Measurement of slip and separation in jointed structures with non-flat interfaces

Chen, Wei; Jin, Mengshi; Lawal, Iyabo; Brake, Matthew Robert; Song, Hanwen

doi:10.1016/j.ymssp.2019.106325

Cited by 28 publications

(14 citation statements)

References 30 publications

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“…Finally, the analysis of the two separate sides of the interface together with the follow on work performed on a separate beam [27], shows that local motion is extremely dependent on interface geometry. Consequently, the assumption of a perfectly flat and symmetric interface is an oversimplification that would be incompatible with predictive modeling frameworks.. To gain insights into how often and how much micro-scale topography influences dynamics o f jointed structures in general, further studies are needed.…”

Section: Discussionmentioning

confidence: 97%

“…top scheme in Figure 2b). In the follow on work [27], experiments are performed both the first and second in-plane bending modes for a similar system with a lap joint. For another comparison, the out-of-plane bending mode (near 104 Hz) is tested in this work, and for these tests the setup is rotated 90 degrees so that the shaker excites in the z direction (cf.…”

Section: Methodsmentioning

confidence: 99%

“…In this work, high-speed DIC is used to observe the contact motion effects of a bolted lap joint in an altered version of an academic testing structure [26]. Together with the subsequent work in [27], this research presents a novel combination of high-speed DIC and detection of sources of nonlinearity in jointed structures. The technique is applied successfully to a bolted lap joint, revealing its potential in being a new way to experimentally investigate sources of nonlinearity in many types of joints and structural connections as it allows for nonintrusive testing.…”

Section: Bronsmentioning

confidence: 99%

“…These beams are connected via a bolted lap joint, using three grade 5 5/16"-24 bolts as seen in Figure 1. In the follow on work [27], experiments are performed on other non-flat interfaces (concave and convex shapes).…”

Section: Test Specimen and Setupmentioning

confidence: 99%

See 3 more Smart Citations

Experimental Investigation of Local Dynamics in a Bolted Lap Joint Using Digital Image Correlation

Brøns

Kasper

Chauda

et al. 2020

Journal of Vibration and Acoustics

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Abstract The dynamics of structures with joints commonly show nonlinearity in their responses. This nonlinear behaviour can arise from the local dynamics of the contact interfaces. The nonlinear mechanisms at an interface are complicated to study due to the lack of observability within the contact interface itself. In this work, Digital Image Correlation (DIC) is used in combination with a high-speed camera to observe the local motion at the edge of the interface of a bolted lap joint. Results demonstrate that it is possible to use this technique to monitor the localised motion of an interface successfully. It is observed that the two beam parts of the studied lap joint separate when undergoing bending vibrations, and that there is a clear asymmetry in the response of the left and the right end of the interface. Profilometry indicates that the asymmetry in the response is due to the mesoscale topography of the contact interface, highlighting the importance of accounting for surface features in order to model the nonlinearities of a contact interface accurately.

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Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Bronsmentioning

confidence: 99%

Section: Test Specimen and Setupmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Investigation of Local Dynamics in a Bolted Lap Joint Using Digital Image Correlation

Brøns

Kasper

Chauda

et al. 2020

Journal of Vibration and Acoustics

View full text Add to dashboard Cite

show abstract

“…Note that the nonlinear interactions for this specimen, i.e. local stick and slip and contact-separation events between rough surfaces [46], lead to a non-smooth nonlinear force-deformation relation, which cannot be wellapproximated with low-order polynomials. In this work, the beam was kept assembled between the measurements to exclude the well-known variability due to reassembly.…”

Section: Experimental Setup and Testing Proceduresmentioning

confidence: 99%

Experimental assessment of polynomial nonlinear state-space and nonlinear-mode models for near-resonant vibrations

Kleyman

Tatar

Brake

et al. 2020

Mechanical Systems and Signal Processing

Self Cite

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In the present paper, two existing nonlinear system identification methodologies are used to identify data-driven models. The first methodology focuses on identifying the system using steady-state excitations. To accomplish this, a phase-locked loop controller is implemented to acquire periodic oscillations near resonance and construct a nonlinear-mode model. This model is based on amplitude-dependent modal properties, i.e. does not require nonlinear basis functions. The second methodology exploits uncontrolled experiments with broadband random inputs to build polynomial nonlinear state-space models using advanced system identification tools. The methods are applied to two experimental test rigs, a magnetic cantilever beam and a free-free beam with a lap joint. The respective models of both methods and both specimens are then challenged to predict dynamic, near-resonant behavior observed under different sine and sine-sweep excitations. The vibration prediction of the nonlinear-mode and state-space models clearly highlight the capabilities and limitations of the models. The nonlinear-mode model, by design, yields a perfect match at resonance peaks and high accuracy in close vicinity. However, it is limited to well-spaced modes and sinusoidal excitation. The state-space model covers a wider dynamic range, including transient excitations. However, the reallife nonlinearities considered in this study can only be approximated by polynomial basis functions. Consequently, the identified state-space models are found to be highly input-dependent, in particular for sinusoidal excitations where they are found to lead to a low predictive capability.

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Experimental studies on the energy dissipation of bolted structures with frictional interfaces: A review

Wang,

Ma,

Hong

et al. 2024

Friction

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Bolted joints play a more and more important role in the structure with lighter weight and heavier load. This paper aims to provide an overview of different experimental approaches for the dynamic behavior of structures in the presence of bolted joints, especially the energy dissipation or damping at frictional interfaces. The comprehension of energy dissipation mechanisms due to friction is provided first, while the key parameters and the measurement techniques, such as the excitation force, the preload of the bolt, or the pressure at the interfaces, are briefly introduced. Secondly, the round-robin systems aim to measure the hysteresis parameters of the frictional joints under tangential loads are reviewed, summarizing the basic theory and the strategies to apply the excitation force or acquire the response in different testing systems. Followed by parameter identification strategies for bolted structures, the test rigs with one or more simplified bolted joints are summarized to give an insight into the understanding of typical characteristics of bolted structures, which are affected by the presence of friction. More complex test rigs hosting real-like or actual engineering structures with bolted lap or flange joints are also introduced to show the identification process of the dynamic characteristics of bolted connections employed in specific applications. Based on the review paper, researchers can get the basic knowledge about the experimental systems of the bolted structures, especially several classical round robin systems, such as the Gaul resonator and widely used Brake-Reuß beam system. Readers can take advantage of this background for more creative and effective future studies, make more progress on the study of assembled structures and understand the influence of bolting frictional connections on the dynamic response better.

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Measurement of slip and separation in jointed structures with non-flat interfaces

Cited by 28 publications

References 30 publications

Experimental Investigation of Local Dynamics in a Bolted Lap Joint Using Digital Image Correlation

Experimental Investigation of Local Dynamics in a Bolted Lap Joint Using Digital Image Correlation

Experimental assessment of polynomial nonlinear state-space and nonlinear-mode models for near-resonant vibrations

Experimental studies on the energy dissipation of bolted structures with frictional interfaces: A review

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