Abstract
The current paper focuses on the impact phenomenon analysis, in the case of multi-body mechanical systems undergoing fast motion, due to the presence of some manufacturing and mounting errors or due to some accident during the transport mechanical systems. Thus, the impact phenomenon was analyzed in two cases, the first one consisting of a two bodies, namely, a free-fall body brought in contact with the other considered fixed in space and the second case, which is a complex one, when the analyzed bodies are components of a multi-body mechanical system. The research main objective is to analyze the impact generated between the two bodies through three methods, i.e., the analytical method, a virtual prototyping method accomplished with MSC Adams software and a method based on finite element analysis with Ansys and Abaqus software. A dynamic model of the impact force was developed, which allows to make a comparison of the numerical results obtained through the abovementioned methods. As a multi-body mechanical system, it was considered a mechanism from an internal combustion engine from which the radial clearance between the piston bolt and connecting rod head of the considered mechanism was analyzed.
Highlights
The current paper focuses on the impact phenomenon analysis, in the case of multibody mechanical systems undergoing fast motion, due to the presence of some manufacturing and mounting errors or due to some accident during the transport mechanical systems
Based on the results reported in [21], a comparison between different contact-impact force models for a crank and connecting rod mechanism were made
These variations correspond to an impact force dynamic model where the damping coefficient is equal to c = 6
Summary
The impact phenomenon can be present in the case of multi-body systems and this can be generated by many causes such as mounting and manufacturing errors, discontinuities of kinematic parameters variation or critical situation (for example, vehicle collision, etc.). An important argument for controlling the input parameters for impact modeling relays on simple numerical simulations like the one reported in [15], where the developed numerical simulations examine the perforation of steel and aluminum plate specimens and impact load is applied on composite plates with eight layers reinforced by carbon fibers For this ABAQUS software was used for several numerical models of solid penetration i.e., Mohr-Coulomb model, Johnson-Cook model, Zerilli-Armstrong model, Steinberg-Guinam model and a thermo-mechanical material model. In order to achieve this several contact analyses it will be proposed, namely with and without friction, with and without damping effect and for different dynamic impact force parameters Another novel element is represented by the three impact modeling methods used, namely analytical, virtual prototyping and FEM analysis. The desired data can be compared through experimental analyses conducted on similar models for analyzing impact phenomena
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