Materials and Energy Research Center (MERC) Iranian Ceramic Society (ICERS) Advanced Ceramics Progress 2423-7477 11 3 2025 07 01 Uncertainty Evaluation of Residual Stress Measurement in Toughened Glass Using the Marshall–Lawn Indentation Model 52 58 246405 10.30501/acp.2026.573148.1189 EN Sara Ahmadi Assistant Professor, Construction and Mineral Research Group, Research Center of Technology and Engineering, Standard Research Institute, Karaj, Iran. 0000-0002-3964-2460 Mohammad Mahdi Share Pasand Assistant Professor, Electrical engineering Research Group, Research Center of Technology and Engineering, Standard Research Institute, Karaj, Iran. 0000-0002-6105-6687 Journal Article 2026 01 31 Uncertainty is an inherent component of any measured or model-derived quantity and depends on both the applied mathematical formulation and the uncertainties of its input parameters. Since direct measurement of compressive stress in glass is generally not feasible, mathematical models such as the Marshall–Lawn indentation formula are widely used. In this study, the uncertainty associated with this formula is evaluated following the ISO Guide 98 (GUM) framework. Sensitivity coefficients are obtained from the partial derivatives of the model, and a complete uncertainty budget is constructed based on experimental data and literature-derived inputs. The results provide a traceable and structured uncertainty analysis for estimating residual compressive stress in toughened glass surfaces. https://www.acerp.ir/article_246405_16511bd57ea8542dc29138e2e87bd0d5.pdf