scholarly journals Investigation of the Deformation Behaviour of a Thermoplastic Fibre Metal Laminate

2013 ◽  
Vol 773-774 ◽  
pp. 503-511
Author(s):  
Anthony Sexton ◽  
Wesley Cantwell ◽  
Matthew Doolan ◽  
Shankar Kalyanasundaram
Keyword(s):  
Optical Measurement ◽  
Deformation Behaviour ◽  
Forming Limit Diagram ◽  
Advanced Materials ◽  
Forming Limit ◽  
Significant Finding ◽  
Fibre Metal Laminates ◽  
Specific Strength ◽  
Fibre Metal ◽  
Fibre Metal Laminate

Fibre metal laminates are sandwich materials comprised of a fibre-reinforced composite and a metal alloy. These advanced materials offer superior properties compared to the monolithic constituents; primarily, improved specific strength and stiffness compared to metals and improved impact and fatigue resistance when compared to composite materials. The use of these advanced materials is currently restricted to specialised applications where the superior properties justify the high cost of manufacturing. The formability of a fibre metal laminate based on a glass fibre reinforced polypropylene and an aluminium alloy is investigated in this study using techniques developed for the evaluation of metallic materials. Specimens of varying geometry were stretched over a hemispherical punch and an open die configuration was used to facilitate the acquisition of the strain using a using an optical measurement system. The experimental results were used to determine a forming limit diagram and to elucidate the safe forming limits of the material. In addition, the effect of specimen geometry on deformation behaviour was investigated by analysing the evolution of strain on the surface of the specimens. A significant finding of this study is that advanced materials such as fibre metal laminates can be formed in a similar manner to monolithic metals.

Deformation behaviour of steel/SRPP fibre metal laminate characterised by evolution of surface strains

2016 ◽  
Vol 3 (1) ◽  
pp. 61-75 ◽  
Author(s):  
J. Nam ◽  
Wesley Cantwell ◽  
Raj Das ◽  
Adrian Lowe ◽  
Shankar Kalyanasundaram
Keyword(s):  
Deformation Behaviour ◽  
Fibre Metal ◽  
Fibre Metal Laminate

A Challenge for Strain Optical Measurement for Bimetal

2011 ◽  
Vol 382 ◽  
pp. 392-395 ◽  
Author(s):  
De Hai Zhang ◽  
Ming Yi Wang ◽  
Yan Qin Li
Keyword(s):  
Optical Measurement ◽  
Effective Means ◽  
Forming Limit Diagram ◽  
Fixed Number ◽  
Fe Analysis ◽  
Image Correlation ◽  
Forming Limit ◽  
Bottom Surface ◽  
Circle Center ◽  
Before And After

A challenge method composed of digital image correlation (DIC) method, circle coordinate grid technology and finite element (FE) software to conduct strain measurement of bimetal is presented. This approach can carry out the prediction and measurement of strain. The coordinate grids are painted on top and bottom surface of bimetal when experiment and simulate specimen. Each node is named a fixed number in turn, and these numbers can precisely help to identify the same name point between FE software and the experiments specimen. The bimetal sheet has been tested using DIC software, circle center of the coordinates points can be accurately identify on the surface of bimetal. The changing of distance between adjacent points is computed to construct the forming limit diagram before and after forming. It is an effective means to evaluate the forming performance of bimetal and verify the reasonable of FE analysis results. 2A12 metal is conducted experiment using the challenge method in this paper, bimetal has not conduct experiment due to some reasons.

Describing tube formability during pulsating hydroforming using forming limit diagrams

2017 ◽  
Vol 52 (4) ◽  
pp. 249-257 ◽  
Author(s):  
Lianfa Yang ◽  
Daofu Tang ◽  
Yulin He
Keyword(s):  
Deformation Behaviour ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Hydraulic Pressure ◽  
Minor Strain ◽  
Steel Tubes ◽  
Periodic Oscillations ◽  
Forming Limit Diagrams ◽  
Uniform Wall ◽  
Forming Limit Curves

