Failure strength and mechanism of composite laminates under multiaxial loading conditions

An experimental study of strength and failure behavior of orthotropic G-10 glass fiber reinforced composite laminates in an in-plane stress state has been conducted. Different types of biaxial specimens and associated test fixtures were developed and employed in the study. Standard IITRI specimens were used to determine tensile and compressive failure strengths of G-10 composite laminates in both fill and warp directions. Biaxial tension-compression (BTC) and biaxial compression-compression (BCC) flat coupon specimens with flexible end reinforcements were designed and tested to study failure behaviors and mechanisms of composite laminates under a biaxial tension-compression and biaxial compression-compression stress states. Tubular specimens loaded in axial tension, axial compression, torsion, internal pressure, and external pressure were employed to produce desired combinations of in-plane stresses and strains. Based on the biaxial failure envelopes obtained from the tests, notched BCC specimens (BCC(n)) were tested in a biaxial compression loading condition to study failure behavior of notched laminates under a biaxial stress state. Failure mechanisms of notched and unnotched composite laminates have been studied based on the test data and failure surface examination.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Wang, Jerry Zhiqi

Contributors dc:contributor

• Socie, Darrell F.

• Applied Mechanics
• Engineering, Mechanical

Statement dc:rights

• Copyright 1993 Wang, Jerry Zhiqi

Language dc:language

eng

Identifier

AAI9314957
(UMI)AAI9314957

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21157