The Theory of Materials Failure by Richard M. Christensen

By Richard M. Christensen

A whole and accomplished idea of failure is constructed for homogeneous and isotropic fabrics. the whole variety of fabrics kinds are coated from very ductile metals to super brittle glasses and minerals. failure houses suffice to foretell the final failure stipulations less than all states of rigidity. With this beginning to construct upon, many different elements of failure also are taken care of, comparable to extensions to anisotropic fiber composites, cumulative harm, creep and fatigue, and microscale and nanoscale ways to failure.
В данной монографии изложена разработанная автором теория прочности для однородных изотропных материалов.

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In principal stress space the geometric form of this failure criterion is that of a paraboloid as shown in Fig. 1. The axis of symmetry of the paraboloid makes equal angles with the three principal stress axes. 6. The Constitutive Equations of Failure, Part B: Fracture Criterion 39 σ2 σ1 σ3 Fig. 1 Polynomial-invariants paraboloid in principal stress space. Important though it is, this paraboloidal, polynomial-invariants criterion is not the complete and sole failure criterion that controls all possible failure occurrences.

6] B¨oker, R. (1915). “Die Mechanik der Bleibenden Formanderung in Kristallinish Aufgebauten Korpern,” Mitteilungen Forschungsarbeit auf dem Gebeite Ingenieurwesens, 24, 1–51. 4 The Failure Theory for Isotropic Materials All the results in this book are pivotally dependent upon the developments in this chapter. It contains the derivation (not postulation) of the failure theory for homogeneous and isotropic materials. The first two sections involve the construction of helpful steps that naturally lead to the derivation.

This geometric characteristic ensures that there will not be any physical discontinuities in behavior as T/C is varied across the region where the fracture criterion commences, T/C = 1/2. For T/C < 1/2 the three fracture planes cut sections out of the paraboloid. For these values of T/C very near to 1/2, these sections or slices cut from the paraboloid are very small, but they increase in size 42 The Failure Theory for Isotropic Materials as T/C diminishes. All these effects will be illustrated and amply discussed in Chapter 5, and the experimental verification will be taken up in Chapter 6.

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