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경질구형 충전제가 있는 고분자물질 내에서의 평면 종파의 전파
김효대,조원호 한국섬유공학회 1982 한국섬유공학회지 Vol.19 No.5
The scattering of a plane longitudinal wave by a spherical filler embedded in an infinite homogeneous isotropic polymer has been studied to analyze damping capacity of particulatefilled polymers. Owing to the complex wave number of viscoaelastic wave the scattering cross section by a spherical rigid filler embedded in a viscoelastic polymer is found to be quite different from that of elastic material. In long wavelength limit the rates of wave energy loss by a small rigid filler are found to be inversely proportional to the third power of the radius of a spherical filler, and to increase as the damping capacity of the matrix surrounding the filler. The quantity of wave attenuation by a viscoelastic matrix is dominant over that by fillers.
성수광,권오경,김효대 한국의류학회 1989 한국의류학회지 Vol.13 No.3
In this paper, the fabric specimen undergoes repeated laundering under given condition. After this cyclic laundering was applied, the crease recoveries of the specimen were measured using shirley crease revovery tester in order to evaluate the effect of factors at given condition during crease deformation. 5 samples of grey plain cloth were desized, alkali-scoured, bleached, whased with water, and air-dried. All tests were made on samples preconditioned to 65% RH and 20℃. The experimental results were analysed statistically to relate crease recoveries and the properties of smaples, recovery periods (time) of crease. Furthermore, the crease recoveries of core-spun yarn woven fabrics were discussed in comparison with those values for 100% combed cotton yarn woven fabric and 65% polyester 35% carded cotton blended yarn woven fabric. The results obtained are as follows; 1. Regardless of materials, remarkable decrease are observed in crease recoveries about 1-5 cycles of the repeated laundering, but slack decrease are observed in crease recoveries after 5 cycle of the re-peated laundering. 2. Crease recoveries (a) of core-spun yarn woven fabrics are relate to recovery periods (t) of crease as follows; loga=0.01415 logt+2.1168 (r^2=0.94) 3. Core-spun yarn woven fabrics were superior to 100% combed cotton yarn woven fabrics and 65% polyester 35% carded cotton blended yarn woven fabric in crease recoveries. 4. Crease recoveries (a) of core-spun yarn woven fabrics are relate to cover factor (CF), thickness (T) at pressure 0.5gf/㎠, weight (W) as follows; loga=-0.3482 logCF-0.4924 logT-0.4727 W+2.4243 (r^2=0.88) 5. Crease recoveries (a) of core-spun yarn woven fabrics are relate to 2HB/B, 2HB/W, ^3√B/W, WC/T which are concerning to formation of weared clothes and bending tran formation behavior as follows; log a=0.0091 2HB/B+0.4667 2HB/W+0.0185 ^3√B/W-+0.0114 WC/T+1.8433 (r^2=0.86)