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Showing 2 results for Hajimohamadi
Volume 19, Issue 1 (January 2019)
Abstract
In the different applications of thin plats in engineering industrial, some holes are created in the structure that can have different shapes such as circular, elliptical, and quasi-square. When the plate is subjected to loading, stress concentration around the hole causes the crack initiation in these areas that can results in a catastrophic failure. In this paper, mode II stress intensity factor (SIF) for two unequal aligned cracks emanating from a circle or a quasi-square hole in an infinite plane was investigated. The complex variable theory of Muskhelishvili and conformal mapping method were used. To obtain mapping function, Schwarts Christoffel integral was combined with some simple mapping functions. Accordingly, a new mapping function is presented and approximated to the sum of series expansion. Using this approximate mapping, SIF is calculated with high accuracy. Surfaces of the cracks and hole are traction-free. The plane is subjected to the pure shear at infinity. The analytical results are in good agreement with the literature. The obtained stress intensity factors have good accuracy for small cracks. The equation presented in this paper is applicable to the length of the different cracks and calculates the intensity coefficients of mode II for very small cracks with high accuracy. Results show that the shape of the hole is important only for the small cracks.
Ali Binandeh, Behruz Khanmohamadi, Kumars Hajimohamadi,
Volume 24, Issue 3 (9-2017)
Abstract
Bari Castle is located on the western side of Urmia Lake. The castle enclosed with stony walls measuring several meters high, encompasses a widespread area. It was used in the first millennium BC considering the castle’s architectural features and potsherd remains found on its surface. For almost 150 years, from the middle of the 9th century to the end of the 8th century, the Urartian areas in Iran did not witness any attack from Assyrians. It was only during the reign of Sargon II, clashes erupted between Urartu and Assyria. The reason was that Urartu interfered more and more in the affairs of the kingdom of Mannea, which Assyria considered a tributary. The first half of the 7th century is when Mannaean seized the power in that area. It was the time which saw the expansion of Mannean more than ever, especially its dominance on the Urmia plain, hence; the Bari castle was of the Mannaean Empire.
