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Dimensional stability of materials subject to random vibration

Dimensional stability of materials subject to random vibration
Dimensional stability of materials subject to random vibration
High precision stable structures are potentially vulnerable to dimensional instability induced by exposure to random vibration. There appears to have been little work in the literature to understand or mitigate structural dimensional instability induced by random vibration. To gain more insight into this issue, a novel test was recently developed to assess the plastic strain response in the 10?5 to 10?6 range for structural materials subjected to specific random vibration loads. The test was based on a four-point bending configuration with an applied random base excitation. Two types of material were tested – an Al alloy and a CFRP. This paper presents the test setup and results in detail. The Al alloy samples were found to grow slightly in length during testing, due to a small non-symmetry in the applied load. An FEA model of the test setup was solved in the time domain for a sequence of cyclic loads whose amplitude was based on their probability of exceedance in the random environment. This model, using nonlinear kinematic hardening, was able to predict the residual strain response observed during testing with good accuracy. The main implication of this finding is that ultra stable structures subject to random vibration should be assembled in the most strain-free state possible to avoid loss of dimensional stability due to cyclic hardening.
dynamics, cyclic loading, mechanical testing, finite elements
0141-6359
323-335
Edeson, R.L.
dc1e3235-c263-453b-8aea-ab92ea1c83b4
Aglietti, G.S.
01e8beed-9b02-4498-8d01-fee3e3e6ff3c
Tatnall, A.R.L.
8b3b9a71-2bc4-459d-8af2-67feb6b984fe
Edeson, R.L.
dc1e3235-c263-453b-8aea-ab92ea1c83b4
Aglietti, G.S.
01e8beed-9b02-4498-8d01-fee3e3e6ff3c
Tatnall, A.R.L.
8b3b9a71-2bc4-459d-8af2-67feb6b984fe

Edeson, R.L., Aglietti, G.S. and Tatnall, A.R.L. (2013) Dimensional stability of materials subject to random vibration. Precision Engineering, 37 (2), 323-335. (doi:10.1016/j.precisioneng.2012.10.001).

Record type: Article

Abstract

High precision stable structures are potentially vulnerable to dimensional instability induced by exposure to random vibration. There appears to have been little work in the literature to understand or mitigate structural dimensional instability induced by random vibration. To gain more insight into this issue, a novel test was recently developed to assess the plastic strain response in the 10?5 to 10?6 range for structural materials subjected to specific random vibration loads. The test was based on a four-point bending configuration with an applied random base excitation. Two types of material were tested – an Al alloy and a CFRP. This paper presents the test setup and results in detail. The Al alloy samples were found to grow slightly in length during testing, due to a small non-symmetry in the applied load. An FEA model of the test setup was solved in the time domain for a sequence of cyclic loads whose amplitude was based on their probability of exceedance in the random environment. This model, using nonlinear kinematic hardening, was able to predict the residual strain response observed during testing with good accuracy. The main implication of this finding is that ultra stable structures subject to random vibration should be assembled in the most strain-free state possible to avoid loss of dimensional stability due to cyclic hardening.

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e-pub ahead of print date: 9 October 2012
Published date: April 2013
Keywords: dynamics, cyclic loading, mechanical testing, finite elements
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 354636
URI: http://eprints.soton.ac.uk/id/eprint/354636
ISSN: 0141-6359
PURE UUID: 7a81c528-652e-4f34-a625-9225bbbc3b28

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Date deposited: 17 Jul 2013 10:30
Last modified: 18 Nov 2019 20:37

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Contributors

Author: R.L. Edeson
Author: G.S. Aglietti
Author: A.R.L. Tatnall

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