Strength Analysis of Yttria‐Stabilized Tetragonal Zirconia Polycrystals

Abstract

Tensile strength ofY203-stabilized ZrOz polycrystals (Y-TZP) was measured by a newly developed tensile testing method with a rectangular bar. The tensile strength of Y-TZP was lower than that of the three-point bend strength, and the shape of the tensile strength distribution was quite different from that of the three-point bend strength distribution. It was difficult to predict the distribution curve of the tensile strength using the data of the three-point bend strength by one-modal Weibull distribution. The distribution of the tensile strength was analyzed by two-or three-modal Weibull distribution coupled with an analysis of fracture origins. The distribution curve of the three-point bend strength which was estimated by multimodal Weibull distribution agreed favorably with that of the measured three-point bend strength values. A two-modal Weibull distribution function was formulated approximately from the distributions of the tensile and three-point bend strengths, and the estimated two-modal Weibull distribution function for the four-point bend strength agreed well with the measured four-point bend strength. [

Tensile behavior of tetragonal zirconia micro/nano‐fibers and beams in situ tested by push‐to‐pull devices

“…Tensile strength of zirconia‐based tetragonal ceramics in this work and from literatures 10,11,27–30 …”

“…The obtained tensile strength data of all the fibers and beams tested in this work are summarized in Table 1. The tensile fracture strength data of all the tested fibers and beams are also plotted in Figure 6, together with those of zirconia‐based microfibers and bulk ceramics reported in literature 10,11,27–30 . Only materials with a tetragonal phase are included to avoid any effect from other crystalline phase (e.g., monoclinic or cubic phase).…”

“…For the microstructures with grain boundaries (refer to Figure 7), the tensile strength of micro/nano-fibers in this work and in literatures (∼0.62-2.8 GPa) 29,30 both are higher than those of bulk polycrystal ceramics (∼0.43-0.75 GPa). 10,11,27,28 According to Griffith theory, the tensile strength of brittle ceramics is determined by the critical structural defects (e.g., pre-exist pores). 12,31 The defects defined in Griffith theory is strictly limited to sharp edgedefects.…”

“…GB dominates the nucleation of F I G U R E 7 Tensile strength of zirconia-based tetragonal ceramics in this work and from literatures. 10,11,[27][28][29][30] fracture and therefore controls the fracture strength. 12 Both intergranular and intragranular fractures were observed from the fracture surface of the fibers studied in this work (e.g., Figure 3H and Figure S3).…”

The Mechanical Behaviors of Various Dental Implant Materials under Fatigue

“…On the other hand, the implants made of titanium alloys are known as they lead to failure of the treatment due to high cyclic loading that leads to resorption of the peri-implant bone, which increases the bending moments on implants and the metal fatigue, and so the fracture [36]. In contrast to that problem, the bone resorption is predicted to decrease by usage of the nanotubular TiO 2 surface structure of the cp Ti.…”