A NURBS-based degenerated stiffener element for isogeometric static and buckling analysis

Hao, Peng; Wang, Yu; Tang, Hao; Feng, Shaojun; Wang, Bo

doi:10.1016/j.cma.2022.115245

Cited by 13 publications

(2 citation statements)

References 49 publications

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“…It is found that the filling of ribs is mainly determined by material accumulation and material flow direction before rollers [12]. Optimizing the design of ribs structure [13,14] and improving the thinning rate, blank thickness and feed ratio are conducive to improving the height of ribs [15]. In addition, the integral forming of aluminum alloy cylinder parts with ribs has a unique material flow behavior and heterogeneous microstructure induced by deformation gradient [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Second Phases on Composite Spinning-Extrusion Forming and Mechanical Properties of Al–Cu–Li Alloy

et al. 2023

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The aim of this work is to investigate the effect of different second phases on the composite spinning-extrusion forming and mechanical properties of Al–Cu–Li alloy. With that purpose, four kinds of second phases blanks were controlled using preheating treatment, composite spinning-extrusion forming and mechanical properties test. Then, the correlation between the second phases and mechanical properties was further analyzed using electron backscattered diffraction and transmission electron microscopy. The results indicated that different second phases of Al–Cu–Li alloy can be regulated via reasonable preheating treatment. In addition, different second phases in the blank have various influences on composite spinning-extrusion forming, microstructure and mechanical properties of cylindrical parts. Dissolving the coarse second phases particles and precipitating the Al3Zr dispersoid in the blank can effectively improve the composite spinning-extrusion forming, inhibit the abnormal growth of recrystallized grains, and significantly enhance the mechanical properties of cylindrical parts with ribs. After regulation, the average grain size of the cylindrical parts is refined from about 90 μm to about 45 μm, and the average diameter of T1 phase is refined from 107 nm to 77 nm. In addition, the ultimate tensile strength, yield strength and elongation of cylindrical parts are increased from 555 MPa to 588 MPa, 530 MPa to 564 MPa, and 9.1% to 11%, respectively.

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Section: Introductionmentioning

confidence: 99%

Effect of the Second Phases on Composite Spinning-Extrusion Forming and Mechanical Properties of Al–Cu–Li Alloy

et al. 2023

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“…The advent of IGA has initiated a number of researches in the field of shell buckling, where the property of accurate geometry representation is advantageously exploited. These researches can be classified into two categories: static buckling analysis 15,[45][46][47][48][49][50][51][52][53] and dynamic buckling analysis. [54][55][56][57] In linear static buckling analysis, the superior accuracy of IGA in terms of buckling loads and mode shapes has been frequently observed.…”

Section: Introductionmentioning

confidence: 99%

Implicit dynamic buckling analysis of thin‐shell isogeometric structures considering geometric imperfections

Guo

Pan

Wei

et al. 2022

Numerical Meth Engineering

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In continuation of our previous work on nonlinear stability analysis of trimmed isogeometric thin shells, this contribution is an extension to dynamic buckling analyses for predicting reliably complex snap‐through and mode‐jumping behavior. Specifically, a modified generalized‐α$$ \alpha $$ time integration scheme is used and combined with a nonlinear isogeometric Kirchhoff–Love shell element to provide second‐order accuracy while introducing controllable high‐frequency dissipation. In addition, a weak enforcement of essential boundary conditions based on a penalty approach is considered with a particular focus on the inhomogeneous case of imposed prescribed displacements. Moreover, we propose a least‐squares B‐spline surface fitting approach and corresponding error measures to model both eigenmode based and measured geometric imperfections. The imperfect geometries thus obtained can be naturally integrated into the framework of isogeometric nonlinear dynamic shell analysis. Based on this idea, the different modeling methods and the influence of the appropriately considered geometric imperfections on the dynamic buckling behavior can be investigated systematically. Both perfect and geometrically imperfect shell models are considered to assess the performance of the proposed method. We compare our method with established developments in this field and demonstrate superior achievements with regard to solution quality and robustness.

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An isogeometric design-analysis-optimization workflow of stiffened thin-walled structures via multilevel NURBS-based free-form deformations (MNFFD)

Hao

Wang

Jin

et al. 2023

Computer Methods in Applied Mechanics and Engineering

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A NURBS-based degenerated stiffener element for isogeometric static and buckling analysis

Cited by 13 publications

References 49 publications

Effect of the Second Phases on Composite Spinning-Extrusion Forming and Mechanical Properties of Al–Cu–Li Alloy

Effect of the Second Phases on Composite Spinning-Extrusion Forming and Mechanical Properties of Al–Cu–Li Alloy

Implicit dynamic buckling analysis of thin‐shell isogeometric structures considering geometric imperfections

An isogeometric design-analysis-optimization workflow of stiffened thin-walled structures via multilevel NURBS-based free-form deformations (MNFFD)

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