Influence of Layer-Thickness Proportions and Their Strength and Elastic Properties on Stress Redistribution during Three-Point Bending of TiB/Ti-Based Two-Layer Ceramics Composites

Author:

Khvostunkov Kirill12ORCID,Bazhin Pavel1ORCID,Ni Qing-Qing3,Bazhina Arina1,Chizhikov Andrey1,Konstantinov Alexander1

Affiliation:

1. Merzhanov Institute of Structural Macrokinetics and Materials Sciences, Russian Academy of Sciences, ul. Akademika Osipyana 8, Chernogolovka 142432, Russia

2. Plasticity Theory Department, Faculty of Mechanics and Mathematics, Lomonosov Moscow State University, Moscow 119991, Russia

3. Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China

Abstract

A mathematical model was developed to determine the order of failure of layers in a two-layer ceramics composite and to determine the conditions for achieving the maximum limit load under three-point loading. The model was set in the space of three “bilayer parameters”: the ratio of the thickness of the lower layer to the whole thickness of the beam, the ratio of Young’s moduli of the lower layer to the upper layer, and the ratio of flexural strengths of the materials of the lower layer to the upper layer. The adequacy of the model obtained was confirmed by experimental results on the three-point bending of the experimental specimens. The experimental samples were two-layer composites consisting of a cermet layer TiB/Ti and a layer of α-Ti. The samples were obtained by free self-propagating high-temperature synthesis (SHS) compression and with varying their thickness. The results obtained make it possible to predict in advance which layer, based on the specific bilayer parameters, will trigger the brittle fracture mechanism as well as to set the maximum destructive load of bilayer composites.

Funder

Ministry of Science and Higher Education of the Russian Federation

Publisher

MDPI AG

Subject

General Materials Science,Metals and Alloys

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