Search published articles


Showing 4 results for Karami Moghadam
Effects of olive oil on physial, mechanical and moisture barrier properties of caseinate – based edible film

Volume 12, Issue 49 (10-2015)
Abstract
This study investigates the effect of olive oil on the caseinate‐based films. Edible films based on caseinate (5% (w/v)) and glycerol (30% (w/w)) by varying olive oil concentrations (0, 10, 20 and 30% (w/w), were prepared by casting method films. The impact of the incorporation of olive oil into the film matrix was studied by investigating the physical and mechanical properties of films. Scanning electron microscopy (SEM) was also used in order to analyse films microstructure. Increasing the olive oil concentrationup to30%(w/w) decreased values for thickness and solubility from 0.050mm and 92.18% to 0.042mm and 61.84% respectively and caused the films to become opaque. Also addition of olive oil to caseinate emulsion significantly improved the WVP (upto9×10-10g/s.m.pa)of prepared films, but lowered the mechanical properties. The results indicate that the structure and properties of caseinate edible films were modified and improved by the olive oil.
The effects of laser pulse energy and focal point position on laser surface hardening of AISI 410 stainless steel
Mahmoud Moradi, Mojtaba Karami Moghadam, Jalal Zarei, Behnam Ganji,
Volume 17, Issue 6 (8-2017)
Abstract
In this paper the capability of laser surface hardening of martensitic stainless steel AISI 410 is conducted by using a Nd:YAG pulsed laser with a maximum power of 700 W. Focal point position (22mm to 34mm) and laser pulse energy (14.7J to 16.8J) were considered as process variable parameters. microhardness was measured in depth and surface of hardened layer. Metallography of samples was conducted in order to study the microstructure of hardened zone. Also geometrical dimensions of hardened zone (width and depth), microhandness distributions in depth and width of hardened layer, microstructure of hardened layer were investigated. Results show that by increasing laser pulse energy and decreasing the laser focal point position, the hardness and depth of hardened layer increases. Observations indicated that solid state transformation and carbide solution in steel during laser surface hardening process, improved the surface hardness. Lower delta ferrite in martensitic structure in laser hardened layer lead to higher microhardness. Maximum hardened layer of 350 µm in depth and 2208 µm in width and maximum surface hardness of 747 HV0.3 is obtained in maximum pulse energy of 16.8J.
4D Printing Additive Manufacturing Review; Mechanisim, Chalanges, Applications and Future
M. Moradi, M. Karami Moghadam, F. Asgari,
Volume 20, Issue 4 (April 2020)
Abstract
Additive manufacturing in the modern world is progressing significantly, resulting in special applications in engineering sciences, medicine, and art. When the MIT university mixed the concept of time in the 3D printing process, time was considered as the fourth dimension. By combining the fourth dimension, the time, the smart materials made of additive manufacturing are able to a reaction to the external motivations (heat, voice, impact, etc) within a specified time. In the 4D printing process, the material configuration will be converted to a converter that will be exposed to external motivation such as heat, water, chemicals, electrical current and magnetic energy. It is expected that in the future, this technology will be widely used, requiring the application of various engineering disciplines, including mechanical engineering, in the fabrication and production of objects, because the overall perspective of the 4-D printing process is to make intelligent materials that are optimized using computational challenges and empirical knowledge. In this article, after reviewing the 3D printing and introducing smart materials, the issue of 4D printing has been investigated using this material. The mechanism, challenges, applications, and future of 4D printing has been discussed.

Experimental Investigation of Laser Cutting Post Process of Additive Manufactured Parts of Poly Lactic Acid (PLA) by 3D Printers Using FDM Method
M. Moradi, H. Falavandi, M. Karami Moghadam, M. Shaikh Mohammad Meiabadi,
Volume 20, Issue 4 (April 2020)
Abstract

3D printing technology is used in a variety of industries without auxiliary tools because it is flexible in producing and reduces the waste of material. In this paper, the laser cutting process of polylactic acid sheets has been investigated by a 3D printer. The fused deposition modeling (FDM) method was used for printing the sheets. Production of sheets with a thickness of 2.3 mm by optimal conditions was conducted (each layer was perfectly solid with a thickness of 0.27 mm, and the extruder temperature of 226.62 °C). The laser used in this paper is a CO2 low-power, continuous-wave laser. Laser input parameters including laser cutting speed, focal point position, and laser power were selected as the variables. By performing several experiments, the effective range of each parameter was evaluated. The upper and lower cut width, the angle of cone and the upper cut width ratio to the lower cut width of the process output parameters were selected. The optical microscope was used to examine the geometric characteristics of cutting kerf of the samples and then the images were measured using ImageJ software. The purpose of this paper is the laser cutting process to achieve cutting kerfs with good quality and proper setting of laser input parameters.


Page 1 from 1