{"id":9872,"date":"2026-02-24T15:11:46","date_gmt":"2026-02-24T07:11:46","guid":{"rendered":"https:\/\/www.packqc.com\/standard\/astm-d1938-2\/"},"modified":"2026-04-16T09:53:05","modified_gmt":"2026-04-16T01:53:05","slug":"astm-d1938","status":"publish","type":"standard","link":"https:\/\/www.packqc.com\/vi\/standard\/astm-d1938\/","title":{"rendered":"Ti\u00eau chu\u1ea9n ASTMD1938"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Nguy\u00ean l\u00fd th\u1eed nghi\u1ec7m \u0111\u1ed9 r\u00e1ch qu\u1ea7n theo ti\u00eau chu\u1ea9n ASTM D1938<\/h2>\n\n\n\n<p>C\u00e1c <strong data-start=\"1385\" data-end=\"1401\">V\u1ebft r\u00e1ch tr\u00ean qu\u1ea7n<\/strong> Ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong ti\u00eau chu\u1ea9n ASTM D1938 \u0111o l\u1ef1c c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ea1o ra m\u1ed9t v\u1ebft r\u00e1ch duy nh\u1ea5t qua m\u1eabu m\u00e0ng nh\u1ef1a. M\u1eabu \u0111\u01b0\u1ee3c chu\u1ea9n b\u1ecb v\u1edbi m\u1ed9t v\u1ebft c\u1eaft trung t\u00e2m t\u1ea1o th\u00e0nh hai \"ch\u00e2n\", gi\u1ed1ng nh\u01b0 m\u1ed9t \u0111\u00f4i qu\u1ea7n. M\u1ed7i ch\u00e2n \u0111\u01b0\u1ee3c k\u1eb9p v\u00e0o m\u00e1y th\u1eed k\u00e9o, v\u00e0 c\u00e1c k\u1eb9p t\u00e1ch ra v\u1edbi t\u1ed1c \u0111\u1ed9 kh\u00f4ng \u0111\u1ed5i.<\/p>\n\n\n\n<p>Trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m, thi\u1ebft b\u1ecb ghi l\u1ea1i l\u1ef1c c\u1ea7n thi\u1ebft \u0111\u1ec3 ti\u1ebfp t\u1ee5c x\u00e9 m\u00e0ng qua m\u1ed9t kho\u1ea3ng c\u00e1ch \u0111\u00e3 \u0111\u1ecbnh. L\u1ef1c n\u00e0y ph\u1ea3n \u00e1nh \u0111\u1eb7c t\u00ednh c\u1ee7a v\u1eadt li\u1ec7u. <strong data-start=\"1862\" data-end=\"1893\">Kh\u1ea3 n\u0103ng ch\u1ed1ng lan truy\u1ec1n v\u1ebft n\u1ee9t<\/strong>, kh\u00e1c v\u1edbi \u0111\u1ed9 b\u1ec1n k\u00e9o ho\u1eb7c kh\u1ea3 n\u0103ng ch\u1ed1ng \u0111\u00e2m th\u1ee7ng. Tr\u00ean th\u1ef1c t\u1ebf, m\u1ed9t m\u00e0ng c\u00f3 \u0111\u1ed9 b\u1ec1n k\u00e9o cao v\u1eabn c\u00f3 th\u1ec3 cho k\u1ebft qu\u1ea3 k\u00e9m trong th\u1eed nghi\u1ec7m r\u00e1ch c\u1ee7a m\u00e0ng nh\u1ef1a n\u1ebfu v\u1ebft r\u00e1ch lan r\u1ed9ng d\u1ec5 d\u00e0ng sau khi b\u1eaft \u0111\u1ea7u.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">T\u1ea1i sao kh\u1ea3 n\u0103ng ch\u1ed1ng lan truy\u1ec1n v\u1ebft n\u1ee9t l\u1ea1i quan tr\u1ecdng?