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정성균,정성교 서울産業大學校 1999 논문집 Vol.49 No.2
Mechanical characteristics of composite laminates with carbon scrim and glass scrim are evaluated in this paper. Composite laminates in USN125 group are made by inserting carbon scrim and glass scrim between layers. The stiffness properties needed for a plane-stress analysis are modulus(E₁), strength(Xt) in the fiber direction, modulus(E₂), STRENGTH(Yt) transverse to the fiber direction, one of the in-plane Poisson ratios ν12, and desity of composite laminates. These properties are routinely characterized by ASTM standards. Experimental results show that the mechanical properties of UD prepreg the transverse direction were highly improved by inserting scrim.
신용승,이승호,서유원,정성교 서울産業大學校 1999 논문집 Vol.49 No.2
As developing the technology in industry, the materials with superior grade of stiffiness and lightness are required, and hence the higher fatigue strength characteristics are necessary. Thus, the non-traditional machining to increase fatigue strength is becoming influential as very important technology. Considering environmental problem, the shot peening process is selected as a good process to increase fatigue strength. But the data related to shot peening process are not enough in this country. Shot peening process is essential to ensure repeatability and uniformity on a part to part and lot to lot basis, while conforming to the applicable specifications. The shot material, size, shape and hardness as well as velocity and impact angle must be controlled to provide consistency in peening results. In order to effectively control the shot peening process, parameters must be addressed in the following order, such as media control, coverage control, intensity control, equipment control and so on.