Modeling Complex Contact Phenomena with Nonlinear Beamshells

Modeling Complex Contact Phenomena with Nonlinear Beamshells

Bibliographic Details
Main Author: Brink, Adam Ray
Language:English
Published: University of Akron / OhioLINK 2015
Subjects:
Mechanical Engineering
micro slip
joints
nonlinear beams
mechanical contact
receding contact
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=akron1429395652
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-akron14293956522021-08-03T06:30:17Z Modeling Complex Contact Phenomena with Nonlinear Beamshells Brink, Adam Ray Mechanical Engineering micro slip joints nonlinear beams mechanical contact receding contact As built-up engineering structures (i.e. structures consisting of many individual piecesconnected together) become more complicated and expensive, the need to accuratelymodel their response to dynamic events increases. Take for example electronicsmounted to a satellite via a bolted connection. Without the proper understandingof how the electronics will react during launch, the connection will either be overdesigned, resulting in excess weight, or under designed, resulting in possible damageto the unit. In bolted connections, energy dissipation due to micro-slip (partial slippingof an elastic body in contact that occurs prior to slipping of the entire contactpatch) is often the dominating damping mechanism. Capturing this type of nonlineardamping is often challenging within a simulation of large-scale structures. Finite elementfalls short due to the small element size required to achieve a converged solutionin the contact patch. Researchers have been developing reduced order models thatcapture the micro-slip phenomenon without the numerical penalty associated withfinite element analysis. This work shows that nonlinear beamshells could be used asa reduced order model for elastic bodies connected with a frictional connection whichexhibits energy dissipation due to micro-slip.In this work we consider the energy dissipated from an elastic shell on a rigidfoundation and focus on two unique contact phenomenon: the effect of shear leading to load transfer beyond the slip zone, and the effect of compressive material loadsthat can give rise to receding contact areas. Both phenomenon are investigated usingthe nonlinear geometrically exact shell theory. It is concluded that edge shearingeffects serve to reduce the energy dissipated from the system. This is studied withnonlinear shell theory and validated with finite element analysis. Likewise, it has beenpostulated that changing contact patch areas during oscillations effects the energydissipated per load cycle. This work expands on current nonlinear shell theory toaccount for through thickness compressive stresses as applied to a Cosserat surface.Several examples are solved to show the effects of the expanded nonlinear beamshelltheory. 2015-05-19 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1429395652 http://rave.ohiolink.edu/etdc/view?acc_num=akron1429395652 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Mechanical Engineering
micro slip
joints
nonlinear beams
mechanical contact
receding contact
spellingShingle Mechanical Engineering
micro slip
joints
nonlinear beams
mechanical contact
receding contact
Brink, Adam Ray
Modeling Complex Contact Phenomena with Nonlinear Beamshells
author Brink, Adam Ray
author_facet Brink, Adam Ray
author_sort Brink, Adam Ray
title Modeling Complex Contact Phenomena with Nonlinear Beamshells
title_short Modeling Complex Contact Phenomena with Nonlinear Beamshells
title_full Modeling Complex Contact Phenomena with Nonlinear Beamshells
title_fullStr Modeling Complex Contact Phenomena with Nonlinear Beamshells
title_full_unstemmed Modeling Complex Contact Phenomena with Nonlinear Beamshells
title_sort modeling complex contact phenomena with nonlinear beamshells
publisher University of Akron / OhioLINK
publishDate 2015
url http://rave.ohiolink.edu/etdc/view?acc_num=akron1429395652
work_keys_str_mv AT brinkadamray modelingcomplexcontactphenomenawithnonlinearbeamshells
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