Analysis on the dynamic extension for transverse surface cracks in the as-cast steel slab at high temperatures

作者：Shen, Jialong; Long, Mujun^*; Chen, Dengfu; Zhang, Jian; Dong, Zhihua

来源：Engineering Failure Analysis, 2016, 66: 341-353.

DOI：10.1016/j.engfailanal.2016.05.002

• Transverse cracks
• Dynamic extension
• Extended finite element
• Continuous casting slab

The fracture toughness test is carried out at high temperatures (800-1200 degrees C) to study the critical value of J-integral (J(IC)) for the as-cast steel slab. Extended finite element method (XFEM) is used in an Abaqus model to study the dynamic extension of transverse surface cracks during the straightening and bending process of the as-cast steel slab. Results show that the ductile fracture toughness decreases from 26.75 to 3.46 N/mm as the temperature increases from 800 to 1200 degrees C. Transverse surface cracks (vertical to the casting direction) on the outer and inner arc surface of the slab extend 27.3 mm and 23.4 mm for the maximum when the slab is bending and straightening, respectively. The extended length is analysed corresponding to the position where the slab passes through bending and straightening rollers. The results show that the extended length increases largely at the end of the bending or straightening process, which indicates the stress distribution at the bending roller 15#, and the straightening roller 59#, 60# are overlarge and should be optimized.

• 出版日期2016-8
• 单位重庆大学