Isratul Rahmad
LDS Team 2012
ABSTRACT
Fracture behaviour of pineapple leaf fibre reinforced polyester composite is investigated in this research. The main interest in this research is to analyze the effect of fiber orientation, namely 90o and 45o, respect to crack propagation. The fracture toughness testing has been conducted according to ASTM D5045 standard. The result reveal that in generally the critical load regarding to crack propagation for composite with 45o fiber orientation has higher value than composite with 90o fiber orientation. The elastic energy tends to decrease significantly along with increasing initial crack length for composite with 90o fiber orientation. In contrast, the elastic energy tends to decrease slightly along with increasing initial crack length for composite with 45o fiber orientation. Furthermore, the excellent crack resistance has been shown by composite with 45o fiber orientation.
Keywords : natural fiber composites, pineapple leaf fiber, fiber orientation, fracture toughness.
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Rahim Isnan Al Hilman
LDS Team 2011
ABSTRACT
Spatial four bar linkage mechanisms are applicable to transmit the rotation on unparallel axes. One of their configurations is RSSR mechanism which is composed of Revolute-Spherical-Spherical-Revolut joints. In the dimensional synthesis of the mechanism many considerations must be maintained carefully related to the number of kinematic constants which must be determined and limitations of workingspace of the spherical joint. In this research, the dimensional synthesis was carried out based on available workingspace of spherical joint and transmission angle. It was used the generating function to determine the kinematic constants of the mechanism to perform specified relationship between input crank and follower displacements.
For the case study, it was synthesized the RSSR mechanism with revolute and follower axis orientation perpendicular to each other. Design specifications for the mechanism are crank angle, θ is 0o-360o (fully cycled) and rotation angle of follower, φ is 0o ≤ φ ≤ 180°. Based on the synthesis results, it was obtained the set of kinematic constants of the mechanism as follow, lengths of crank, coupler and follower are 5.55, 8.07and 2.79 unit respectivelly. The obtained mechanism can perform fully rotate of crank, 0o ≤ φ ≤ 133o range motion of the follower and 38.4° ≤ α ≤ 101.6o range of the transmission angle.
Keyword : Dimensional synthesis, function generator, RSSR mechanism, transmission angle
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Ricky Yusafri Govi
LDS Team 2011
ABSTRACT
Building structure’s vibration due to earthquake can be minimized by increasing value damper on the structure. One of the techniques by using dynamic damper. In the previous research has developed about dual dynamic vibration absorber, specifically mass-spring system and pendulum system. However, pendulum system is difficult to be applied in the real condition. Because there are limit on space for pendulum, building aesthetic and setting the value damper which difficult to achieve.This research is developed dynamic damper tuned liquid column damper (TLCD) which it’s replaced pendulum system. TLCD and mass-spring system are located at the top floor of two level building. Effectiveness from this both damper are evaluated experimentally. The result obtained that the vibration one the structure can be reduced.
Keywords: Earthquake, Structure, Dynamic Damper, TLCD, Experimental.
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