By K. B. Broberg (auth.), W. G. Knauss, R. A. Schapery (eds.)

The papers during this quantity signify a substantial cross-section of the sector of fracture mechanics, an affidavit to the breadth of curiosity that Mel and Max Williams' buddies percentage with them. numerous are increased types of papers that got in detailed periods honoring them on the 1997 9th foreign convention on Fracture Mechanics in Sydney, Australia.
the themes taken care of during this quantity could be categorised as follows: dynamic fracture difficulties as seen essentially from a classical continuum viewpoint; research of fairly basic crack geometrics; fracture difficulties of polymers and different quite ductile fabrics; scaling ideas that let extension of effects acquired at one measurement to be translated into habit at varied measurement scales; difficulties facing interactions that produce complicated rigidity fields; fracture difficulties without delay acceptable to composite fabrics; research of rigidity concentrations in anisotropic, elastic solids; and the matter of cracks in skinny plates bending.
This quantity may be of curiosity to engineers and scientists engaged on all elements of the physics and mechanics of fracture.

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After assessing the stability and precision of the independent formulation, we validate the use of the bimaterial spectral scheme for interfacial dynamic fracture problems by investigating the classical 2D problem of a finite non-moving interfacial crack subjected to a sudden uniform loading. 1. STEP LINE LOAD ON THE SURFACE OF A HALF SPACE The case of a step line load suddenly applied on a linearly elastic half space is used here to compare the stability and precision of the combined and independent spectral formulations and to investigate the optimum value of f3 defined in (13).

However, while the two approaches yield identical results and have similar numerical characteristics in the scalar (mode III) case, the vectorial (modes WI) situation is different: as will become apparent hereafter, the stability and precision of the two formulations are quite different. Since the combined formulation has been derived only in the homogeneous case, the comparison described in the next section is performed for the classical homogeneous problem of a simple half space subjected to a sudden tensile and shear line load.

While the near field J continually decreased after reaching a maximum value, the Te* for the identical c = 2 mm reached a steady state value during dynamic crack propagation. W:'O-"--"-''-'--' o 5 Crack Length (mm) 10 15 20 Crack Length (mm) 2024-T3 Specimen 1st Series 7075-T6 Specimen 1st Series Figure 6. Variations in crack opening profiles in Aluminum SEN specimens. 14 It.

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