Validation of a Computational Approach to Predict Bursting Pressure of Scored Steel Plates

Abstract

Bursting pressure is a key parameter to optimize the performance of shock wave experimental devices or to guarantee the proper activation of overpressure safety devices. This paper provides the experimental results of scored circular thin steel plates brought to collapse by an increase in applied pressure. A finite element approach is adopted to predict the bursting pressure: detailed description of the numerical model choices and the effectiveness of simulating the nonlinear response are also given. The reliability of the proposed model in predicting the experimental response is evaluated through the comparison of global and local indicators under blind prediction conditions. A numerical parametric study is carried out to better understand the diaphragm deformation mechanics and the influence of the main parameters on the diaphragms burst pressure

Development of material strength and failure models for structural simulation of metallic shock tube diaphragms

“…The study by Colombo et al aimed to create FE simulations that replicated the measured rupture pressure of scored S235 JR structural steel plates during quasi-static experiments [14]. Their study used a novel pressure chamber (Figure 2.6) instead of a piston-driven driver tube found in shock tunnels to investigate the plasticity and tearing of the diaphragm as rupture initiates [14].…”

“…Their study used a novel pressure chamber (Figure 2.6) instead of a piston-driven driver tube found in shock tunnels to investigate the plasticity and tearing of the diaphragm as rupture initiates [14]. Results from experiments were collected with pressure transducers and an array of strain gauges to produce experimental data that could be compared to simulated results.…”

“…Simulations were performed using ABAQUS Explicit 6.7 on a quarter model of the diaphragm and the material was modelled as homogenous with material properties collected from tensile tests. J2 plasticity was used to model the plastic deformation and a Fischer failure model was used to initiate element failure [14].…”

“…J2 plasticity by itself does not consider any strain hardening effects and it is not clear if the stress-strain curves produced from the tensile tests of the diaphragm material performed by Colombo et al have been used to introduce strain hardening effects to the model [14]. The Fischer failure model is shown in Equation 4, this model considers failure in a finite element to occur if the local plastic strain exceeds the given failure strain.…”

“…The Fischer failure model is shown in Equation 4, this model considers failure in a finite element to occur if the local plastic strain exceeds the given failure strain. Here failure strain is only a function of stress triaxiality (discussed in Section 3.3.1) and the material parameter 0 is given a value from literature, not an experimentally derived value [14]. Not including strain rate dependency in the plasticity or failure models is valid for the pre-rupture deformation as the diaphragm is effectively loaded statically however, the crack growth and petal opening occurs rapidly and the models would not accurately capture this.…”