研究目的
To investigate the constitutive behavior of sintered silver nanoparticles reinforced with SiC microparticles using finite element analysis to simulate nanoindentation responses and determine mechanical properties for improving the reliability of electronic packaging structures.
研究成果
FE analysis effectively simulates nanoindentation of sintered AgNP with SiC reinforcement, allowing determination of constitutive parameters. The optimal SiC content is 0.5 wt.%, yielding lower porosity (14.42%), higher yield strength, and improved mechanical properties. SiC addition increases work-hardening rate but reduces strain hardening exponent. The Young's modulus and hardening capacity influence pile-up deformation. Mechanical properties can be tuned by SiC content for enhanced reliability in electronic devices.
研究不足
The study simplifies the porous microstructure of sintered AgNP to an equivalent solid in FE models, which may not fully capture porosity effects. Surface roughness from porosity affects initial indentation stages, requiring a penetration depth threshold for reliable analysis. The friction coefficient between indenter and material is assumed, and exact values are unavailable. The method relies on fitting and may have uniqueness issues in parameter determination.
1：Experimental Design and Method Selection:
The study uses finite element (FE) analysis to simulate spherical nanoindentation on sintered AgNP samples with varying SiC content. A modified power-law constitutive model is employed to describe elasto-plastic behavior, with parameters determined by fitting experimental nanoindentation data.
2：Sample Selection and Data Sources:
Sintered AgNP samples with SiC weight ratios of
3：0, 5, 0, and 5% are prepared using a synthesis approach involving AgNP-decorated SiC microparticles sintered at 260°C for 30 minutes. Data from nanoindentation tests are used. List of Experimental Equipment and Materials:
Nanoindenter XP (MTS systems Corp.), Berkovich and spherical diamond indenters, scanning electron microscope (SEM), ABAQUS software for FE simulations, and materials include sintered AgNP and SiC microparticles.
4：Experimental Procedures and Operational Workflow:
Nanoindentation tests are performed using a spherical indenter with a radius of
5：9 μm at a strain rate of 05 s?1, with continuous stiffness measurement (CSM) technique. FE models are created in ABAQUS using axisymmetric elements (CAX4R) to simulate indentation, and parameters are fitted to experimental load-penetration depth responses. Data Analysis Methods:
Data are analyzed using numerical regression (e.g., in OriginPro) to fit exponential functions to loading stages, and FE simulations are used to determine constitutive parameters such as yield strength, work-hardening rate, and strain hardening exponent.
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