Hamzah Ibnu Yasin et al., International Journal of Emerging Trends in Engineering Research, 9(2), February 2021, 56 – 59 56 ABSTRACT In the previous study, frame tube design analysis is developed to provide a significant reduction in stress and deformation. This study aims to analyze the frame tube composite design. The design analysis by using FEM software is used to model frame tubes with shell elements. The layer angle orientation is set as design parameters. Material is carbon fiber composite (epoxy E-glass UD). Dimension thickness is 2 mm. Seat tube angle 74.5 o and head tube angle 70.5 o . Load is applied in static condition with weight loading on 80 Kg. Based on the simulation results, the smallest deformation and stress values occur in the model with a layer orientation angle of [45 o , 90 o , 90 o , 45 o ] with a deformation value of 0.099556 mm and a stress of 10.016 MPa. Key words: frame tube, stress, deformation, composite, carbon fiber, static, layer orientation angel. 1. INTRODUCTION All terrain bikes (ATB) or mountain bikes (MTB) are bikes that are used on extreme terrain. In 1970, MTB bikes were first introduced in the hills of San Francisco. In 1981 exhibited at the New York Bike Show, the mountain bike inventor said that this type of bicycle would never be popular. However, approximately 80% of the bicycles sold in the United States are MTB type bikes. The ATB / MTB bicycle is the first bicycle to be ridden to the top of Mount Kilimanjaro, the highest point on the African continent, 5,895 m [1]. Since then, MTB bikes have become known to the world. Currently bicycles are becoming a means of transportation and sport which is again popularly used by many people. Especially since the Covid-19 pandemic, bicycle users have increased. The needs for the bicycle market need to be increased with safety considerations. To design a bicycle, we should test the bicycle frame by paying attention to several standards that must be owned, one of which is the research method by varying the material and thickness of the frame compiler pipe and simulating [2]. The optimum design conditions for a bicycle for an angel of seat tube frame are 72 o and the rider load is approximately 90 kg based on the results of the analysis conducted by [3]. Optimization of the modification of head tube angle 69 o - 76 o and top tube angle 70 o - 86 o resulted in a change, namely reducing the stress on the bicycle frame structure [4]. In this study, we will modify the angle of the head tube (70.5 o ) and seat tube (74.5 o ) with other angles being freed to fit the bicycle frame model [5]. In the use of carbon fiber materials, it is preferable to obtain stiffness with a lighter mass in a special frame [6], so that if it is used on a bicycle frame it will be lighter and stronger with carbon fiber composite material to obtain comfort and safety while driving. Analysis of the finite element method by [7] on simulating the stress strength of a bicycle frame in the ANSYS FEM software using various boundary conditions and the results were compared with the theoretical results in the literature analysis. All stresses were found to be well below the maximum material stress limits and the results were found to be in agreement with the theoretical results. They suggested that the design can be developed with composite materials for further analysis. Composite is a new material trend in demand for structural design because it has the advantage of high strength and stiffness to weight ratio [8]. Therefore, it is a challenge for modification of the frame tube using composite materials. According to o, increasing the thickness of the tube wall alone, does not lead to problem solving [9]. Currently carbon is increasingly being used and developed to achieve good strength and lightness [10]. Based on the above background, this study will be conducted to design a frame tube bike composite for reducing stress and deformation based on CEN 14766 standards test methodology [2]. 2. METHODOLOGY The design analysis by using FEM software is used to model frame tubes with shell elements. Figure 1 shows the frame A Study on Design of Frame Tube Bike Composite for Reducing Stress and Deformation Based on CEN 14766 Standards Test Methodology Hamzah Ibnu Yasin 1 , Gaguk Jatisukamto 2 , Mahros Darsin 3 , 1 Student, Mechanical Engineering, Jember University, Indonesia, 201920101003@students.unej.ac.id 2 Assistant Professor, Mechanical Engineering, Jember University, Indonesia, gaguk.ft@unej.ac.id 3 Associate Professor, Mechanical Engineering, Jember University, Indonesia, mahros.teknik@unej.ac.id ISSN 2347 - 3983 Volume 9. No. 2, February 2021 International Journal of Emerging Trends in Engineering Research Available Online at http://www.warse.org/IJETER/static/pdf/file/ijeter07922021.pdf https://doi.org/10.30534/ijeter/2021/07922021