Effect of statistical correlation between ply mechanical properties on reliability of fibre reinforced plastic composite structures

2014 ◽  
Vol 49 (23) ◽  
pp. 2935-2945 ◽  
Author(s):  
Shufeng Zhang ◽  
Chunhua Zhang ◽  
Xun Chen
Keyword(s):  
Mechanical Properties ◽  
Composite Structures ◽  
Statistical Correlation ◽  
Plastic Composite ◽  
Reinforced Plastic

scholarly journals EVALUATION OF GROOVING METHOD TO POSTPONE DEBONDING OF FRP LAMINATES IN WPC-FRP BEAMS

2014 ◽  
Vol 20 (2) ◽  
pp. 237-246 ◽  
Author(s):  
Shahin Lale Arefi ◽  
Morteza Naghipour ◽  
Zenonas Turskis ◽  
Mehdi Nematzadeh
Keyword(s):  
Mechanical Properties ◽  
Low Cost ◽  
Construction Material ◽  
Surface Preparation ◽  
Economic Benefits ◽  
Wood Plastic Composite ◽  
Plastic Composite ◽  
Reinforced Plastic ◽  
Economic Failure ◽  
Frp Sheet

The use of lightweight construction material with high corrosion resistance and low cost plays an important role in the design and construction of marine structures such as waterfronts. One of the most common methods for strengthening the structures is composite fibre reinforced plastic (FRP) sheet that is used for member retrofitting including wood plastic composite (WPC). The WPC material is produced from wood and compressed resin, which has good mechanical properties as well as economic benefits. The main problem of WPC reinforced with FRP sheets is the debonding of the sheet from WPC surface, which leads to premature and non-economic failure in members. One of the existing methods to solve this problem is surface preparation. However, surface preparation of wood plastic composite has some additional problems, such as operational cost, environmental pollution, etc. Therefore, to avoid debonding, another method has been used, known as the grooving method at the lower parts of beams. The laboratory used 50 I-shaped specimens with the same geometrical and mechanical properties. Initially, some slots such as longitudinal, transverse and diagonal grooves were created on the surface of specimens and filled by an epoxy. All beams were armed using one or two layers of GFRP sheets embedded at the lower part and were tested under four-point flexural loading. Grooves of different shapes, various widths and depths as well as the number of reinforcement layers were determined for considering their effect on the beam's behaviour. The results expressed that the debonding of FRP sheets can be delayed by selecting the longitudinal grooves with certain width and depth, which also leads to resistance improvement.

scholarly journals Experimental Identification of Statistical Correlation between Mechanical Properties of FRP Composite

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 674 ◽  
Author(s):  
Shufeng Zhang ◽  
Tongzhen Xing ◽  
Haibin Zhu ◽  
Xun Chen
Keyword(s):  
Mechanical Properties ◽  
Composite Structures ◽  
Accurate Determination ◽  
Correlation Coefficients ◽  
Field Method ◽  
Statistical Correlation ◽  
Image Correlation ◽  
Experimental Methodology ◽  
Fiber Reinforced ◽  
Frp Composite

Recent prediction on the heavy statistical correlation between the mechanical properties of fiber reinforced composite (FRP) raises new concerns on the accurate reliability evaluation of composite structures, but such statistical correlation still lacks experimental verification. In this work, an experimental methodology is proposed to determine the statistical correlation between mechanical properties of unidirectional FRP composite. A rectangular shaped carbon fiber reinforced plastic (CFRP) specimen with a circular hole is loaded by tension, and 3D digital image correlation (DIC) is employed to characterize the heterogeneous strain field around the hole. Virtual field method (VFM) is used to derive E11, E22, ν12, and G12 of specimens. Specimen configuration considering fiber angle and hole diameter is optimized to achieve accurate determination of correlation coefficients. Experimental results on the linear correlation coefficients between E11, E22, ν12, and G12 agree well with previous theoretical predictions.

scholarly journals Anti-Inflammatory Properties of Injectable Betamethasone-Loaded Tyramine-Modified Gellan Gum/Silk Fibroin Hydrogels

Biomolecules ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1456
Author(s):  
Isabel Matos Oliveira ◽  
Cristiana Gonçalves ◽  
Myeong Eun Shin ◽  
Sumi Lee ◽  
Rui Luis Reis ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Mechanical Properties ◽  
Silk Fibroin ◽  
Therapeutic Efficacy ◽  
Composite Structures ◽  
Gelation Time ◽  
Polymeric Materials ◽  
Gellan Gum ◽  
Traditional Use

Rheumatoid arthritis is a rheumatic disease for which a healing treatment does not presently exist. Silk fibroin has been extensively studied for use in drug delivery systems due to its uniqueness, versatility and strong clinical track record in medicine. However, in general, natural polymeric materials are not mechanically stable enough, and have high rates of biodegradation. Thus, synthetic materials such as gellan gum can be used to produce composite structures with biological signals to promote tissue-specific interactions while providing the desired mechanical properties. In this work, we aimed to produce hydrogels of tyramine-modified gellan gum with silk fibroin (Ty–GG/SF) via horseradish peroxidase (HRP), with encapsulated betamethasone, to improve the biocompatibility and mechanical properties, and further increase therapeutic efficacy to treat rheumatoid arthritis (RA). The Ty–GG/SF hydrogels presented a β-sheet secondary structure, with gelation time around 2–5 min, good resistance to enzymatic degradation, a suitable injectability profile, viscoelastic capacity with a significant solid component and a betamethasone-controlled release profile over time. In vitro studies showed that Ty–GG/SF hydrogels did not produce a deleterious effect on cellular metabolic activity, morphology or proliferation. Furthermore, Ty–GG/SF hydrogels with encapsulated betamethasone revealed greater therapeutic efficacy than the drug applied alone. Therefore, this strategy can provide an improvement in therapeutic efficacy when compared to the traditional use of drugs for the treatment of rheumatoid arthritis.

Dynamics of plastic composite structures

1981 ◽  
Vol 16 (5) ◽  
pp. 577-581
Author(s):  
A. R. Skovoroda ◽  
G. S. Shapiro
Keyword(s):  
Composite Structures ◽  
Plastic Composite
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