STRUCTURAL PERFORMANCE OF A RAILWAY TRUSS BRIDGE MODEL: DESIGN, FABRICATION AND MODEL TESTING.

This bachelor's thesis focuses on the design, fabrication, and analysis of a truss bridge made of aluminum metal. The truss bridge is first designed theoretically as 2D truss bridge, and it is redesigned as 3D and optimized using SAP2000

STRUCTURAL PERFORMANCE OF A RAILWAY TRUSS BRIDGE MODEL: DESIGN, FABRICATION AND MODEL TESTING.

This bachelor's thesis focuses on the design, fabrication, and analysis of a truss bridge made of aluminum metal. The truss bridge is first designed theoretically as 2D truss bridge, and it is redesigned as 3D and optimized using SAP2000. Once the truss bridge is fabricated, the experimental test (strain measuring) takes place using Strain-gauges

Mechanical Testing And Finite Element Analysis Of 3D Printed Continuous Carbon Fiber Reinforced Onyx® Thermoplastic

Master's thesis in Mechanical EngineeringWhile Additive manufacturing (AM) has been limited in prototyping and research areas, this technology has several advantages and significant potential to revolutionize nowadays conventional manufacturing processes. In recent years, several materials, including metals has been studied and tested in AM. However, polymers are the dominating currently available commercial materials. Polymers have low strength and stiffness, and their implementation in engineering applications that require high strength and stiffness is limited. However, by introducing a strengthening fiber, the polymer based material can turn into a stronger and stiffer material, namely, composite materials. Currently, it is commercially possible to fabricate small size components from two or more filament materials using desktop 3D printers. However, there is limited understanding, on the material properties of the composites, produced by the 3D Print technology. To overcome this, there is a demand of several research both on the 3D printing processes and the material properties. This study was meant to provide more understanding on the parts fabricated from composite materials using 3D printer. Therefore, mechanical properties of 3D fabricated composite samples using Markforged® Mark-Two 3D printer were investigated. Tensile and flexural test had been carried out and the results were validated with Finite Element Analysis (FEA) results carried in ANSYS Mechanical Parametric Design Language (APDL) 17.0. Furthermore, carbon fiber (CF) as reinforcing, and “Onyx” as matrix materials were used in the fabrication of the test samples. The tensile and flexural samples was fabricated with a fiber volume fraction of about 62% and 42%, respectively. Furthermore, the tensile samples provided 559.90 MPa and 25.04 GPa in maximum tensile strength and tensile modulus, respectively. Whereas 270.70 MPa in maximum flexural strength and 16.42 GPa in flexural modulus were achieved by the flexural samples. The obtained tensile strength and modulus results had a standard deviation of 17 MPa and 2.65 GPa, respectively. While the flexural strength and modulus results had a corresponding standard deviation of 28.30 MPa and 1.35 GPa. For comparison reasons, the ultimate tensile strength of 6061-T6 Aluminum, commonly used for bike frames, is 310 MPa . The tensile strength of composite samples in this study was about 80% higher than the strength of Al6061-T6. However, the tested samples contain high fiber volume fraction

Strength analysis of 3D printed carbon fibre reinforced thermoplastic using experimental and numerical methods

A study of strength of composite materials produced by 3D printing technology is presented. The samples fabrication and tests to determine the strength both in bending and in tension of the composite materials have been carried out. The composite samples were additively manufactured using Markforged® 3D printer of type Mark-Two. The fabricated composite samples were of carbon fiber filament combined with a thermoset plastic matrix, by its producer named “Onyx”. The tests provided sample mean value for the ultimate tensile strength of 560 MPa and the tensile modulus of 25 GPa. Based on the three point bending tests the ultimate flexural strength of 271 MPa and flexural modulus of 16 GPa were estimated. The tests are reported and discussed in view of stress analysis modeling the layered composite with finite element models.publishedVersio