Shear Strength of Fibrous Sheets: An Experimental Investigation

1997 ◽  
Vol 67 (8) ◽  
pp. 593-600 ◽  
Author(s):  
Ning Pan ◽  
Xiaoshan Zhang
Keyword(s):  
Experimental Investigation ◽  
Tensile Strength ◽  
Shear Strength ◽  
Anisotropic Materials ◽  
Strength Prediction ◽  
Plane Shear ◽  
Nonwoven Fabrics ◽  
Custom Made ◽  
Theoretical Predictions ◽  
The Relationship

This study of the shear strength of fibrous sheets first measures the in-plane shear strengths of various samples, including woven and nonwoven fabrics and paper, using a custom-made apparatus attached to an Instron tester. The structure of the apparatus and the measurement procedures are introduced in this article. The tested shear strength values are then compared with theoretical predictions from an earlier work. Discrepancies and possible causes are analyzed. Load-elongation curves for both tensile and shear are compared for individual fabrics and between fabrics. The relationship between the anisotropy of fabric tensile strength and the ratio of tested and predicted shear strength is explored. Also, the effect of fiber movement during textile deformation is examined. Finally, the original Tsai-Wu theory used for shear strength prediction of anisotropic materials is modified for application to the fibrous sheets, and the new predictions are provided for comparison.

Off-axis tensile strength and evaluation of the in-plane shear strength of paper

Holzforschung ◽  
2014 ◽  
Vol 68 (5) ◽  
pp. 583-590 ◽  
Author(s):  
Hiroshi Yoshihara ◽  
Masahiro Yoshinobu
Keyword(s):  
Tensile Strength ◽  
Shear Stress ◽  
Shear Strength ◽  
Stress Component ◽  
Shear Stress Component ◽  
Plane Shear ◽  
Dog Bone ◽  
Paper Filter ◽  
Failure Conditions ◽  
The Relationship

Abstract The off-axis tensile strength (OATS) of copy paper, filter paper, and sack paper was obtained from dog-bone specimens. The relationship between OATS and the off-axis angle (OAA) was predicted under several failure conditions. Additionally, the shear strengths (SS) of these papers were evaluated based on the results of OAT tests. The OATS could be accurately predicted under several Hill-type failure conditions. An equation for deriving the in-plane SS of these papers was proposed based on the tensile strength of the specimen with a 35° OAA, in which the contribution of the shear stress component was maximum.

Study on the Relationship between Soil-Cement Parameters and Unconfined Compressive Strength

2011 ◽  
Vol 255-260 ◽  
pp. 4012-4016
Author(s):  
Jun Qing Ma ◽  
You Xi Wang
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Shear Strength ◽  
Unconfined Compressive Strength ◽  
Deformation Modulus ◽  
Soil Cement ◽  
Strength And Deformation ◽  
Cement Soil ◽  
Relationship Of ◽  
The Relationship

This paper studies relationship between soil-cement parameters and unconfined compressive strength. The research in tensile strength and deformation modulus of soil-cement is an important basis for soil-cement failure mechanism and intensity theory. They also impact cracks, deformation and durability of cement-soil structure. Shear strength and deformation of soil-cement is important to the destruction analysis and finite element calculations. Therefore it needs to study on tensile strength, shear strength and deformation modulus of soil-cement. Based on previous experiments, the relationship of tensile strength, shear strength, deformation modulus and unconfined compressive strength of soil-cement are quantitatively studied.

Experimental Investigation of Flexure Properties for High-Strength Corrugated Composite Paperboard

2012 ◽  
Vol 200 ◽  
pp. 175-179
Author(s):  
Shi Bao Wen
Keyword(s):  
Experimental Investigation ◽  
Shear Strength ◽  
Sandwich Structure ◽  
Transverse Direction ◽  
High Strength ◽  
Face Sheet ◽  
Flexure Strength ◽  
Yield Load ◽  
The Relationship

In order to investigate flexure properties of high-strength corrugated composite paperboard(HCCP), applying the method of flexure property test for sandwich structure, four kinds of thickness paperboard –10,15,20 and 30mm– were tested according to longitudinal and transverse direction respectively, then the curve of flexure load – deflection was analyzed, the paper focused on the relationship between flexure yield load, flexure strength of face sheet, shear strength of core and thickness and direction of paperboard. The investigation has a strong significance for HCCP’s application in practice.

