Fracture mechanics approach

Bundy, K. J. and Desai, V. H., Studies of Stress-Corrosion Cracking Behaviour of Surgical Implant Materials using a Fracture Mechanics Approach , in Corrosion and Degradation of Implant Materials, second symposium , (Eds) A. C. Fraker and C. D. Griffin, 73-90, ASTM Publication STP 859, Philadelphia (1985)... 

The stress corrosion resistance of maraging steel has been evaluated both by the use of smooth specimens loaded to some fraction of the yield strength and taking the time to failure as an indication of resistance, and by the fracture mechanics approach which involves the use of specimens with a pre-existing crack. Using the latter approach it is possible to obtain crack propagation rates at known stress intensity factors (K) and to determine critical stress intensity factors (A iscc) below which a crack will not propagate (see Section 8.9). 

An improved model based on a fracture mechanics approach... 

There are many features in the analysis of the fiber push-out test which are similar to fiber pull-out. Typically, the conditions for interfacial debonding are formulated based on the two distinct approaches, i.e., the shear strength criterion and the fracture mechanics approach. The fiber push-out test can be analyzed in exactly the same way as the fiber pull-out test using the shear lag model with some modifications. These include the change in the sign of the IFSS and the increase in the interfacial radial stress, (o,z), which is positive in fiber push-out due to expansion of the fiber. These modifications are required as a result of the change in the direction of the external stress from tension in fiber pull-out to compression in fiber push-out. 

Pally, 1, and Stevens, D, (1989). A fracture mechanics approach to the single fiber pull-out problem as applied to the evaluation of the adhesion strength between the fiber and the matrix. Adhesion Sci. Technol. 3, 141-153. 

Zhou, L.M.. Kim, J.K. and Mai, Y.W. (1992a). Interfacial debonding and fiber pull-out stresses Part II. A new model based on tbe fracture mechanics approach. J. Mater. Sci. 11, 3155-3166. 

Matrix cracking and the ultimate composite strength can be analyzed using a number of approaches, but we will utilize the fracture mechanics approach so that we can compare the results with those we developed in Sections 5.2.1.2 and 5.2.3.1 for... 

Thermosetting epoxy polymers are widely employed in structural engineering applications and thus a knowledge of the mechanics and mechanisms of the fracture of such materials is of vital importance. The present Chapter discusses the fracture of epoxy polymers, concentrating on the use of a continuum fracture mechanics approach for elucidating the micromechanisms of crack growth and identifying pertinent failure criteria. 

In this fracture mechanics approach, the rate of crack growth is a function of the maximum value of tearing energy attained during the fatigue cycle. For a strip with an edge or central cut cycled in tension, a relation between cycles to failure and the initial cut size for the case where that cut is relatively very small can be derived8,9 ... 

The publication of the ISO and equivalent standards was expected to encourage more workers to apply the fracture mechanics approach which underlies them to the prediction of fatigue in rubber products, although the standard itself does not in fact go into the fracture mechanics theory. Judging from the very considerable volume of literature that has been generated, there has been success in this direction. 

Examples of accounts of applying the fracture mechanics approach to the fatigue behaviour of rubbers are given in references 15-19. In a review of testing methodology for reinforced rubber composites20 it is concluded that... 

The Fracture Mechanics Approach. This was developed to describe the crack growth rate. Paris proposed a law ... 

Fracture mechanics approach. Fracture mechanics provides the basis for many modern fatigue crack-growth studies. AK is the stress intensity range (kjnilx-kjnm) where K is the magnitude of the mathematically ideal crack-tip stress field in a homogeneous linear-elastic body and is a function of applied load and crack geometry. 

J. Landes and J. Begley, A Fracture Mechanics Approach to Creep Crack Growth, in Mechanics of Crack Growth, ASTM Technical Publication 590, The American Society for Testing and Materials, Philadelphia, PA, 1976, pp. 128-148. 

Marshall GP, Culver LE, Williams JG (1970) Craze growth in poly(methyl methacrylate) a fracture mechanics approach. Proc R Soc Lond A Math Phys Eng Sci 319(1537) 165-187... 

Moskala EJ (1998) A fracture mechanics approach to environmental stress cracking in poly (ethyleneterephthalate). Polymer 39(3) 675-680... 

Extensive in situ observations of failure processes within model single asperity contacts demonstrate the relevance of fracture mechanics approaches to the analysis of cracking processes within sliding contacts involving brit-... 

Figure 9 shows the debonding at the crack tip at various fractions of maximum applied load in a three point notch bend test. The debonding at the crack tip starts at loads less than 30% of maximum load. The size of the damage zone can be predicted using a fracture mechanics approach. Table III lists the comparison of measured damage zone size to the theoretically predicted values. The correlation between experimen-... 

The growth behavior of surface crazes has been intensively studied in various polymers (e.g. 6-80) jjjg fracture mechanics approach provides a basis for an analytical description of the growth in front of a crack tip (e.g. In this Section... 

---