Sina Gohari Rad

• PhD
• Head of Department at Islamic Azad University, Lashtenesha-Zibakenar Branch, Lashtenesha.Iran

Currently, available conventional scaling methodologies are suffering from many deficiencies, which the most important ones can be listed as: (i) the inability to systematically capture the different material properties of full- and small-scale models, (ii) the inability to simultaneously fix two parameters having the same unit, and (iii) a limited...

The present paper aims to introduce a new finite element approach in numerical modeling of the impact tube hydroforming process. For this purpose, the coupled Eulerian-Lagrangian method is used to replicate the formation of the water flow, resulting from an impact, leading to the fabrication of flawless T-shaped copper tubes. One major advantage of...

Hydroforming is used for generating hollow monolithic products in order to decrease the number of joints. It can also reduce weight, thus enhancing the quality of fluid transfer parts in the hydraulic system. In this method, the parts are created into the shape of a mold via fluid pressure. In this process, adopting a loading path is an important i...

Purpose The process of hydroforming is defined as the formation of parts into the internal mold design using internal pressure. This process can extensively reduce parts and secondary operations, and adoption to the loading path is one of its most essential points. The purpose of this paper is to address these issues. Design/methodology/approach A...

This study investigates the crashworthiness behavior of thin-walled mild steel cylindrical tubes against hybrid tubes made of mild steel and high density polyethylene (HDPE) exposed to high-rate dynamic loadings. To carry out this investigation, three types of tubes are used. First type samples are thin-walled tubes made of mild steel; second types...

Grooved tubes benefit from optimized energy absorption characteristics compared to regular tubes. This paper investigated the crashworthiness characteristics of cylindrical tubes with various types of grooves under high-speed impact loads. Furthermore, the dynamic load response of tubes with external grooves having linear thickness distribution was...

This paper aims to investigate the dynamic plastic behavior of single and nested circular rings traditionally used as energy absorbers. The response characteristics of these structures are experimentally and numerically determined when they are subjected to high rate lateral impacts. It should be emphasized that a gas gun is employed in order to co...

The purpose of this study is to produce a ductile damage model for 7075-T6 aluminum alloy by correlating the effect of stress - state parameters to the pre-mechanical working exited by an impulsive shock loading. A stress state-based ductile damage model is coupled implicitly with constitutive plasticity framework to anticipate a generalized true f...

the effects of friction stir pre-mechanical processing on damage evolution of 7075-T6 aluminum alloy has been investigated by implementation of stress state dependent damage model which is described in a phenomenological way. In this regards, a series of specimens with specific geometry were designed from sheet with and without friction stir pre- m...

In this paper, the evolution of a ductile damage in the 7075-T6 aluminum alloy is considered based on stress state parameters with a special focus on pre-mechanical working dependency. Uniaxial stress-strain curves are investigated experimentally for two conditions; specimens with shock loaded pre-mechanical working and without it. This kind of loa...

An approximate analytic solution of a temperature distribution equation in a uniformly thick rectangular fin radiation to free space with nonlinearity of high order is formally obtained using the homotopy analysis method. It is shown that the freedom of choice of the auxiliary parameter k gives way to adjust and control the convergence of the solut...