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Teknologi modern mempersyaratkan material dengan kombinasi sifat yang tidak dipenuhi oleh paduan logam, keramik, dan polimer
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Teknologi modern mempersyaratkan material dengan kombinasi sifat yang tidak dipenuhi oleh paduan logam, keramik, dan polimer
Aplikasi teknologi modern: AerospaceAerospace Underwater Transportation
Pesawat terbang perlu sifat: Low densities Strong Stiff Abrasion and impact resistant Not easily corrodedNot easily corroded
In generally, Strong materials are: relatively dense increasing strength and results in a decrease in impact strength
Komposit
Polimer (resin) Logam (Al, Ni) Keramik (Al 2 O 3 ,
Serat karbon Serat gelas Keramik (Al 2 O 3 ,^ ^ Serat aramid SiO 2
Serat aramid (Kevlar) Logam (Al, Ti, Ni)
Fungsi matrik dan serat
Karakter fasa terdispersi sifat komposit
Klasifikasi Komposit
Large-particle Particle-reinforced Dispersion-strengthened
Continuous (aligned)
Composites
Structural
Fiber-reinforced Discontinuous (short)
Aligned
Random Laminates
Sandwich
Dispersion-strengthened composites
Contoh;sudu turbin (Ni alloy-diperkuat 3% volum (ThO 2 )
Sifat mekanik fiber-reinforced composites bergantung: Sifat serat Tingkat load/beban yang dipindahkan ke serat oleh matrik besar ikatan antar muka antara matrik dengan serat
Di mana: = kekuatan tarik serat= kekuatan tarik serat
= kekuatan ikatan matrik-serat atau kekuatan geser matrik d = diameter serat
a. l = lc beban maksimum serat dicapai pada posisi tengah-tengah
b. l > lc penguatan serat lebih efektif
c.c. l < ll < lcc penguatan serat sedikit, tidakpenguatan serat sedikit, tidak ada tranfer tegangan
Pengaruh orientasi dan konsentrasi
Continuous and aligned fiber composites
Longitudinal
Transversal
Untuk Pembebanan Arah Longitudinal :
Untuk Pembebanan Arah Longitudinal :
Transversal c
f f c
m
f f
f m m
m c
Untuk beban longitudinal: bersifat isostrain
c
f f c
m
f f
f m m
m c
Untuk beban longitudinal: bersifat isostrain
Continuous and aligned fiber composites
Longitudinal
Transversal
Transversal
E (^) c (^) l Em ( 1 V f ) E f V f
Or