Towards a Novel Defect Severity Model for Compressive Failure Analysis of Unidirectional Composites
Paper in proceedings, 2019

Compressive failure of high-performance unidirectional (UD) carbon fibre polymer composites is driven by fibre kinking. Fibre kinking is known to be controlled by the shear strength of the supporting matrix material. Consequently, compressive strength is significantly reduced as the fibre waviness increases, as postulated by Argon in the 1970’s.  In this paper, additional fibre architectural features affecting the compressive strength of UD composites, and to be considered in strength analyses of UD NCF reinforced carbon fibre composites, are discussed. The current work comprises development and use of a method for characterization of fibre misalignment in CFRP. Transfer of fibre misalignment measurements into finite element models and subsequent compressive strength analyses is conducted. These analyses reveal a very strong relationship between compressive strength and fibre waviness in accordance with Argon’s model. In addition, geometrical features such as the size of zones with large fibre misalignment are also found to influence the compressive strength of the studied composites.

Author

Dennis Wilhelmsson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

R. Talreja

Texas A&M University

Renaud Gutkin

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Leif Asp

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

American Society of Composites 34th, Conference, ASC34
Atlanta, ,

Dimensioneringsmetodik för tryckbelastad NCF komposit (KOMPRESS II)

VINNOVA, 2017-11-10 -- 2019-12-31.

Areas of Advance

Transport

Materials Science

Subject Categories

Paper, Pulp and Fiber Technology

Polymer Technologies

Composite Science and Engineering

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

More information

Created

9/26/2019