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<p>One noticeable trend in the modification of structural materials is the reduction of their density and the substitution of steel and aluminum alloys with lightweight composite materials. Microcellular injection molding (MIM) allows obtaining molded parts with reduced density while maintaining the expected mechanical properties. In the paper, the influence of key MIM process parameters on the impact strength of PA66GF30 composites with continuous measurement of force on a pendulum was investigated. Additionally, the obtained results were referred to structural analyses. Thick-walled moldings with a finely porous structure, free from surface defects, were obtained. It was found that the uniform distribution of small pores with an average size ranging from 15 to 25&#xa0;µm had a positive effect on the decrease of the maximum force required to destroy the sample by about 20% and the increase of impact strength by 8.6% in relation to solid, thick-walled elements made of PA66GF30. These effects and the significant influence of injection rate on the impact strength of porous PA66GF30 moldings were also confirmed using one-way ANOVA.</p>

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Effect of critical process parameters on the impact properties of thick-walled PA66GF30 composites obtained by microcellular injection molding (MIM)

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Bartosz Nowinka,
  • Dariusz Sykutera

摘要

One noticeable trend in the modification of structural materials is the reduction of their density and the substitution of steel and aluminum alloys with lightweight composite materials. Microcellular injection molding (MIM) allows obtaining molded parts with reduced density while maintaining the expected mechanical properties. In the paper, the influence of key MIM process parameters on the impact strength of PA66GF30 composites with continuous measurement of force on a pendulum was investigated. Additionally, the obtained results were referred to structural analyses. Thick-walled moldings with a finely porous structure, free from surface defects, were obtained. It was found that the uniform distribution of small pores with an average size ranging from 15 to 25 µm had a positive effect on the decrease of the maximum force required to destroy the sample by about 20% and the increase of impact strength by 8.6% in relation to solid, thick-walled elements made of PA66GF30. These effects and the significant influence of injection rate on the impact strength of porous PA66GF30 moldings were also confirmed using one-way ANOVA.