Fracture toughness degradation in HY-80 and HY-100 after prestraining
Publisher: Naval Postgraduate School
Published: 1983
Place of publication: Monterey, California
Language: eng
Subjects: Mechanical engineering
Description: This thesis is the first in a series that is attempting to discover the mechanism by which the fracture toughness J sub 1C, of HY-series steel decreases with increasing prestrain at room temperature. This decrease J sub 1C is a function of yield strength and plane strain fracture strain. However, this reduction in J sub 1C is shown to be caused by a reduction in the plane strain fracture strain. Fractographic examinations have verified this reduction in the fracture strain and also have shown that regions of very low ductility exist due to alloy segregation that is present in bands. The mechanism for the degradation in the toughness is believed to be such that stress relieving following prestraining would restore the toughness.
Notes: DTIC Descriptors: Strain(Mechanics), Steel, Fracture(Mechanics), Stress Strain Relations, Tensile Strength, Microstructure, Computations, Nondestructive Testing, Degradation, Structural Properties, Tensile Properties, Modulus Of Elasticity, X Ray Diffraction, Theses, Toughness, Segregation(Metallurgy), Plastic Properties, Ductility, Yield Strength, Research Management, Equations, Structural Engineering, J Integrals

DTIC Identifiers: Steel HY-80, Steel Hy-100

Thesis (M.S. in M.E. and Degree of Mechanical E.)--Naval Postgraduate School, 1983.

Bibliography: l. 144-146.

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US Navy (USN) author.