Accession Number:

ADA230527

Title:

Investigation of Strain Characteristics of Graphite Polyetherether Ketone Using a Nonlinear Analysis and Experimental Methods

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

• Gould, Stephen C.

Report Date:

1990-12-01

Pagination or Media Count:

108.0

Abstract:

A geometric nonlinear technique is incorporated in a current finite element program. This nonlinear program allows material nonlinearity for calculating the stresses, strains and failure of composites. The improved program uses an updated Langrangian to calculate the stresses and strains. In addition, it updates the fiber orientation due to displacement in order to calculate the updated stiffness matrix. This method is valuable for large strain values. The analytical data were compared to experimental data obtained from Graphite PolyEtherEther Ketone laminates. To obtain data two geometries were used. Digitized photographs were used to measure the angle change for large strains. JS

Descriptors:

• *STRESSES
• FIBERS
• EXPERIMENTAL DATA
• MATERIALS
• COMPOSITE MATERIALS
• LAMINATES
• MATRICES(MATHEMATICS)
• FINITE ELEMENT ANALYSIS
• STIFFNESS
• DISPLACEMENT
• FAILURE
• ORIENTATION(DIRECTION)
• GRAPHITE
• NONLINEAR SYSTEMS
• GEOMETRY
• NONLINEAR ANALYSIS
• KETONES
• ANGLES

Subject Categories:

• Organic Chemistry
• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE