(湘潭大学 土木工程与力学学院，湘潭 411105)
摘 要: 推导Mohr-Coulomb(M-C)和Drucker-Prager(D-P)屈服准则在不同应力状态下的表达式以及它们之间的相互关系；基于文献数据，比较两个准则描述块体非晶合金屈服行为的适应性，详细地阐述了正应力与静水压力对块体非晶合金屈服行为的影响。结果表明：静水压力对材料屈服的影响相当于一个叠加的正应力，无论是压缩还是拉伸，均对剪切屈服或断裂起抑制作用。D–P屈服准则函数描述块体非晶合晶的屈服断裂比M–C准则更好。
关键字: 块体非晶合金；Mohr-Coulomb屈服准则；Drucker-Prager屈服准则；正应力；静水压力
（College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China）
Abstract:The expressions and relationships of the Mohr-Coulomb (M-C) and Drucker-Prager (D-P) yield criteria under various stress states were derived firstly, and the yield behavior adaptabilities of bulk amorphous alloys described by the two criteria were compared based on the data of literatures. Finally, effects of normal stress and hydrostatic pressure on the yield behavior of BAAs were intelligently demonstrated. The results show that the influence of hydrostatic pressure on the yield behavior of BAAs is equivalent to a superposition of normal stress under tensile or compressive load, and either the shear yielding or fracture is inhibited by hydrostatic pressure; The D–P criterion is more suitable for explaining the yielding of BAAs than M–C yielding criterion.
Key words: bulk amorphous alloy; Mohr-Coulomb yield criterion; Drucker-Prager yield criterion; normal stress; hydrostatic pressure
