#TITLE_ALTERNATIVE#

• Main Author: DWI ADITYA ( NIM : 20211312) Pembimbing : Widayani, Ph.D. ;Dr. rer.nat Sparisoma Viridi, IRFAN
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/18720
• Institution: Institut Teknologi Bandung

Composite materials have many advantages because of the nature of composite <br /> <br /> <br /> <br /> <br /> materials that can be engineered as needed. Composite material composed of matrix <br /> <br /> <br /> <br /> <br /> that that serves as a matrix to transfer stress between the fiber reinforcement and also <br /> <br /> <br /> <br /> <br /> to protect the fiber from mechanical damage, and fiber as the reinforcement. This <br /> <br /> <br /> <br /> <br /> research was conducted to study the mechanical character of fiber aligned continuous <br /> <br /> <br /> <br /> <br /> composite, specifically on pressure test. The research was conducted through <br /> <br /> <br /> <br /> <br /> simulations and experimentations. <br /> <br /> <br /> <br /> <br /> The object tested in the research consisted of two fiber aligned continuous composite; <br /> <br /> <br /> <br /> <br /> composite with epoxy matrix & pencil carbon filler and with wood matrix & epoxy <br /> <br /> <br /> <br /> <br /> filler. The simulation was conducted using the Abaqus FEA 6.12 students edition <br /> <br /> <br /> <br /> <br /> software and utilizing the theory based on the “rule of mixtures”. For the experiment <br /> <br /> <br /> <br /> <br /> part, pressure tests were conducted to the composite object that has been made. <br /> <br /> <br /> <br /> <br /> Epoxy sample dimension created is 2 cm × 2 cm × 5 cm using fiber pencil rods as a <br /> <br /> <br /> <br /> <br /> fiber with diameter 0.2 cm. While the aligned continuous fiber composite model <br /> <br /> <br /> <br /> <br /> composite with wood matrix & epoxy filler has dimensions of 2.5 cm x 2.5 cm x 5 <br /> <br /> <br /> <br /> <br /> cm for the matrix and cylindrical fiber with a diameter of 0.5 cm and 5 cm length. <br /> <br /> <br /> <br /> <br /> v <br /> <br /> <br /> <br /> <br /> Simulations carried out using the same procedure with the compressive test procedure <br /> <br /> <br /> <br /> <br /> that is done by using Tensilon UCT-5T at P3FT LIPI Bandung by applying <br /> <br /> <br /> <br /> <br /> compressive test procedure with isostrain method, in which the matrix and fibers <br /> <br /> <br /> <br /> <br /> undergo the same length changes during testing. <br /> <br /> <br /> <br /> <br /> It appears that there is a difference between the simulation results with theoretical <br /> <br /> <br /> <br /> <br /> calculations. The more the number of fibers, the difference is even greater. It is very <br /> <br /> <br /> <br /> <br /> likely caused by the change in dimension of the fiber during the simulation process. <br /> <br /> <br /> <br /> <br /> To solve this problem, is to make just one fiber for different fiber volume fractions. <br /> <br /> <br /> <br /> <br /> Results of this simulation model is more in line with the theoretical picture. <br /> <br /> <br /> <br /> <br /> From the pressure tests, it was observed that the composite experienced bulging on <br /> <br /> <br /> <br /> <br /> the part which pressure was applied to by the pressure device. From the Micro CT <br /> <br /> <br /> <br /> <br /> scan result, we can see that in fact, the filler rods are broken everywhere The <br /> <br /> <br /> <br /> <br /> phenomena cannot seen by naked eyes. The result indicates that actually during the <br /> <br /> <br /> <br /> <br /> compression testing the response from the samples is only from the epoxy. <br /> <br /> <br /> <br /> <br /> Simulation study with epoxy matrix and pencil rods as a fiber shows that to improve <br /> <br /> <br /> <br /> <br /> the simulation, we add a brittle thin material to cover the upper part of the model. <br /> <br /> <br /> <br /> <br /> This thin material is stuck to the model. <br /> <br /> <br /> <br /> <br /> In the composite model with wood and fiber epoxy matrix seems that after a fully <br /> <br /> <br /> <br /> <br /> charged epoxy happened absorption by the wood so it looks like the epoxy volume <br /> <br /> <br /> <br /> <br /> decreases and therefore need the addition of a few times to meet them. Through this <br /> <br /> <br /> <br /> <br /> phenomenon is known that wood Albasiah have pores that can absorb epoxy. <br /> <br /> <br /> <br /> <br /> Based on visual observations and the observations using CT-scan on the composite <br /> <br /> <br /> <br /> <br /> model with albasiah matrix and epoxy fiber, during manufacturing process, epoxy <br /> <br /> <br /> <br /> <br /> absorption by wood phenomenon happen, and thus essentially a matrix that being <br /> <br /> <br /> <br /> <br /> used is not pure Albasiah wood, but Albasiah wood that has absorbed epoxy. While <br /> <br /> <br /> <br /> <br /> the results of the simulation show that the more the number of fibers, the volume of <br /> <br /> <br /> <br /> <br /> absorbed epoxy by the wood was more and more. <br /> <br /> <br /> <br /> <br /> vi Simulations also show that the distribution of the change in length (displacement) is <br /> <br /> <br /> <br /> <br /> greater at the top of the model or areas in direct contact with the pressure. <br />