The compressive behavior of a composite cylindrical pyramidal lattice structure manufactured with a new production methodology

Mohammadi, Masoud; Sadeghi, Ali

doi:10.1177/0954408920908135

Cited by 5 publications

(2 citation statements)

References 36 publications

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“…7,8 The reinforcements like graphene and carbon tubes reportedly increased the compressive strength of composite matrix for manufacturing durable products. 9,10 Polyvinylidene fluoride (PVDF) is one of the thermoplastics having acceptable properties for filter membrane, distillation, and energy storage-like applications. 11,12 Acceptable piezoelectric properties of PVDF composites have been observed due to reinforcements like graphene and BiFeO 3 powders for sensor applications.…”

Section: Introductionmentioning

confidence: 99%

Secondary recycled polyvinylidene–limestone composite in 4D printing applications for heritage structures: Rheological, thermal, mechanical, spectroscopic, and morphological analysis

Kumar

Singh

Ahuja

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Polymer 3D printing has motivated researchers toward the use of this technology for the maintenance and repair of heritage structures. This results in the exploration of different thermoplastic composites as smart materials having properties like programmable features (one-way, two-way), sensing, etc. Also, the excessive use of thermoplastics in various fields has resulted in plastic solid waste management issues. Several studies have been reported on plastic solid waste management with 3D printing. But hitherto little has been reported on the use of heritage site debris as reinforcement in the thermoplastic matrix for addressing issues of plastic solid waste management as well as for inducing controlled 4D capabilities; for better maintenance and repair of the heritage site with shorter maintenance and repair time. The present study is focused on secondary (2˚) recycling of polyvinylidene fluoride thermoplastic material by reinforcing limestone (CaCO3 of 220 mesh size as per American Foundry Society (AFS)) collected as debris from heritage site for 3D printing applications followed by an analysis of its possible 4D capabilities. Different compositions/proportions of polyvinylidene fluoride–limestone were explored for acceptable rheological (melt flow index and viscosity), thermal (based on differential scanning calorimetry), mechanical (based on universal testing machine), and spectroscopic properties (based on attenuated total reflection-Fourier transformed infrared and photoluminescence). Piezoelectric property analysis of 3D printable composition/proportion and shape-memory effect of each composition/proportion was performed to investigate the 4D characteristics of the proposed composite. The results of the study suggest that polyvinylidene fluoride–6% limestone is a better composition/ proportion with acceptable rheological, thermal, and mechanical properties (melt flow index 2.429 g/10 min, viscosity 12742.9 Pa-s, thermal heat capacity 31.66 Jg−1, and Young's modulus 286.56 MPa) for selected heritage structures. For 4D capabilities, piezoelectric coefficient (D33 21.79 pC/N) and shape recovery (44.31%) have been ascertained for the best composition/ proportion selected. Further morphological analysis has been reported to support the test results.

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Section: Introductionmentioning

confidence: 99%

Secondary recycled polyvinylidene–limestone composite in 4D printing applications for heritage structures: Rheological, thermal, mechanical, spectroscopic, and morphological analysis

Kumar

Singh

Ahuja

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…However, the water-soluble mandrel cannot be reused. Mohammadi M et al studied the soft rubber mandrel [17]. Through the grooved rubber mandrel, the prepreg is paved on the groove for curing.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic Mandrel for Manufacturing Composite Components with Complex Structure

Jing

Chen

et al. 2021

Aerospace

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This study was to solve the mandrel demolding problem after curing the composite component with complex structure. In this paper, a reusable thermoplastic mandrel with heating softening characteristics was developed by resin transfer molding (RTM). The glass transition temperature (Tg), surface roughness, and reusability of the mandrel, as well as the shape, surface roughness, thickness uniformity, and internal quality of the formed structure, were tested. The result showed that the Tg of the mandrel was between 80 and 90 °C and the surface roughness was less than Ra 0.5 μm. Additionally, the mandrel can be recycled and can still maintain a good shape after 20 times of deformation. By using this method, the demolding process can be realized by heating and softening the mandrel. The profile error of the formed structure was within 0.5 mm, the surface roughness was less than Ra 0.5 μm, the thickness error was within 0.2 mm, and the average porosity of the upper and lower halves of composite parts was 0.72% and 0.61%. All those data showed that the formed part was in good shape and of good quality. The thermoplastic mandrel can solve the demolding problem of composite materials with complex shapes.

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A thermoplastic resin matrix and its physical properties suitable for deformable mandrel

Lü

Jing

Zou

et al. 2021

J. Phys.: Conf. Ser.

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The mandrel is able to shape the part cavity, therefore is of great significance for composite parts in the manufacturing of carbon fiber reinforced polymer(CFRP) composite part. However, in the manufacturing of composite parts with complex cavities, traditional rigid mandrel cannot be removed out of the cavity in any direction after the outer prepreg is cured. To solve the problem of difficult demolding, a kind of deformable mandrel emerged. The deformable mandrel is rigid at room temperature to support composite part curing. While at relatively high temperatures, the mandrel is softened so that the mandrel can be easily removed from the composite part despite the complex part cavity shape, therefore resolving complications regarding the demolding process. In this paper, a thermoplastic resin material matrix suitable for the preparation of deformable mandrel is proposed. Ingredient and manufacturing flow of the thermoplastic resin matrix are introduced, and the applicability of the proposed matrix with regard to the deformable mandrel is validated through dynamic mechanical analysis.

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The compressive behavior of a composite cylindrical pyramidal lattice structure manufactured with a new production methodology

Cited by 5 publications

References 36 publications

Secondary recycled polyvinylidene–limestone composite in 4D printing applications for heritage structures: Rheological, thermal, mechanical, spectroscopic, and morphological analysis

Secondary recycled polyvinylidene–limestone composite in 4D printing applications for heritage structures: Rheological, thermal, mechanical, spectroscopic, and morphological analysis

Thermoplastic Mandrel for Manufacturing Composite Components with Complex Structure

A thermoplastic resin matrix and its physical properties suitable for deformable mandrel

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