<\/h3>\n\n\n\n<p>Trong c\u00e1c \u1ee9ng d\u1ee5ng m\u00e0ng nh\u1ef1a, kh\u1ea3 n\u0103ng ch\u1ed1ng r\u00e1ch \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u1ea3 hi\u1ec7u su\u1ea5t v\u00e0 an to\u00e0n. M\u00e0ng \u0111\u00f3ng g\u00f3i cho th\u1ef1c ph\u1ea9m, d\u01b0\u1ee3c ph\u1ea9m v\u00e0 thi\u1ebft b\u1ecb y t\u1ebf ph\u1ea3i ch\u1ecbu \u0111\u01b0\u1ee3c r\u00e1ch trong qu\u00e1 tr\u00ecnh h\u00e0n k\u00edn, x\u1eed l\u00fd v\u00e0 ph\u00e2n ph\u1ed1i. M\u00e0ng n\u00f4ng nghi\u1ec7p, l\u1edbp l\u00f3t c\u00f4ng nghi\u1ec7p v\u00e0 t\u1ea5m b\u1ea3o v\u1ec7 c\u0169ng ph\u1ea3i \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u t\u01b0\u01a1ng t\u1ef1.<\/p>\n\n\n\n<p>C\u00e1c <strong data-start=\"2461\" data-end=\"2481\">Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m \u0111\u1ed9 b\u1ec1n r\u00e1ch<\/strong> \u0110\u01b0\u1ee3c m\u00f4 t\u1ea3 trong ti\u00eau chu\u1ea9n ASTM D1938 gi\u00fap c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>So s\u00e1nh c\u00e1c v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 d\u00e0y v\u00e0 c\u00f4ng th\u1ee9c t\u01b0\u01a1ng t\u1ef1.<\/li>\n\n\n\n<li>T\u1ed1i \u01b0u h\u00f3a c\u1ea5u tr\u00fac phim \u0111\u1ec3 t\u0103ng \u0111\u1ed9 b\u1ec1n<\/li>\n\n\n\n<li>Gi\u1ea3m thi\u1ec3u s\u1ef1 c\u1ed1 s\u1ea3n ph\u1ea9m do r\u00e1ch kh\u00f4ng ki\u1ec3m so\u00e1t.<\/li>\n\n\n\n<li>H\u1ed7 tr\u1ee3 l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n s\u1ea3n ph\u1ea9m<\/li>\n<\/ul>\n\n\n\n<p>V\u00ec ph\u01b0\u01a1ng ph\u00e1p n\u00e0y t\u1eadp trung v\u00e0o kh\u1ea3 n\u0103ng ch\u1ed1ng r\u00e1ch, n\u00f3 cung c\u1ea5p d\u1eef li\u1ec7u c\u00f3 s\u1ef1 t\u01b0\u01a1ng quan t\u1ed1t v\u1edbi nhi\u1ec1u ch\u1ebf \u0111\u1ed9 h\u1ecfng h\u00f3c th\u1ef1c t\u1ebf.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Chu\u1ea9n b\u1ecb m\u1eabu v\u00e0 \u0111i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m<\/h2>\n\n\n\n<p>Ti\u00eau chu\u1ea9n ASTM D1938 quy \u0111\u1ecbnh c\u00e1c y\u00eau c\u1ea7u nghi\u00eam ng\u1eb7t v\u1ec1 k\u00edch th\u01b0\u1edbc m\u1eabu, \u0111\u1ed9 \u0111\u1ed3ng \u0111\u1ec1u v\u1ec1 \u0111\u1ed9 d\u00e0y v\u00e0 \u0111i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m. Vi\u1ec7c chu\u1ea9n b\u1ecb m\u1eabu \u0111\u00fang c\u00e1ch \u0111\u1ea3m b\u1ea3o r\u1eb1ng k\u1ebft qu\u1ea3 ph\u1ea3n \u00e1nh \u0111\u1eb7c t\u00ednh c\u1ee7a v\u1eadt li\u1ec7u ch\u1ee9 kh\u00f4ng ph\u1ea3i s\u1ef1 bi\u1ebfn \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m. M\u1eabu th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1eed nghi\u1ec7m c\u1ea3 theo h\u01b0\u1edbng m\u00e1y v\u00e0 h\u01b0\u1edbng ngang \u0111\u1ec3 ghi nh\u1eadn c\u00e1c \u0111\u1eb7c t\u00ednh d\u1ecb h\u01b0\u1edbng th\u01b0\u1eddng g\u1eb7p trong m\u00e0ng \u00e9p \u0111\u00f9n.