Hydrogen informed Gurson model for hydrogen embrittlement simulation

Numerical study of hydrogen influence on void growth at low triaxialities considering transient effects

“…The presented numerical methodology is only a first step for hydrogen embrittlement mitigation and prognosis since void behaviour should be incorporated in damage models, e.g. Gursonbased [60], cohesive [61], or phase field models [62]. Hydrogen effects on void growth are hard to be validated with empirical results for two main reasons: (i) hydrogen transport parameters are unknown for most materials and the experimental methodology aimed at characterising trapping behaviour is still not consistent -even though permeation and TDS tests are commonly used-so binding energies and trapping densities are hard to be univocally determined.…”

Fully-coupled continuum damage model for simulation of plasticity dominated hydrogen embrittlement mechanisms

“…Hydrogen promoted void growth and coalescence was claimed in numerous experimental studies [36][37][38][39]. Furthermore, hydrogen assisted void growth has been observed in numerical studies assuming the HELP mechanism [28,35].…”

“…The uncoupled approach typically consists of three subsequent analysis steps [15,[20][21][22][23][24], and therefore fails to capture the full interaction between hydrogen concentration and stress, since the analyses are performed sequentially. The fully coupled approach of hydrogen embrittlement simulations is an improvement of the uncoupled approach and requires customised codes [25][26][27][28]. The stress and diffusion equations are simultaneously solved, resulting in a coupling between the mechanical constitutive response and the hydrogen distribution.…”

“…Despite the successful use of CZM and phase-field approaches for modelling HE, they are primarily based on the brittle HEDE mechanism. HE is also manifested through plasticity dominated fracture mechanisms such as HELP and HESIV, and continuum-based models assuming these mechanisms are lacking [17,28]. Describing damage by these mechanisms in a physically sound way calls for a micromechanics based ductile damage model, such as a Gurson-type model.…”

Development of a portable electronic device for the detection and indication of fireworks and firecrackers for security personnel

“…Hydrogen is extremely flammable in fact it has the highest rating of 4 in the flammability scale [16]. A mixture of hydrogen and air can start to ignite even with just a small spark that is invisible to a naked eye [17]. Since hydrogen is the most abundant gas in the universe it is used for industrial purposes such as in manufacturing fireworks.…”