ABSTRACT Deformation intensity analysis for mechanical parts are very important data for machine design. For farm machines, these parameters present difficulties for determination due to its particularities. The Machinery industry searches for advanced technologies to determine the mechanical behavior of parts. This article shows the analysis of the reliability in the application of the laser triangulation technique (LTT) to determine the deformation of the mechanical elements of farm machines. A flat cutting disc with standardized dimension was selected as the object of study, as it is commonly used in farm machines, exhibiting a simple geometry made of steel, making the analysis procedure easier both for experimental execution and for data validation. Displacements of 1.0 mm to 10 mm were applied on the specimen. The theoretical behavior of specimen displacement was defined by finite element modelling with same condition of loading and dimension to compare the generated data by the experimental tests. Results indicated a displacement with maximum variation of 2.56% between experimental data and theoretical results and were considered satisfactory. LTT was able to determine deformation curve behavior of machine elements. It was concluded that Laser Triangulation Technique (LTT) was satisfactory to determine the deformation of a specimen. design machines particularities (LTT study steel validation 1 0 1. tests 256 2 56 2.56 25 5 2.5 2.

Desenvolvimento e otimização de projetos de máquinas agrícolas envolvem a análise de tensão e deformação. Técnicas fotomecânicas de moiré fornecem campo de deslocamento completo do corpo de prova e podem auxiliar no entendimento do comportamento mecânico de peças com geometria complexa. Métodos híbridos associam franjas padrões de deslocamento com mapas de distribuição de tensão e deformação, através de conceitos de teoria da elasticidade. O objetivo deste trabalho foi analisar o uso da técnica de moiré de sombra para determinação qualitativa de distribuição de tensão e deformação em elementos de máquinas de geometria complexa. Os resultados foram comparados com o método de extensometria elétrica e por simulação computacional. Os resultados mostraram que a técnica de moiré de sombra foi bastante confiável para analisar o comportamento mecânico de elementos de máquinas de geometria complexa.

Development and optimization of projects for agricultural machinery involve the analysis of stress and strain. Moiré photomechanical techniques provide a complete displacement field of the specimen under test, and can aid in understanding the mechanical behavior of parts with complex geometry. Hybrid methods combine fringe patterns of displacement with distribution maps of stress and strain through concepts of the theory of elasticity. The objective of this work was to analyse the use of the shadow moiré technique in the qualitative determination of stress and strain distribution in geometrically complex machine elements. The results were compared with those from an electrical extensometer and a computer simulation. The results demonstrated that the shadow moire technique was quite reliable in analysing the mechanical behavior of geometrically complex machine elements.