Stress Intensity Factors for Single-Edge-Crack Solid and Hollow Round Bars Loaded in Tension

Horstman, RT; Peters, KA; Enright, CF; Meltzer, RL; Vieth, MB; Bush, AJ

doi:10.1520/jte11230j

Cited by 32 publications

(5 citation statements)

References 3 publications

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“…Similarly, it is indicated from a comparison in Figure 12 b that the dimensionless K Ⅰ from the referred test data in Ref. [ 35 ] related to single edge crack solid and hollow round bars loaded in tension is close to the FE model with θ = 70° but slightly lower than that with θ = 60° when a / D is approaching 0.5. Therefore, both the concentrated stress analysis without crack propagation and the SIF analysis with crack propagation are considered for the subsequent sensitivity parameter analysis.…”

Section: Resultssupporting

confidence: 60%

Investigation on Flexural Fracture Behaviour of Bolted Spherical Joints with Crack Propagation in Screw Threads

Shi

Zhou²,

You

et al. 2023

Materials

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Bolted spherical joints, due to their prominent merits in installation, have been widely used in modern spatial structures. Despite significant research, there is a lack of understanding of their flexural fracture behaviour, which is important for the catastrophe prevention of the whole structure. Given the recent development to fill this knowledge gap, it is the objective of this paper to experimentally investigate the flexural bending capacity of the overall fracture section featured by a heightened neutral axis and fracture behaviour related to variable crack depth in screw threads. Accordingly, two full-scale bolted spherical joints with different bolt diameters were evaluated under three-point bending. The fracture behaviour of bolted spherical joints is first revealed with respect to typical stress distribution and fracture mode. A new theoretical flexural bending capacity expression for the fracture section with a heightened neutral axis is proposed and validated. A numerical model is then developed to estimate the stress amplification and stress intensity factors related to the crack opening (mode-I) fracture for the screw threads of these joints. The model is validated against the theoretical solutions of the thread-tooth-root model. The maximum stress of the screw thread is shown to take place at the same location as the test bolted sphere, while its magnitude can be greatly reduced with an increased thread root radius and flank angle. Finally, different design variants related to threads that have influences on the SIFs are compared, and the moderate steepness of the flank thread has been found to be efficient in reducing the joint fracture. The research findings could thus be beneficial for further improving the fracture resistance of bolted spherical joints.

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Section: Resultssupporting

confidence: 60%

Investigation on Flexural Fracture Behaviour of Bolted Spherical Joints with Crack Propagation in Screw Threads

Shi

Zhou²,

You

et al. 2023

Materials

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“…Strength can be described by the Griffith equation [ 158 ], and an equivalent fracture mechanics expression is:

where

is the strength;

is Young’s modulus,

is the surface energy of the fibre,

is the fracture toughness and

is the crack length. Y is a geometry correction factor for specimens of finite size; values for a rod with a crack can be found in [ 161 ].…”

Section: Ageing and Degradation Modelling Of Composite Microconstituentsmentioning

confidence: 99%

Modelling of Environmental Ageing of Polymers and Polymer Composites—Modular and Multiscale Methods

et al. 2022

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Service lifetimes of polymers and polymer composites are impacted by environmental ageing. The validation of new composites and their environmental durability involves costly testing programs, thus calling for more affordable and safe alternatives, and modelling is seen as such an alternative. The state-of-the-art models are systematized in this work. The review offers a comprehensive overview of the modular and multiscale modelling approaches. These approaches provide means to predict the environmental ageing and degradation of polymers and polymer composites. Furthermore, the systematization of methods and models presented herein leads to a deeper and reliable understanding of the physical and chemical principles of environmental ageing. As a result, it provides better confidence in the modelling methods for predicting the environmental durability of polymeric materials and fibre-reinforced composites.

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“…where E is the Young's modulus, γ is the surface energy of the fiber, K Ic is the fracture toughness and a is the crack length. Y is a geometry correction factor for specimens of finite size-values for a rod with a crack can be found in [7]. Y is taken to be constant for the small changes in crack length relevant for this study.…”

Section: Modeling Strength Loss Of Glass Fibers Due To the Environmentmentioning

confidence: 99%

“…P = 0 since zero stress aging is investigated here. When the cracks in the fiber are penetrated by water, the mass loss inside the crack should also be described by Equation (7). Since the radius of the glass fiber and of the crack tip of the flaw in the fiber are very different, the factor ϑ is important.…”

Section: Modeling Strength Loss Of Glass Fibers Due To the Environmentmentioning

confidence: 99%

Zero Stress Aging of Glass and Carbon Fibers in Water and Oil—Strength Reduction Explained by Dissolution Kinetics

Echtermeyer

Krauklis

Gagani

et al. 2019

Fibers

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Understanding the strength degradation of glass and carbon fibers due to exposure to liquids over time is important for structural applications. A model has been developed for glass fibers that links the strength reduction in water to the increase of the Griffith flaw size of the fibers. The speed of the increase is determined by regular chemical dissolution kinetics of glass in water. Crack growth and strength reduction can be predicted for several water temperatures and pH, based on the corresponding dissolution constants. Agreement with experimental results for the case of water at 60 °C with a pH of 5.8 is reasonably good. Carbon fibers in water and toluene and glass fibers in toluene do not chemically react with the liquid. Subsequently no strength degradation is expected and will be confirmed experimentally. All fiber strength measurements are carried out on bundles. The glass fibers are R-glass.

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Stress Intensity Factors for Single-Edge-Crack Solid and Hollow Round Bars Loaded in Tension

Cited by 32 publications

References 3 publications

Investigation on Flexural Fracture Behaviour of Bolted Spherical Joints with Crack Propagation in Screw Threads

Investigation on Flexural Fracture Behaviour of Bolted Spherical Joints with Crack Propagation in Screw Threads

Modelling of Environmental Ageing of Polymers and Polymer Composites—Modular and Multiscale Methods

Zero Stress Aging of Glass and Carbon Fibers in Water and Oil—Strength Reduction Explained by Dissolution Kinetics

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