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Updated Static Influential Factor Analysis for Unidirectional Carbon-Based Composites.

Bae Jun Kwon¹, Chan-Jung Kim²

¹Stability, DNV AS Norway, 1363 Oslo, Norway.

|September 28, 2024

Summary

A revised static load influential factor (SLIF) better quantifies how static loads affect the dynamic properties of unidirectional carbon-based composites (UCBCs). This new method accurately captures resonance frequency shifts across various fiber orientations.

Keywords:

carbon fiber orientation modal parameters modal participation factor revised static load influential factor uniaxial static load unidirectional carbon-based composite structure

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Area of Science:

Materials Science
Mechanical Engineering
Composite Materials

Background:

The dynamic properties of unidirectional carbon-based composites (UCBCs) are sensitive to fiber orientation and external static loads.
Previous methods using the static load influential factor (SLIF) had limitations in accurately assessing these effects.

Purpose of the Study:

To introduce and validate a revised SLIF for more accurately evaluating the impact of static loads on UCBC dynamic behavior.
To theoretically link the revised SLIF to modal participation factors in UCBCs.

Main Methods:

A simplified formulation for a revised SLIF was developed, considering resonance frequency shifts and the phase relationship between static load and modal response.
Dynamic behavior was analyzed across six modes (four bending, two torsional) for UCBCs with fiber orientations from 0 to 90 degrees.
The revised SLIF was compared against the original SLIF using robust and isotropic specimens under uniaxial pre-static load.

Main Results:

The revised SLIF demonstrated significant effects on dynamic properties, with resonance frequency variations under 0.16% in tested specimens.
The original SLIF yielded negligible results in certain modes due to a damping term, making it less sensitive.
The revised SLIF proved more effective in capturing the influence of static load on UCBC dynamic behavior.

Conclusions:

The revised SLIF offers a more sensitive and accurate method for analyzing the dynamic response of UCBCs under static loading conditions.
This improved factor enhances the understanding of how static loads influence the modal parameters of composite structures.