Analysis of Crack Arrest Under Elastic-Plastic Conditions

AbstractBasic concepts, related to the crack tip driving forces in relation to the material resistance, are analyzed for the elastic and elastic-plastic crack growth condition. This defines the crack initiation and growth conditions, as well as for crack arrest. Environment provides an additional driving force, thereby reducing the mechanical driving force required for the crack to grow. It is shown that (a) crack initiation and its growth are inseparable and (b) the magnitude of the applied and/or internal stresses; their gradients are also important for initiation and continuous growth of a crack. Elastic-plastic crack growth is also analyzed using the discrete dislocation models. The results show that its behavior is similar to that of an elastic crack. These concepts are valid for all subcritical crack growth. Mechanical and mechanical equivalent of chemical forces are defined for estimating the life prediction of a component in service. Failure diagrams are defined based on the extension of classical Kitagawa-Takahashi diagram that bridges the behavior of smooth and fracture mechanics specimens. Connections between crack initiation, growth, arrest, and overload fracture are established via these failure diagrams. Application of these diagrams for engineering components in service is outlined for diagnostic and prognostic purposes.

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Elastic-Plastic Deformation of Flexible Plates with Spatial Frame Structures

Прикладная механика и техническая физика ◽

10.15372/pmtf20180611 ◽

2018 ◽

Cited By ~ 2

Keyword(s):

Plastic Deformation ◽

Frame Structures ◽

Elastic Plastic ◽

Spatial Frame ◽

Flexible Plates

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Elasto-plastic state of curve beam system subjected to complex loading

Vietnam Journal of Mechanics ◽

10.15625/0866-7136/10107 ◽

1996 ◽

Vol 18 (4) ◽

pp. 14-22

Author(s):

Vu Khac Bay

Keyword(s):

Cylindrical Shell ◽

Solution Method ◽

Complex Loading ◽

Numerical Results ◽

Elastic Solution ◽

Plastic State ◽

Curve Beam ◽

Elastic State ◽

Elastic Plastic ◽

Beam System

Investigation of the elastic state of curve beam system had been considered in [3]. In this paper the elastic-plastic state of curve beam system in the form of cylindrical shell is analyzed by the elastic solution method. Numerical results of the problem and conclusion are given.

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