Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
Volume:15 Issue: 3, Sep 2023

Airliner’s parts are very critical and should be manufactured properly without any defects, because every fault may lead to irreparable happening. Therefore, the manufacturing of the parts of airliners is very significant.  One of the production methods for manufacturing these parts is die press metal forming (stamping). This process which is a kind of sheet metal forming process, in recent years has become one of the most widely used methods in the field of manufacturing industrial parts with complex geometry. Therefore, studying the effective factors in the proper execution of the process helps to achieve high-quality products and optimal geometry. To analyze the behavior of materials during the die press forming process, the FEM simulation procedure should be applied. In this study, manufacturing (stamping) of a part related to the tail of the 8-person capacity airliner, is investigated through FEM simulation. The FEM simulation is performed via ABAQUS software. Due to the importance of the weight of airliners, their parts are usually made of aluminum alloys. In this project, Al6061 is designated for the mentioned part. The results of the simulation show that the designed dies are suitable and the forming process is completely performed.

The recycling of mine stone waste has been interesting for the creation of employment opportunities and added value and the prevention of environmental pollution. The present study examined the effects of the physicomechanical properties on the abrasion resistance of artificial stones produced with granite cut waste. A total of four artificial specimens were produced under different compositions and methods. Their physicomechanical properties, such as density, porosity, water absorption, hardness, compressive strength, and abrasion resistance, were evaluated. Finally, the artificial stones were compared to natural granite and marble in abrasion resistance. It was found that an increase in the porosity and water absorption reduced hardness, compressive strength, and abrasion resistance. Furthermore, hardness, compressive strength, and abrasion resistance declined as the porosity and water absorption increased. The increased rotational speed and load in the Taber abrasion test diminished abrasion resistance. The epoxy resin-based artificial stone exhibited the highest performance among the artificial specimens. It had almost the same porosity and water absorption as natural granite and marble. However, the epoxy resin-based stone with lower Mohs hardness and compressive strength showed less abrasion resistance compared to the natural granite and marble. As a result, all four artificial stones showed satisfactory performance for the flooring of congested areas.

Nowadays, the use of bimetallic laminates with special capabilities and features is increasing and has experienced high growth. These properties include high mechanical properties, corrosion resistance, light weight, resistance to noted good abrasion and thermal stability. In the midst of the technologies of multilayer composite materials Accumulative Press Bonding (APB) is one of the most common techniques for the production of multilayer composites. One of the most important aims for this choice is the press pressure, which can create a strong and suitable mechanical connection between Produced metal layer components. In this study, the Accumulative Press Bonding method has been used to produce aluminum and copper composites and the process modeling has been done by ABAQUS finite element analysis software. In this paper, the effect of Press parameters such as strain and number of layers on the distribution stress of forming this type of composites has been investigated. Shear stress among the layers reached to about 4MPa for samples with eight layers which is a good condition to generation a successful bonding.  With increasing thickness, the stress applied on the layers has also increased. Maximum stress also increases significantly. As the thickness decreases, the interlayer shear stresses also increase. With increasing percentage of thickness decrease, the amount of sinking of the layers in each other has greater than before, which has led to the crushing of copper layers along the entire length of the sample. During the process, as the number of passes increases, the volume of virgin material in the direction of the press rises, which leads to increased compaction and better adhesion of the layers to each other.

Carbon nanomaterials, such as carbon nanotubes (CNTs) and graphene, possess remarkable mechanical, electrical, and biological properties, making them promising enhancers in biological materials. Their nanoscale dimensions and large surface area enable targeted interactions with living organisms. However, concerns regarding their cellular compatibility in clinical orthopedic applications persist. To address this, ongoing investigations are examining the interaction of carbon nanomaterials with biological systems, including proteins, nucleic acids, and human cells, to assess their behavior in laboratory and in vivo settings. Studies have demonstrated that composites reinforced with CNTs and graphene enhance the adhesion of osteoblast cells, leading to enhanced bone tissue formation. This potential is expected to drive advancements in reconstructive medicine and bone tissue engineering. Additionally, this article presents current advancements and future research directions in developing CNT and graphene-reinforced implants for bone tissue engineering.

In the beginning, to use robots, a person must be next to them to be able to use them. Therefore, it is necessary to design a robot that can be operated without a person physically present. This article is about the operation of a robot that is not near us and can be launched from a control station. This is possible through a technique called image processing. In order to simplify an acceptable solution for a user-friendly interface, commands can be applied to a wireless robot using hand gestures. Will be the motion detection system includes three stages of image capture, feature extraction, and algorithm decision making. When the gesture is detected, a command signal is generated and sent to the micro-controllers. These command signals are then sent to the robot to make it run in a certain direction. One of the applications of the robot is to select and replace cases where human intervention is not possible. The pick and place arm is a microcontroller-based mechatronic system that selects the object from the source location and places it in a desired location, this operation is controlled using a keyboard. In addition, the robot records video signals with its RF camera at 2.4GHz (installed on the robot). The live video of the robot is received at the base station (computer). It is tested in the MAT software and the video is simultaneously processed in the DSP code.

This in vitro experimental study compared the average surface roughness (Ra value) of Z250 microhybrid and Z350 nanohybrid composite resins following polishing with the EVE simplified polishing system versus the multi-step Sof-Lex discs. Ninety-six composite discs (8 x 2 mm) were randomly divided into four subgroups: control (surface under the Mylar strip, no finishing/polishing), polishing with Sof-Lex discs, polishing with EVE discs, and polishing with EVE discs + EVE polishing paste. Prior to polishing, the specimens were ground with 1200-grit silicon carbide abrasive paper. The average surface roughness of each specimen was measured before (baseline) and after polishing using a profilometer. The results were analyzed using ANOVA and Bonferroni tests. The control subgroups showed the smoothest surfaces. A significant difference in surface roughness was found in the Z350 subgroups, with the Sof-Lex system yielding the roughest surface (P<0.05). The EVE discs + EVE paste system yielded the smoothest surface after the control subgroup. The difference in surface roughness was also significant among the Z250 subgroups, with the Sof-Lex system creating significantly rougher surfaces than the EVE discs + paste system. A significant difference in surface roughness was observed in all eight subgroups, with Z350 specimens polished with Sof-Lex discs and Z350 control specimens showing the maximum and minimum roughness, respectively. The study concludes that the two-step EVE polishing system may be preferred over the multi-step Sof-Lex discs for polishing Z250 and Z350 composites, as it provided significantly smoother surfaces.