scholarly journals Effect of ply orientation angle on residual stress in carbon fibre laminates

2020 ◽  
Vol 804 ◽  
pp. 012017
Author(s):  
Nitish Bajaj ◽  
Rachit Chhabra ◽  
Rajat Sharma ◽  
Neerav Gupta ◽  
Dr Vipin
Keyword(s):  
Residual Stress ◽  
Carbon Fibre ◽  
Orientation Angle ◽  
Ply Orientation

Effect of Delamination on Natural Frequencies of E-glass and S-glass Epoxy Composite Plates

2021 ◽  
Author(s):  
P. K. Karsh ◽  
Bindi Thakkar ◽  
R. R. Kumar ◽  
Abhijeet Kumar ◽  
Sudip Dey
Keyword(s):  
Natural Frequencies ◽  
Epoxy Composite ◽  
Orientation Angle ◽  
Laminated Composite ◽  
Composite Plates ◽  
Mode Shapes ◽  
Transverse Shear Deformation ◽  
The Finite Element Method ◽  
Modes Of Failure ◽  
Ply Orientation

The delamination is one of the major modes of failure occurring in the laminated composite due to insufficient bonding between the layers. In this paper, the natural frequencies of delaminated S-glass and E-glass epoxy cantilever composite plates are presented by employing the finite element method (FEM) approach. The rotary inertia and transverse shear deformation are considered in the present study. The effect of parameters such as the location of delamination along the length, across the thickness, the percentage of delamination, and ply-orientation angle on first three natural frequencies of the cantilever plates are presented for S-glass and E-glass epoxy composites. The standard eigenvalue problem is solved to obtain the natural frequencies and corresponding mode shapes. First three mode shape of S-Glass and E-Glass epoxy laminated composites are portrayed corresponding to different ply angle of lamina.

Influence of ply angle and length on buckling behavior of composite shells under hydrostatic pressure

2019 ◽  
Vol 38 (10) ◽  
pp. 478-491 ◽  
Author(s):  
Ranfeng Wei ◽  
Guang Pan ◽  
Jun Jiang ◽  
Kechun Shen
Keyword(s):  
Hydrostatic Pressure ◽  
Orientation Angle ◽  
Element Model ◽  
Scale Model ◽  
Manufacturing Cost ◽  
Buckling Behavior ◽  
Experiment Method ◽  
Analytical Formulas ◽  
Critical Buckling Pressure ◽  
Ply Orientation

This paper is devoted to the buckling problem of the composite cylindrical shell subjected to hydrostatic pressure. Both analytical and numerical methods are applied to investigate the buckling behavior. Based on the study of analytical formulas, it is found that the composite cylindrical shells with the same length-to-diameter ratio, diameter-to-thickness ratio, and type of layup have the same buckling pressure. Thus, a scale model experiment method is then proposed, which uses the scale model to replace the full-scale model in pressure test experiment to reduce the manufacturing cost of the test specimen. The feasibility of this method is verified by numerical calculation. The influences of ply orientation angle and length of shell on buckling shape and critical buckling pressure have been investigated numerically and demonstrated by several examples. Based on the study of the influence of shell length on critical buckling pressure, a modified finite element model, which can overcome the conservatism of optimization result due to the stress concentration caused by boundary conditions, is combined with the genetic algorithm to optimize the laminations for mass reduction.

scholarly journals Microstructural Dynamics of the Myocardium: Orientation of the Muscle Fibers and Occurrence of Cardiomyopathies

2022 ◽  
Vol 2022 ◽  
pp. 1-9
Author(s):  
René Thierry Djoumessi ◽  
François Beceau Pelap
Keyword(s):  
Residual Stress ◽  
Compression Test ◽  
Muscle Fibers ◽  
Orientation Angle ◽  
Tissue Level ◽  
Heart Tissue ◽  
Congenital Diseases ◽  
Organ Level ◽  
Stress States ◽  
The Impact

