Failure Mechanisms of Notched Laminates Under Biaxial Compression at Elevated Temperature

2000 ◽  
Author(s):  
Junghyun Ahn ◽  
Anthony M. Waas
Keyword(s):  
Elevated Temperature ◽  
Failure Mechanisms ◽  
Compressive Loading ◽  
Stress Raiser ◽  
Laminated Composite ◽  
Composite Plates ◽  
Biaxial Compression ◽  
Laminated Composite Plates ◽  
Final Failure ◽  
Circular Cutout

Abstract A compression test at elevated temperature was performed to investigate the notch sensitivity and failure mechanisms of fibrous laminated composite plates containing a stress raiser, in the form of a circular cutout, under equi-biaxial and uniaxial compressive loading. Strains measured at various locations on the specimen surface and cutout edge were used to monitor the initiation of failure. Unloading the specimen before global failure made it possible to understand the failure mechanism associated with the final failure mode.

Failure Mechanisms of Composite Plates With a Circular Hole Under Remote Biaxial Planar Compressive Loads

1997 ◽  
Vol 119 (1) ◽  
pp. 56-64 ◽  
Author(s):  
A. R. Khamseh ◽  
A. M. Waas
Keyword(s):  
Failure Mechanisms ◽  
Compressive Loading ◽  
Infinite Plate ◽  
Laminated Composite ◽  
Composite Plates ◽  
Laminated Composite Plates ◽  
Biaxial Tests ◽  
Compressive Loads ◽  
Stress Raisers ◽  
Plate Width

We report the results of an experimental investigation carried out for the analysis of failure mechanisms in fibrous laminated composite plates containing stress raisers, in the form of circular cutouts, under static biaxial planar compressive loading (i.e., compression in the two inplane orthogonal directions). A series of biaxial tests were carried out with 48 ply graphite/epoxy composites of varying fiber orientation. In all cases, the hole diameter to plate width aspect ratio remained in a range suitable for infinite plate assumptions. Fiber microbuckling, fiber kink banding, and fiber/matrix debonding are identified as the dominant failure mechanisms.

scholarly journals Optimization of Laminated Composite Plates for Maximum Biaxial Buckling Load

2020 ◽  
Vol 36 (2) ◽  
Author(s):  
Pham Dinh Nguyen ◽  
Quang-Viet Vu ◽  
George Papazafeiropoulos ◽  
Hoang Thi Thiem ◽  
Pham Minh Vuong ◽  
...  
Keyword(s):  
Fiber Orientation ◽  
Orientation Angle ◽  
Laminated Composite ◽  
Optimization Procedure ◽  
Composite Plates ◽  
Buckling Load ◽  
Biaxial Compression ◽  
Laminated Composite Plates ◽  
Design Variables ◽  
Fiber Orientation Angle

This paper proposes an optimization procedure for maximization of the biaxial buckling load of laminated composite plates using the gradient-based interior-point optimization algorithm. The fiber orientation angle and the thickness of each lamina are considered as continuous design variables of the problem. The effect of the number of layers, fiber orientation angles, thickness and length to thickness ratios on the buckling load of the laminated composite plates under biaxial compression is investigated. The effectiveness of the optimization procedure in this study is compared with previous works.

scholarly journals Elasto Buckling Behaviour Of Gfrp Laminated Plate With Central Holes

2011 ◽  
pp. 73-76
Author(s):  
Ganesan. C ◽  
P.K. Dash
Keyword(s):  
Laminated Composite ◽  
Composite Plates ◽  
Buckling Load ◽  
Laminated Plate ◽  
Laminated Composite Plates ◽  
Perforated Plates ◽  
The Past ◽  
Plate Elements ◽  
Circular Cutout ◽  
Two Sides

In various cases, it is roughly unavoidable to have holes in the plate elements for inspection, maintenance, and service purposes. In such cases, the presence of these holes redistributes the membrane stresses in the plates and may reduce their stability significantly. The buckling of such perforated plates has received the attention of many researchers over the past years. This paper deals with the buckling analysis of symmetrically and laminated composite plates under two sides simply supported and two sides free boundary condition. The effects on buckling load by various cut out shapes (circular, square and elliptical) and sizes are investigated. It was observed that the plate with the circular cutout yielded the greatest critical buckling load when compared with the square and elliptical cutouts.

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