scholarly journals Iosipescu Shear Test of Composite Joint Specimens in Tensile Loading

1995 ◽  
Vol 4 (4) ◽  
pp. 096369359500400 ◽  
Author(s):  
Jang-Kyo Kim ◽  
Joo Hyuk Park
Keyword(s):  
Shear Stress ◽  
Stress Field ◽  
Composite Laminates ◽  
Shear Test ◽  
Pure Shear ◽  
Maximum Shear Stress ◽  
Tensile Loading ◽  
Composite Joint ◽  
Loading Method ◽  
Iosipescu Shear Test

The stress field arising in tensile loading of the Iosipescu shear test is analyzed by means of finite element method. In a parametric study on a composite laminates-adhesive joint, the tensile loading method is shown more effective in creating a pure shear stress field with negligible normal stresses in the notched area than the conventional compressive loading method, although the maximum shear stress is marginally higher for the former method than the latter.

Experimental Study on Interlaminar Shear Properties of T300/BMI Composite Laminates

2013 ◽  
Vol 718-720 ◽  
pp. 157-161
Author(s):  
Zong Hong Xie ◽  
Hai Han Liu ◽  
Jian Zhao ◽  
Jun Feng Sun ◽  
Fei Peng ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Shear Test ◽  
Failure Modes ◽  
Shear Failure ◽  
Test Method ◽  
Test Results ◽  
Shear Properties ◽  
Test Fixture ◽  
Iosipescu Shear Test ◽  
Interlaminar Shear

A modified test fixture to measure the shear properties of composite laminates was designed and manufactured based upon Iosipescu shear test method. Tests on interlaminar shear propertis of T300/BMI composite laminates were conducted according to ASTM D 5379 test standard. Interlaminar shear stress/strain curves and shear failure modes were obtained. The test results showed that the modified shear test fixture and test method were effective in measuring the shear properties of composite laminates.

scholarly journals Numerical Simulation on the Effect of Rock Joint Roughness on the Stress Field

2022 ◽  
Vol 2148 (1) ◽  
pp. 012025
Author(s):  
J Wang ◽  
J Liu ◽  
Y Q Fu
Keyword(s):  
Numerical Simulation ◽  
Shear Stress ◽  
Stress Concentration ◽  
Stress Field ◽  
Compression Test ◽  
Maximum Shear Stress ◽  
Normal Pressure ◽  
Joint Roughness ◽  
Axial Shear ◽  
Joint Plane

Abstract In view of the influence of Joint Roughness Coefficient (JRC), which is for quantitative description of the joint surface roughness, on the stress field of the rock mass, compression test and shear-compression test were simulated on models with different joint roughness. The photoelasticity technique is applied to examine the feasibility of numerical simulation. The results show that numerical simulation results are in agreement with the results of photoelastic experiments. The stress concentration area is distributed near the joint plane. Thus, the joint plane controls the shear strength of the rock. In compression test, the maximum shear stress of the model is proportional to JRC and the normal pressure. In shear-compression test, when the ratio of the axial shear to the normal pressure is small, the maximum shear stress is nonlinearly positively correlated with JRC. When the ratio of the axial shear to the normal pressure is relatively large, the relationship curve between the maximum shear stress and JRC is parabolic. When the JRC is small, as the ratio of the axial shear force to the normal pressure increases, the maximum shear stress changes abruptly, and the maximum shear stress after the mutation decreases significantly. The reason is that the upper and lower parts of the model have slipped, resulting in a redistribution of stress. In addition, when the JRC is 6 to 12, it is more likely to cause stress concentration.

