Method for determining plane strain fracture toughness of steel

• Main Authors: YANG XIAN, CHEN GUOHONG, CHEN HUAN, KONG MING, ZHANG JIAN, WANG RUOMIN, FANG ZHENBANG, MIAO CHUNHUI
• Format: Patent
• Language: Chinese; English
• Published: 05.02.2021
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention relates to a method for determining the plane strain fracture toughness of steel. The method comprises the following steps: cutting a heat-resistant steel sample into heat-resistant steel sheets with different thicknesses; processing notches on sides of the heat-resistant steel sheets to obtain notched heat-resistant steel sheets; obtaining a load and displacement curve of the notched heat-resistant steel sheets at a set temperature; according to the load and displacement curve, obtaining the load during critical crack instability expansion of the notched heat-resistant steel sheets; obtaining the fracture toughness of the notched heat-resistant steel sheets according to the load; fitting the thickness and fracture toughness of the notched heat-resistant steel sheets to obtain a relational expression of the thickness of the notched heat-resistant steel sheets, the fracture toughness of the notched heat-resistant steel sheets and the notched fracture toughness value of theheat-resistant steel sam