The interactive bending wrinkling behaviour of inflated beams

Liu, Y. P.; Wang, C. G.; Tan, Huifeng; Wadee, M. Ahmer

doi:10.1098/rspa.2016.0504

Cited by 14 publications

(11 citation statements)

References 30 publications

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“…Therefore, it is reasonable for engineering analysis to assume that the volumeinduced internal pressure changes could be ignored. 12…”

Section: Comparison Of the Numerical And Experimental Resultsmentioning

confidence: 99%

“…Distinct from the global deflection analysis, there are three theoretical models are applied to describe the local wrinkling of the inflated beam: the membrane model, the shell model and the shell-membrane model. 12 Stein and Hedgepeth 13 predicted the wrinkling load by the membrane model, in which the wrinkles occurred when the axis stress dropped to zero. Moreover, Veldman 14,15 treated the material as a thin shell and considered the effect of the material property to investigate the wrinkle loads.…”

Section: Smentioning

confidence: 99%

“…Therefore, it is reasonable for engineering analysis to assume that the volume-induced internal pressure changes could be ignored. 12

Figure 29.The relationship of internal pressure, volume and load.…”

Section: Numerical Simulations Of Inflated Beamsmentioning

confidence: 99%

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Bending and wrinkling behaviours of polyester fabric membrane structures under inflation

Gan

Ran

et al. 2022

Journal of Industrial Textiles

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Membrane structures made of high-strength polyester fabrics are deployable and lightweight, which can be utilized in architecture, aerospace and marine structures. The design and optimization of an inflated structure depends on a thorough understanding of polyester fabric mechanics. In this work, firstly, the material properties of the polyester fabric membrane were analyzed by a tensile test. The bending and wrinkling behaviours of the inflated polyester fabric membrane were investigated by experimental, analytical and numerical methods. Specimens of varying internal pressures and diameters were subjected to bending tests with highly controlled loading and boundary conditions. It was found that the flexural capacity of the inflated membrane structure was positively correlated with the diameter and the internal pressure but decreased obviously with the occurrence and propagation of wrinkles. Based on the energy principle, the prediction formula of mid-span deflection was developed with the consideration of shear stiffness. Furthermore, the surface-based fluid cavity method was employed to set up a finite element model (FE model). The flexural behaviour of inflated membrane structure can be predicted by both the analytical and the numerical method, and the reliability was verified by comparing with the experiment

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“…Therefore, it is reasonable for engineering analysis to assume that the volumeinduced internal pressure changes could be ignored. 12…”

Section: Comparison Of the Numerical And Experimental Resultsmentioning

confidence: 99%

Section: Smentioning

confidence: 99%

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Bending and wrinkling behaviours of polyester fabric membrane structures under inflation

Gan

Ran

et al. 2022

Journal of Industrial Textiles

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“…We show the theoretical limits here to maintain the nowrinkling condition. If the wall of the inflated beam does not wrinkle, then the minimum axial stress, σ min in the inflated cylindrical beam is non-negative (σ min ≥ 0) [90,91], where…”

Section: Remark 1: No Wrinkling Conditionmentioning

confidence: 99%

Pneumatic elastostatics of multi-functional inflatable lattices: realization of extreme specific stiffness with active modulation and deployability

Sinha,

Mukhopadhyay

2024

R. Soc. Open Sci.

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As a consequence of intense investigation on possible topologies of periodic lattices, the limit of specific elastic moduli that can be achieved solely through unit cell-level geometries in artificially engineered lattice-based materials has reached a point of saturation. There exists a robust rationale to involve more elementary-level mechanics for pushing such boundaries further to develop extreme lightweight multi-functional materials with adequate stiffness. We propose a novel class of inflatable lattice materials where the global-level stiffness can be derived based on a fundamentally different mechanics compared with conventional lattices having beam-like solid members, leading to extreme specific stiffness due to the presence of air in most of the lattice volume. Furthermore, such inflatable lattices would add multi-functionality in terms of on-demand performances such as compact storing, portability and deployment along with active stiffness modulation as a function of air pressure. We have developed an efficient unit cell-based analytical approach therein to characterize the effective elastic properties including the effect of non-rigid joints. The proposed inflatable lattices would open new frontiers in engineered materials and structures that will find critical applications in a range of technologically demanding industries such as aircraft structures, defence, soft robotics, space technologies, biomedical and various other mechanical systems.

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“…Prior to buckling, inflated beams experience wrinkling. As greater force is applied to the beam, these wrinkles propagate in a ring around the beam until it reaches a critical point, after which it buckles [27]. As a result of this, chevron-shaped layers were used rather than rectangular layers to prevent undesired buckling by leaving uninterrupted lines around the robot body's circumference where it is not reinforced by…”

Section: A Soft Robot Body With Layer Jamming Pouchesmentioning

confidence: 99%

Dynamically Reconfigurable Discrete Distributed Stiffness for Inflated Beam Robots

Do,

Banashek,

Okamura

2020

Preprint

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Inflated continuum robots are promising for a variety of navigation tasks, but controlling their motion with a small number of actuators is challenging. These inflated beam robots tend to buckle under compressive loads, producing extremely tight local curvature at difficult-to-control buckle point locations. In this paper, we present an inflated beam robot that uses distributed stiffness changing sections enabled by positive pressure layer jamming to control or prevent buckling. Passive valves are actuated by an electromagnet carried by an electromechanical device that travels inside the main inflated beam robot body. The valves themselves require no external connections or wiring, allowing the distributed stiffness control to be scaled to long beam lengths. Multiple layer jamming elements are stiffened simultaneously to achieve global stiffening, allowing the robot to support greater cantilevered loads and longer unsupported lengths. Local stiffening, achieved by leaving certain layer jamming elements unstiffened, allows the robot to produce "virtual joints" that dynamically change the robot kinematics. Implementing these stiffening strategies is compatible with growth through tip eversion and tendonsteering, and enables a number of new capabilities for inflated beam robots and tip-everting robots.

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The interactive bending wrinkling behaviour of inflated beams

Cited by 14 publications

References 30 publications

Bending and wrinkling behaviours of polyester fabric membrane structures under inflation

Bending and wrinkling behaviours of polyester fabric membrane structures under inflation

Pneumatic elastostatics of multi-functional inflatable lattices: realization of extreme specific stiffness with active modulation and deployability

Dynamically Reconfigurable Discrete Distributed Stiffness for Inflated Beam Robots

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