The aims of the current study are to present computational simulations based on the finite element method in order to determine the lowest viable thickness of materials used to make ceramic samples based on the interface of groups of materials (Ni–Cr/ceramics, alumina/ceramics), and samples made of each of these materials, alone; as well as to report the effect of variation in the stress intensity factor of these interfaces (β). Test conditions were simulated in Abaqus CAE software and mesh features focused the crack tip. Fracture toughness analysis was carried out by simulating the three-point bending test (SEVNB specimen of the Fracture Mechanic standards). Based on the present results, the lowest material thickness necessary to meet the stress intensity requirement at the crack tip was 8 mm of each material, under symmetry condition, for sandwich composition. Such a thickness included fracture process zone (FPZ) size and plastic zone (PZ). Sandwich thickness was enough to maintain the test conditions established for the standards. Samples produced in the present study met the requirements of the fracture toughness test, based on the ASTM E−399 standard - specimens with the lowest possible sandwich thickness were obtained and they met the stress intensity requirements of the crack tip. This finding pointed towards a sample based on using a reduced amount of test materials - such as those used for dental restoration. The lowest material thickness in the sandwich was 8 mm, for all groups of materials, under symmetry conditions. This thickness includes fracture process zone size and plastic zone size. The herein proposed sandwich thickness was enough to maintain the test conditions established by fracture mechanic standards.

当前研究的目的是提出基于有限元方法的计算模拟，以确定用于制造陶瓷样品的材料的最低可行厚度，基于材料组（镍铬/陶瓷、氧化铝/陶瓷）的界面)，以及单独使用这些材料制成的样品；以及报告这些界面的应力强度因子 (β) 变化的影响。在 Abaqus CAE 软件中模拟测试条件，网格特征集中在裂纹尖端。通过模拟三点弯曲试验（断裂力学标准的 SEVNB 试样）进行断裂韧性分析。根据目前的结果，在对称条件下，满足裂纹尖端应力强度要求所需的最低材料厚度为每种材料 8 mm，用于三明治组合。这种厚度包括断裂加工区 (FPZ) 尺寸和塑性区 (PZ)。夹心厚度足以维持为标准建立的测试条件。本研究中生产的样品满足断裂韧性测试的要求，基于 ASTM E-399 标准 - 获得了尽可能低的夹层厚度的样品，它们满足裂纹尖端的应力强度要求。这一发现指向了基于使用减少量的测试材料的样本 - 例如用于牙科修复的材料。对于所有材料组，在对称条件下，夹层中的最低材料厚度为 8 毫米。该厚度包括断裂过程区尺寸和塑性区尺寸。