The significance of a crack growth law for a C(T) fracture specimen undergoing stable crack extension

被引：1
作者：
Materials Science Department, Universidad Santa Maria, Valparaiso, Chile [1 ]
不详 [2 ]
机构：
[1] Materials Science Department, Universidad Santa Maria, Valparaiso
[2] MABE Department, University of Tennessee, Knoxville, TN
来源：
J. ASTM Int. | 2008年 / 10卷
关键词：
Common format; Elastic-plastic fracture; Normalization; Stable crack growth;
D O I：
10.1520/JAI101546
中图分类号：
学科分类号：
摘要：
A new method of construction of the J-R curve has been proposed recently that makes use of a postulated crack growth law relating stable crack extension, Δa, to plastic displacement, vpl. An analytical treatment of both the J-Δa curve and the force-displacement, P-v, curve, is now possible even under circumstances in which the sole inputs are the P-v curve and the initial and final crack size values. Based upon this crack growth law concept, and on the common and the concise format equations of Donoso and Landes, an alternative way of estimating the amount of stable crack growth is presented. This alternative method, which allows for the evaluation of the crack size at any value of force or displacement along the P-v curve, has been applied to some examples of C(T) fracture test specimens that have crack extension values obtained by the unloading compliance method. The results are quite encouraging, and the method Is extended here to cases in which there are no crack extension measurements available. Copyright © 2008 by ASTM International.
引用
收藏
相关论文
共 10 条
  • [1] Pehrson B.P., Landes J.D., A Direct estimate of jic from the load versus the load-line displacement record, Fatigue Fract. Eng. Mater. Struct., 30, 2, pp. 73-86, (2007)
  • [2] Donoso J.R., Y Landes J.D., A unifying principle for evaluating fracture toughness in the elastic and plastic regimes with two-dimensional fracture specimens, Fatigue and Fracture Mechanics, 30th Volume, pp. 34-50, (2000)
  • [3] Donoso J.R., Y Landes J.D., Common format for developing calibration curves in elasticplastic fracture mechanics, Eng. Fract. Mech., 47, 5, pp. 619-628, (1994)
  • [4] Donoso J.R., Y Landes J.D., Advantages of the concise k and compliance formats in fracture mechanics calculations, Fatigue and Fracture Mechanics, 32nd Volume, pp. 261-278, (2001)
  • [5] Donoso J.R., Zahr J., Landes J.D., Construction of J-R curves using the common and concise formats, ASTM Special Technical Publication, 1461, pp. 323-339, (2005)
  • [6] Donoso J.R., Landes J.D., An instability analysis for a crack growth situation based on the common format, ECF15, 15th European Conference on Fracture, (2004)
  • [7] Ernst H.A., Paris P.C., Landes J.D., Estimations on j-integral and tearing modulus t from a single specimen test record, Fracture Mechanics
  • [8] Thirteenth Conference 743, pp. 476-502, (1981)
  • [9] Donoso J.R., Y Landes J.D., The role of constraint on the calibration functions for the prediction of ductile fracture behavior in structural components, Int. J. Fract., 63, pp. 275-285, (1993)
  • [10] Joyce J.A., Link R.E., Effects of Tensile Loading on Upper Shelf Fracture Toughness, (1994)
1