eddng c\u00e1ch m\u1ed9t v\u1eadt li\u1ec7u bi\u1ebfn d\u1ea1ng khi ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a m\u1ed9t l\u1ef1c \u0111\u1ed9ng l\u1ef1c tu\u1ea7n ho\u00e0n. D\u1ef1a tr\u00ean c\u00e1c ph\u00e9p \u0111o n\u00e0y, ta c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1eb7c tr\u01b0ng c\u01a1 h\u1ecdc nh\u01b0 m\u00f4 \u0111un \u0111\u00e0n h\u1ed3i v\u00e0 h\u1ec7 s\u1ed1 t\u00e1n x\u1ea1 n\u0103ng l\u01b0\u1ee3ng. C\u00e1c b\u01b0\u1edbc c\u01a1 b\u1ea3n trong qu\u00e1 tr\u00ecnh DMA bao g\u1ed3m:<\/p>\n

<\/p>\n

  • \u00c1p d\u1ee5ng m\u1ed9t l\u1ef1c tu\u1ea7n ho\u00e0n l\u00ean m\u1eabu v\u1eadt li\u1ec7u.<\/li>\n
  • \u0110o s\u1ef1 bi\u1ebfn d\u1ea1ng v\u00e0 \u0111\u00e1p \u1ee9ng \u0111\u1ed9ng l\u1ef1c c\u1ee7a v\u1eadt li\u1ec7u.<\/li>\n
  • Ph\u00e2n t\u00edch d\u1eef li\u1ec7u \u0111\u1ec3 t\u00ecm ra c\u00e1c \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc c\u1ee7a v\u1eadt li\u1ec7u.<\/li>\n

    <\/u1><\/p>\n

    Th\u00f4ng S\u1ed1 K\u1ef9 Thu\u1eadt Ch\u00ednh Trong DMA<\/h2>\n

    C\u00e1c th\u00f4ng s\u1ed1 ch\u00ednh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi DMA bao g\u1ed3m:<\/p>\n

    <\/p>\n

  • M\u00f4 \u0111un \u0111\u00e0n h\u1ed3i (E’): <\/b>Bi\u1ec3u hi\u1ec7n \u0111\u1ed9 c\u1ee9ng c\u1ee7a v\u1eadt li\u1ec7u, l\u00e0 t\u1ec9 s\u1ed1 gi\u1eefa \u1ee9ng su\u1ea5t v\u00e0 bi\u1ebfn d\u1ea1ng trong pha. M\u00f4 \u0111un \u0111\u00e0n h\u1ed3i \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c: \\( E’ = \\frac{\\sigma}{\\epsilon} \\) (trong \u0111\u00f3 \u03c3 l\u00e0 \u1ee9ng su\u1ea5t v\u00e0 \u03b5 l\u00e0 bi\u1ebfn d\u1ea1ng).<\/li>\n
  • M\u00f4 \u0111un m\u1ea5t m\u00e1t (E”): <\/b>Bi\u1ec3u hi\u1ec7n n\u0103ng l\u01b0\u1ee3ng b\u1ecb t\u00e1n x\u1ea1 ho\u1eb7c m\u1ea5t m\u00e1t trong qu\u00e1 tr\u00ecnh bi\u1ebfn d\u1ea1ng. <\/li>\n
  • H\u1ec7 s\u1ed1 t\u1ed5n hao (tan \u03b4): <\/b>Bi\u1ec3u hi\u1ec7n s\u1ef1 m\u1ea5t m\u00e1t n\u0103ng l\u01b0\u1ee3ng trong v\u1eadt li\u1ec7u, t\u00ednh b\u1eb1ng t\u1ec9 s\u1ed1 gi\u1eefa m\u00f4 \u0111un m\u1ea5t m\u00e1t v\u00e0 m\u00f4 \u0111un \u0111\u00e0n h\u1ed3i: \\( \\tan \\delta = \\frac{E”}{E’} \\).<\/li>\n

    <\/o1><\/p>\n

    \u1ee8ng D\u1ee5ng C\u1ee7a DMA<\/h2>\n

    DMA c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng quan tr\u1ecdng trong c\u1ea3 nghi\u00ean c\u1ee9u khoa h\u1ecdc v\u00e0 c\u00f4ng nghi\u1ec7p, ch\u1eb3ng h\u1ea1n nh\u01b0:<\/p>\n

    <\/p>\n

  • Ki\u1ec3m tra t\u00ednh \u0111\u00e0n h\u1ed3i v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u ch\u1ebf t\u1ea1o \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9 b\u1ec1n.<\/li>\n
  • Nghi\u00ean c\u1ee9u t\u00e1c \u0111\u1ed9ng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 l\u00ean t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a v\u1eadt li\u1ec7u.<\/li>\n
  • Ph\u00e2n t\u00edch c\u00e1c t\u00ednh ch\u1ea5t \u0111\u1ed9ng l\u1ef1c c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u polymer, composite v\u00e0 kim lo\u1ea1i.<\/li>\n
  • Ph\u00e1t hi\u1ec7n v\u00e0 x\u00e1c \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9 chuy\u1ec3n th\u1ee7y tinh c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u polymer.<\/li>\n

    <\/u1><\/p>\n

    K\u1ebft Lu\u1eadn<\/h2>\n

    DMA l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd v\u00e0 kh\u00f4ng th\u1ec3 thi\u1ebfu trong vi\u1ec7c ph\u00e2n t\u00edch c\u00e1c \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc c\u1ee7a v\u1eadt li\u1ec7u d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t v\u00e0 l\u1ef1c \u0111\u1ed9ng l\u1ef1c. C\u00e1c th\u00f4ng s\u1ed1 nh\u01b0 m\u00f4 \u0111un \u0111\u00e0n h\u1ed3i, m\u00f4 \u0111un m\u1ea5t m\u00e1t v\u00e0 h\u1ec7 s\u1ed1 t\u1ed5n hao kh\u00f4ng ch\u1ec9 gi\u00fap hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 t\u00ednh ch\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u m\u00e0 c\u00f2n \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c c\u1ea3i thi\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c s\u1ea3n ph\u1ea9m trong k\u1ef9 thu\u1eadt nhi\u1ec7t v\u00e0 nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Ph\u00e2n t\u00edch c\u01a1 h\u1ecdc \u0111\u1ed9ng l\u1ef1c (DMA): T\u00ecm hi\u1ec3u c\u00e1ch DMA \u0111o v\u00e0 ph\u00e2n t\u00edch t\u00ednh ch\u1ea5t v\u1eadt li\u1ec7u d\u01b0\u1edbi s\u1ef1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 v\u00e0 t\u1ea7n s\u1ed1 thay \u0111\u1ed5i trong l\u0129nh v\u1ef1c c\u01a1 h\u1ecdc.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"\nPh\u00e2n T\u00edch C\u01a1 H\u1ecdc \u0110\u1ed9ng L\u1ef1c (DMA)<\/title>\n<meta name=\"description\" content=\"Ph\u00e2n t\u00edch c\u01a1 h\u1ecdc \u0111\u1ed9ng l\u1ef1c (DMA): T\u00ecm hi\u1ec3u c\u00e1ch DMA \u0111o v\u00e0 ph\u00e2n t\u00edch t\u00ednh ch\u1ea5t v\u1eadt li\u1ec7u d\u01b0\u1edbi s\u1ef1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 v\u00e0 t\u1ea7n s\u1ed1 thay \u0111\u1ed5i trong l\u0129nh v\u1ef1c 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