Yapay Zeka Hızlı Bakış & Çıkarımlar
AI InsightThe load-dependent mechanical parameters such as Young’s modulus, yield strength, fracture toughness, brittleness index and elastic stiffness coefficients are also discussed in the text.
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Abstract
The primary aim of this work is to examine the crucial variations of key mechanical design performance properties and mechanical characterization of Bi 2.1 Sr 2.0-x Ti x Ca 1.1 Cu 2.0 O y superconducting ceramic cuprate materials with the aid of Vickers hardness measurements performed at the different applied indentation test loads between the value of 0.245 N and 2.940 N. In this study, all the materials are prepared within the molar ratios of 0≤x≤0.10 by using the ceramic method in the atmospheric air conditions. The experimental measurement results obtained show that the increment of the aliovalent Sr/Ti partial substitution level in the Bi-2212 crystal structure regresses remarkably the key design mechanical performances such as the mechanical strength, stability, stiffness, critical stress, toughness, flexural strengths and mechanical durability. This is attributed to the fact that the existence of Ti impurity in the Bi-2212 main matrix leads to the enhancement in the problematic defects, stress raisers and crack initiation sites based on the crack-producing omnipresent flaws. Accordingly, the propagation of the problematic defects accelerates considerably at relative lower indentation test loads applied, and the problematic defects locate easily in their critical propagation speed. All in all, the defects formed in the crystal matrix by the Ti inclusions are out of control, and the Sr/Ti partial substituted Bi 2.1 Sr 2.0-x Ti x Ca 1.1 Cu 2.0 O y superconducting compounds are much easier broken. Additionally, it is noted that every material produced show the typical indentation size effect but in the reduction trend with enhancing the Sr/Ti partial substitution level. The load-dependent mechanical parameters such as Young’s modulus, yield strength, fracture toughness, brittleness index and elastic stiffness coefficients are also discussed in the text.