| 摘要 |
<p>The purpose of the present invention is to provide a method for evaluating the indentation fracture toughness of brittle materials based on finite element analysis (FEA) solutions, which is capable of evaluating the indentation fracture toughness of brittle materials based on indentation crack characteristics observed with a crack analysis applied with a cohesive zone model (CZM). To achieve this, the method for evaluating the indentation fracture toughness of brittle materials based on FEA solutions comprises the steps of: presenting standards defining the″well-developed″crack of a material; selecting strainε_o, a Poisson′s ratioν, and a Young′s modulus E absolute value as indentation variables affecting the size of a crack in the material, and presenting an indentation fracture toughness formula using the regression relationship among theε_o, the v and, E_R (=E/E_1000) and K_o (=P_max/c^3/2); excluding the influence of the Young′s modulus using an indentation contact length a of the material, and presenting a fracture toughness formula using the relationship among theε_o, the v and k(=P_max/c^ia^1.5-i); and presenting a regression function using E/H, a ratio of the Young′s modulus E to hardness H, and the Poisson′s ratioνin order to obtain theε_o.</p> |
