11-27+12-02-Lecture

11-27+12-02-Lecture - 1 C o m p o s i t e s ENGR-213...

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Unformatted text preview: 1 C o m p o s i t e s ENGR-213 COMPOSITES multiphase matl w/ improved combo of prop continuous matrix & dispersed phase principle of combined action manufactured artificially or naturally pearlite - ferrite (soft) + cementite (hard) wood - fibres (flexible) + lignin (stiff) properties Dispersed phase characteristics a. concentration b. particle size c. shape d. distribution e. orientation COMPOSITE TYPES PARTICLE-REINFORCED large-particle (metals, ceramics, polymers) small, hard, stiff evenly distributed particles strong matrix-particle bond required particles carry load, restrain movement matrix binds particles; keeps them apart e.g., concrete: sand + gravel in cement matrix dispersion-strengthened (metals) few % of very small (0.01 - 0.1 m), hard, inert particles impede dislocations effective at T high & long time; conditions which could reverse ppt hardening e.g., ThO 2 in Ni alloys LARGE-PARTICLE MODULUS...
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11-27+12-02-Lecture - 1 C o m p o s i t e s ENGR-213...

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