裂尖张开位移与伸张区宽度的关系
The Relationship between Crack Tip Opening Displacement and Stretch Zone Width
摘 要
采用屈服强度在138~878 MPa之间的几种材料的试验数据,考查了前人提出的材料性能对伸张区宽度与裂尖张开位移比值(WSZ/δ)的影响规律.结果表明:Prantl提出WSZ/δ的值与材料的应变硬化指数和屈服强度之间的关系与试验结果吻合较差,根本原因在于其推导过程中采用的假设前后矛盾.WSZ/δ值与流变应力呈近似线性关系,而不是呈正比关系.
伸张区宽度
流变应力
crack tip opening displacement
stretch zone width
flow stresss
Abstract
The relationships between WSZ/δ value and properties of materials proposed by some investigations are discussed by using experimental data of several materials whose yield strength is in a range of 138-878 MPa.The influences of strain-hardening exponent and yield strength on WSZ/δ value suggested by Prantl do not have a good agreement with experimental data.The major reason should be that some assumptions used in the deduction process are contradictory.The WSZ/δ value seems to be linear instead of proportional to flow stress.
中图分类号 TB302.3
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收稿日期 2005/5/12
修改稿日期 2005/7/19
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备注尹建成(1978-),男,河南扶沟人,博士后.
引用该论文: YIN Jian-cheng,LIU Rui-tang,HAO Li-li,ZHOU Zhi-fang. The Relationship between Crack Tip Opening Displacement and Stretch Zone Width[J]. Materials for mechancial engineering, 2006, 30(10): 5～7
尹建成,刘瑞堂,郝丽丽,周志方. 裂尖张开位移与伸张区宽度的关系[J]. 机械工程材料, 2006, 30(10): 5～7
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参考文献
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【15】Shih C F.Relationships between the J-integral and the crack opening displacement for stationary and extending cracks[J].J Mech Phys Solids,1981,29(4):305-326.
【2】Cao W D,Lu X P.On the relationship between the geometry of deformed crack tip and crack parameters[J].International Journal of Fracture,1984,25:33-52.
【3】Hopkins P,Jolley G.The significance of crack tip blunting (stretch zones) in fracture toughness specimens[J].Fracture and the Role of Microstructure[C].London:Chameleon Press,1982.3-10.
【4】Luis Rogerion de o.Hein,Ammann J J,Ana Maria M Nazar.Boundary identification criteria and geometry analysis of Al7050 stretch zone from election profiles[J].Materials Characterization,1999,43:21-26.
【5】Mills W J.On the relationship between stretch zone formation and the J integral for high strain-hardening materials[J].Journal of Testing and Evaluation,1981,9(1):56-62.
【6】Sreenivasan P R,Ray S K,Vaidyanathan S,et al.Measurement of stretch zone height and its relationship to crack tip opening displacement and initiation J-value in an AISAI 316 stainless steel[J].Fatigue & Fracture of Engineering Materials & Structures,1996,19(7):855-868.
【7】Kolednik O,Stuwe H P.An extensive analysis of a J1c–test[J].Engineering Fracture Mechanics,1986,24(2):277-290.
【8】Otsuka A,Miyata T,Nishimura S,et al.Crack initiation from a sharp notch and stretched zone[J].Engineering Fracture Mechanics,1975,(7):419-428.
【9】Yin S W,Gerbrands R A,Hartevelt M.An investigation of the blunting line[J].Engineering Fracture Mechanics,1983,18(5):1025-1036.
【10】Pandey R K,Sundaram P,Kumar A N.A stretched zone method for CTOD evaluation[J].International Journal of Fracture,1991,47:R29-R32.
【11】Prantl G.Equations for COD blunting lines[J].International Journal of Fracture,1986,32(1):R7-R10.
【12】杨宗发,陈正新,王文彬,等.J1c测试中伸张区的测定[J].清华大学学报,1983,23(1):39-47.
【13】Schwalbe K H,Heerens J.Suggestions for a modification of ASTM E813[J].Elastic-Plastic Fracture Test Methods:The User’s Experience,ASTM STP856[C].Philadelphia,PA:American Society for Testing and Materials,1985.411-416.
【14】Heerens J,Schwalbe K H,Cornec A.Modifications of ASTM E813-81 standard test method for an improved definition of J1c using new blunting-line equation[A].Fracture Mechanics:Eighteen Symposium,ASTM STP 945[C].Philadelphia,PA:American Society for Testing and Materials,1988.374-389.
【15】Shih C F.Relationships between the J-integral and the crack opening displacement for stationary and extending cracks[J].J Mech Phys Solids,1981,29(4):305-326.
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