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Showing 3 results for Metal Plate
Experimental Study and Optimization of Dynamic Response of Polymer-Coated Metal Plates Subjected to Impact Loading Using Response Surface Methodology
T. Mirzababaie Mostofi, M. Sayah Badkhor,
Volume 20, Issue 4 (4-2020)
Abstract
One of the main aims of the current study is the experimental investigation and optimization of the dynamic response of polymer-coated aluminum plates under impulsive load. In the experimental study, the effect of several important parameters on the free forming of these structures under gas mixture detonation load, including the effect of aluminum plate thickness and polymeric coating, as well as the effect of applied load on the maximum permanent transverse deflection were investigated. In the optimization section, Design Expert Software was used to investigate the simultaneous effect of the mentioned parameters on the plastic deformation of the structure. In this software, the effect of independent parameters such as metal sheet thickness, polymer-coated thickness and loading impulse on the deflection of the two-layer structure has been investigated using the response surface method. Accordingly, the p-value for the model was less than 0.05, which means that the model is significant. The value of R2 is also equal to 0.9980. The results indicate that the presented model is suitable for these experimental data. The values obtained from the prediction of the model are consistent with the experimental results. Optimal conditions for the minimize deflection of the two-layer structure were also determined and tested experimentally. The result indicates that the prediction of the regression model and experimental data have a good agreement.
 

Free and Die Forming of Circular Metallic Plates Using Gas Mixture Detonation of O2 and C2H2: An Experimental Study
M. Ziya-Shamami, T. Mirzababaie Mostofi, M. Sayah Badkhor, H. Babaei,
Volume 20, Issue 10 (10-2020)
Abstract
In the last decade, the gas mixture detonation forming (GDF) method has been introduced as a novel and alternative method instead of other high-velocity forming (HVF) methods such as explosive method. Due to the lack of research in this field, the present study investigates the free and die forming of circular metallic plates under gas mixture detonation loading. In this series of experiments, steel plates with thicknesses of 1, 2, and 3mm, aluminum plates with a thickness of 3mm, and brass plates with a thickness of 1mm were used. Furthermore, the test specimens were loaded in the impulse range of 4.12 to 54.68N·s. For better comparison, the same areal density condition was considered to compare the results of steel, aluminum, and brass plates under the same loading conditions. Experimental results showed that using a die with an apex angle of 60° leads to the decrease of the maximum permanent deflection by 14.8, 20.2, and 21.4% in 1, 2, and 3mm steel plates, respectively. Under the same loading and areal density conditions, for free forming, the use of aluminum and brass plates lead to increasing the maximum permanent deflection by 19.4 and 13.1% compared to the steel sample, respectively. However, in die forming, these values were 5 and 2%, respectively. Also, the comparison of the results for aluminum and brass plates shows that the using die forming reduces the maximum permanent deflection of the specimen by 12.1 and 10.6%.

Study of Sacred Animals’ Bas-relief in Sassanid Metal Works Art in Mazandaran

Volume 24, Issue 3 (9-2017)
Abstract
The Sassanid era is one of the most brilliant in the Iranian civilization in terms of various arts development. The coastal areas of the Caspian Sea, especially Mazandaran, has long been the site of artistic manifestation with countless examples of art works kept in different museums inside and outside the country. The Sassanid art particularly depict life and glory of the kings. With a deep insight into the works, one can easily find the use of a vast array of birds, animals, plants, gods and mythological beings in symbolic ways. After reviewing and researching all the works created in the Sassanid period, a common feature attracts opinions, and that is the similarity and harmony of decorative motifs in all of these works, especially bas-reliefs, metal wares, fabrics and seals. The purpose of this research is to investigate the images of sacred animals on the Mazandaran artifacts of the Sassanid period, in response to the question of what is the relationship between the designs of sacred animals and the motifs on discovered metal works of Mazandaran. The results of this study clearly show that in most of the concepts and representations in the works produced in every part of this civilization, a common goal was pursued, and it is a struggle against evil forces. The symbolic emblems of sacred animals in Iran can be found in close connection with the beliefs and religions of that era, some of which are manifested in the form of boar and lion in the body of gods and goddesses.
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