Papers by Keyword: Explicit Dynamics

Abstract: This study investigates the careful investigation of cutting parameters to improve machining effectiveness and increase tool life while milling Nickel-Titanium Shape Memory alloy (NiTiNOL). The NiTiNOL material is employed to manufacture components such as, dental braces, seismic dampers and medical implants. Using Finite Element (FE) simulation, the research closely examines the intricate interactions among parameters, such as feed rate (f_r), depth of cut (D), and cutting speed (V_c). The use of Response Surface Methodology (RSM) and Taguchi has been used to determine the most optimal settings for tool longevity and machining efficiency. The FE simulation model provides a strong framework to investigate how cutting parameters affect necessary reactions. The present study examines interactions among parameters like cutting speed, depth of cut, and feed rate. Moderate cutting speed, lower depth of cut, and the highest feed rate has induced lower stress in the workpiece. This study adds to understanding NiTiNOL alloy machining fundamentals and offers useful information for industry applications. To attain better machining results while milling NiTiNOL alloy, the results are intended to guide an optimization technique

Abstract: Based on the explicit dynamic analysis method, the finite element models of successive shots and multiple shots for shot peening process are established by using LS-DYNA software.The simulations of the elastic-plastic dynamic process of shots impacting on a metallic target during shot peening process were accomplished. For Al2024-T3 alloy plate, the surface roughness induced by shot peening is studied and the effect of overlapping on the general trend is evaluated.The analysis results show that the surface roughness increases rapidly at the initial stage of shot peening and forms micro-scale pits. With the increase of the coverage, the surface deformation increased slowly when the surface coverage reached 100%.

Abstract: The structural analysis of quad rotor frame is important since it has to withstand the forces due to aerodynamics and gravitational force due to the mounted weights. Design optimization based on finite element analysis provides an efficient methodology to meet the desired objectives related to structural elements. In the present study, design optimization based on response surface methodology has been used to optimize the shape of the arm used in the quad rotor. The objectives considered for the study include minimization of Von Mises stress and total deformation. The goal driven optimization used in ANSYS WORKBENCH has been employed for the study and arm has been redesigned to meet the set goals.

Abstract: This research represents a design and analysis of Automatic loading copper wire machine for the actuator arm (ALCM). The process of copper wire placement on a single actuator arm type compensates human workers. In this research, copper wire placement set is made as a 3D model by computer program before undergoes arrangement analysis via explicit dynamic finite element method to study a suitable speed for copper wire placing. It is considered by characteristics of copper wire after placed and failures occurred during the process that will define suitable speed of motor rotation. The suitable speed is corresponding to copper wire characteristic as preferred, prevent copper wire fracture and time reduction compare to human work.

Abstract: According to the theory of collapse numerical simulation, the explicit finite element algorithm based on explicit dynamics was chose as the numerical calculation method. And combined with the plane RC frame collapse test and the example of ten layers frame structure, the wire frame model, integrated model and separate model were established and the alternate path method was adopted to study the simulate method of structural collapse. With the comparison of several aspects to the results, the rationality of the numerical simulation method and the applicability of the numerical models were verified respectively. At the same time, according to the complex pre-treatment process to the numerical simulation of structural collapse, an MFC program with the function of exporting APDL file which can generate wireframe models for structural collapse simulation in ANSYS/LS-DYNA was developed using VC++ language with the purpose of offering convenience to the numerical simulation process of structure collapse.

Abstract: Based on the finite element method of explicit dynamics and contact dynamics mechanics, a three dimensional solid finite element model was developed introducing physical elements for tapered roller bearing. The dynamic process numerical simulation of tapered roller bearing was carried out in ABAQUS. The vibration curves of the nodes on roller were drew. The changes of contact stress and contact stress distribution of rings, rollers and the cage in the process were analyzed. The results show it is basically consistent with the actual movement of rolling bearings.

Abstract: The drivers were hurt seriously by the vehicle steering column in the frontal collision. So a steering column with well energy-absorbing is very useful for the drivers. In this paper, the crashworthiness of a vehicle steering column is investigated by using the explicit dynamics finite element analysis method. Based on the proposed finite element model, the steering column with different material parameters including elastic modulus and yield strength are analyzed. Moreover, the displacement, velocity and energy absorption is discussed. The simulation results show that the crashworthiness of the vehicle steering column is significantly influenced by the yield strength. However, the elastic modulus has little effect on the crashworthiness.

Abstract: In this work, On the basis of software ANSYS/LS-DYNA, the strip cold rolling simulation model was established. The process from biting to rolling steady were simulated and investigated for 6-high UCM (6-high middle rolls shift type HC-mill with middle roll bender) cold mill, including the stress, stain state, and velocity field of the workpiece and rolls. The result states that the stability of Biting Process of 6-high cold mill is preferable and the impact of biting process on the roll is acceptable. The simulation regularity corresponds well with the measurements.

Abstract: The development of new products of seamless tubes require the development of corresponding grooves in order to manufacture tubes with high precision, high efficiency at low cost. In this work, a finite element model and dynamic simulation of continuous rolling pass for seamless tubes process has been implemented under the ANSYS/LS-DYNA environment to verify the validity of the pass design. The result show the deformation characteristic of cross-section, the variation regularity of rolling force, strain and stress conform to the reality. The work is effective for developing new grooves and products for seamless tube continuous rolling.

Abstract: In this paper, the universal nonlinear finite element software LS-DYNA is applied to the explicit dynamics simulation of shield’s soil cutting in tunneling, and using Non-reflective boundary of DYNA’s module, accurately conduct the dynamic analysis of shield’s tunneling. Finally Making visualization processing on the computed results with the post-processing soft LS-PREPOST. Compared with results of static’s simulation and small-sized shield experiment indoor, the explicit dynamics simulation used in the paper is in good agreement with them. Through the alleosis chat of internal energy, we can see that LS-DYNA can be commendably utilized to explicit dynamics simulation of soil cutting of shield’s cutter, simultaneously, we also concluded that moderately increasing the cutter opening rate will have a significant impact on improving the unearthed rate of soil residue, tunneling efficiency and lowering the total thrust force of the shield.