Progressive damage in satin weave carbon/epoxy composites under quasi-static punch-shear loading

2015 ◽  
Vol 41 ◽  
pp. 82-91 ◽  
Author(s):  
Yuan Liang ◽  
Hai Wang ◽  
Costas Soutis ◽  
Tristan Lowe ◽  
Robert Cernik
Keyword(s):  
Shear Loading ◽  
Epoxy Composites ◽  
Progressive Damage

Effect of nanoclay and different impactor shapes on glass/epoxy composites subjected to quasi-static punch shear loading

2018 ◽  
Vol 4 (3) ◽  
pp. 345-357 ◽  
Author(s):  
K. Naresh ◽  
K. Rajalakshmi ◽  
A. Vasudevan ◽  
S. Senthil Kumaran ◽  
R. Velmurugan ◽  
...  
Keyword(s):  
Shear Loading ◽  
Epoxy Composites

scholarly journals Stress Analysis of Hole Orientation and Laminate Geometry Impacting on Boron/Epoxy Composites Laminates

2021 ◽  
Vol 309 ◽  
pp. 01160
Author(s):  
K.M. Alemu ◽  
O.S. Fatoba ◽  
D.K. Nageswara Rao ◽  
E.T. Akinlabi
Keyword(s):  
Analytical Solution ◽  
Residual Strength ◽  
Biaxial Loading ◽  
High Strength ◽  
Failure Criteria ◽  
Shear Loading ◽  
Epoxy Composites ◽  
Space Vehicles ◽  
Stress Concentrations ◽  
Element Analysis

Boron/epoxy laminates are used in aircraft and space vehicles for their high strength. Evaluation of stresses and residual strength of the laminate with square cutout are not analyzed in the literature. The present work is focused on studying the effect of hole orientation and laminate geometry on Boron/Epoxy composites laminates under in-plane loading. The analytical solution for stresses around holes in laminates is derived using Savins’s complex variables method to consider a multilayered plate with different hole shapes and orientations of loading. The basic equations of failure criteria available for plain laminates are derived to calculate the residual strength of the laminates with hole using the stresses obtained from the analytical solution. The derived analytical solution is validated by reproducing exactly the same results of earlier researchers even by other formulations and also by the results of finite element analysis using ANSYS. The [0/0]s laminate is not preferred due to highest stress concentrations at the corners that range between 12 to 12.45. Similarly, [45/-45]s laminate is also not preferred due to its higher values of stress concentrations which range from 9.5 to 28. The normalized stress for [0/90]s under x-axis loading is 9.6 and for y-axis loading it is 9.5 which is almost the same. Even for equi-biaxial loading, it is 8.5 and for shear loading, it is 12.45. Except for shear loading, [0/90]s laminate seems to be a better choice for a reasonable value of stress concentration for any general case loading. The analytical solution derived in the present work is the most general and unique as it can yield the stresses around any shape of hole and laminate geometry and all types of in plane loading. This solution will be able to reproduce the results of all other solutions available in the literature by different formulations.

Electro-mechanical characterization of three-dimensionally conductive graphite/epoxy composites under tensile and shear loading

2019 ◽  
Vol 15 ◽  
pp. 30-33 ◽  
Author(s):  
Riley Sherman ◽  
Vijaya Chalivendra ◽  
Asha Hall ◽  
Mulugeta Haile ◽  
Latha Nataraj ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Shear Loading ◽  
Epoxy Composites

scholarly journals Multiaxial Damage Characterization of Carbon/Epoxy Angle-Ply Laminates under Static Tension by Combining In Situ Microscopy with Acoustic Emission

2018 ◽  
Vol 8 (11) ◽  
pp. 2021 ◽  
Author(s):  
Kalliopi-Artemi Kalteremidou ◽  
Brendan Murray ◽  
Eleni Tsangouri ◽  
Dimitrios Aggelis ◽  
Danny Van Hemelrijck ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Shear Loading ◽  
Image Correlation ◽  
Epoxy Composites ◽  
Multiaxial Stress ◽  
Damage Characterization ◽  
Stress States ◽  
Angle Ply Laminates

Investigating the damage progression in carbon/epoxy composites is still a challenging task, even after years of analysis and study. Especially when multiaxial stress states occur, the development of damage is a stochastic phenomenon. In the current work, a combined nondestructive methodology is proposed in order to investigate the damage from the static tensile loading of carbon fiber reinforced epoxy composites. Flat angle-ply laminates are used to examine the influence of multiaxial stress states on the mechanical performance. In situ microscopy is combined with acoustic emission in order to qualitatively and quantitatively estimate the damage sequence in the laminates. At the same time, digital image correlation is used as a supporting tool for strain measurements and damage indications. Significant conclusions are drawn, highlighting the dominant influence of shear loading, leading to the deduction that the development of accurate damage criteria is of paramount importance. The data presented in the current manuscript is used during ongoing research as input for the damage characterization of the same material under fatigue loads.

MICROMECHANICAL FINITE ELEMENT MODELING OF UNIDIRECTIONAL COMPOSITES IN THREE DIMENSIONS: PREDICTION OF TRANSVERSE TENSILE & COMPRESSIVE, TRANSVERSE SHEAR & IN-PLANE SHEAR PROGRESSIVE DAMAGE BEHAVIOR

2021 ◽  
Author(s):  
BAZLE Z.(GAMA) HAQUE ◽  
TAM NGUYEN ◽  
ISABEL CATUGAS ◽  
DANIEL J. O’BRIEN ◽  
JOHN W. GLLESPIE, JR.
Keyword(s):  
Finite Element ◽  
Transverse Shear ◽  
Epoxy Composites ◽  
Progressive Damage ◽  
Plane Shear ◽  
Unidirectional Composites ◽  
Damage Behavior ◽  
Rate Dependent ◽  
Non Linear ◽  
Fiber Matrix

Predicting the rate-dependent non-linear progressing damage behavior of unidirectional composites from the rate dependent properties of the constituents will enable computational materials-by-design and provide the fundamental understanding of the energy dissipating damage mechanisms. In this study, micromechanical finite element models of unidirectional glass-epoxy composites have been developed with fiber volume fractions, FVF = 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, & 0.70; respectively with zero thickness fiber-matrix cohesive interfaces between the fibers and the surrounding matrix. Experimentally determined rate dependent non-linear stress-strain behavior of DER353 epoxy resin [1] (Tamrakar 2019) has been used to model the large deformation matrix behavior in conjunction with a rate dependent fiber-matrix interface traction law obtained from S-2 Glass/DER353 micro-droplet experiments & simulations [2] (Tamrakar 2019). Transverse tension, compression, in-plane shear, and transverse shear loads have been applied in predicting the progressive damage behavior of unidirectional S-2 Glass/DER353 epoxy composites.

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