Abstract:The squaring tube process is examined by an incremental elasto-plastic finite-element method based on an updated Lagrangian formulation in which a sliding-sticking friction mode is specifically considered. The high nonlinearity of the process due to the geometric changes, the inelastic constitutive behavior, and the deformation-dependent boundary conditions are taken into account in an incremental manner. A static explicit approach to the solution is applied, the tangent stiffness matrix equation is solved wit… Show more
“…The maximum value of error was up to 6% that is acceptable for simulation in metal forming processes. 3–6 Figure 8.Thickness distributions of drawn tubes. (a) Specified path.…”
Section: Finite Element Simulationmentioning
confidence: 99%
“…They found that the most critical location that thinning occurs is in a location between free-support tube wall and a section in contact with the die. Leu and Wu 6 used number of V-shape dies and moved a circular tube across their channel to produce squared section. They used elasto-plastic finite element analysis under plane-strain condition.…”
In present study, an attempt based on a hybrid approach was made to find optimal tube drawing parameters combination (i.e., die semi-angle, friction coefficient, tube entrance velocity, deformation length, and primary tube diameter) achieving minimum forming force, minimum dimensional error along with maximum thickness in longitudinal and circumferential directions. In order to form a design matrix, Taguchi L27 design was used and required data were derived from finite element model of the process. Adaptive neuro-fuzzy inference system (ANFIS) was then used to correlate process inputs to and responses aforementioned response outputs. Prediction accuracy of created ANFIS models was further checked by FE simulation and experimental testing data. Finally, the models were integrated to form objective function that was optimized by teaching-learning-based optimization (TLBO) algorithm. To check the adequacy of optimization, a finite element run and an experiment were carried out by obtained optimal parameter setting and the results were compared. The findings indicated that that the proposed methodology, that is, FEA-ANFIS-TLBO has superiority in identifying the optimal results.
“…The maximum value of error was up to 6% that is acceptable for simulation in metal forming processes. 3–6 Figure 8.Thickness distributions of drawn tubes. (a) Specified path.…”
Section: Finite Element Simulationmentioning
confidence: 99%
“…They found that the most critical location that thinning occurs is in a location between free-support tube wall and a section in contact with the die. Leu and Wu 6 used number of V-shape dies and moved a circular tube across their channel to produce squared section. They used elasto-plastic finite element analysis under plane-strain condition.…”
In present study, an attempt based on a hybrid approach was made to find optimal tube drawing parameters combination (i.e., die semi-angle, friction coefficient, tube entrance velocity, deformation length, and primary tube diameter) achieving minimum forming force, minimum dimensional error along with maximum thickness in longitudinal and circumferential directions. In order to form a design matrix, Taguchi L27 design was used and required data were derived from finite element model of the process. Adaptive neuro-fuzzy inference system (ANFIS) was then used to correlate process inputs to and responses aforementioned response outputs. Prediction accuracy of created ANFIS models was further checked by FE simulation and experimental testing data. Finally, the models were integrated to form objective function that was optimized by teaching-learning-based optimization (TLBO) algorithm. To check the adequacy of optimization, a finite element run and an experiment were carried out by obtained optimal parameter setting and the results were compared. The findings indicated that that the proposed methodology, that is, FEA-ANFIS-TLBO has superiority in identifying the optimal results.
“…Rectangular steel tubes are widely used as structural elements in numerous applications. The advantages of rectangular pipes over circular tubing include the fact that they are easy-to-fit regarding the direction, produce a high torque when twisting, and reduce the weight of structured parts [ 1 ]. Rectangular pipes are usually produced from a welded round tube using a cold drawing trough and a head, which is comprised of idle rolls [ 2 , 3 ].…”
When bending thin-walled profiles, significant distortion of the cross-section occurs, which has a significant impact on the course of the bending moment characteristics and on the value of allowable bending curvatures. This paper presents the results of experimental and numerical modeling of the box profile bending process, which was carried out in order to determine the dependence of the cross-sectional shape and bending moment of bending curvature. Extensive numerical calculations were used to model the process of shaping a square pipe from a circular tube and to model the bending process, especially when taking into account the effects of such a deformation path. The pure bending moment characteristics and the deformation of the cross-section were performed for a 25 × 25 × 2 mm square tube made of S235JR structural steel. The innovative approach for determining the parameters of cold bending square tubes pertained to considering the stress state in the preserved material in individual areas of their cross-section. The results of numerical modeling—after considering the history of deformation (i.e., the process of forming a square pipe from a pipe with a circular cross-section)—gave a satisfactory agreement with the results of experimental tests, both in terms of the degree of pipe wall deflection and the characteristics of the bending moment.
“…The topic about the occurrence of collapse is seldom investigated for few articles were found. Leu and Wu [11] had ever explored the effects of various parameters on the degree of asymmetry and the occurrence of collapse for squaring circular tube between two V-shape die in single pressing direction.…”
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