<\/p>\n\n\n\n<p>\u0110i\u1ec1u ki\u1ec7n b\u1ea3o qu\u1ea3n \u1edf nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111\u1ed9 \u1ea9m \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n c\u1ee7a k\u1ebft qu\u1ea3. M\u00e0ng nh\u1ef1a th\u01b0\u1eddng nh\u1ea1y c\u1ea3m v\u1edbi \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng, v\u00e0 vi\u1ec7c b\u1ea3o qu\u1ea3n theo ti\u00eau chu\u1ea9n gi\u00fap c\u1ea3i thi\u1ec7n t\u00ednh l\u1eb7p l\u1ea1i gi\u1eefa c\u00e1c ph\u00f2ng th\u00ed nghi\u1ec7m.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Gi\u1ea3i th\u00edch k\u1ebft qu\u1ea3 t\u1eeb th\u1eed nghi\u1ec7m \u0111\u1ed9 b\u1ec1n k\u00e9o c\u1ee7a m\u00e0ng nh\u1ef1a<\/h2>\n\n\n\n<p>K\u1ebft qu\u1ea3 c\u1ee7a th\u1eed nghi\u1ec7m ASTM D1938 th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb d\u01b0\u1edbi d\u1ea1ng l\u1ef1c lan truy\u1ec1n v\u1ebft r\u00e1ch trung b\u00ecnh. \u0110\u1ed1i v\u1edbi c\u00e1c m\u00e0ng \u00edt co gi\u00e3n, l\u1ef1c n\u00e0y duy tr\u00ec t\u01b0\u01a1ng \u0111\u1ed1i \u1ed5n \u0111\u1ecbnh trong qu\u00e1 tr\u00ecnh r\u00e1ch. C\u00e1c m\u00e0ng c\u00f3 \u0111\u1ed9 co gi\u00e3n cao c\u00f3 th\u1ec3 cho th\u1ea5y c\u00e1c gi\u00e1 tr\u1ecb l\u1ef1c dao \u0111\u1ed9ng, \u0111\u00f2i h\u1ecfi ph\u1ea3i ph\u00e2n t\u00edch c\u1ea9n th\u1eadn \u0111\u1ed3 th\u1ecb t\u1ea3i tr\u1ecdng - \u0111\u1ed9 gi\u00e3n.<\/p>\n\n\n\n<p>Khi so s\u00e1nh c\u00e1c v\u1eadt li\u1ec7u, vi\u1ec7c xem x\u00e9t \u0111\u1ed9 d\u00e0y, h\u01b0\u1edbng v\u00e0 c\u1ea5u tr\u00fac m\u00e0ng l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft. D\u1eef li\u1ec7u theo ti\u00eau chu\u1ea9n ASTM D1938 gi\u00fap x\u1ebfp h\u1ea1ng c\u00e1c v\u1eadt li\u1ec7u m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 trong c\u00e1c nh\u00f3m t\u01b0\u01a1ng t\u1ef1, tuy nhi\u00ean, ch\u00fang kh\u00f4ng lu\u00f4n d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t s\u1eed d\u1ee5ng cu\u1ed1i c\u00f9ng c\u1ee7a v\u1eadt li\u1ec7u m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ASTM D1938 So s\u00e1nh v\u1edbi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m \u0111\u1ed9 r\u00e1ch kh\u00e1c<\/h2>\n\n\n\n<p>C\u00f3 m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m \u0111\u1ed9 r\u00e1ch, bao g\u1ed3m th\u1eed nghi\u1ec7m \u0111\u1ed9 r\u00e1ch Elmendorf v\u00e0 th\u1eed nghi\u1ec7m \u0111\u1ed9 r\u00e1ch b\u1eb1ng l\u01b0\u1ee1i. Ti\u00eau chu\u1ea9n ASTM D1938 kh\u00e1c bi\u1ec7t \u1edf ch\u1ed7 nh\u1ea5n m\u1ea1nh