Failure strength and mechanism of composite laminates under multiaxial loading conditions
Wang, Jerry Zhiqi
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https://hdl.handle.net/2142/21157
Description
Title
Failure strength and mechanism of composite laminates under multiaxial loading conditions
Author(s)
Wang, Jerry Zhiqi
Issue Date
1993
Doctoral Committee Chair(s)
Socie, Darrell F.
Department of Study
Mechanical Science and Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Applied Mechanics
Engineering, Mechanical
Language
eng
Abstract
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.
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