SUMMARYGypsum plasterboards are widely used for compartmentation and for retarding the spread of fire in buildings. Although numerous heat transfer studies have been conducted, literature indicates there are extensive differences in the thermal properties used in these studies. Comprehensive experimental and numerical analyses have been conducted to elucidate the leading factor in the ablation of a gypsum board system when it is exposed to the standard fire resistance test. A methodology based on both simultaneous thermal analysis and computational modelling is proposed to understand the behaviour of a gypsum plasterboard when the boundary temperature increases quickly as one side of the wall is subjected to the standard ISO 834. Finally, four different wall assemblies made of a commercial fireproof plasterboard system are exposed to the standard test. The temperature on the unexposed face is examined to validate the computational model of the plasterboard.
Polyetheretherketone (PEEK) has been the focus of substantial additive manufacturing research for two principal reasons: (a) the mechanical performance approaches that of aluminum at relatively high temperatures for thermoplastics and (b) the potential for qualification in both the aerospace and biomedical industries. Although PEEK provides outstanding strength and thermal stability, printing can be difficult due to the high melting point. Recently, high-temperature soluble support has enabled the printing of lattices and stochastic foams with overhanging features in these high-performance carbon fiber thermoplastics, in which density can be optimized to strike a balance between weight and strength to enhance performance in applications such as custom implants or aerospace structures. Although polymer powder bed fusion has long been capable of the combination of these geometries and materials, material extrusion with high-temperature sacrificial support is dramatically less expensive. This research provides a comprehensive mechanical analysis and CT-scan-based dimensional study of carbon fiber PEEK lattice structures enabled with high-temperature support and including model validation.
This artice presents an exhaustive analysis of the mechanical behavior of a steel tube during its sinking drawing. The methodology consisted in three stages, respectively, devoted to tensile testing, tube drawing in laboratory at different strain rates and, finally, mechanical characterization via modelling and simulation of the material behavior in these two tests. The derivation of the material parameters accounting for both isotropic hardening and rate-dependent effects is particularly addressed. The obtained numerical results are satisfactorily validated with the corresponding experimental measurements. Finally, a sensitivity study of the effect of the die entry semiangle on the drawing force and residual stresses is also performed in order to illustrate the capability of the methodology as a useful tool, depending on the further application of the tube, for die design.
The production, use, and poor management of polymers, and especially of expanded polystyrene, have resulted in various environmental challenges, such as large-scale waste generation, accumulation of toxic substances, and the pollution of natural resources, chiefly of water and soil. Consequently, nations around the world are investing considerable research effort into developing waste treatment and reduction solutions. Some areas have even enacted bans against the use of the material, however, in the Colombian case, it continues to be highly represented in the industry, and given the low cost of this packaging, little effort has been made to find a replacement. Expanded polystyrene is a thermoplastic polymer with low weight, low thermal conductivity, low cost, and low water absorption; factors which have made it a less attractive target for recycling. It has, however, excellent resistance to mechanical compression, which makes it viable for study in other applications such as those considered in the present study, offering advantages in terms of environmental protection without the need to completely eliminate the use of the material. The present study analyses the effects of integrating waste expanded polystyrene into the process of creating waterproofing paint. The research is divided into three major phases: the first focusing on the determination of the paint’s technical requirements using previous research and by means of initial testing; the second, on elimination tests to validate the properties of various samples before preparing the final paint mixture; and finally, a third phase of final tests required for a waterproof paint. The final formula is applied to common materials in the construction sector, such as wood, metal, glass, and concrete, to validate each of the required properties. Among the main results, technical viability was identified in the second sample, which demonstrated the best results at a ratio of 1: 2.5: 2.5 of waste expanded polystyrene, D-limonene and methyl acetate, respectively.
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