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Plastic limit load and its application to the fracture toughness testing for heterogeneous single edge notch tension specimens
Author(s) -
Paredes M.
Publication year - 2014
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12111
Subject(s) - limit load , fracture toughness , materials science , hardening (computing) , fracture mechanics , tension (geology) , structural engineering , enhanced data rates for gsm evolution , toughness , fracture (geology) , limit (mathematics) , strain hardening exponent , finite element method , compact tension specimen , composite material , ultimate tensile strength , computer science , crack growth resistance curve , mathematics , crack closure , engineering , mathematical analysis , telecommunications , layer (electronics)
The current investigation pursues the confirmation of the applicability of the limit load solutions in determination of the η factors necessary for fracture toughness testing protocols. The procedure begins with the correct calculation of limit load values in welded single edge notch tension (SE(T)) fracture specimens containing centreline cracks. Hence, the η factor is inferred through the principle of potential energy. Additionally, such results are compared with those obtained from finite element analyses, including strain hardening effects available in the literature. SE(T) specimens subject to pin‐loading display that the η factors are insensitive to the configurational effects and hardening properties. On the other hand, in clamped SE(T) specimens, such effects become meaningful, making its usage in fracture toughness experiments questionable. This work provides an alternative methodology to compute fully plastic proportionality coefficients ( η ) based on limit load solutions for heterogeneous cracked SE(T) specimens. These analyses also consider the limitations and potentialities of such an approach in experimental measurements of ductile crack growth.