DCB test simulation of stitched CFRP laminates using interlaminar tension test results

2009 ◽  
Vol 69 (14) ◽  
pp. 2315-2322 ◽  
Author(s):  
Yutaka Iwahori ◽  
Kozue Nakane ◽  
Naoyuki Watanabe
Keyword(s):  
Tension Test ◽  
Test Results ◽  
Cfrp Laminates

Effects of resin pre-coating on interfacial bond strength and toughness of laminar CFRP with and without short aramid fibre toughening

2020 ◽  
Vol 54 (25) ◽  
pp. 3883-3893
Author(s):  
Binhua Wang ◽  
Guangzhi Ding ◽  
Gang Wang ◽  
Sisi Kang
Keyword(s):  
Carbon Fiber ◽  
Adhesive Layer ◽  
Aramid Fibre ◽  
Mode I ◽  
Test Results ◽  
Interfacial Bond Strength ◽  
Treatment Technology ◽  
Cfrp Laminates ◽  
Reinforced Polymer ◽  
Aramid Fibres

The brittle adhesive layer in carbon fiber-reinforced polymer (CFRP) laminates was strengthened by using short aramid fibers in this study. To ensure the feasibility and effectiveness of short aramid fiber interfacial toughening at the interface between the carbon-fiber face sheets, the self-prepared short aramid fibre tissue and the wettability treatment technology with resin pre-coating were applied to enable short aramid fibres to be well embedded in the uneven regions in the CFRP fabrics with fibres oriented at 0° and 90° to form a strong pulling resistance. The ultimate load and the mode I interlaminar fracture toughness have been improved by 75% and 103.9% from the double cantilever beam mode I crack propagation tests, respectively. The reinforcing mechanisms within the “composite adhesive layer” as a result of short aramid fibres are discussed together with detailed scanning electron microscopy observations and comparison test results.

Numerical Analysis on Mechanical Properties of Beams Reinforced by CFRP Laminates

2015 ◽  
Vol 744-746 ◽  
pp. 196-200
Author(s):  
Ning Zhuang ◽  
Hao Dong Sun ◽  
Song Ge
Keyword(s):  
Large Scale ◽  
Growth Failure ◽  
High Strength ◽  
Test Results ◽  
Cfrp Laminates ◽  
Fiber Reinforced Plastic ◽  
Four Point Bending ◽  
Reinforced Plastic ◽  
Low Weight ◽  
Cfrp Sheet

Carbon Fiber Reinforced Plastic (CFRP) has been widely used in large-scale concrete infrastructure’s reinforcement and renovation because of its low weight and high strength, which promotes CFRP application in the field of civil engineering. This paper two aged beams reinforced by CFRP sheet was loaded to failure in four-point bending by laboratory experiment. Then the numerical model was built to simulate the destruction process and compared with test results. Based on the studying of this paper, the changing law of beam’s stress, ultimate bearing capacity growth, failure mode and cracking propagation was investigated during the loading process. The research has guiding significance for the design and construction of concrete structures reinforced by CFRP laminates.

Test Analysis for RC Beams Strengthened with Externally Bonded Prestressed CFRP Laminates

2008 ◽  
Vol 385-387 ◽  
pp. 41-44 ◽  
Author(s):  
Shi Qi Cui ◽  
Jin Shan Wang ◽  
Zhao Zhen Pei ◽  
Zhi Liu
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Test Results ◽  
Test Analysis ◽  
Cfrp Laminates ◽  
Cfrp Sheet ◽  
Externally Bonded

Reinforced concrete beams strengthened with externally bonded CFRP sheet and prestressed CFRP are analyzed in this paper. Crack developments and displacements with curvatures for different beams are analyzed. Test results show that prestressed CFRP are able to control the development of macro cracks in concrete and prestressed CFRP is an effective method to improve the toughness of concrete, reduce strengthening cost and meanwhile enhance bearing capacity of concrete beams.

Re-Examining the Bulge Test: Methods for Improving Accuracy and Reliability

1991 ◽  
Vol 239 ◽  
Author(s):  
Martha K. Small ◽  
Joost J. Vlassak ◽  
William D. Nix
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Tensile Tests ◽  
Test Methods ◽  
Tension Test ◽  
Bulge Test ◽  
Test Results ◽  
Bulk Materials ◽  
Test Technique ◽  
Improving Accuracy

ABSTRACTSince its first application to thin films in the 1950's, the bulge test has had a prominent place in the field of thin film mechanical properties. The major appeal of the technique is that it is analogous to the familiar uniaxial tension test, which is commonly applied to bulk materials. At the same time, it avoids the sample tearing and alignment problems associated with micro-tensile tests. Unfortunately, bulge test results have been sometimes controversial and difficult to reproduce. In this paper we address possible causes for mese inconsistencies and describe a method by which the bulge test technique can be made to produce accurate and reliable results.

