نتایج جستجو برای: modified gurson model gtn
تعداد نتایج: 2310303 فیلتر نتایج به سال:
Tube spinning is an effective plastic-forming technology for forming light-weight, high-precision and high-reliability components in high-tech fields, such as aviation and aerospace. However, cracks commonly occur in tube spinning due to the complexity of stress state, which severely restricts the improvement of the forming quality and forming limit of components. In this study, a finite elemen...
The use of high strength steel (HSS) cold-formed hollow section is significant interest in the construction sector due to competitive costs. accurate simulation ductile fracture failure at micro and macro scale critical for improving validity predicting structural behaviour HSS sections welded joints. In this study, S700 material studied using Gurson-Tvergaard-Needleman (GTN) damage model. Repr...
This study aims to investigate the formability of AA2198-T3 Al-Li alloy in hydro-mechanical deep drawing (HMDD), through experimentation and finite element simulation. The effects most critical factors were studied: die cavity pressure forming temperature; temperature is selected at 298K 423K. Gurson?Tvergaard?Needleman model (GTN model) was employed analyze predict fracture hydroforming a cyli...
BACKGROUND AND PURPOSE The Efficacy of Nitric Oxide in Stroke (ENOS) trial found that transdermal glyceryl trinitrate (GTN, a nitric oxide donor) lowered blood pressure but did not improve functional outcome in patients with acute stroke. However, GTN was associated with improved outcome if patients were randomized within 6 hours of stroke onset. METHODS In this prespecified subgroup analysis...
The Gurson–Tvergaard–Needleman (GTN) damage model is widely used to predict ductile failure initiation and propagation. However, the material-dependent parameters can show a significant spread when determined for same steel grade material. Different calibration procedures optimisation processes cause variation in obtained parameter values. Furthermore, there no clear consensus on which require ...
New methods in metal forming are rapidly developing and several processes used to optimize manufacturing components reduce cost production. Single Point Incremental Forming (SPIF) is a sheet process for rapid prototyping applications small batch This work dedicated the investigation of profile geometry thickness evolution truncated pyramid. The influence parameters during SPIF also studied. A n...
This numerical investigation of an advanced Gurson–Tvergaard–Needleman(GTN) model is an extension of the original work of Ben Bettaieb et al. (2011). The model hasbeen implemented as a user-defined material model subroutine (VUMAT) in the Abaqus/explicitFE code. The current damage model extends the previous version by integrating the threedamage mechanisms: nucleation, growth an...
in this paper, a method to determine the material parameters of the lemaitre damage model from the knowledge of the gurson model parameters is proposed. as for porosity damage, the gurson model neglects the coupling of elasticity with damage, allowing to use the stress softening effect to make a link between both theories up to a fast identification procedure (based on the expressions of the yi...
Ductile failure prediction is essential to avoid loss of structural integrity or control crack propagation during forming processes. One the main difficulties complex paths. This study proposes a nonlocal extension local Gurson–Tvergaard–Needleman (GTN) ductile damage model at finite strains able capture cup–cone slant fracture. The proposed based on an implicit gradient formulation which enabl...
Ductile fracture through growth and coalescence of intergranular cavities is a failure mode observed experimentally in many metallic alloys used industrial applications. Simulation this process polycrystalline aggregates requires modeling the plastic yielding porous boundaries. However, classical yield criteria for materials such as Gurson–Tvergaard–Needleman model its current extensions cannot...
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