X70钢临界CTOD值ANSYS计算

X70 STEEL CRITICAL CTOD VALUE ANSYS CALCULATION

随着海洋工程的发展,探索海洋油气的项目增多,天然气、石油的输送工程也日渐发展起来。UOE生产工艺下的高强X70钢被广泛运用到油气输运工程中,然后强度越高的钢其断裂韧度越低,需对这种高强钢的断裂韧度值进行确定。材料断裂韧度大小可以用临界裂纹尖端张开位移CTOD(crack tipopening displacement)来度量。临界CTOD是弹塑性断裂力学中重要的参数,其大小直接反映了裂纹尖端材料抵抗开裂的能力,临界CTOD值越大表示材料抗开裂性能越好,反之抗开裂性能越差,确定临界CTOD值意义重大。首先依据BS7448规范对X70钢断裂韧度临界CTOD值进行了测试,然后利用Ansys软件从CTOD定义出发对X70钢临界CTOD进行了计算,实现了试验与模拟的对比分析,可供压力容器和管道生产和结构安全性评估企业借鉴。

With the development of ocean engineering, increase in the number of project exploration of Marine oil and gas, natural gas and oil transportation engineering are increasingly developed. UOE production technology of high strength of X70 steel is widely used in oil and gas transportation project, and then the higher the strength of steel, the fracture toughness is lower. We need to determine the identity of the fracture toughness values. Material fracture toughness size can use critical crack tip opening displacement CTOD （crack tipopening below） to measure. Critical CTOD is important parameters in elastic-plastic fracture mechanics, the size directly reflects the materials ability to resist cracking. The bigger the critical value of CTOD show that the cracking resistance of materials, the better. Determining the critical value of CTOD is of great significance. On the basis of BS7448 specification of X70 steel critical fracture toughness CTOD was tested, and then by using ANSYS software of X70 steel in terms of CTOD define critical CTOD was calculated, and implement the test and simulation comparison and analysis, safety asses.