Stress-Stain Response of PVC Geomembrane under Uniaxial Tension Test

2014 ◽  
Vol 936 ◽  
pp. 1582-1586 ◽  
Author(s):  
Hai Min Wu ◽  
Yi Ming Shu
Keyword(s):  
Uniaxial Tension ◽  
True Strain ◽  
Tension Test ◽  
True Stress ◽  
Strain Response ◽  
Test Results ◽  
Stress Strain ◽  
Uniaxial Tension Test ◽  
Engineering Stress ◽  
Photographic Analysis

The mechanical property of polyvinyl chloride (PVC) geomembrane was usually expressed using engineering stress-strain response in traditional uniaxial tension test. By failing to account for deformation of specimen during the test, the deviation of true stress and strain maybe caused from the test results. In this paper, the true stress-strain response of PVC geomembrane was investigated using uniaxial tension test. The photographic analysis method was used to measure axial and lateral true strain of specimen. The Poissons ratio and true stress were also acquired based on measured true strain in the test. Then the true stress-strain relationship was obtained from the test results. By comparing with the engineering stress-strain results expressed by traditional method, it can be found that the engineering stress-strain result is unreasonable. The engineering stress-strain expression easily leads to the underestimation of the true stress.

scholarly journals Analysis of Equibiaxial Tension Tests for Hyperelastic EAP Film

2021 ◽  
Author(s):  
huaan luo ◽  
Yin-Long Zhu ◽  
Hai-Feng Zhao ◽  
Jing-Jing Zhang
Keyword(s):  
Simulation Analysis ◽  
Tension Test ◽  
Contour Error ◽  
Bulge Test ◽  
Material Strength ◽  
Model Parameters ◽  
Test Results ◽  
Element Analysis ◽  
Tension Tests ◽  
Radial Tension

Abstract Equibiaxial tension tests for hyperelastic electroactive polymers (EAPs) are important means to obtain the mechanical properties. There are three main methods: equibiaxial planar tension, radial tension and bulge test. The finite element analysis software is used to model and analyze the influence of testing apparatus, specimen geometric parameters on the test results and accuracy. The results show that the uniformity of the deformation of the square film can be effectively improved by using single corner point fixed tension in equibiaxial planar tension test, and the force error also decreased; the number of the cuts and the size of punched holes should be appropriate in radial tension test of circular diaphragm specimen to avoid the material strength failure caused by excessive tension along the edge of transition arc between grips and excessive deformation of tensile belt between the cuts; in bulge test, the sampled deformation data should be near the spherical pole to obtain more accurate stress-strain relationship owing to contour error and non-uniform deformation, a certain range of model parameters will limit the scope of simulation analysis. This paper proposed research provides guidance for the design of equibiaxial tension test apparatus and method to obtain more accurate test results.

CONTRIBUTION OF MECHANICAL ENGAGEMENT AND ENERGETIC INTERACTION IN REINFORCEMENT OF SBR-SILANE–TREATED SILICA COMPOSITES

2016 ◽  
Vol 89 (2) ◽  
pp. 292-305 ◽  
Author(s):  
Mohammad Alimardani ◽  
Mehdi Razzaghi-Kashani ◽  
Reza Karimi ◽  
Amirhossein Mahtabani
Keyword(s):  
Small Strain ◽  
Tension Test ◽  
Dynamic Strain ◽  
Test Results ◽  
Detectable Difference ◽  
Strain Sweep ◽  
Filler Network ◽  
Polymer Interactions ◽  
Filler Structure ◽  
Long Chain

ABSTRACT We evaluated the significance of mechanical engagement and energetic interaction between a polymer and a filler as two reinforcing mechanisms in SBR composites containing silica modified by short- and long-chain silanes. To exclude mechanical contributions of reinforcement from that of energetic contributions, surface energy of silica particles was systematically adjusted to prepare fillers of identical and diverse surface energies. Having analyzed interactions using a temperature sweep in a small-strain oscillatory test and a uniaxial tension test, results indicated that the chain length of the silane has remarkable influence on energetic filler–filler and filler–polymer interactions, but no detectable difference associated with filler–polymer mechanical engagement was observed from these experiments. However, dynamic strain sweep experiments showed that the rate of breakage of the filler network (Payne effect) is less for the composite having long-chain silane compared to that having short-chain silane. It was hypothesized that this behavior could be correlated to mechanical engagements of long-chain silanes existing on the filler structure.

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