Stress triaxialityHydrogen gas, as an energy carrier, is expected to play an important role in the storage and transport of energy produced by renewable sources. The transport of hydrogen gas can be managed through the use of existing pipeline networks. However, the uptake of hydrogen in steel ...
A single parameter, the crack tip opening displacement, is not sufficient to characterise the initiation of ductile tearing of a material in different crack tip stress triaxiality states. The value of CTOD, δi, at fracture initiation strongly depends on the in-plane constrint. The experimental ...
The influence of the stress triaxiality on void formation, void growth, and fracture was investigated for an equiaxed Ti-6A1-4V alloy. Void nucleation in the α phase was found to occur for a critical value of macroscopic plastic strain, whereas void nucleation at the α/β interface also dep...
Positive T-stress strengthens the level of crack tip stress triaxiality and leads to high crack-tip constraint while negative T-stress leads to the lost of constraint. The following facts characterize the T-stress and its effects: It should be noted that a standard specimen, such as compact ...
The influence of stress triaxiality on hydride cracking is negligible in the studied range. The influence of hydrogen on material ductility is negligible at 350 °C and 480 °C since hydrides do not crack at these temperatures. The ductility of the material increases with increasing temperature. ...
stress triaxialityhydrogen free materialsbrittle fracture processhydrogen embrittlementThis chapter contains sections titled: Introduction Material and experimental procedure Experimental results Discussion Conclusiondoi:10.1002/9781118803363.ch71J. HuezA-L. Helbert...
In this paper the hydrogen transport by diffusion in metals is modelled in notched specimens where loading generates a triaxiality stress state. To this end, two different approaches of stress-assisted hydrogen diffusion, one-dimensional (1D) and two-dimensional (2D), were compared in the vicinity...
Mechanism for SCC relates to the anodic dissolution forming the groove, where hydrogen embrittlement can set in and finally fracture happens due to triaxiality.doi:10.1007/s11665-016-2148-7Murkute, PratikRamkumar, J.Mondal, K.Springer USJournal of Materials Engineering & Performance...
Zircaloy-4 was tested at room-temperature over a range of hydrogen content between 10 and 200 ppm, and stress-states between a triaxiality of −0.23 and 0.9. Triaxiality (η) is defined as the ratio of hydrostatic stress to von Mises stress and was controlled through use of select mechanic...
Plane stress conditions are used due to near zero values for elastic strain in the radial direction (ɛɛrr) as described in [1], [3] where low levels of stress triaxiality were observed, resulting in: (9)σrr=τrθ=τrz=0,where σrr is the radial stress, and τrθ, and τ...