A new method based on energy principle to predict uniaxial stress-strain relations of ductile materials by small punch testing

作者：Peng, Yun-qiang; Cai, Li-xun^*; Chen, Hui^*; Bao, Chen

来源：International Journal of Mechanical Sciences, 2018, 138: 244-249.

DOI：10.1016/j.ijmecsci.2018.02.011

• Stress-strain relation
• Small punch testing
• Equivalent energy principle
• SPT-SR model
• Tensile strength

Uniaxial stress-strain relations of ductile materials are the most fundamental requirement for the design and safety assessment of structures. In this paper, a novel small punch testing (SPT)-related stress-strain relation (SPT-SR) model is proposed to predict the stress-strain relations of materials on the basis of equivalent energy principle. To examine the validity of the model, numerical simulations by finite element analysis (FEA) with a series of hypothetical materials with different Hollomon's material parameters were carried out. The results demonstrate that the uniaxial stress-strain relations predicted by SPT-SR model from simulated load-displacement curves are in good agreement with the properties of hypothetical materials used in FEA. Furthermore, SPT experiments and tensile tests for four steels (P92, DP600, Q345B, A508-III) at room temperature and 300 degrees C were conducted. The stress-strain relations predicted by SPT-SR model agree well with the tensile results generated from finite element-analysis aided testing (FAT) method. Compared with the tensile strengths obtained by uniaxial tensile tests, they can also be well determined based on the strength coefficient and strain hardening exponent predicted by SPT-SR model.

• 出版日期2018-4
• 单位西南交通大学