Download PDF by G. C. Sih (auth.): Mechanics of Fracture Initiation and Propagation: Surface

By G. C. Sih (auth.)

ISBN-10: 9401056609

ISBN-13: 9789401056601

ISBN-10: 940113734X

ISBN-13: 9789401137348

The evaluation of crack initiation and/or propagation has been the topic of many previous discussions on fracture mechanics. reckoning on how the selected failure criterion is mixed with the answer of a specific thought of continuum mechanics, the end result may possibly fluctuate over a variety. Mod­ elling of the cloth harm procedure might be elusive if the dimensions point of remark is left undefined. The specification of actual measurement on my own isn't adequate simply because time and temperature additionally play an intimate function. it is just while the latter variables are fastened that failure predictions could be simplified. The unexpected fracture of fabric with a pre-existing crack is a for instance. Barring adjustments within the neighborhood temperature,* the power published to create a unit floor sector of an latest crack could be received by means of contemplating the switch in elastic strength of the method earlier than and after crack extension. any such volume has been often called the serious strength unlock cost, G e, or rigidity depth issue, okay Ie. different parameters, comparable to the crack commencing displacement (COD), path-independent J-integral, and so forth. , were proposed; their relation to the fracture approach is additionally in line with the power free up idea. those one-parameter methods, even though, are not able concurrently to account for the failure technique of crack initiation, propagation and onset of swift fracture. A evaluate at the use of G, ok I, COD, J, and so on. , has been made by way of Sih [1,2].

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Extra resources for Mechanics of Fracture Initiation and Propagation: Surface and volume energy density applied as failure criterion

Sample text

Hence, a realistic 23 Ohapter! 1. Crack tip region. fracture criterion should have the ability to determine the path of failure upon reaching the critical load. The most widely used fracture criterion for assessing the onset of rapid fracture in materials without substantial permanent deformation is that of Griffith [1]. 1) in which D'cr is the critical applied stress, 0 the half crack length, E the elastic modulus, tI Poisson's ratio and 'Y the specific surface energy. 1) is that 'Y for a solid has been used liberally in the literature without a precise definition and frequently misinterpreted.

Bo Bo Q left (Bo)av. 82) 13 Measured and calculated Wllues of the fracture angle. 8° the positive values of 00 correspond to the problem of Figure Lib in which the inclined crack is now under uniaxial compression. 31) contains both the solutions of uniaxial tension (+0') and compression (-0'). 6 for different values of Poisson's ratio. In contrast to tensile loading, where the crack tends to become horizontal, the crack path under uniaxial compression is towards the direction of loading. Such a phenomenon has indeed been observed by Hock and Bieniawski [17J who have tested a number of glass plates with an inclined crack under uniaxial compression.

Fracture criterion should have the ability to determine the path of failure upon reaching the critical load. The most widely used fracture criterion for assessing the onset of rapid fracture in materials without substantial permanent deformation is that of Griffith [1]. 1) in which D'cr is the critical applied stress, 0 the half crack length, E the elastic modulus, tI Poisson's ratio and 'Y the specific surface energy. 1) is that 'Y for a solid has been used liberally in the literature without a precise definition and frequently misinterpreted.

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Mechanics of Fracture Initiation and Propagation: Surface and volume energy density applied as failure criterion by G. C. Sih (auth.)


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