Publish in OALib Journal
APC: Only $99
The 6061-T651 aluminium
alloy is one of the most common aluminium alloys for marine components and general structures. The stress
intensity factor (SIF) is an important parameter for estimating the life of the
cracked structure. In this paper, the stress intensity
factors of a slant-cracked plate, which is made of 6061-T651 aluminum, have
been calculated using extended finite element method (XFEM) and finite element
method (FEM) in ABAQUS software and the results were compared with theoretical
values. Numerical values obtained from these two methods were close to the
theoretical values. In simulations of crack growth at different crack angles,
the crack propagation
angle values were closer to the theoretical values in
XFEM method. Also, the accuracy and validity of fatigue crack growth curve were much
closer to the theoretical graph in XFEM than the FEM. Therefore, in this paper
the capabilities of XFEM were realized in analyzing issues such as cracks.
In recent years,
numerous researches have been carried out with purpose of predicting motor
vehicle crashes on transportation facilities as freeways and urban or rural
highways. Accident process can be modeled
successfully with assuming a dual-state data-generating process. Based on this
assumption, road components like intersections or road segments have two states
of perfectly safe and unsafe. Zero-inflated regression models are applied to
model accidents usually in cases of preponderance of excess zero data in crash
data. We handle in this research, the investigation into effective factors on
frequency and severity of accidents on urban highways and use crash data of Mash
had-Iran urban highways as a case study. We use in this study, the Poisson,
Negative binomial, Zero-inflated Poisson and Zero-inflated Negative binomial
regression models for modeling accidents, and traffic flow and road geometry
related variables as in dependent variables of models. In addition to
identifying effective factors on crash occurrence probability, we deal with
comparison of models, evaluate and prove the efficiency of Zero-inflated
regression models against traditional Poisson and Negative binomial models.
Short Retraction Notice
Journal of Biomaterials and Nanobiotechnology (JBNB) does not meet author’s publication requirements.
This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. Aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.
The full retraction notice in PDF is preceding the original paper which is marked \"RETRACTED\".