By C W Lung, Norman H March
Книга Mechanical houses of Metals: Atomistic and Fractal Continuum methods Mechanical homes of Metals: Atomistic and Fractal Continuum ApproachesКниги Физика Автор: C. W. Lung, Norman H. March Год издания: 1999 Формат: pdf Издат.:World medical Pub Co Inc Страниц: 416 Размер: 2,4 ISBN: 9810226225 Язык: Английский0 (голосов: zero) Оценка:Reader's review:In this e-book the fundamentals of elasticity thought, digital constitution and the fractal description of fractures as an issue of technological significance, are associated with summarize a truly good performed and stylish means of representing the basics of the mechanical habit of fabrics, which isn't constantly obvious from traditional descriptions. An necessary resource to review and seek advice for mechanical engineers, fabrics scientists, physicists, and so forth.
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Extra info for Mechanical Properties of Metals: Atomistic and Fractal Continuum Approaches
For bcc metals, experiments in Fe-Si alloys (Sˇest´ak and Libovick´ y 1963a; 1963b) showed very diﬀerent behaviour. The crss* is strongly dependent on temperature and on the orientation of the applied stress. Surface slip traces are sometimes diﬀuse and wavy, tending to lie parallel to non-crystallographic planes. Curiously, in the twenties, Taylor and his coworkers (1926; 1928) found that in the cases of α-iron and β-brass slips were not conﬁned to low index crystal planes and thereby established evidence of deﬁciencies in the Schmid law.
P. Sethna (Phys. Rev. E55, 7669, 1997) have studied extensively the statistical mechanics of cracks. More speciﬁcally, these workers studied a class of models for brittle fracture, namely elastic theory models that have cracks but do not allow for plastic ﬂow. Their conclusion is that such models display a transition to fracture under applied load that has similarities to the ﬁrst-order liquid-gas transition. 40 Mechanical Properties of Metals Fig. 6. Typical behaviour of a simple elastic solid with damage.
The atomic structure of the tip will dictate whether the crack is a cleaver or an emitter, and the properties of the dislocations and their sources in the medium and their interactions with the crack will determine whether the core of the crack can ever be stressed suﬃciently so that cleavage or emission is possible. 4. The Condition for Intrinsic Brittleness Rice and Thomson (1974) suggested that the condition for intrinsic brittleness in a material is the activation energy for dislocation emission from cracks.