فهرست مطالب مصطفی رجایی

Explanation Jihad is one of the very important agendas to deal with any deviation and distortion in the discourse and values of the Islamic Revolution, which the Supreme Leader of the Islamic Revolution has emphasized many times and at various times. This research was done with the aim of analyzing Jihad of explanation and its jurisprudential and legal foundations, and this can be achieved by the method of describing and analyzing the analytical propositions of Jihad of explanation and jurisprudential and legal foundations by collecting library data. Due to the fact that no integrated research has been done in this regard, the question of explanation jihad and its jurisprudential and legal foundations is an issue that needs to be searched until a desired result is reached. Through the study, we came to the conclusion that Jihad of explanation is a cultural Jihad, that is, issues that need to be explained should be introduced to the people and society, and rules based on jurisprudence and law, including guidance of the ignorant, national unity, and observance of morals, etc. be executed

Aluminum alloys have good anti-corrosion properties and strength to weight ratio. In this paper, a statistical method based on finite element simulation was used to obtain the highest percentage of mold filling and the minimum percentage of thinning in the forming area. First, the finite element model is prepared and the accuracy is compared with the results of the experimental part. Effective factors including, temperature, pressure, pressure rate, axial feed and punch speed were evaluated by the response surface method in order to extract the model and find the maximum effect. Design Expert software was used to model the response surface methodology and Abacus finite element software was used to simulate it. According to the obtained results, the optimal points obtained for both characteristics are: temperature 552°C, pressure 6.5 bar, bar rate 0.02 bar/s, axial feed 7 mm and feed rate 0.05 mm /s with filling percentage 91.2 and a thinning percentage of 10.37 were obtained. The proposed model for predicting the values of variables had very close results with the experimental findings.

In this paper, the effect of geometric parameters of tube and die on the forming behavior of AA6061 step tube in hot metal gas forming process (HMGF) is investigated. For this purpose, empirical experiments and finite element simulations with ABAQUS software have been used. Investigations have been made at the different ratios of die to tube diameter (D/d) and the different ratios of tube thickness to diameter (t/d). A simple theoretical model for the relationship between these geometric parameters and the process parameters such as internal pressure and axial feeding is presented. The results show that under constant internal pressure and axial feeding conditions, the die filling percentage decreases with increasing the ratios of D/d and t/d. Also, in the constant D/d ratio, by increasing the t/d ratio to about 0.05, the die filling percentage reduces gradually, but with increasing t/d to 0.06, a sharp decrease occurs in the die filling percentage. Using different simulations, the internal pressure, and axial feeding are changed proportional to the t/d and D/d ratios. The results show that in accordance with the prediction of the theoretical model, the relative internal pressure and relative axial feeding should be increased linearly with increasing the t/d and expansion ratio , respectively, to give specimens with approximately the same die filling percentage.