The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The springback is mainly an elastic deformation which occurs after sheet metal forming processes. This paper analyzed the mechanism of deep drawing springback of sheet metal forming, and the springback compensation was studied. Based on this, taking the stiffener parts of auto as an example, the paper analyzed the trend and distribution of springback and its distribution under different conditions...
In order to realize a less invasive robotic neurosurgery for the deeply seated tumor, a force detecting gripper with a flexible micro manipulator has been developed. Gripping force applied on the gripper is detected by strain gages fit on the gripper clip. Signal is conducted to the amplifier by the cables through the inner pipe of the manipulator. In order to approach to the deeply seated tumor through...
Snakes actively utilize irregularities in terrains and attain propulsion force by pushing their bodies against scaffolds. The objective of this study is to understand the mechanism underlying such functionalities of snakes on the basis of a synthetic approach. We construct a model of a serpentine robot with viscoelastic properties, and we design an autonomous decentralized control scheme that employs...
Tensairity structure system has not been applied in China yet. Based on the mechanical behavior of the Tensairity, a Tensairity structure model of 2.5m span is designed and manufactured. Under two concentrated forces loading on the mid-span of the model, the deflection and the laws of internal force distributing of the model are investigated, and the influence of the internal gas pressure on the static...
This paper presents the progressive failure simulation of truss structures using the Finite Particle Method (FPM). Three major difficulties in structural collapse simulation, namely the description of dynamic behaviors of structures, geometric and material nonlinearity and fracture, are considered in collapse process. Different from the traditional finite element method generated from continuum mechanics...
This paper presents the four-point bend test results for edge and corner bonded 0.5mm pitch lead-free package stackable very thin fine pitch ball grid arrays (PSvfBGAs) as package-on-package (PoP) bottom packages on a standard IPC/JEDEC bend test board. Four-point bend tests were carried out based on the above standard with a 30 mm loading span, 90 mm support span and 7.5 mm/sec crosshead speed. The...
Finite element analysis (FEA) simulation has been performed to evaluate the scaling of the nanoelectromechanical nonvolatile memory cell. FEA simulation predicted program/erase voltage and also hysteresis voltage more accurate than the analytical modeling in our previous work. It is because FEA simulation reflects the actual memory cell structure and includes nonlinear effects such as beam-stretching...
Corrosion of oil tubular goods is becoming more and more serious in the exploitation of oil and gas wells, so it is very significant to study new anti-corrosion materials of lined steel pipe. Aiming at the mechanical problem of lined steel pipe hydro-forming, a parametric finite element analysis (FEA) mechanical model is established in this paper to simulate the plastic forming process of lined steel...
Fine blanking process on plane blank holder utilizes three tooling elements: a punch, a plane blank holder and an ejector to generate a highly compressive stress state and pure shearing forces to constraint the deformation of sheet metal within the narrow blanking clearance zone. Numerical simulation of fine blanking for steel 20 was performed using commercial FEM software DEFORM, and element deletion...
Magnetically controlled shape memory alloys (MSMA) generate stress in a magnetic field, which can change the shape of the MSMA material. In order to guide the design, control and application of the MSMA actuators, modeling of the input dependence of the output for the actuators are necessary. Based on the thermodynamic model and the calculation method of magnetic field-induced stress, the model of...
Burrs formed on the work piece edges is a common phenomena in drilling. Burrs seriously affect the accuracy of measure and shape of the work piece. It is necessary to study the mechanism of burr formation in order to burrs controlling. A finilete element model is proposed in this paper, burr formation process is simulated and analyzed, including burr types, shear strain, strain rate and axial force...
In this paper, a micro/nano displacement sensor for PZT actuator which could measure the minute displacement in micron or nanometer level has been proposed. This paper focus on the whole process of this novel sensor from the working principle, parameter determination to the FEM simulation and so forth. This sensor can enlarge the displacement of the PZT by utilizing the lever principle and the strain...
In this paper, a nonlinear latency model is presented to describe the relationship between the strain and strain rate of the temporal responses in robotic grasping that involves viscoelastic contact interface. The results from experiments and simulation are presented, and are found to match well with each other. The nonlinear latency model was able to adequately represent both Type I and Type II relaxation...
The compliant parallel guiding mechanism is widely used in the micro-driving and precision measurement. In order to analyze the output displacement characteristics of compliant parallel guiding beam, a half beam model was established based on the force analysis and deformation analysis of the supporting arm according to the symmetrical structure. And the guiding displacement and coupled displacement...
Using FE method, the typical honeycomb core modulus is studied, the nonlinear stress-strain relationship with a property of “harden spring” under tensile load and “soften spring” under compress load is obtained. The effect of the height of the core on the analysis of the modulus is discussed, the results are compared with these acquired from Gibson formula. The polynomial fitting method is adopted...
The rapid assembly of printed circuit boards to meet the desired goal of thinning the board creates more complexity in the reflow process, to control the occurrence of warpage in the board. Therefore, certain methods are preferred for simply yet accurately predicting the amount of warpage inevitable in the reflow process. Responding to such a need, the study was carried out aiming to provide a specific...
During the building of cold-formed steel roof truss, vertical support was added on the lower chord of roof truss, which turn the statically determinate structure into statically indeterminate structure. The calculation results show that the inner force status of roof truss is changed because the tensile lower chords become beam-column members and some tensile members become compressive members, which...
The pellet mill is widely used in many fields such as seed processing industry, new energy technology, pharmacy industry and so on. As we know, the ring die and the press roller are vital to the pellet mill. Therefore, a mechanical model is set up to describe the force which acts on the internal surface of the ring die. Based on the model, FEA is put up with ANSYS to obtain the axial stresses, the...
The total theory of plasticity was employed in this paper to analyze the strain and stress of the cold hole-flanging on mid-thick metal sheet. An equation to calculate the lip thickness was introduced. Through comparing the results obtained from the presented equation with experimental values, it found that theoretical and experimental results were in strong agreement with each other.
In this paper, a transient dynamic finite-element analysis was carried out to investigate the effects of tool rake angle on cutting temperature, cutting force and chip-shear angle. The workpiece material is SiCp/Al composites, which are widely used in automotive industry, aircraft and aerospace constructions. The results show that cutting temperature and cutting force decrease, while the chip-shear...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.