Electronic Theses and Dissertation

Penelitian ini bertujuan untuk mengkaji pemanfaatan limbah kain denim sebagai material penguat komposit berbasis resin epoksi dengan menggunakan tiga metode manufaktur, yaitu hand lay-up, vacuum infusion, dan compression molding. evaluasi sifat fisik dan mekanik dilakukan melalui pengujian water absorption (astm d570), uji tarik (astm d3039), dan uji lentur (astm d790). hasil penelitian menunjukkan bahwa metode manufaktur memiliki pengaruh signifikan terhadap karakteristik komposit yang dihasilkan. pada uji penyerapan air, metode hand lay-up menghasilkan nilai penyerapan terendah sebesar 4,41%, sedangkan vacuum infusion menunjukkan nilai tertinggi sebesar 7,35%, yang menunjukkan perbedaan distribusi resin antar metode. pada pengujian tarik, metode vacuum infusion menghasilkan performa terbaik dengan nilai ultimate tensile strength sebesar 41,54 mpa, regangan 15,33%, serta modulus elastisitas 1901,73 mpa. hasil serupa ditunjukkan pada uji lentur, di mana metode vacuum infusion menghasilkan nilai tertinggi dengan kekuatan lentur sebesar 64,48 mpa dan modulus lentur sebesar 1009,97 mpa. secara keseluruhan, metode vacuum infusion menghasilkan kualitas komposit terbaik ditinjau dari sifat mekaniknya, sementara compression molding menunjukkan karakter yang lebih ulet dan hand lay-up memberikan hasil menengah namun dengan penyerapan air terendah.

This study aims to examine the use of denim fabric waste as a reinforcement material for epoxy resin-based composites using three manufacturing methods, namely Hand Lay-Up, Vacuum Infusion, and Compression Molding. The physical and mechanical properties were evaluated through Water Absorption (ASTM D570), tensile (ASTM D3039), and flexural (ASTM D790) tests. The results showed that the manufacturing method had a significant effect on the characteristics of the composite produced. In the water absorption test, the Hand Lay-Up method produced the lowest absorption value of 4.41%, while Vacuum Infusion showed the highest value of 7.35%, indicating differences in resin distribution between methods. In the tensile test, the Vacuum Infusion method produced the best performance with an Ultimate Tensile Strength value of 41.54 MPa, a strain of 15.33%, and an elastic modulus of 1901.73 MPa. Similar results were shown in the flexural test, where the Vacuum Infusion method produced the highest values with a flexural strength of 64.48 MPa and a flexural modulus of 1009.97 MPa. Overall, the Vacuum Infusion method produced the best composite quality in terms of mechanical properties, while Compression Molding showed more ductile characteristics and Hand Lay-Up provided intermediate results but with the lowest water absorption.