v\u00e0o... <strong data-start=\"4293\" data-end=\"4324\">Kh\u1ea3 n\u0103ng ch\u1ed1ng lan truy\u1ec1n v\u1ebft n\u1ee9t<\/strong> D\u01b0\u1edbi s\u1ef1 ki\u1ec3m so\u00e1t c\u1ee7a l\u1ef1c t\u00e1ch r\u1eddi thay v\u00ec \u0111o l\u1ef1c va ch\u1ea1m ho\u1eb7c l\u1ef1c \u0111\u1ec9nh. \u0110\u1ed1i v\u1edbi m\u00e0ng nh\u1ef1a v\u00e0 t\u1ea5m m\u1ecfng, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y cung c\u1ea5p d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p h\u01a1n, \u0111\u1eb7c bi\u1ec7t khi m\u00e0ng nh\u1ef1a tr\u1ea3i qua qu\u00e1 tr\u00ecnh r\u00e1ch ch\u1eadm v\u00e0 li\u00ean t\u1ee5c trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng.<\/p>\n\n\n\n<p>L\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m \u0111\u1ed9 r\u00e1ch ph\u00f9 h\u1ee3p \u0111\u1ea3m b\u1ea3o k\u1ebft qu\u1ea3 c\u00f3 \u00fd ngh\u0129a v\u00e0 tr\u00e1nh vi\u1ec7c hi\u1ec3u sai trong qu\u00e1 tr\u00ecnh \u0111\u00e1nh gi\u00e1 ch\u1ea5t l\u01b0\u1ee3ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Gi\u1ea3i ph\u00e1p ki\u1ec3m th\u1eed t\u1eeb Cell Instruments<\/h2>\n\n\n\n<p>\u0110\u1ec3 th\u1ef1c hi\u1ec7n th\u1eed nghi\u1ec7m ASTM D1938 ch\u00ednh x\u00e1c, c\u1ea7n c\u00f3 m\u1ed9t m\u00f4i tr\u01b0\u1eddng \u1ed5n \u0111\u1ecbnh. <a href=\"https:\/\/www.packqc.com\/vi\/product\/sale-packaging-tensile-strength-tester-film\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"4777\" data-end=\"4795\">m\u00e1y th\u1eed \u0111\u1ed9 b\u1ec1n k\u00e9o<\/strong><\/a> V\u1edbi kh\u1ea3 n\u0103ng \u0111i\u1ec1u khi\u1ec3n t\u1ed1c \u0111\u1ed9 ch\u00ednh x\u00e1c, \u0111o l\u1ef1c \u0111\u00e1ng tin c\u1eady v\u00e0 c\u00e1c k\u1eb9p ph\u00f9 h\u1ee3p cho m\u1eabu v\u1ea3i qu\u1ea7n b\u1ecb r\u00e1ch. <strong data-start=\"4899\" data-end=\"4919\">D\u1ee5ng c\u1ee5 t\u1ebf b\u00e0o<\/strong> Cung c\u1ea5p c\u00e1c h\u1ec7 th\u1ed1ng th\u1eed nghi\u1ec7m k\u00e9o ti\u00ean ti\u1ebfn \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u c\u1ee7a ti\u00eau chu\u1ea9n ASTM D1938 \u0111\u1ed3ng th\u1eddi h\u1ed7 tr\u1ee3 c\u1ea5u h\u00ecnh linh ho\u1ea1t cho c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u m\u00e0ng kh\u00e1c nhau.