Applied Mechanics and Materials Vols. 152-154

Abstract: This paper deals with the existing propulsion mechanism, analyzes the disadvantages of the flat key and the spline, studies the features of the profile curve of the inner gear with swing movable tooth. In an existing chain propulsion mechanism, we change the fit of the inner hole of sprocket gear and the outer circle of intermediate shaft to get the profile shaft connection of inner gear with swing movable tooth (a keyless joint), then introduce the propulsion mechanism with it. At last, applying Solidworks2010 software, we create the three-dimensional modeling of the propulsion mechanism, which would lay a solid foundation for the further study. This new propulsion mechanism has such advantages as self-centralizing, easy disassembly, low stress concentration, with a simple fit cross-section, transmitting big torque, suitable for the heavy loads of rock drilling.

Abstract: Dealing with the existing propulsion mechanism, the paper analyzes the deficiency of the flat key and the spline, studies the specialities of high-order elliptic profile. On the basis of chain propulsion mechanism, we get a high-order elliptic profile shaft connection. (a keyless joint) through changing the fit of the inner hole of sprocket gear and the outer circle of intermediate shaft, then introduce the propulsion mechanism with high-order elliptic profile shaft connection. At last, applying Solidworks2011 software, we create the three-dimensional modeling of the propulsion mechanism, thus laid a solid foundation for the further study. This new propulsion mechanism enjoys the superiorities like self-centralizing, easy disassembly, low stress concentration, with a simple fit cross-section, transmitting big torque, suitable for the heavy loads of rock drilling.

Abstract: This paper consists of research for actuality of propulsion mechanism, analysis of the disadvantage of flat key and spline, and analysis of features of the cosine tooth profile shaft connection. Based on existing chain propulsion mechanism, the propulsion mechanism with cosine tooth profile shaft connection is introduced, in which the cosine tooth profile shaft connection without key is composed of inner hole of sprocket gear and the outer circle of intermediate shaft with cosine tooth profile. The three-dimensional modeling is made by Solidworks2010 for the propulsion mechanism with cosine tooth profile shaft connection and provides fundamental base for the further research and application. This new propulsion mechanism has such advantages as self-centralizing, easy disassembly, low stress concentration, with a simple fit cross-section, transmitting big torque, suitable for the heavy loads of rock drilling

Abstract: This paper deals with the existing propulsion mechanism, analyzes the disadvantages of the flat key and the spline, studies the features of the generated isometric trilateral profile shaft connection. In an existing chain propulsion mechanism, we change the fit of the inner hole of sprocket gear and the outer circle of intermediate shaft to get a generated isometric trilateral profile shaft connection(a keyless joint), then introduce the propulsion mechanism with generated isometric trilateral profile shaft connection. At last, we create the three-dimensional modeling of the propulsion mechanism, which would lay a solid foundation for the further study. This new propulsion mechanism has such advantages as self-centralizing, easy disassembly, low stress concentration, with a simple fit cross-section, transmitting big torque, suitable for the heavy loads of rock drilling.

Abstract: This paper deals with the existing propulsion mechanism, analyzes the disadvantages of the flat key and the spline, studies the features of the eccentric wheel handspike roller movable inner gear profile curve shaped-connection. In an existing chain propulsion mechanism, we change the fit of the inner hole of sprocket gear and the outer circle of intermediate shaft to get a eccentric wheel handspike roller movable inner gear profile curve shaped-connection (a keyless joint), then introduce the propulsion mechanism with eccentric wheel handspike roller movable inner gear profile curve shaped-connection. At last, we create the three-dimensional modeling of the propulsion mechanism, which would lay a solid foundation for the further study. This new propulsion mechanism has such advantages as self-centralizing, easy disassembly, low stress concentration, with a simple fit cross-section, transmitting big torque, suitable for the heavy loads of rock drilling.

Abstract: By means of ANSYS Workbench, different materials, dimensions and shapes of the Chladni plates are simulated. The natural frequency and Modal are obtained so that the chladni plate is determined and manufactured, that is used in the experimental research. Then, modal analysis test is conducted by Experimental modal analysis, the resonance and modal characteristics of the plate between 1Hz to 1000Hz are identified. Finally, Modal reproduce experiment is conducted under the acoustic excitation. Experimental and analytical results show that the finite element analysis, experimental modal analysis and Modal reproduce experiment basically have the same results.

Abstract: In this paper, the rule of mixture, which is often used to derive the weld properties from the uniaxial tension test of a subsize welded specimen, was improved by taking the residual welding strain/stress into account and assuming iso-strain increment across the welded specimen. Based on this improved method, hardening data of two different tailor welded blanks were determined. Erichsen cupping tests were performed experimentally and numerically to evaluate the effects of welding residual strain and stress on TWB formability. The results indicate that: (1) the residual strain and stress affect the formality of TWBs to some extent and (2) neglecting the welding residual strain and stress may predict a delayed crack onset and relatively large values in the maximum punch load and Erichsen index.

Abstract: A novel type of hybrid cell composite structure has been developed, experimentally investigated and used for many practical applications. The cell system can fill relatively thick parts of cross sections of beams with lower risk of shear stress damage and cracks between uniaxial oriented fibres. Typical macroscopic sub-cells in the cross section structure are formed by the stamping process of partially cured and axially-oriented high modulus carbon fibre bundles (about 4-6 mm in the diameter), which are wrapped around by a thin layer of high strength fibres (oriented in ±45 or 89 degrees). An advantage of this final 3D cell composite structure is its higher static and fatigue strength and shear stiffness in comparison with thick unidirectional composite parts. Static, fatigue and residual static strength was experimentally investigated for 1D unidirectional as well as for 3D cell structure under four point bending loading on specimens with the rectangular cross section. The 3D structure shows much better static and fatigue properties as the thick 1D unidirectional structure.

Abstract: Using the nonlocal elasticity theory, this paper presents a static analysis of a microbeam according to the Timoshenko beam model. A fourth-order governing differential equation is derived and a general solution is suggested. For a cantilever beam at nanoscale subjected to uniform distributed loading, explicit expressions for deflection, rotation and strain energy are obtained. The nonlocal effect decreases the deflection and maximum stress distribution. With a double cantilever beam model, the strain energy release rate of a cracked beam is evaluated, and the results obtained show that the strain energy release rate is decreased (hence an increased apparent fracture toughness is measured) when the beam thickness is several times the material characteristic length. However, in the absence of a uniformly distributed loading, the nonlocal beam theory fails to account for the size-dependent properties for static analysis. Particularly, the nonlocal Euler-Bernoulli beam can be analytically obtained from the nonlocal Timoshenko beam if the apparent shear modulus is sufficiently large.

Abstract: The die manufacturing is very important for the automobile industry. For the die manufacturing process is very complicated the trial-and-error method is still used. In this paper the full flow of precise die face design process for automobile die is studied in detailed. First the primary drawing die face layout is explained. And the initial information for blank formability simulation and primary die surface design is summarized. For the precise die face design process the blank thinning rate and die deformation are studied according to the two simulation results combined. The industrial application shows that the full flow of precise die face design process for automobile die is a good way for decrease the die manufacturing cycle.