Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Fracture toughness


A Model for The Prediction of Fracture Toughness Using Neural Network

Aseel abdulbaky; Dhafer Al-Fattal; Harry Bhadeshia; Talal Abdul Jabbar

Engineering and Technology Journal, 2012, Volume 30, Issue 5, Pages 868-885

The purpose of this research programme is to develop quantitative models for the prediction of mechanical properties (fracture toughness) using experimental data collected from the literature, together with a powerful computational technique known as neural network. Creating a truly general model requires a combination of available data and metallurgical knowledge. This model is proposed for martensitic and ordinary bainitic steels in addition to the more recent class of non-structural super-bainitic steels. Super-bainitic steels are
attractive for many applications such as armour. The model of fracture toughness, based on chemical composition, heat treatment an
d mechanical properties is proposed. The predictions of fracture toughness are generally acceptable but the uncertainties
are high and more input data need to be collected for super-bainitic steels when available in the future to improve the predictions of this model.

The Effect of Waste Ceramic Materials ( Iraqi Stones Dust Powders ) on The Mechanical Properties of Epoxy Resin

Fadhil A.Chyad

Engineering and Technology Journal, 2011, Volume 29, Issue 16, Pages 3302-3312

Using waste materials, which have a high pollution on the environment, as an improvement to the properties of a weaken material such epoxy resin become a good achievement. Iraqi stones dust powders have been used to improve the mechanical properties of epoxy resin. Impact strength and fracture toughness from impact test, Young`s modulus from tensile test, Shore hardness, fracture toughness and thermal
conductivity have been investigated. The percentages of the ceramic powders have affected all the above properties and increased the values of them about twice. The highest values were at 12% and then decreased. Also the particle size of this powders has affected these properties, where the lowest particle size (25ìm) has the best values.

Study Some Physical and Mechanical Properties of Ceramic – Ceramic Fibers Composite

Fadhil Attiya Chyad

Engineering and Technology Journal, 2011, Volume 29, Issue 9, Pages 1631-1640

Zirconia fibers have been prepared by convertional method using cotton threads
impregrated in zirconium oxychloride solution ( ZrOCl2. 8H2O ). X-ray
diffraction shows the crystallinity of zirconia and optical microscopy shows the
fibers fabrication. Differnet percentage ( 2 ,4 ,8 , 10 and 12 ) of prepared zirconia
fibers mixed with ZnO powder.
All the specmen sintered at 1250 °C for 2hrs. Physical properties (density and
volume shrinkage) were measured and Mechanicl properties (Vicker ̉s
hardness,fracture strength and fracture toughness by indentation method ) were
calculated, 10% of fiber content has the maximum values for these properties for
the composite.