scholarly journals Experimental and Numerical Evaluation of Direct Tension Test for Cylindrical Concrete Specimens

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Jung J. Kim ◽  
Mahmoud Reda Taha
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Tension Test ◽  
Tension Stress ◽  
Direct Tension ◽  
Element Analysis ◽  
Direct Tension Test ◽  
Concrete Cracking ◽  
Test Setup ◽  
Stress Uniformity

Concrete cracking strength can be defined as the tensile strength of concrete subjected to pure tension stress. However, as it is difficult to apply direct tension load to concrete specimens, concrete cracking is usually quantified by the modulus of rupture for flexural members. In this study, a new direct tension test setup for cylindrical specimens (101.6 mm in diameter and 203.2 mm in height) similar to those used in compression test is developed. Double steel plates are used to obtain uniform stress distributions. Finite element analysis for the proposed test setup is conducted. The uniformity of the stress distribution along the cylindrical specimen is examined and compared with rectangular cross section. Fuzzy image pattern recognition method is used to assess stress uniformity along the specimen. Moreover, the probability of cracking at different locations along the specimen is evaluated using probabilistic finite element analysis. The experimental and numerical results of the cracking location showed that gravity effect on fresh concrete during setting time might affect the distribution of concrete cracking strength along the height of the structural elements.

Poisson's ratio of plywood measured by tension test

Holzforschung ◽  
2009 ◽  
Vol 63 (5) ◽  
Author(s):  
Hiroshi Yoshihara
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Poisson’S Ratio ◽  
Tension Test ◽  
Experimental Results ◽  
Poisson's Ratio ◽  
Element Analysis ◽  
Young’S Moduli ◽  
Tension Tests ◽  
Finite Element Calculations

Abstract In this research, Poisson's ratio of plywood as obtained by a tension test was examined by varying the width of the specimen. The tension tests were conducted on five-plywood of lauan (Shorea sp.) with various widths, and Young's moduli and Poisson's ratios of the specimens were measured. Finite element calculations were independently conducted. A comparison of the experimental results with those of finite element analysis revealed that Young's modulus could be obtained properly when the width of the plywood strip varied. In contrast, the width of the plywood strip should be large enough to determine Poisson's ratio properly.

A Semi-Empirical Method for Estimating the Effective Leak and Vent Areas of an Airbag

1999 ◽  
Author(s):  
Aloysius U. Anagonye ◽  
J. T. Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Air Permeability ◽  
Empirical Method ◽  
Test Apparatus ◽  
Element Analysis ◽  
Test Setup ◽  
Surface Areas ◽  
Semi Empirical ◽  
Fabric Specimen

Abstract A semi-empirical method that utilizes tests from a small fabric specimen to quantify the effective leak and vent areas of an entire airbag is developed in this paper. The test setup and procedure used in the airbag material coupon tests are similar to the standard method used in determining air permeability of fabrics. A test apparatus for measuring the deflection of the fabric coupon was devised. Finite element analysis is used to compute the expanded vent and airbag surface areas of the coupon under various deformations. The leak and vent models were developed based on the results of a regression analysis. The effective vent area of a fabric coupon is a function of the ratio of the pressures across the fabric and the expanded vent area. Similarly, the effective leak area of a fabric coupon is a function of the ratio of the pressures across the fabric and the expanded surface area. The tested airbag materials were characterized with these models for use with finite element airbag models.

Evaluation of Crosslink Density Using Material Constants of Ethylene-Propylene-Diene Monomer/Styrene-Butadiene Rubber with Different Nanoclay Loading: Finite Element Analysis-Simulation and Experimental

2020 ◽  
Vol 12 (5) ◽  
pp. 632-642 ◽  
Author(s):  
S. Vishvanathperumal ◽  
V. Navaneethakrishnan ◽  
G. Anand ◽  
S. Gopalakannan
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Energy ◽  
Tension Test ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Element Analysis ◽  
Strain Behavior ◽  
Styrene Butadiene

Nanoclay is used to enhance the mechanical properties of ethylene-propylene-diene rubber (EPDM)/styrene-butadiene rubber (SBR) blends. Sulphur (S), dicumyl peroxide (P), and mixed systems (S + P) were used as crosslinking or vulcanizing agents for the EPDM/SBR nanocomposites. The experimental data of the stress–strain behavior of EPDM/SBR blends with different nanoclay loading have been determined through a tension test. Nonlinear mechanical behaviors of the rubbers are described by strain energy functions in order to assurance that rigid body motions play no role in the constitutive law. The mathematical model such as the Mooney-Rivlin model based on the existence of strain energy density functions depends on the right Cauchy-Green's deformation tensor or Green's strain tensor. The experimental data are fitted to the Mooney-Rivlin model in order to find the rubber material constants. These constants are used to find the crosslinking density. A comparison between the experimental stress–strain behavior and finite element analysis of a uniaxial tension test at different nanoclay loading is presented.

scholarly journals Uniaxial Tension of Yellow Meranti Timber at an Angle to the Grain

2017 ◽  
Vol 4 (2) ◽  
pp. 83-87
Author(s):  
Yosafat Aji Pranata ◽  
Roky Surono
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Tensile Strength ◽  
Uniaxial Tension ◽  
Experimental Tests ◽  
Experimental Results ◽  
Tension Stress ◽  
Structural Element ◽  
Element Analysis ◽  
Grain Angle

Tensile strength measures the force applied to a timber element/structural element to the point where it breaks. In this paper, a finite element analysis (FEA) of uniaxial tension of Yellow Meranti timber (Shorea spp.), using von Mises Criterion to include orthotropic nature of the material, was used to derive a prediction of tensile strength at an angle to the grain (cross grain) in plane stress (2D) modeling. To investigate the validity of the finite element analysis results, various 5°, 10°, and 15° cross grain specimens of Yellow Meranti (Shorea spp.) were tested in laboratory under uniaxial tension stress using UTM instrument. Comparison with experimental results shows that the FEA simulation predicts the stress-strain curves lower than experimental results, which result shows good agreement, it is seen from %-relative difference which is less than 30%. Calculations were performed with the numerical analysis (FEA) and Experimental Tests gives results that the difference is not too significant, for specimens with a grain angle of 5° difference in outcomes by 27%, for a grain angle of 10° difference in outcomes by 25%, and for a grain angle 15° difference in outcomes by 22%.

Finite element analysis of concrete cracking at early age

2011 ◽  
Vol 37 (5) ◽  
pp. 459-473 ◽  
Author(s):  
Mauren Aurich ◽  
Americo Campos Filho ◽  
Tulio Nogueira Bittencourt ◽  
Surendra P. Shah
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Early Age ◽  
Element Analysis ◽  
Concrete Cracking
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