Plastics. Determination of flexural properties

1993 ◽  
Keyword(s):  
Flexural Properties

scholarly journals Nanomechanics of few-layer materials: do individual layers slide upon folding?

2020 ◽  
Vol 11 ◽  
pp. 1801-1808
Author(s):  
Ronaldo J C Batista ◽  
Rafael F Dias ◽  
Ana P M Barboza ◽  
Alan B de Oliveira ◽  
Taise M Manhabosco ◽  
...  
Keyword(s):  
2D Materials ◽  
Adhesion Energy ◽  
Flexural Properties ◽  
2D Systems ◽  
Number Of Layers ◽  
Graphene Flakes ◽  
Theoretical Predictions ◽  
Tip Enhanced Raman Spectroscopy ◽  
Good Agreement

Folds naturally appear on nanometrically thin materials, also called “2D materials”, after exfoliation, eventually creating folded edges across the resulting flakes. We investigate the adhesion and flexural properties of single-layered and multilayered 2D materials upon folding in the present work. This is accomplished by measuring and modeling mechanical properties of folded edges, which allows for the experimental determination of the bending stiffness (κ) of multilayered 2D materials as a function of the number of layers (n). In the case of talc, we obtain κ ∝ n 3 for n ≥ 5, indicating no interlayer sliding upon folding, at least in this thickness range. In contrast, tip-enhanced Raman spectroscopy measurements on edges in folded graphene flakes, 14 layers thick, show no significant strain. This indicates that layers in graphene flakes, up to 5 nm thick, can still slip to relieve stress, showing the richness of the effect in 2D systems. The obtained interlayer adhesion energy for graphene (0.25 N/m) and talc (0.62 N/m) is in good agreement with recent experimental results and theoretical predictions. The obtained value for the adhesion energy of graphene on a silicon substrate is also in agreement with previous results.

F-1121 Determination of Flexural Properties for Unidirectional CFRP

2001 ◽  
Vol VI.01.1 (0) ◽  
pp. 223-224
Author(s):  
Takayuki Yamamoto ◽  
Masayuki Nakada ◽  
Yasusi Miyano ◽  
Tetsuji Watanabe
Keyword(s):  
Flexural Properties

Determination of Flexural Properties of Rigid PUR Foams Using Digital Image Correlation

2014 ◽  
Vol 216 ◽  
pp. 116-121 ◽  
Author(s):  
Tudor Voiconi ◽  
Emanoil Linul ◽  
Liviu Marşavina ◽  
Tomasz Sadowski ◽  
Marcin Kneć
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Surface Deformation ◽  
Flexural Modulus ◽  
Image Correlation ◽  
Flexural Properties ◽  
Cell Diameter ◽  
2D System ◽  
Increase In Accuracy

Cellular materials represent a new class of materials; main parameters that characterize the cellular structure are relative density, shape of the cell (open or closed), wall thickness and cell diameter. The purpose of this paper is to investigate the microstructure of foams materials and also to determine the flexural properties of this rigid PUR foams using Digital Image Correlation (DIC). The rigid PUR foams cells morphology and pore distribution for three densities (100, 145 and 300 kg/m3) were studied before testing through scanning electron microscopy. Determination of flexural properties was carried out on rectangular beam samples using ARAMIS 2D system. This method provides a substantial increase in accuracy for measuring strain and is based on the calculation of surface deformation using a set of digital images from undeformed stage to different deformed stages. The specimens were subjected to static three points bending tests with loading rate of 2 mm/min, at room temperature and loading was applied in rise direction of the foam. Experimental results show that main mechanical properties such as flexural modulus and flexural strength values increases with increasing of density.

Influence of SLS processing parameters according to the new mathematical model on flexural properties

2016 ◽  
Vol 22 (2) ◽  
pp. 258-268 ◽  
Author(s):  
Ana Pilipović ◽  
Bogdan Valentan ◽  
Mladen Šercer
Keyword(s):  
Mathematical Model ◽  
Selective Laser Sintering ◽  
Processing Parameters ◽  
Laser Sintering ◽  
Flexural Properties ◽  
Content Type ◽  
Manufacturing Procedure ◽  
Fabrication Parameters ◽  
Selection Of

Purpose The purpose of this paper is the selection of production parameters in selective laser sintering – SLS for the production of quality products (e.g. good mechanical properties). The manufacturing procedure affects the properties, which is especially significant in additive procedures, as the products are not cheap and the procedure and material need to be optimally selected. Design/methodology/approach The paper presents an analysis of the fabrication parameters in selective laser sintering (SLS) that affect the flexural properties of the finished product. Findings The influence of a new parameter has been found, the overlay ratio, and using the mathematical and scheme method, the selection of parameters for obtaining the optimal flexural properties has been proposed. Originality/value The paper presents a new mathematical model for the calculation of the processing parameters in SLS of polymer products and gives a diagram for the determination of which parameters are the best to use for practical purposes.

Plastics. Determination of flexural properties

2003 ◽  
Keyword(s):  
Flexural Properties
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