<\/p>\n\n\n\n<p>Ngo\u00e0i c\u00e1c b\u00e0i ki\u1ec3m tra ti\u00eau chu\u1ea9n, Cell Instruments c\u00f2n h\u1ed7 tr\u1ee3 c\u00e1c thi\u1ebft b\u1ecb ki\u1ec3m tra t\u00f9y ch\u1ec9nh, n\u00e2ng c\u1ea5p t\u1ef1 \u0111\u1ed9ng h\u00f3a v\u00e0 c\u00e1c gi\u1ea3i ph\u00e1p ki\u1ec3m tra \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ri\u00eang cho c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t bao b\u00ec, y t\u1ebf, d\u01b0\u1ee3c ph\u1ea9m v\u00e0 m\u00e0ng nh\u1ef1a. C\u00e1c kh\u1ea3 n\u0103ng n\u00e0y gi\u00fap c\u00e1c ph\u00f2ng th\u00ed nghi\u1ec7m n\u00e2ng cao hi\u1ec7u qu\u1ea3, \u0111\u1ed9 tin c\u1eady c\u1ee7a d\u1eef li\u1ec7u v\u00e0 tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\n\t\t\t\tLi\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i \u0111\u1ec3 nh\u1eadn gi\u1ea3i ph\u00e1p th\u1eed nghi\u1ec7m theo ti\u00eau chu\u1ea9n ASTM D1938.\t\t\t\t<\/h2>\n\n\n\n<p>Ti\u00eau chu\u1ea9n ASTM D1938 v\u1eabn l\u00e0 ti\u00eau chu\u1ea9n quan tr\u1ecdng \u0111\u1ec3 \u0111\u00e1nh gi\u00e1. <strong data-start=\"5469\" data-end=\"5500\">Kh\u1ea3 n\u0103ng ch\u1ed1ng lan truy\u1ec1n v\u1ebft n\u1ee9t<\/strong> trong m\u00e0ng nh\u1ef1a. B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o c\u00e1ch v\u1ebft r\u00e1ch ph\u00e1t tri\u1ec3n trong \u0111i\u1ec1u ki\u1ec7n \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t, \u0111i\u1ec1u n\u00e0y <strong data-start=\"5585\" data-end=\"5605\">Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m \u0111\u1ed9 b\u1ec1n r\u00e1ch<\/strong> Cung c\u1ea5p d\u1eef li\u1ec7u th\u1ef1c ti\u1ec5n v\u00e0 c\u00f3 th\u1ec3 so s\u00e1nh \u0111\u01b0\u1ee3c cho vi\u1ec7c l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u v\u00e0 ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng. V\u1edbi thi\u1ebft b\u1ecb th\u1eed nghi\u1ec7m \u0111\u00e1ng tin c\u1eady v\u00e0 chuy\u00ean m\u00f4n k\u1ef9 thu\u1eadt t\u1eeb Cell Instruments, c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t c\u00f3 th\u1ec3 t\u1ef1 tin \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng ch\u1ed1ng r\u00e1ch v\u00e0 n\u00e2ng cao \u0111\u1ed9 b\u1ec1n s\u1ea3n ph\u1ea9m trong c\u00e1c \u1ee9ng d\u1ee5ng \u0111a d\u1ea1ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n\n\n\n<p>1. Ti\u00eau chu\u1ea9n ASTM D1938 l\u00e0 g\u00ec?<br><strong data-start=\"176\" data-end=\"190\">Ti\u00eau chu\u1ea9n ASTMD1938<\/strong> \u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o l\u1ef1c c\u1ea7n thi\u1ebft \u0111\u1ec3 lan truy\u1ec1n v\u1ebft r\u00e1ch tr\u00ean m\u00e0ng nh\u1ef1a v\u00e0 t\u1ea5m m\u1ecfng (\u0111\u1ed9 d\u00e0y \u2264 1 mm) b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p r\u00e1ch \u0111\u01a1n. