Method of measurement and determination on fracture toughness of structural materials at high temperature

US9939359B2 · kind B2 · utility

Assignees

• East China University of Science and Technology · CN
• SHANGHAI ELECTRIC POWER EQUIPMENT CO., LTD. SHANGHAI STEAM TURBINE FACTORY · CN

Inventors

• Fuzhen Xuan · Shanghai, CN
• Haitao Wang · Nanhu, CN
• Qiongqi Wang · Shanghai, CN
• Linbo MEI · Shanghai, CN
• Xia Liu · 旧村, CN
• Yuhui HUANG · Shanghai, CN

Key dates

• Filing date: Sep 25, 2014
• Grant date: Apr 10, 2018
• Expiry date: Jan 2, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2203/0069
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Disclosed is a method of measurement and determination on fracture toughness of structural materials at high temperature, comprising: preliminary assessing the ductility of a material based on a high-temperature uniaxial tensile test and the fracture characteristic; designing and manufacturing a CT specimen; conducting a monotonic loading fracture test on the CT specimen at high temperature; modifying a load-displacement curve output by a testing machine; determining a passivation coefficient M for the crack of the structural material; reversely recursing instant load-displacement data pairs corresponding to the instant crack length; calculating a J_R crack extension resistance curve of the tensile test; examining the validity of the J_R crack extension resistance curve and the fracture toughness JIC; calculating the fracture toughness per equivalent of the structural material KIC. The present invention overcomes the difficulty of placing an extensometer inside a high-temperature furnace.