Measuring the dynamic elastic properties of anisotropic materials to characterize the mechanical behaviour of products manufactured by additive processes

• Autor(a) principal: Ramalho, Armando
• Data de Publicação: 2023
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.11/8563
• topic: Dynamic elastic properties; Tough PLA; Anisotropy; Impulse excitation

The use of additive processes in the manufacture of prototypes and structural components, or machine parts, had a great growth in the last decade. The use of new materials adapted to the requirements of use, with environmental sustainability and enabling the production of complex geometries, has leveraged additive manufacturing processes. The layer-by-layer slicing sequence of these manufacturing processes are prone to introducing anisotropy into the materials. The mechanical characterization of anisotropic materials through classical tests is not always the most suitable for this purpose, given the economic aspects, the time required, precision requirements and, sometimes, the technological difficulties of the tests. The ASTM E 1876 – 01 standard presents a method for determining the dynamic elastic properties of materials by impulse excitation of vibration, at room temperature. Although the presented methodology is specifically suitable for isotropic materials, it is also mentioned that the methodology can be adopted for the use of anisotropic and non-homogeneous materials, requiring in this case additional care in the interpretation of the results. This speech will present the methodology adopted to obtain the dynamic Young’s Modulus, Shear Modulus, and Poisson’s Ratio by impulse excitation of vibration, of materials obtained by 3D printing. The obtained properties are used in the simulation of the mechanical behaviour of components under in-service conditions, through the finite element method.