Micromechanical analysis of longitudinal and shear strength of composite laminae

2020 ◽  
Vol 54 (30) ◽  
pp. 4853-4873 ◽  
Author(s):  
Lucas L Vignoli ◽  
Marcelo A Savi ◽  
Pedro MCL Pacheco ◽  
Alexander L Kalamkarov
Keyword(s):  
Experimental Data ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Shear Strength ◽  
The Other ◽  
Closed Form Expression ◽  
Plane Shear ◽  
Longitudinal Tensile Strength ◽  
Wide Range ◽  
Micromechanical Models

The analysis of several micromechanical models for estimating strength of composite laminae is presented. Longitudinal tensile, compressive and in-plane onset shear strengths are analytically estimated and compared with experimental data available in the literature. The tensile longitudinal load predominantly induces rupture of fibers. On the other hand, the compressive strength is highly influenced by fiber misalignment, inducing a wide range of failure mechanisms. The material response to in-plane shear presents a strong nonlinear response. The estimation of longitudinal tensile strength based on the rule of mixture approaches is compared with 27 experimental data. A novel improvement is proposed assuming that in situ strength of fiber is smaller than fiber strength measured individually due to manufacturing induced damage. For the in-plane shear, 6 models are compared with 10 experimental stress-strain curves, including a novel closed-form expression based on the concentric cylinders model. Finally, for the longitudinal compressive strength, 8 micromechanical models, including a novel model to estimate misalignment effect in fiber crushing, are compared with 61 experimental data are analyzed. Results indicate that the minimal average error for the longitudinal tensile strength is 12.4% while for the compressive strength it is 15%. For the shear strength, the closest prediction depends on the strength definition and the proposed damage onset strength presents the best predictions. In general, the newly proposed models present the best estimations compared with the other models.

Organoclay Effect on Transverse Tensile Strength and In-Plane Shear Strength of Unidirectional Glass/Epoxy Nanocomposites

2007 ◽  
Vol 334-335 ◽  
pp. 773-776 ◽  
Author(s):  
Jia Lin Tsai ◽  
Ming Dao Wu
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Glass Fiber ◽  
Epoxy Compound ◽  
Epoxy Nanocomposites ◽  
Plane Shear ◽  
Plane Failure ◽  
Transverse Tensile ◽  
Transverse Tensile Strength ◽  
Mechanical Mixer

This research focuses on the fabrication of glass fiber/epoxy organoclay nanocomposites as well as on the investigation of organoclay effect on transverse tensile strength and in-plane shear strength of the nanocomposites. To demonstrate the organoclay effect, three different loadings of organoclay were dispersed respectively in the epoxy resin using a mechanical mixer followed by sonication. The corresponding glass/epoxy nanocomposites were produced by impregnating dry glass fiber with organoclay epoxy compound via a vacuum hand lay-up procedure. For evaluating transverse tensile strengths, the unidirectional coupon specimens were prepared and tested in the transverse direction. Results indicate that with the increment of organoclay loadings, the glass/epoxy nanocomposites demonstrate higher transverse tensile strength. On the other hand, the in-plane shear strengths were measured from [± 45]s laminates. It is revealed that when the organoclay loadings increase, the in-plane shear strength of glass/epoxy nanocomposites also increases appropriately. Scanning Electron Microscopy (SEM) observations on the failure surfaces indicate that the increasing characteristics in transverse and in-plane failure stresses may be ascribed to the enhanced fiber/matrix bonding modified by the organoclay.