Pulsating hydroforming is a novel forming technique that applies pulsating hydraulic pressure to deform tubular materials. Larger expansions and more uniform wall thicknesses in tubes have reportedly been achieved using this technique. However, periodic oscillations of hydraulic pressure acting on the tubes during pulsating hydroforming make the tube deformation behaviour and formability unpredictable. Forming limit diagrams, which consist of two forming limit curves in a major–minor strain coordinate system, are widely used to indicate the formability of sheet materials in plastic deformation. The comparable use of forming limit diagrams to indicate the formability of tubular materials under the pulsating action of hydroforming has not been previously established. In this study, pulsating and non-pulsating hydro-bulging experiments were performed on SS304 stainless steel tubes. Under distinct tension–compression and tension–tension strain states with and without active axial feeding, the forming limit curves for the deformed tubes were constructed based on the experimental data. The effects of various hydraulic pressure pulsating parameters, including pulsating amplitude and frequency, on the forming limit curves were analysed and compared. The experimental results showed that each of the forming limit curves under pulsating hydro-bulging was higher than the forming limit curves under non-pulsating hydro-bulging, thereby confirming the influence of the pulsating parameters. In general, the height of the forming limit curves increased as the pulsating amplitude and frequency increased, largely independent of the tension–compression and tension–tension states. Overall, the results showed that the proposed method for determining the forming limit curves (and the subsequent forming limit diagram) for tubes during pulsating hydro-bulging is feasible.

Process Chains for Fibre Metal Laminates

2014 ◽  
Vol 1018 ◽  
pp. 285-292 ◽  
Author(s):  
Reimund Neugebauer ◽  
Verena Kräusel ◽  
Alexander Graf
Keyword(s):  
Thermoplastic Resin ◽  
Fibre Metal Laminates ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Major Disadvantage ◽  
Process Chains ◽  
Glass Fibre Reinforced Plastic ◽  
Glass Fibre Reinforced ◽  
Fibre Metal ◽  
Fibre Metal Laminate

The combination of fibre-reinforced materials with metals is defined as a fibre metal laminate. These material composites have already been a subject of research for several years. The long manufacturing time resulting from the period required for consolidation of the thermosetting resin is a major disadvantage of the fibre metal laminates previously in use (for instance GLARE, which is a combination of aluminium with glass fibre-reinforced plastic). In this paper, a new fibre metal laminate with a thermoplastic resin in the carbon fibre-reinforced plastics (CFRP) is introduced. The application of a thermoplastic resin system results in a general change in the process chain. The cutting of fibre metal laminates by means of the flexible water jet and laser cutting techniques is presented. In the second operation, forming behaviour is represented by the methods of v-bending and deep drawing. Finally, quality assurance by means of computed tomography, which replaces the conventional metallographic method, is described.

The effects of through tool cryogenic machining on the hole quality in GLARE® fibre metal laminates

2021 ◽  
Vol 64 ◽  
pp. 996-1012
Author(s):  
Khaled Giasin ◽  
Alisha Dad ◽  
Emmanuel Brousseau ◽  
Danil Pimenov ◽  
Mozammel Mia ◽  
...  
Keyword(s):  
Cryogenic Machining ◽  
Hole Quality ◽  
Fibre Metal Laminates ◽  
Fibre Metal

Optimization of Tube Hydroforming Process Using Probabilistic Constraints on Failure Modes

2011 ◽  
Vol 62 ◽  
pp. 21-35 ◽  
Author(s):  
Anis Ben Abdessalem ◽  
A. El Hami
Keyword(s):  
Failure Modes ◽  
High Reliability ◽  
Thickness Distribution ◽  
Tube Hydroforming ◽  
Forming Limit Diagram ◽  
Plastic Instability ◽  
Probabilistic Constraints ◽  
Forming Limit ◽  
Reliability Based Design ◽  
Hydroforming Process

In metal forming processes, different parameters (Material constants, geometric dimensions, loads …) exhibits unavoidable scatter that lead the process unreliable and unstable. In this paper, we interest particularly in tube hydroforming process (THP). This process consists to apply an inner pressure combined to an axial displacement to manufacture the part. During the manufacturing phase, inappropriate choice of the loading paths can lead to failure. Deterministic approaches are unable to optimize the process with taking into account to the uncertainty. In this work, we introduce the Reliability-Based Design Optimization (RBDO) to optimize the process under probabilistic considerations to ensure a high reliability level and stability during the manufacturing phase and avoid the occurrence of such plastic instability. Taking account of the uncertainty offer to the process a high stability associated with a low probability of failure. The definition of the objective function and the probabilistic constraints takes advantages from the Forming Limit Diagram (FLD) and the Forming Limit Stress Diagram (FLSD) used as a failure criterion to detect the occurrence of wrinkling, severe thinning, and necking. A THP is then introduced as an example to illustrate the proposed approach. The results show the robustness and efficiency of RBDO to improve thickness distribution and minimize the risk of potential failure modes.

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