Effect of Weld Strength Mismatch on Elastic-Plastic Fracture Parameters
Kirk, Mark Todd
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https://hdl.handle.net/2142/72192
Description
Title
Effect of Weld Strength Mismatch on Elastic-Plastic Fracture Parameters
Author(s)
Kirk, Mark Todd
Issue Date
1992
Doctoral Committee Chair(s)
Dodds, R.,
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Engineering, Mechanical
Abstract
This study quantifies the effect of weld strength mismatch on applied J, applied CTOD, and crack-tip constraint for both remote tensile and bending loads. Very detailed elastic-plastic finite element models for a wide range of geometrical configurations and material properties provide the fundamental quantities needed to derive fracture mechanics parameters. Equations in existing fracture test standards which relate J (and CTOD) to measurable quantities (i.e. load, plastic work, plastic displacement) are investigated for single edge notch bend, SE(B), specimens to ascertain if modifications are required for mismatched weldments. This study also addresses mismatch effects on equations which relate J (and CTOD) for small cracks in tension to nominal applied loads. Equations of this type are used to assess the integrity of structures against fracture. The interaction of weld strength mismatch and of finite specimen size effects on fracture toughness is quantified using the micromechanics approach developed by Dodds and Anderson for cleavage fracture. These investigations extend significantly the current understanding of strength mismatch effects on weldment fracture. Moreover, procedures are developed which enable accurate estimation of fracture driving force in both SE(B) specimens and tension loaded structures.
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