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<p>This study investigates the thermal stress distribution in lithium aluminosilicate (LAS) glass-ceramics with varying ZnO-MgO contents through a combined experimental and finite element analysis (FEA) approach. Four compositions (Z0–Z3) were prepared by partial substitution of ZnO and MgO, followed by thermal shock testing via water quenching from 500 to 30&#xa0;°C. Experimental evaluation determined residual strength and thermal shock resistance parameters (R), while thermal stress fields were predicted using a coupled transient thermal-structural FEA model. Maximum principal stress (MPS) values from simulation were correlated with experimental results to assess crack initiation tendencies. The results show that Z2 (0.83&#xa0;wt.% ZnO) exhibits the highest R value (2454&#xa0;°C) and lowest MPS (9.45&#xa0;MPa), indicating improved resistance to thermal cracking. This behaviour is associated with favourable phase composition and microstructural characteristics, which contribute to reduced stress concentration and improved stress distribution during quenching. Increasing ZnO-MgO content to optimal levels effectively minimises surface tensile stresses and enhances residual strength retention. The strong agreement between experimental and numerical findings demonstrates that the combined approach provides insight into the relationship between composition, microstructure, and thermal stress behaviour in LAS glass-ceramics, enabling targeted compositional design for improved thermal shock performance.</p>

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Integrated Experimental-Finite Element Analysis of Thermal Stress Distribution in Lithium Aluminosilicate Glass-Ceramics with ZnO-MgO Compositional Variations

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Husniyah Aliyah Lutpi,
  • Hasmaliza Mohamad,
  • Muhammad Khalil Abdullah

摘要

This study investigates the thermal stress distribution in lithium aluminosilicate (LAS) glass-ceramics with varying ZnO-MgO contents through a combined experimental and finite element analysis (FEA) approach. Four compositions (Z0–Z3) were prepared by partial substitution of ZnO and MgO, followed by thermal shock testing via water quenching from 500 to 30 °C. Experimental evaluation determined residual strength and thermal shock resistance parameters (R), while thermal stress fields were predicted using a coupled transient thermal-structural FEA model. Maximum principal stress (MPS) values from simulation were correlated with experimental results to assess crack initiation tendencies. The results show that Z2 (0.83 wt.% ZnO) exhibits the highest R value (2454 °C) and lowest MPS (9.45 MPa), indicating improved resistance to thermal cracking. This behaviour is associated with favourable phase composition and microstructural characteristics, which contribute to reduced stress concentration and improved stress distribution during quenching. Increasing ZnO-MgO content to optimal levels effectively minimises surface tensile stresses and enhances residual strength retention. The strong agreement between experimental and numerical findings demonstrates that the combined approach provides insight into the relationship between composition, microstructure, and thermal stress behaviour in LAS glass-ceramics, enabling targeted compositional design for improved thermal shock performance.