Results 261 to 270 of about 29,843 (305)

The Microcrack-Interacting Model

1999
Experimental evidences show that brittle and quasi-brittle materials, such as rock, ceramic, ice and, to some extent, concrete, undergo profuse microcracking during the evolution of fracture processes. In specimens for laboratory tests, some macroscopic cracks are detected in the proximity of the collapse load, originating either from the propagation ...
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A microcrack model of rock inelasticity part I: Frictional sliding on microcracks

Mechanics of Materials, 1982
A microscopically-based model of brittle-elastic behavior of compressed rock is constructed. The basic hypothesis is that frictional sliding on microcracks, accompanied by the growth of secondary tensile cracks, is the dominant mode of inelasticity at moderate compressive stresses (up to several hundreds of MPa1): microcracks (initially penny-shaped ...
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Microcracks in Crystalline Rocks

1976
The Scanning Electron Microscope (SEM) has become a useful tool in many areas of geologic endeavor. Its great depth of field makes it ideal for the study of rough topographies. In recent years it has been used to study fracture and microcracks in metals and ceramics (Majumdar, 1972) and is now being applied to these same topics in the study of rocks ...
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Microcrack toughening?

Acta Metallurgica et Materialia, 1990
Curtin, W. A., Futamura, K.
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Interface microcrack nucleation

Journal of the Mechanics and Physics of Solids, 1994
Abstract The Zener-Stroh mechanism of microcrack nucleation by a dislocation pile-up or band impinging upon an interface has been believed to be one of the basic mechanisms of microcrack nucleation in polycrystalline materials. In the case of different elastic properties of composite constituents, this problem is accurately solved in the present ...
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The development of microcracks in concrete

Rheologica Acta, 1962
The paper presents the evidence which has shown that microcracks occur in concrete specimens prior to failure and considers the influence of the propagation of these cracks on the ultimate failure of the concrete.
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Microcracking and Damage in Concrete

1991
This review attempts to show how the observation of the physical processes of damage in concrete allow to formulate sound damage mechanics models. Microcracks opening and propagation by successive steps provide concrete with a non linear behaviour and increase the fracture toughness with respect to the hardened cement paste.
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How Do Thermally Induced Microcracks Alter Microcracking Mechanisms in Hong Kong Granite?

Engineering Geology, 2021
Zhijun Wu, Tian Yang Guo, Louis Ngai Yuen Wong   +2 more
exaly  

Robust Principal Component Analysis and Support Vector Machine for Detection of Microcracks With Distributed Optical Fiber Sensors

Mechanical Systems and Signal Processing, 2021
Qingsong Song, Farhad Ansari
exaly  

The Experimental Mechanics of Microcracks

1992
The experimental mechanics of small cracks require high spatial resolution measurements that are only obtained by using the scanning electron microscope. This paper describes how cyclic loading stages developed for the scanning electron microscope have been used successfully to study growing microcracks, both at ambient and elevated temperatures.
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