Design and FEM Analysis of Multilayer Ceramic Capacitors with Improved Bending and Thermal Shock Crack Performance

Abstract

This study presents a finite-element-method analysis of the bending and thermal shock crack performance of multilayer ceramic capacitors (MLCCs) used in automobiles. The stress, strain, and heat flux values were analyzed for different MLCC structures and material parameters using three-point bending test and thermal shock test simulations. Three-dimensional modeling was performed using the actual design values of an MLCC-1005 size and 1 µF capacitance-and simulations were performed after setting the boundary and analysis conditions for the three-point bending and thermal shock tests. Based on the analyzed simulation results, the stress, strain, and heat flux values applicable to the MLCC were compared and analyzed to determine the optimum modeling parameters that could improve its reliability under harsh environmental conditions. This study was able to confirm the structural stress and strain changes, and the results were found to be useful to optimize the design of automotive MLCC devices. KeywordsFinite element method • Heat flux • Multilayer ceramic capacitor • Strain • Stress • Thermal shock • Three-point bending * Jung-Rag Yoon