Abstract: PLA-Epoxy and PLA-Epoxy-Alumina reinforced composites are employed in various mechanically demanding applications. Polylactic acid (PLA) with epoxy resin form PLA-Epoxy composite. The matrix material epoxy resin gives the composite mechanical characteristics. However, PLA reinforces the composite's strength and rigidity. Production of a PLA-Epoxy-Alumina reinforced composite involves adding alumina particles to the matrix. Alumina particles reinforce the composite's mechanical strength and stiffness. A PLA-Epoxy-Alumina reinforced composite has better mechanical strength. Adding alumina particles to the composite increases its strength and stiffness, reducing stress-induced deformation and failure. Testing a composite material's tensile, compressive, and flexural strengths to determine its mechanical strength is routine. Alumina particles improve PLA-epoxy composite tensile, compressive, and flexural strength. However, many other factors affect composite material mechanical strength. The size, shape, and distribution of reinforcing particles, matrix material quality, and composite manufacturing technology all matter. As noted before, the above metrics are essential when comparing composite material mechanical strength.

Keywords: Composite materials, Mechanical strength, PLA-Epoxy composite, PLA-Epoxy-Alumina composite, Reinforced composites, Alumina particles, Matrix material.

| DOI: 10.17148/IARJSET.2023.10832