Hot isostatic pressing sinter, Si3N4, Scratching, Grinding, Residual bending strength, Ocean engineering, TC1501-1800, Mechanical engineering and machinery, TJ1-1570

Abstract Any product must undergo precise manufacturing before use. The damage incurred during the manufacturing process can significantly impact the residual strength of the product post-manufacturing. However, the relationship between residual bending strength and manufacturing-induced damage remains unclear, despite being a crucial parameter for assessing material service life and performance, leading to a decrease in product performance reliability. This study focuses on investigating the impact of crack generation on residual bending strength through theoretical and experimental analyses of scratching, grinding, and three-point bending. The research first elucidates the forms and mechanisms of material damage through scratch experiments. Subsequently, using resin-bonded and electroplated wheels as case studies, the influence of different process parameters on grinding damage and residual bending strength is explored. The reduction of brittle removal can lead to a 50%–60% decrease in residual bending strength. Lastly, a model is developed to delineate the relationship between processing parameters and the residual bending strength of the product, with the model exhibiting an error margin of less than 11%. This model clearly reveals the effect of crack generation under different process parameters on residual flexural strength.