Title page for ETD etd-11142012-040258


Type of Document Master's Thesis
Author Derian, Edward J.
URN etd-11142012-040258
Title Large deformation dynamic bending of composite beams
Degree Master of Science
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Hyer, Michael W. Committee Chair
Herakovich, Carl T. Committee Member
Johnson, Eric R. Committee Member
Keywords
  • Buckling (Mechanics)
Date of Defense 1985-07-05
Availability restricted
Abstract

The large deformation response of composite beams subjected to a

dynamic axial load was studied. The beams were loaded with a moderate

amount of eccentricity to promote bending. The study' was primarily

experimental but some finite element results were obtained. Both the

deformation and the failure of the beams were of interest. The static

response of the beams was also studied in order to determine the

difference between the static and dynamic failure. Twelve different

laminate types were tested. The beams tested were 23 in. by 2 in. and

generally 30 plies thick. The beams were loaded dynamically with a

gravity-driven impactor traveling at 19.6 ft./sec. and quasi-static

tests were done on identical beams in a displacement controlled

manner. For laminates of practical interest, the failure modes under

static and dynamic loadings were identical. Failure in most of the

laminate types occurred in a single event involving 40% to 50% of the

plies. However, failure in laminates with 30° or 15° off axis plies

-occurred in several events. All laminates exhibited bimodular

properties. The compressive flexural moduli in some laminates was

measured to be 1/2 the tensile flexural modulus. No simple relationship

could be found among the measured ultimate failure strains of the

different laminate types. Using empirically determined flexural

properties, a finite element analysis was reasonably accurate in

predicting the static and dynamic deformation response.

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