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y r\u1ea5t quan tr\u1ecdng trong vi\u1ec7c \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng ch\u1ed1ng r\u00e1ch c\u1ee7a m\u00e0ng nh\u1ef1a, \u0111i\u1ec1u n\u00e0y c\u00f3 \u00fd ngh\u0129a quan tr\u1ecdng trong c\u00e1c quy tr\u00ecnh \u0111\u00f3ng g\u00f3i v\u00e0 l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u. M\u1ee5c ti\u00eau ch\u00ednh c\u1ee7a th\u1eed nghi\u1ec7m n\u00e0y l\u00e0 \u0111o l\u1ef1c c\u1ea7n thi\u1ebft \u0111\u1ec3 v\u1ebft r\u00e1ch lan truy\u1ec1n t\u1eeb v\u1ebft c\u1eaft ban \u0111\u1ea7u qua v\u1eadt li\u1ec7u.<\/p>\n\n\n\n<p>2. Th\u1eed nghi\u1ec7m r\u00e1ch qu\u1ea7n l\u00e0 g\u00ec?<br>C\u00e1c <strong data-start=\"680\" data-end=\"696\">V\u1ebft r\u00e1ch tr\u00ean qu\u1ea7n<\/strong> Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 trong ti\u00eau chu\u1ea9n ASTM D1938. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y bao g\u1ed3m vi\u1ec7c c\u1eaft m\u1ed9t v\u1ebft r\u00e1ch h\u00ecnh qu\u1ea7n v\u00e0o m\u1eabu m\u00e0ng, k\u1eb9p hai \u201cch\u00e2n\u201d c\u1ee7a v\u1ebft r\u00e1ch v\u00e0o m\u00e1y th\u1eed nghi\u1ec7m v\u00e0 k\u00e9o m\u1eabu v\u1edbi t\u1ed1c \u0111\u1ed9 c\u1ed1 \u0111\u1ecbnh. L\u1ef1c c\u1ea7n thi\u1ebft \u0111\u1ec3 lan truy\u1ec1n v\u1ebft r\u00e1ch \u0111\u01b0\u1ee3c \u0111o trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y gi\u00fap \u0111\u00e1nh gi\u00e1 m\u1ee9c \u0111\u1ed9 d\u1ec5 d\u00e0ng m\u00e0 v\u1ebft r\u00e1ch c\u00f3 th\u1ec3 lan truy\u1ec1n trong m\u00e0ng nh\u1ef1a d\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng c\u1ee7a l\u1ef1c c\u0103ng.<\/p>\n\n\n\n<p>3. ASTM D1938 kh\u00e1c v\u1edbi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m \u0111\u1ed9 r\u00e1ch kh\u00e1c nh\u01b0 th\u1ebf n\u00e0o?<br>ASTM D1938 t\u1eadp trung c\u1ee5 th\u1ec3 v\u00e0o vi\u1ec7c \u0111o l\u01b0\u1eddng kh\u1ea3 n\u0103ng ch\u1ed1ng r\u00e1ch khi v\u1ebft r\u00e1ch \u0111\u00e3 b\u1eaft \u0111\u1ea7u, trong khi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c nh\u01b0... <strong data-start=\"1289\" data-end=\"1312\">Th\u1eed nghi\u1ec7m Elmendorf<\/strong> T\u1eadp trung v\u00e0o l\u1ef1c c\u1ea7n thi\u1ebft \u0111\u1ec3 b\u1eaft \u0111\u1ea7u qu\u00e1 tr\u00ecnh r\u00e1ch. \u0110i\u1ec1u n\u00e0y khi\u1ebfn ti\u00eau chu\u1ea9n ASTM D1938 \u0111\u1eb7c bi\u1ec7t h\u1eefu \u00edch cho m\u00e0ng nh\u1ef1a, v\u00ec n\u00f3 m\u00f4 ph\u1ecfng qu\u00e1 tr\u00ecnh r\u00e1ch th\u1ef1c t\u1ebf, n\u01a1i v\u1ebft r\u00e1ch b\u1eaft \u0111\u1ea7u v\u00e0 lan r\u1ed9ng kh\u1eafp v\u1eadt li\u1ec7u, thay v\u00ec ch\u1ec9 ki\u1ec3m tra kh\u1ea3 n\u0103ng ch\u1ed1ng r\u00e1ch ban \u0111\u1ea7u c\u1ee7a v\u1eadt li\u1ec7u.