材料不均匀层对垂直裂纹的作用
A VERTICAL CRACK PENETRATING AN INHOMOGENEOUS MATERIAL INTERLAYER
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摘要: 界面层(或界面相)断裂行为是复合材料细观力学的一个重要问题。本文研究裂纹垂直侵入双材料之间刚度性质呈单调变化的界面层的断裂问题。近似分析与大规模有限元计算均表明:当裂纹从软相一侧跨越界面层时,裂尖应力强度因子不断上升;当裂纹从硬相一侧跨越界面层时,裂尖应力强度因子不断下降。Abstract: Interlayer(or interphase) fracture constitutes an important issue of the micromechanics of composite materials.The present paper studies the fracture behavior of a crack penetrating vertically to an interlayer where the stiffness varies monotonically from one material phase to another material phase.Analytical estimate and full-scaled FEM calculation both indicate that the crack-tip stress intensity factor increases when a crack penetrates the interlayer from the soft material side,and decreases when a crack penetratesthe interlayer from the stiff material side of the bimaterial.
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Key words:
- interlayer /
- fracture /
- vertical penetration
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1 Zak A R,Williams M L.track point stress singularities at a bt-material interface.ASME J Appl Mech,1963.30:142-143
2 Bogy D I3.Two edge-bonded elastic wedges of different materials and wedge angles under surface tractions.ASME J Appl Mech.1971,38:377-386
3 Fenner D N.Stress singularities m composite materials wUh an arbitrarily oriented crack meeting an interface.Int J Fracture,1976.12:705-721
4 Cook T S,Erdogan F.Stresses in bonded materials with a crack perpendicular to the interface.Int J Eng Sci,1972,10;677-697
5 Erdogan F,Biricikoglu V.Two bonded half planes with a crack going through the interface.Int J Eng Sci,1973,11:745-766
6 Atkinson C.The interface crack with contact zone.Int J Fracture,1977,19:131-138
7 Delale F.Erdogan F.On the mechanical modeling of the interfacial region in bonded half-planes.ASME J Appl Mech,1988,55:317-324
8 Yang W.New insights of interfacial fracture mechanics.In:Proc of ICF/FEFG Symposium.ICF/FEFG Symposium.Singapore.1991.Elsevier.1991:51-56
9 Yang W.Shah C F.Fracture along on an mterlaver.lnt J Solids & Structs,1994,31:985-1002
10 Swenson D O,Rau C A JR.The stress distrbution around a crack perpendicular to an interface between materials.Int J Fracture Mech.1970,6:357-356
11 王惠军.界面层断裂力学若干问题研究.北京:清华大学硕士论文,1994,6
12 He M Y,Hutchinson J W.Crack deflection at an interface between dissimilar elastic materials.Int J Solids & Structs,1989,25:1053-1067 -
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