نتایج جستجو برای: fracture dynamic propagation

تعداد نتایج: 597292  

The permeability and coupled behavior of pore pressure and deformations play an important role in hydraulic fracturing (HF) modeling. In this work, a poroelastic displacement discontinuity method is used to study the permeability effect on the HF development in various formation permeabilities. The numerical method is verified by the existing analytical and experimental data. Then the propagati...

Journal: :Chaos 2008
Pedro M Reis Basile Audoly Benoit Roman

When a blunt cutting tool is forced through a thin elastic sheet that is held along its lateral boundaries, a strikingly regular wavy cut can be left behind, examples of which are presented in Fig. 1. The thin film is brittle, hence it undergoes negligible irreversible deformation besides fracture. For tools much wider than the film’s thickness, the crack tip follows a highly reproducible nonsi...

Journal: : 2022

To maintain the functionality of fan blades, it is important to know distribution dynamic stresses in blade, their amplitude and vibration frequency. Understanding loading pattern will allow us determine under what conditions engine was operated, identify prevent emergencies that could lead blade fracture. The purpose this work understand cause fracture occurred during ground start. Due fractog...

A.R. Khoei, M. H. Pourmatin

In this paper, the mechanical behavior of three-phase inhomogeneous materials is modeled using the meso-scale model with lattice beams for static and dynamic analyses. The Timoshenko beam theory is applied instead of the classical Euler-Bernoulli beam theory and the mechanical properties of lattice beam connection are derived based on the continuum medium using the non-local continuum theory. T...

2010
H. N. G. Wadley C. B. Scruby

Acoustic -emission techniques are beginning to be frequently used as a means of detecting and locating deformation and fracture processes in both metallic and non-metallic engineering structures. This has happened despite a relatively poor understanding of the basic physical processes involved in the generation, propagation, and detection of acoustic -emission signals, and of the influence in m...

1999
Jerome T. Tzeng

The fracture behavior of a composite cylinder subjected to a moving pressure has been investigated. The resonance of stress waves can result in very high amplitude of strains in the cylinder at the instant and location of pressure front passage when the velocity of the moving pressure approaches a critical velocity. The stress wave with high magnitude, while short in duration, might not cause s...

In this work, we used a grain-based numerical model based on the concept of lattice. The modelling was done to simulate the lab experiments carried out on the mortar samples. Also the analytical solutions corresponding to the viscosity-dominated regime were used to estimate the fracture length and width, and the results obtained were compared with the numerical simulations. As the analytical so...

Journal: :trauma monthly 0
ahmad yousefi orthopedic and trauma research center, shahid kamyab hospital, mashhad university of medical sciences, ir iran hami ashraf orthopedic and trauma research center, shahid kamyab hospital, mashhad university of medical sciences, ir iran ali mashhadinezhad orthopedic and trauma research center, shahid kamyab hospital, mashhad university of medical sciences, ir iran ali birjandinejad orthopedic and trauma research center, shahid kamyab hospital, mashhad university of medical sciences, ir iran ; orthopedic and trauma research center, shahid kamyab hospital, mashhad university of medical sciences, ir iran

abstract traumatic hip dislocations are common in high-energy motor vehicle accidents. we present a case of a 43-year old man who sustained posterior hip dislocation with posterior wall acetabular fracture and ipsilateral intertrochantric fracture following a motorcycle accident. urgent open reduction and internal fixation of the hip fracture-dislocation and fixation of intertrochantric fractur...

2017
Lei Zhou Junchao Chen Yang Gou Wentao Feng

In this paper, a numerical study is conducted to investigate the stress shadow effects (stress reorientation and change) during hydraulic fracturing in a transverse multiple fracture system. A numerical model is used for the numerical study. It is a 3D model and can simulate the fracture operation from injection begin to full closure (fracture contact). Therefore, there is no need to assume the...

Journal: :Journal of the mechanical behavior of biomedical materials 2014
Alessandra Carriero Elizabeth A Zimmermann Sandra J Shefelbine Robert O Ritchie

Bone fracture is a health concern for those with aged bone and brittle bone diseases. Mouse bone is widely used as a model of human bone, especially to investigate preclinical treatment strategies. However, little is known about the mechanisms of mouse bone fracture and its similarities and differences from fracture in human bone. In this work we present a methodology to investigate the fractur...

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