Estudo pelo Método dos Elementos Finitos Aplicado à Optimização de Processo em Ferramentas de Prensagem para Colagem Assistida por Pressão de Display Stacks

June 30, 2026

The screen bonding process requires the application of uniform contact pressure to ensure the structural integrity of the optical adhesive and prevent defects, such as air bubbles and delamination. This dissertation investigates the mechanical behavior of a pressing tool whose original geometry exhibits signficant stress gradients at the component’s edges. The central objective of the study was the dimensional and material optimization of the metal tool contributing to an extended operational lifespan. To achieve this goal, a computational model was developed using Abaqus software. The mechanical response of the adhesive was configured through a combination of elastic, hyperelastic and viscoelastic formulations, capturing displacements and the temporal relaxation of stresses. The methodology included a parametric scan with eighteen distinct geometric configurations, plus a material selection stage, culminating in a multi-criteria decision analysis process to balance the overall mass, stress uniformity, and economic feasibility. The numerical results, grounded in statistical analysis of the coefficient of variation, demonstrate the effectiveness of the new architecture in homogenizing the stress field. The minimization of this indicator within the optimal configuration attests that the new geometry effectively mitigates stress concentrations in the metallic tooling. The study concludes that the developed optimization ensures a more homogeneous load transfer, enhancing the tool’s mechanical performance and guaranteeing the overall reliability of the production process.

Authors in the community:

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  P

  Pompílio Morato Camacho

  ist1115510

Supervisors of this institution:

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  A

  Augusto Manuel Moura Moita de Deus

  ist12896

mechanical-engineering - Mechanical engineering

por - Portuguese

Instituto Superior Técnico