<\/p>\n\n\n\n<p>4. Ti\u00eau chu\u1ea9n ASTM D1938 \u00e1p d\u1ee5ng cho nh\u1eefng lo\u1ea1i phim n\u00e0o?<br><a href=\"https:\/\/store.astm.org\/d1938-19.html?_gl=1*17uechj*_gcl_aw*R0NMLjE3Njg3ODk3MzcuQ2owS0NRaUFwckxMQmhDTUFSSXNBRURoZFBmZnpaMHVBMGMtdjB4RWdqR0hGSWVCaVZjeTJBM3RfRHV0ajduOVh3QlJuQUVlbGdZOU00TWFBcWlSRUFMd193Y0I.*_gcl_au*MTkwOTY2MzAwNC4xNzY1Nzc5ODUz\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Ti\u00eau chu\u1ea9n ASTMD1938<\/a> Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m n\u00e0y \u00e1p d\u1ee5ng cho m\u00e0ng nh\u1ef1a v\u00e0 t\u1ea5m m\u1ecfng c\u00f3 \u0111\u1ed9 d\u00e0y l\u00ean \u0111\u1ebfn 1 mm. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c m\u00e0ng c\u00f3 \u0111\u1ed9 d\u00e0y d\u01b0\u1edbi 0,25 mm (0,010 inch). Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c m\u00e0ng b\u1ecb g\u00e3y gi\u00f2n trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m, v\u00e0 ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ri\u00eang cho c\u00e1c v\u1eadt li\u1ec7u kh\u00f4ng b\u1ecb r\u00e1ch theo h\u01b0\u1edbng ngang trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m.<\/p>","protected":false},"excerpt":{"rendered":"<p>ASTM D1938 Trouser Tear Test Principle The trouser tear method defined in ASTM D1938 measures the force required to propagate a single tear through a plastic film specimen. The specimen is prepared with a central slit that forms two \u201clegs,\u201d resembling a pair of trousers. Each leg is clamped into a tensile testing machine, and [&hellip;]<\/p>","protected":false},"featured_media":8743,"parent":0,"template":"","meta":{"_acf_changed":true,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}}},"standard-category":[611],"class_list":["post-9872","standard","type-standard","status-publish","has-post-thumbnail","hentry","standard-category-astm"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.packqc.com\/vi\/wp-json\/wp\/v2\/standard\/9872","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.packqc.com\/vi\/wp-json\/wp\/v2\/standard"}],"about":[{"href":"https:\/\/www.packqc.com\/vi\/wp-json\/wp\/v2\/types\/standard"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.packqc.com\/vi\/wp-json\/wp\/v2\/media\/8743"}],"wp:attachment":[{"href":"https:\/\/www.packqc.com\/vi\/wp-json\/wp\/v2\/media?parent=9872"}],"wp:term":[{"taxonomy":"standard-category","embeddable":true,"href":"https:\/\/www.packqc.com\/vi\/wp-json\/wp\/v2\/standard-category?post=9872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}