Measurement of the shear and tensile fracture properties of leaves of pasture grasses

1996 ◽  
Vol 47 (4) ◽  
pp. 587 ◽  
Author(s):  
DA Henry ◽  
RH Macmillan ◽  
RJ Simpson
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Festuca Arundinacea ◽  
Shear Fracture ◽  
Tensile Fracture ◽  
Shear Properties ◽  
Fracture Properties ◽  
Pasture Grasses ◽  
The Relationship ◽  
Intrinsic Strength

The shear fracture properties of leaves of pasture grasses were measured using a shearing device consisting of 2 blades at fixed angles. The mechanics of the shearing process were examined with both paper and leaves of Festuca arundinacea. The investigations indicated that the intrinsic strength of the material being cut is best represented as force exerted during the cut divided by the length of the cutting blade in contact with the material. Tensile fracture properties of leaves of 5 pasture grasses were also measured, and the relationship between tensile and shear properties was examined. Intrinsic shear strength was weakly negatively correlated with tensile strength.

scholarly journals Simulation and Development of Instrumental Setup to Be Used for Cement Grouting of Sand Soil

2017 ◽  
Vol 1 (1) ◽  
pp. 16 ◽  
Author(s):  
Yaser Gamil ◽  
Ismail Bakar ◽  
Kemas Ahmed
Keyword(s):  
Experimental Investigation ◽  
Shear Strength ◽  
Sandy Soil ◽  
Construction Materials ◽  
Arab Countries ◽  
Sand Soil ◽  
Cement Grouting ◽  
Custom Made ◽  
Before And After ◽  
The Common

Most of Arab countries areas are occupied with deserts that is covered with sandy soil. Thus, it is necessary to make use of this huge volume of sand to be as construction materials. It is proven that, sand is initially uneven and unstable. It requires pre-modifications of its primer properties in order to be used as construction materials. One of the common techniques is injecting the sand with binders. Many grouting techniques has been implanted to modify or rehabilitate the structure of soil but for sandy soil the methods has not yet been introduced Therefore, this study aimed at developing simulation and instrumental setup to be used for cement grouting. The simulation has been custom made and utilized to form grouted samples for further investigation. The method of injecting sand is by applying pressure to produce force flow in order to be injected into the sand. After the formation of injected sand samples, an experimental investigation was carried out to determine the basic properties. Shear strength of the sand was recorded before and after grouting. It was found that, the shear strength has increased after injecting the sand with cement and the setup has produced accurate grouted samples with even distribution of the cement mix. The results of the various investigations conclusively proved that grouting can be used as an effective way to improve the strength characteristics significantly and can also contribute to the stabilization of sand.

Experimental Investigation of the Shear Strength of Lubricants Subjected to High Pressure and Temperature

1986 ◽  
Vol 108 (4) ◽  
pp. 571-577 ◽  
Author(s):  
E. Ho¨glund ◽  
B. Jacobson
Keyword(s):  
Experimental Investigation ◽  
High Pressure ◽  
Shear Strength ◽  
High Pressure And Temperature ◽  
Mineral Oils ◽  
Wide Range ◽  
Experimental Apparatus ◽  
Synthetic Lubricants ◽  
The Relationship ◽  
Natural And Synthetic

In order to evaluate the relationship between limiting shear strength and pressure for a lubricant an experimental apparatus has been built. Pressures up to 2.2 GPa and temperatures up to 200°C are attainable simultaneously. Thus the limiting shear strength-pressure relationship has been surveyed in a wide range. Several types of natural and synthetic lubricants have been tested. The results show that all the mineral oils tested behave in quite a similar way. Synthetic lubricants do not show this behaviour, but the relationship between limiting shear strength and pressure depends strongly upon the chemical base of the synthetic lubricants. The behaviour of grease does not differ from that of liquid lubricants. The pressures at which the lubricants change from a liquid to a solid behaviour have also been measured.

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