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Sensitivity of Compressed Composite Channel Columns to Eccentric Loading
Pawel Wysmulski1, Hubert Debski1, Katarzyna Falkowicz1
1Department of Machine Design and Mechatronics, Faculty of Mechanical Engineering, Lublin University of Technology, 36 Nadbystrzycka Street, 20-618 Lublin, Poland.
Materials (Basel, Switzerland)
|October 14, 2022
Summary
Eccentric compressive loads significantly impact carbon/epoxy laminate columns, affecting buckling modes and reducing load capacity. This research analyzes load eccentricity effects on composite structural integrity.
Area of Science:
- Materials Science
- Mechanical Engineering
- Structural Analysis
Background:
- Composite materials like carbon/epoxy are increasingly used in structural applications.
- Understanding buckling behavior under various loading conditions is crucial for structural safety.
- Thin-walled composite columns are susceptible to buckling under compression.
Purpose of the Study:
- To investigate the effect of load eccentricity on the buckling behavior of short, thin-walled carbon/epoxy laminate columns.
- To analyze how load eccentricity influences buckling modes, bifurcation loads, and critical loads.
- To validate numerical models against experimental data for accurate structural analysis.
Main Methods:
- Experimental testing of eight-ply [0/45/-45/90]s and [90/-45/45/0]s laminate columns under axial and eccentric compression.
- Finite element analysis using Abaqus® software for eigenproblem analysis and non-linear postbuckling analysis.
- Approximation methods based on experimental and numerical postbuckling equilibrium paths to determine critical loads.
Main Results:
- Load eccentricity significantly alters the buckling mode and reduces the critical load of composite columns.
- Numerical models, validated by experiments, accurately predict buckling behavior under eccentric loading.
- The study quantifies the impact of eccentricity on the postbuckling load-carrying capacity.
Conclusions:
- Compressive load eccentricity is a critical factor in the structural performance of thin-walled composite columns.
- Eccentric loading can lead to premature damage and reduced load-carrying capacity in carbon/epoxy structures.
- Accurate modeling and experimental validation are essential for predicting the behavior of composite structures under eccentric loads.
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