金属成形中韧性断裂准则的细观损伤力学研究进展

Research Progress of Meso-Damage Mechanics for Ductile Fracture Criterion in Metal Forming

随着韧性材料内细观损伤发展机制的深入研究,细观损伤力学在预测金属材料发生韧性断裂的过程中发挥着越来越重要的作用.与传统的宏观断裂力学不同,细观损伤力学侧重于研究材料内细观损伤的演化对于材料宏观断裂的影响.介绍了细观损伤力学发展的背景;阐述了细观损伤力学的研究现状;探讨了细观损伤力学发展过程中所面临的一些问题和应变梯度塑性理论对于细观损伤力学发展的推动作用.

With the profound research in meso-damage of ductile material, meso-damage mechanics will play more and more important role in forecasting ductile fracture of metal material. Differing from macroscopic fracture mechanics, meso-damage mechanics emphasizes particularly on the influence on macroscopic fracture with the evolvement of meso-damage. The background of meso-damage mechanics was introduced, and an overview on the research and development of meso-damage mechanics was given. Then the key problems for the development of meso-damage mechanics were discussed, and the promotion of mechanism-based strain gradient plasticity theory to the development of meso-damage mechanics was proposed as well.