Numerical simulation of dynamic fracture toughness tests on the compact tension specimen loaded by SHTB

作者：Zou, Guangping^*; Shen, Xinhui; Zhao, Weiling; Wu, Lifu; Chang, Zhongliang

来源：Journal of Harbin Engineering University, 2015, 36(7): 917-921.

DOI：10.3969/j.issn.1006-7043.201404076

• Compact tension specimen
• Dynamic fracture toughness
• Impact fracture
• J integral
• Stress state
• Tension bar

There is no testing standard for the dynamic fracture toughness of materials for specimens because of its complexity. In order to solve the dynamic fracture test problem of metal, a method was presented for testing the dynamic fracture toughness of a compact tension (CT) specimen in this paper. The dynamic fracture tests on the CT specimen loaded by the modified split Hopkinson tension bar (SHTB) were simulated using ANSYS/LS-DYNA. Propagation of stress waves in the specimen, fracture initiation time and stress equilibrium conditions were analyzed. The result illustrated that the entire load process can satisfy the one-dimensional stress wave assumption, which validates the method is feasible. By the same method, the dynamic fracture toughness of the CT specimen is obtained under the condition of this experimental installation.

• 单位
  哈尔滨工程大学