Open Access
Behavior of surface and corner cracks subjected to tensile and bending loads in Ti-6Al-4V alloy
Royce Forman,Sambi R. Mettu +1 more
TLDR
In this paper, the behavior of part-through flaws with regard to failure under monotonic loading and their growth under fatigue loading was studied experimentally and analytically, and the results of fracture toughness data and results of life prediction using the NASA/FLAGRO program were presented.Abstract:
The behavior of part-through flaws with regard to failure under monotonic loading and their growth under fatigue loading was studied experimentally and analytically. Comparisons are made of experimental values of toughness obtained using surface and corner cracked specimens with those obtained using standard test specimens, and also experimental growth cycles were compared with numerical predictions using the NASA/FLAGRO computer program. Tests were conducted on various types of surface and corner cracks under tensile and bending loads. Room temperature lab air provided the test environment. The material used in this study was the Ti-6Al-4V alloy in the solution treated and aged (STA) and stress relieved condition. Detailed tabulation of the fracture toughness data and results of life prediction using the NASA/FLAGRO program are presented. Fatigue crack growth rates for the part-through cracked specimens are compared with a base curve fitted from the data obtained using standard specimens. The fatigue loading used in the crack growth testing was constant-amplitude sinusoidal type.read more
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The effect of manufacturing defects on the fatigue life of selective laser melted Ti-6Al-4V structures
Yanan Hu,Shengchuan Wu,Shengchuan Wu,Philip J. Withers,J. Zhang,H.Y.X. Bao,Y.N. Fu,Guozheng Kang +7 more
TL;DR: In this paper, an eXtended defect zone (XDZ) describing the propensity for local plasticity during fatigue around a defect has been shown through numerical analysis to be a good indicator of the ranking of the threat to fatigue caused by differently located manufacturing defects.
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Automated 3‐D crack growth simulation
TL;DR: In this paper, a model environment for representing the evolving 3D crack geometry and for testing various crack growth mechanics is presented, and a specific implementation of the model, called FRANC3D, is described.
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Modified NASGRO equation for physically short cracks
TL;DR: In this paper, a simple analytical model for describing the crack growth behavior for any crack length and load ratio R is presented for the QT steel 25CrMo4, the model is applied to describe the crack growing behavior for different crack lengths and load ratios between −3 and 0.5.
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Damage tolerant design of additively manufactured metallic components subjected to cyclic loading: State of the art and challenges.
Uwe Zerbst,Giovanni Bruno,Jean-Yves Buffiere,Thomas Wegener,Thomas Niendorf,Tao Wu,Xiang Zhang,Nikolai Kashaev,Giovanni Meneghetti,Nik Hrabe,Mauro Madia,Tiago Werner,Kai Hilgenberg,Martina Koukolikova,Radek Procházka,Jan Džugan,Benjamin Möller,Stefano Beretta,Alexander Evans,Rainer Wagener,Kai Schnabel +20 more
TL;DR: It is concluded that the homogenization of these fields represents the current challenge for the engineer and the materials scientist.
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Predicting fatigue crack growth rate in a welded butt joint: The role of effective R ratio in accounting for residual stress effect
Guido Servetti,Xiang Zhang +1 more
TL;DR: In this paper, a simple and efficient method is presented for predicting fatigue crack growth rate in welded butt joints, based on the superposition rule of the linear elastic fracture mechanics, welding residual stress effect is accounted for by replacing the nominal stress ratio (R ) in the empirical laws by the effective stress intensity factor ratio ( R eff ).
References
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The effect of transverse shear deformation on the bending of elastic plates
Eric Reissner,Eric Reissner +1 more
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A crack opening stress equation for fatigue crack growth
TL;DR: In this paper, a general crack opening stress equation is presented which may be used to correlate crack growth rate data for various materials and thicknesses, under constant amplitude loading, once the proper constraint factor has been determined.
Stress-intensity factor equations for cracks in three-dimensional finite bodies subjected to tension and bending loads
James C. Newman,Ivatury S. Raju +1 more
TL;DR: In this paper, the stress intensity factor equations for an embedded elliptical crack, a semielliptical surface crack and a quarter elliptical corner crack are presented for three dimensional finite element analyses of these cracks.