The KES Shear Test for Fabrics

1997 ◽  
Vol 67 (9) ◽  
pp. 654-664 ◽  
Author(s):  
Jin-Lian Hu ◽  
Yi-Tong Zhang
Keyword(s):  
Shear Stress ◽  
Shear Modulus ◽  
Shear Deformation ◽  
Shear Test ◽  
Pure Shear ◽  
Shear Stresses ◽  
Stress Strain ◽  
Complex Deformation ◽  
Strain Relationship ◽  
Shear Tester

Many fabric mechanics researchers have reported that specimens being tested on the KES shear tester are not subjected to pure shear deformation; therefore, test results cannot lead directly to a determination of the fabric shear modulus and stress/strain relationship, particularly in the nonlinear range of stress-strain. Combined with finite element analysis, this paper presents an analytical solution for the distribution of shear stresses and strains in fabric specimens tested on the kes tester. A fabric is treated as an orthotropic sheet during the analysis, which leads to a closed-form solution for the shear modulus as a function of fabric tensile and shear moduli from the kes shear test. A modified shear stress-strain relationship can also be derived. From calculations for fabrics used here, the difference between modified and tested shear modulus values is about 25–30%. The study also suggests that although the shear modulus and curves obtained on the kes shear tester are significantly different from those under the pure shear state, the kes results can still reflect the nature of a fabric under shear deformation and are valid for general objective evaluations. The exact shear stress-strain relationship and actual shear modulus may be modified only when they are required for fabric complex deformation analysis.

Predicting the Strength of Fibrous Composites by an Orthotropic Generalization of the Maximum-Shear-Stress (Tresca) Criterion

1994 ◽  
Vol 208 (1) ◽  
pp. 9-18 ◽  
Author(s):  
L J Hart-Smith
Keyword(s):  
Shear Stress ◽  
Composite Laminates ◽  
Fibrous Composite ◽  
Maximum Shear Stress ◽  
Anisotropic Elasticity ◽  
Orthotropic Materials ◽  
Carbon Fibres ◽  
Ductile Metals ◽  
Biaxial Loads ◽  
Tresca Criterion

It is shown that the strength of fibrous composite laminates has not been well represented by the innumerable abstract mathematical theories for anisotropic elasticity. Only a fibre, a matrix, or the interface can fail; not the ‘lamina’ which is a useful concoction for establishing the elastic constants only. The classical maximum-shear-stress failure criterion for ductile metals is extended to include orthotropic materials like carbon fibres. The greatest differences with respect to past theories are found for biaxial loads, both when the load is of the same sign as well as of the opposite. A comparison with available test data is included.

Asymptotic Stress Fields for Stationary Cracks Along the Gradient in Functionally Graded Materials

2002 ◽  
Vol 69 (3) ◽  
pp. 240-243 ◽  
Author(s):  
V. Parameswaran ◽  
A. Shukla
Keyword(s):  
Shear Stress ◽  
Stress Field ◽  
Functionally Graded Materials ◽  
Maximum Shear Stress ◽  
Functionally Graded ◽  
Stress Fields ◽  
Shear Mode ◽  
Graded Materials ◽  
Opening Mode ◽  
Constant Maximum

Stress field for stationary cracks, aligned along the gradient, in functionally graded materials is obtained through an asymptotic analysis coupled with Westergaard’s stress function approach. The first six terms of the stress field are obtained for both opening mode and shear mode loading. It is observed that the structure of the terms other than r−1/2 and r0 are influenced by the nonhomogeneity. Using this stress field, contours of constant maximum shear stress are generated and the effect of nonhomogeneity on these contours is discussed.

Characteristic Fracture Assessment of a Rivet Joint for Hybrid Composite Laminates under Static and Fatigue Shear Loads

2006 ◽  
Vol 326-328 ◽  
pp. 1757-1760 ◽  
Author(s):  
Dal Woo Jung ◽  
Nak Sam Choi
Keyword(s):  
Hybrid Composite ◽  
Composite Laminates ◽  
Pure Shear ◽  
Local Stress ◽  
Cyclic Fatigue ◽  
Shear Loading ◽  
Design Parameters ◽  
Tensile Fracture ◽  
Shear Mode ◽  
Composite Joint

Fatigue fracture behavior of a hybrid composite joint with riveting was evaluated in comparison to the case of static fracture. Hybrid composite joint specimens for shear test were made with layers of carbon fiber/epoxy composite and stainless steel. Characteristic fracture behaviors of those specimens were obviously different under static and cyclic loads. Static shear loading showed the fracture of a pure shear mode, whereas cyclic fatigue-shear loading caused the local stress concentration of a tensile mode and thus brought about the tensile fracture at that site. Experimental results obtained by static and fatigue tests were considered in modifications of design parameters of the hybrid joint.

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