List of Solid Mechanics subject articles

Open Access Article

1 - Torsion of cylindrically poroelasic circular shaft with radial inhomogeneity .some exact solutions for extruder
mohammad farid khansanami Faranak Khansanami

Torsion of elastic and poroelastic circular shaft of radially inhomogeneous, cylindrically orthotropic materials is studied with emphasis on the end eﬀects example for extruder. To examine the conjecture of Saint-Venant’s torsion, we consider torsion of circular s More

Torsion of elastic and poroelastic circular shaft of radially inhomogeneous, cylindrically orthotropic materials is studied with emphasis on the end eﬀects example for extruder. To examine the conjecture of Saint-Venant’s torsion, we consider torsion of circular shaft with one end ﬁxed and the other end free on which tractions that results in a pure torque are prescribed arbitrarily over the free end surface. Exact solutions that satisfy the prescribed boundary conditions point by point over the entire boundary surfaces are derived in a uniﬁed manner for cylindrically orthotropic shafts with or without radial inhomogeneity and for their coun- terparts of Saint-Venant’s torsion. Stress diﬀusion due to the end eﬀect is examined in the light of the exact solutions.The present study enables us to assess Saint-Venant’s principle as applied to anisotropic, non-homogeneous poroelastic bodies in general and to evaluate the stress diﬀusion in torsion of radially inhomogeneous, cylindrically orthotropic cylinders in particular. The following conclusions can be drawn from the analysis. Manuscript profile

Open Access Article

2 - The methods of sever plastic’s deformation in order to fine-graining matter’s structure for improvement of mechanical properties in metals
سید حسن سجادی بهروز مهدی خوانی علی پیروی

Increasing material’s strength has been a significant matter since the beginning of engineering to up to now. It has always been paid attention by engineers. A variety of methods has been presented for increasing strength, stability, working range and material wor More

Increasing material’s strength has been a significant matter since the beginning of engineering to up to now. It has always been paid attention by engineers. A variety of methods has been presented for increasing strength, stability, working range and material working life by development of engineering sciences and more identification on material properties and the material behavior, which are surrounded by some rules. Majority of these methods accompany disadvantages and restrictions, therefore, the studies in this field for modification of methods continue. One of the newest methods for this reason is the Sever Plastics Deformation Method (SPD). This method is based on creation of NANO materials increases some desirable properties such as strength, stability, resistance against corrosion and abrasion properties. Also, it prevents the reduction of other material properties like ductility, which is known an inevitable and undesirable process in majority of older strength’s methods and even is caused to increase it. Increasing of desired properties of metals, which were under this process, is very significant, so that the products of this process are named Super Metals. In this research, mean while checking relations among the automatic lattice structure of matter with its mechanical properties somehow it has been mentioned to common method of SPD Manuscript profile

Open Access Article

3 - Improving Mechanical Properties, Especially Increasing Tubes’ Strength by Micro structuring Metals Using Severe Plastic Deformation Method
سید حسن سجادی حسین پوراکبری سیامک صادقی امید میرجابری

Increasing material’s strength is of particular importance. Improving material’s mechanical properties such as strength could reduce the size and weight of the structure. The size and weight of the structure are among the effective parameters in design. Sinc More

Increasing material’s strength is of particular importance. Improving material’s mechanical properties such as strength could reduce the size and weight of the structure. The size and weight of the structure are among the effective parameters in design. Since the past a variety of methods have been developed to increase the strength of metals that are capable of increasing metals’ strength to a certain level. But most of these methods while increasing strength are associated with relatively high material formability properties. This is one of the most important limitations of the methods. Plastic deformation method is among the new methods that in addition to increasing the material’s strength will strengthen other desired mechanical properties of the material by micro structuring the crystal lattice of a metal. The mechanical properties of the products of this process are so better than the original metal properties that they are known as super metals. Various methods have been developed to make the materials in tubes NANO structured. Products produced during these processes despite being thinner are less capable to withstand pressure and have higher corrosion and wear resistance compared to the tube manufactured by the conventional methods. Moreover they have the potential to be used at higher temperatures and have longer lifetime. These advantages have increased the importance of plastic deformation methods for the tubs. In this research while a brief discussion on the effect of severe plastic deformation on the material structure the conventional methods for manufacturing the tube are reviewed. Manuscript profile

Open Access Article

4 - A FSDT model for vibration analysis of Nano rectangular FG plate based on Modified Couple Stress Theory under moving load
یونس امین

In present paper, vibration of Nano FGM plate based on modified couple stress and First Order Shear Deformation Theories (FSDT) under moving load has been developed. Basic equations and linear strains are introduced by first order shear deformation theory and Mori Tanak More

In present paper, vibration of Nano FGM plate based on modified couple stress and First Order Shear Deformation Theories (FSDT) under moving load has been developed. Basic equations and linear strains are introduced by first order shear deformation theory and Mori Tanaka’s model is used for the plate. The module of elasticity and density are assumed to vary only through thickness of plate. Governing Equations are derived according to the modified couple stress theory and Hamilton’s principle. Constitutive equations are also derived based on modified couple stress and finally, analytical solution for simply supported Nano rectangular FG plate is obtained by using of Navier solution. Examples of length scales parameter and power law index are presented to show effect of this parameter on plate behaviors. Results show that plate’s deflection enhances with power law index increasing and by increasing of length scale parameter, deflection decreases, and for frequencies, the deflection with both raising of power law index and length parameter scales, are reduced Manuscript profile

List of articles (by subject) Solid Mechanics