This paper considers the Holzapfel–Ogden (HO) model to examine the behavior of the left ventricle myocardium. At the tissue level, we analyze the contributions of the orientation angle of muscle fibers (MFs) and investigate their effects on the occurrence of certain cardiomyopathies and congenital diseases at the organ level. Knowing the importance of myocardial microstructure on cardiac function, we vary the angle between the direction of collagen sheets and MFs in all layers of the myocardium (from epicardium to endocardium) to model the effects of tilted MFs. Based on the HO model in which the directions of the fibers are orthogonal and using the strain energy of HO, we construct a tensile-compression test and simulate the dynamics of a cubic sample. We recover the authors’ results exhibiting the existence of residual stresses in various directions. Then, we modify the energy of HO slightly to assess the impact of the same stress states on the system with tilted MFs. A numerical tensile-compression test performed on this new cubic sample shows that, in certain directions, the heart tissue is more resistant to shear deformations in some planes than in others. Moreover, it appears that the residual stress is smaller as the angle of orientation of the MFs is small. Furthermore, we observe that the residual stress is greater in the new model compared to the normal HO model. This could affect the heart muscle at the organ level leading to hypertrophied/dilated cardiomyopathy.

PC-Based Management and Analysis of X-Ray Residual Stress Data

1992 ◽  
Vol 36 ◽  
pp. 535-541 ◽  
Author(s):  
S. B. Courtney ◽  
M. J. Tricard ◽  
R. W. Hendricks
Keyword(s):  
Residual Stress ◽  
Full Width Half Maximum ◽  
Orientation Angle ◽  
Maximum Intensity ◽  
Data Set ◽  
Strain Measurements ◽  
X Ray ◽  
Software Packages ◽  
Half Maximum Intensity ◽  
Integrated Intensities

AbstractThe authors have developed two independent software packages that store x-ray peak locations, integrated intensities and full-width half-maximum intensity data as a function of diffractometer tilt and orientation angle; this information is used to compute residual stress tensor values. Each program retrieves the fitted x-ray peak locations from a dBASE-compatible data set that is independent of both x-ray diffractometer and acquisition software. Machine-specific routines have been coded to transfer peak data and general diffraction setup information from several different x-ray acquisition platforms into this common format. The two database management programs provide stand-alone storage, retrieval, analysis and graphic output of data, and thus have become practical laboratory vehicles toward establishing a standard database format for storing x-ray strain measurements and the residual stress values calculated therefrom.

scholarly journals On the reliability of residual stress measurements in unidirectional carbon fibre reinforced epoxy composites

2021 ◽  
pp. 107146
Author(s):  
A. Magnier ◽  
T. Wu ◽  
S.R. Tinkloh ◽  
T. Tröster ◽  
B. Scholtes ◽  
...  
Keyword(s):  
Residual Stress ◽  
Carbon Fibre ◽  
Epoxy Composites ◽  
Stress Measurements

Thermoplastic Stress Analysis of Graphite Reinforced Composite Cantilever Beam of Arbitrary Orientation, Subjected to Uniformly Distributed Loads

2000 ◽  
Author(s):  
Fuat Okumus ◽  
Aydin Turgut ◽  
Erol Sancaktar
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
Composite Beam ◽  
Stress Component ◽  
Orientation Angle ◽  
Thermoplastic Composite ◽  
Reinforced Composite ◽  
Stress Components ◽  
Uniformly Distributed Loads ◽  
Thermoplastic Stress

Abstract In this study, an elastic-plastic stress analysis is performed in a carbon fiber reinforced thermoplastic composite beam, which is loaded uniformly at the upper surface. An analytical solution is obtained including both the governing differential equations and boundary conditions. The composite beam is loaded uniformly at the upper surface, therefore the normal stress component σy is neglected in comparison with other stress components. The orientation angle of the composite is changed as 0°, 15°, 30° and 45°. The intensity of the residual stress component of σx is maximum at the upper and lower surfaces of the composite beam. The intensity of the residual stress component of the shear stress τxy is maximum around the central axis for the beam.

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