Papers by Keyword: Maximum Stress

Abstract: Developing prototype aluminum pontoon lifting that functions as a floating dock for the repair of small vessels. To ensure the safety aspects of the construction of the Poonton lift, structural analysis is carried out. The purpose of research to determine the strength and fatigue life construction of lifting ponton due to loads. The method used is the finite element method and the palmgren-miner method. This research uses finite element based software. The results showed that the maximum stress value in the construction of the lifting pontoon is (σ_max) = 74,897 MPa which is located in the H-Beam construction that functions as a supporting. The estimated fatigue life of the poonton lifting analyzed during operation is 9.46 years with a total load cycle of 1111680 cycles.

Abstract: In the current automated high-tech world the applications and use of robot has become the vital role in all areas in industries and in common social applications. The mechanical design process essentials to improve and also it is a way to capable of giving consistent and fast efficient products. One way of altering the process is through reducing the manual work by systematizing the repetitive tasks using static analysis ways in the computer software. With a view to meet the purpose of inspecting the outer surface weldments in steel storage canister used to store the High-level fuel waste at nuclear industry with the help of Non-destructive testing (NDT) equipment. In this research work the new mechanical configuration of the robot arm was designed, and this arm was utilized to carry the vision camera at the end effector to capture the weld surfaces. This paper focuses the mechanical modeling of the manipulator mechanism and finite element (FE) method and analysis of the designed arm with different positions and specific load condition. From this study the statically balanced design of the robot was determined with three different positional conditions. The largest value of displacement and stress produced in the arm also discussed with clear FEA simulation results. In this paper mechanism of seven degrees of freedom robot arm is discussed.

Abstract: In the present work, we study how to improve mechanical properties of carbon fiber reinforced plastics (CFRP) in order to increase crashworthiness probability. Experimentally, hybrid carbon /glass fiber composite was made in order to get higher mechanical properties. As a results, with increasing carbon fiber volume fraction (% vol.), tensile strength and flexural strength of the composite are increased. Simulation of impact testing is also performed using data properties taken from the experiment with variation of impact forces on front bumper structure. By varying external load to the bumper, the result shows that higher thickness of hybrid carbon/glass fiber composite has always smaller stress values than thinner one. On the other hand, the displacement of hybrid carbon/glass car bumper increases linearly with increasing external load.

Abstract: Auxetic materials are those that exhibit negative Poissons ratio. In spite of their rarity, auxetic materials have been artificially produced and also found to exist are known to exist naturally. Arising from their anomalous behavior, research on auxetic materials has been carried out for possible applications in fields as diverse as biomechanics and aero-structures. This paper investigates the effect of auxeticity on the maximum stress in thin and thick rotating disks. The obtained results show that maximum stresses are lower in rotating thin disks that are made from negative Poissons ratio materials. It is also revealed that the maximum stresses in thick rotating disks can be reasonably approximated by rotating thin disk theory if the thick disk material possesses negative Poissons ratio.

Abstract: The loading roller number and maximum stress of the bearings can not be calculated accurately through conventional methods because support manner of the roller bearings used in rolling mill is different from that of the roller bearings used in conventional condition. Based on characteristic of the bearings, the model of the bearing is made combining contact mechanics with finite element method. The loading roller number and maximum stress of the bearings are calculated through FEA. The work of this paper offers a reference to design and manufacture this kind of bearings.

Abstract: In this paper, some factors effect on the maximum stress of inner rubber of some elastomer isolators with big diameter of 1500mm are analyzed by FEA. These factors include size of hole, ratio of , shear modulus of inner rubber , the first shape factor , thickness of cover rubber. The isolators include those used in building or bridge, loading condition is single compress . Research results show that size of hole, ratio of and have a little effect on the maximum stress of inner rubber, but shear modulus of inner rubber, and thickness of cover rubber hardly effect.

Abstract: To increase the stroke of precision positioning system, a novel series compliant mechanism is presented which is based on elliptical flexure hinges. Pseudo-rigid-body model and energy method are applied to establish the theoretical model of stiffness and maximum stress, which are critical parameters for the large stroke compliant mechanism. The relationships are analyzed between geometric parameters of the series complaint mechanism, stiffness and maximum stress. According that, the series compliant mechanism is designed with the stroke more than 5mm and stiffness less than 3.2N/mm. The difference is less than 5% between the results of finite element analysis and theoretical model computation, which proves the correctness of the application design.

Abstract: Portable bridges are very important for maintaining mobility in the aftermath of natural disaster or in the battlefield. This requirement has lead to the needs for light-weight bridging system for ease in launching, retracting, transporting, and storing. In this research, a foldable bridge with three sections of beam connected together using the hinges connection has been designed and analyzed. The bridge is constructed using sandwich Carbon Fiber Reinforced Polymer (CFRP) which consists of CFRP and Aluminum Honeycomb, as the skin and core, respectively. The uses of materials are expected will reduce the total weight of bridge without decreasing of overall performance. Failure theories of composite material such as Maximum Stress, Maximum Strain, Tsai-Wu and Tsai-Hill failure theories were selected to generate an allowable strength graph. From the graph, can be seen that, the material stresses are in the allowable stress-strain ranges, therefore, the bridge is capable of carrying the design load with sufficient safety factor.

Abstract: According to contact mechanics, the contact regions between the rollers and the steel plate, and then the boundary conditions and FEA model of the roller system of rolling mill are determined reasonably considering the characteristic of the structure and loads. The simulations of the system under different values of loads have been done using FEA and main results are introduced in the paper. The work of this paper offers a reference to calculate the strength or work life of parts in the system and a basis to analyze the roller bearings in the system with 3D FEA in detail.

Abstract: This article carries on the test to materials of the roadbed and the pavement in the room, and obtains mechanics computation parameter; Considered the road overload situation, we carries on the modeling computation to the typical semi-rigid bituminous pavement structure through using the finite element software; Carrying on the analysis, we obtains the correlation formula between the road deflection and various structures level maximum stress .it can provide the theory basis and the instruction experience for the highway pavement structure design, the examination and the construction control.