(湘潭大學(xué) 土木工程與力學(xué)學(xué)院，湘潭 411105)
摘 要: 推導(dǎo)Mohr-Coulomb(M-C)和Drucker-Prager(D-P)屈服準(zhǔn)則在不同應(yīng)力狀態(tài)下的表達(dá)式以及它們之間的相互關(guān)系；基于文獻(xiàn)數(shù)據(jù)，比較兩個(gè)準(zhǔn)則描述塊體非晶合金屈服行為的適應(yīng)性，詳細(xì)地闡述了正應(yīng)力與靜水壓力對塊體非晶合金屈服行為的影響。結(jié)果表明：靜水壓力對材料屈服的影響相當(dāng)于一個(gè)疊加的正應(yīng)力，無論是壓縮還是拉伸，均對剪切屈服或斷裂起抑制作用。D–P屈服準(zhǔn)則函數(shù)描述塊體非晶合晶的屈服斷裂比M–C準(zhǔn)則更好。
關(guān)鍵字: 塊體非晶合金；Mohr-Coulomb屈服準(zhǔn)則；Drucker-Prager屈服準(zhǔn)則；正應(yīng)力；靜水壓力
（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
