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5.453  Articles
1 of 546 pages  |  10  records  |  more records»
Conventional hydraulic fracturing is not effective in target oil development zones with available wellbores located in the azimuth of the non-maximum horizontal in-situ stress. To some extent, we think that the radial hydraulic jet drilling has the functi... see more

Loss of drilling fluid in fracture formation severely restricts the exploration and development of oil and gas resources. However, for formations with complex fractures, judgment of fracture propagation and choice of appropriate prevention techn... see more

Nondestructive measurements and evaluation has great significance in various domains of science, engineering and technology. The ob- jective of this research is to investigate the anisotropic behavior in a sandstone sample from non-invasive tests using La... see more

In this study, structural design and analysis of a type-3 composite over wrapped pressure vessel used in a military satellite propulsion system is presented. The aim is to design a composite tank lighter than all metal fuel tanks having the same volume. M... see more

This paper presents a theoretical approach to fracture propagation in viscoelastic media, which combines a micromechanical reasoning and macroscopic thermodynamics arguments. Unlike cracks, fractures can be viewed as interfaces that are able to ... see more

The need to employ simulation-based investigations of fracture of civil engineering structures has been emphasised recently in literature. In this paper, three dimensional finite element simulations revealed that the cup and cone fracture process in chann... see more

Concrete is a brittle material with high compressive strength, low tensile strength and poor toughness, where cracks of different degrees and different forms can be developed, which compromises the durability and the lifetime of concrete structures. The c... see more

Presented is a concise summary of recent Northwestern University studies of six new problems. First, the decrease of fracture energy during crack propagation through a boundary layer, documented by Hu and Wittmann, is shown to be captured by a cohesive cr... see more

Functional gradient materials (FGMs) have tremendous potential due to their characteristic advantage of asymptotic continuous variation of their properties. When an FGM is used as a coating material, damage and failure of the interface with the substrate ... see more

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