Computational studies have recently gained significant interest in engineering applications for the virtual monitoring of bone pathologies such as osteoporosis and fracture healing. Several authors have investigated numerically the role of quantitative ultrasound as a diagnostic and monitoring tool of the fracture healing process since ultrasonic techniques are non-invasive and non-ionizing mea...

A series of molecular-dynamics simulations using a many-body interatomic potential has been performed to investigate the behavior under load of several ^001& and ^011& symmetrical tilt grain boundaries ~GB’s! in diamond. Cohesive energies, the work for fracture, maximum stresses and strains, and toughness as a function of GB type are evaluated. Results indicate that special short-period GB’s po...

This study investigates propagation of mode I crack in B70 pre-stressed concrete sleepers by fracture mechanics approach. A new experimental analysis is done for notched B70 pre-stressed concrete sleepers with Replica test and image analysis. A scanning electron microscope test (SEM) and an image analysis are applied for the Replica test in order to determine crack length and crack mouth openin...

Three-point bend fracture tests have been conducted at different loading rates with a quadratic martensitic steel. The failure energy has found to increase rate. To get insights in this numerical investigation undertaken strategies using ABAQUS and IMPETUS softwares order address quasi-static dynamic conditions. Simulations were the software carry out comparative analysis of both implicit expli...

Activating the natural fracture (NF) during hydraulic (HF) propagation is a dominant factor for forming complex network in shale reservoirs. On basis of Renshaw and Pollard’s criterion intersection, we simulate NF stability under dynamic disturbance HF reservoirs with cohesive zone model ABAQUS analyze effects various factors on stability. The results show that activation NFs fracturing control...

Anterior knee pain in athletes is common and usually self limited. There should be a high index of suspicion and low threshold for special imaging in cases with acute onset and specific tenderness. The risk of propagation of stress fracture of the patella in athletes is highlighted. The case report presented illustrates the potential sequence of events.

The effects of particle size, volume fraction and matrix strength on the stress-controlled axial fatigue behavior and the probability of particle fracture were evaluated for 2124 aluminum alloy reinforced with SiC particles. Average particle sizes of 2, 5, 9 and 20/~m and volume fractions of 0.10, 0.20 and 0.35 were examined for four different microstructural conditions. Tensile and yield stren...

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Juha Koivisto Name of the doctoral dissertation Fracture propagation and prediction in heterogeneous materials Publisher School of Science Unit Department of Applied Physics Series Aalto University publication series DOCTORAL DISSERTATIONS 122/2013 Field of research Engineering Physics Manuscript submitted 31 May 2013 Date of ...

Shear failure models have traditionally dominated the research on slab avalanche initiation in snow science, but evidence has accumulated that they tell us only part of the story. In these models weak snowpack layers are regarded as compounds of zero thickness, but in reality they often consist of ice grain aggregates of finite thickness and high porosity. When such granular aggregates fail, th...