Abstract
The paper presents modeling and calculations of multi-bolted connections at the assembly stage on an example of the engine cylinder head-block connection. The physical model of the connection was introduced as a combination of three subsystems: the set of bolts, the joined element and the contact layer between the joined element and the rigid support. The finite element method (FEM) was used for the modeling. Bolts were replaced with hybrid elements. The joined element was modeled with spatial finite elements. The Winkler model of the contact layer has been taken into consideration. The truth of the theorem has been examined, according to which non-linearity of the contact layer has a negligible impact on the final values of the bolt forces in the case of sequential preloading of the multi-bolted connection. The results of the calculations of a selected multi-bolted connection have been compared with the experimental results.
Highlights
Multi-bolted connections are treated as non-linear systems in the calculations
In the developed multi-bolted connection model, it is assumed that: a) the bolt model can be represented as a model, wherein the plain part of the bolt is modeled as a beam and its head as a rigid element [8], b) bolts are tightened by preloads normal to the contact surface between the joined elements, c) the flexible joined element is modeled with spatial finite elements, d) the contact layer between the joined elements is treated as the nonlinear Winkler elastic foundation model
The assembly process of the multi-bolted connection is conducted by sequentially tightening of the bolts
Summary
Multi-bolted connections (composed of many objects remaining in contact) are treated as non-linear systems in the calculations. In the developed multi-bolted connection model, it is assumed that: a) the bolt model can be represented as a model, wherein the plain part of the bolt is modeled as a beam and its head as a rigid element [8], b) bolts are tightened by preloads normal to the contact surface between the joined elements, c) the flexible joined element is modeled with spatial finite elements, d) the contact layer between the joined elements is treated as the nonlinear Winkler elastic foundation model. The assembly process of the multi-bolted connection is conducted by sequentially tightening of the bolts This incremental process is related to increasingly complete clamping of the contact layer between the joined elements. The results of numerical simulations have been compared with the experimental results shown in [9]
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