Computers and Structures

A typical manufacturing failure in powder bed additive manufacturing (AM) is caused by the collision between the already printed structure and the powder recoater due to large thermal deformation. This paper presents a density-based topology ...

• Concurrent topology optimization approach to design the parts and their supports.
• Additive manufacturing process simulation model based on inherent strain method.
• New thermal deformation constraint to avoid recoater collision.

• A modified stain energy release rate method is proposed to enable the method for solid element.
• An algorithm is proposed to map the crack information obtained by vision method in the FE model.
• The effectiveness and generality of ...

Vision inspection information of damages in civil engineering structures is hard to be transformed into an analysis-available resistance model to conduct in-service condition assessment. This paper proposes an updating crack-embedded finite ...

• An efficient method for seismic fragility of shear walls is developed.
• The proposed method uses sequential Bayesian inference with a binary analysis chain.
• The truncation strategy of analysis is combined with the proposed method.

The seismic performance of shear walls in nuclear power plants is critical because a failure of such structures can cause severe accidents. Thus, research on the seismic fragility of shear walls in nuclear power plants has been attempted. However,...

• A variable stiffness optimization (VSO) algorithm is proposed for VAT plates.
• The concept of tailoring stiffness through-thickness direction is introduced.
• Curvature and divergence constraints for VAT plates have been taken into ...

A novel variable stiffness optimization (VSO) algorithm is proposed accounting for the inherent mechanical characteristics of variable angle tow (VAT) plates. Through sampling in the design space of lamination parameters (LPs), a good initial ...

This work aims to predict the mechanical stress on the structure of a business jet in service phase from flight instrument only. A significant database obtained from test flights using aircraft instrumented with strain gauges has been provided as ...

• Virtual sensor of aircraft structural stress is learned from test flights data.
• A proof of concept has been developed in the context of a data science challenge.
• An ensemble model with two stacked regressors is used for time series ...

This publication presents a novel numerical avenue for the assessment of masonry structures. To circumvent the labor-intensive finite element method modeling and pre-processing step, the isogeometric analysis is enhanced within this contribution ...

• Advancing the isogeometric analysis to cope with shell-based masonry structures.
• Proposing a damage model in the context of the isogeometric analysis.
• Newly proposed element length regularization technique for NURBS.
• ...

This paper presents a novel derivation of the direct parametrisation method for invariant manifolds able to build simulation-free reduced-order models for nonlinear piezoelectric structures, with a particular emphasis on applications to Micro ...

• Model order reduction for structures with geometric and piezoelectric nonlinearity.
• Direct computation of the invariant manifold from finite element problem.
• Efficient technique accounting for electrostrictive response of the ...

• Presents a new topology optimization framework for material extrusion AM.
• Captures both discrete nozzle size and weakness of adjacent bead bonds.
• Design solution includes the structure and a trace for the raster path.
• Path ...

Topology optimization (TO) is a powerful design tool that has been used to design lightweight high-performing structures. Additive manufacturing (AM) is a favoured fabrication method for TO designs because of its high precision and flexibility to ...

The micron resolutions that 3D printers are reaching allow for a change of paradigm in the design of components, optimizing not only the topology of the component, but also the microstructure of the material, which can adopt different objectives ...

• We present a new Topology Optimization (TO) approach capable to be used in the design of functionally graded metamaterials.
• The method proposed is capable to optimize the structure by defining a Young moduli distribution across the ...

• New formulation to design structures that react to loads through shape morphing.
• Target shapes and element dimensions obtained via gradient-based optimization.
• Formulation of derivatives of objective and constraint functions.
• ...

This paper gives a new formulation to synthesize load-responsive structures through shape morphing. The design method is based on the minimization of the whole-life energy, which comprises an embodied share in the material and an operational ...

• Intervals can be used for uncertainty modeling in structural mechanics and providing meaningful results.
• Overestimation due to interval dependency can be reduced.
• Interval Finite Element Method can provide sharp and guaranteed ...

The Interval Finite Element Method (IFEM) can be used for the analysis of structures with uncertainties in load, geometry, and material. However, a naïve application of IFEM leads to meaningless overestimated enclosures due to interval ...

The contribution at hand presents a method for the application of Recurrent neural network based constitutive models within a coupled field Finite Element Analysis. Thereby, an additional scalar field is coupled to the displacement field and ...

• Proof of concept for neural network constitutive models in coupled field simulation.
• Possibility to approximate arbitrary inelastic constitutive behavior.
• Application for softening material behavior within Finite Element ...

This paper is the first one to develop a graphics process unit-based computational framework to accelerate impact failure simulations of automotive coatings, which require a considerable computational cost. Such an efficient computational ...

• Novel graphics processing unit-based framework for polymer coating impact failure.
• Parallel discontinuous Galerkin/cohesive zone model for large deformation debonding.
• Parallel contact algorithm designed for interfacial ...

This study proposes a new assembly method to address the problems of using the conventional direct assembly method for assembling elemental damping matrices for a global damping matrix. These problems include the challenges in calibrating an ...

• Address problems of direct assembly method for elemental damping.
• Propose new and consistent assembly method for elemental damping.
• Maintain consistent elemental and global structural damping ratio.
• Maintain minimal coupling ...

• An integrated section is proposed to enable single section in modelling composite slabs.
• The integrated section model is formulated with rigorous theoretical base to correctly distribute deformation components.
• The implicit state ...

Modelling slabs is vitally necessary when simulating building structures in fire. The composite action between slabs and beams and tensile membrane action after fire induced deflections significantly reshape the load redistribution mechanisms and ...

In this paper, the statistical finite element method is developed further to synthesize distributed rail response data with nonlinear finite element model predictions within and outside the measured loading range. In the data-generating model of ...

• Statistical finite element method enables integration of nonlinear model and sensor data.
• Model selection/misspecification & data uncertainty incorporated using Bayesian formalism.
• A polynomial chaos expansion is utilized to derive ...

• The key factors influencing flexoelectric enhancement in piezocomposites have been explored, with the main focus given to lead-free piezoelectric composite materials.
• Using an advanced electro-elastic model that incorporates ...

Flexoelectricity is the generation of electric fields through strain gradients. It offers unconventional ways to enhance the electromechanical coupling response of piezoelectric materials and composites compared to the conventional ...

• Propose a smart component model replacement (SCMR) approach to simulate large-scale nonlinear structure.
• The SCMR approach can finely simulate the local damage and failure mechanism in structures.
• Present “replacement” strategies ...

This paper proposes a novel smart component model replacement (SCMR) approach that is not only efficient for large-scale nonlinear structural analysis, but also accurate in the refined simulation of components of interest. The method creates a FE ...

• A new method for structural morphogenesis based on space mapping is developed.
• A separate but related module is used for form evolution and structural analysis.
• Smooth form generated with performance isosurface at the global-...

This paper presented a novel computational morphogenesis method based on space mapping that employed isosurfaces to generate three-dimensional free-form continuum structures from design domains of arbitrary complexity. To achieve the interaction ...

We consider optimization problem formulations for finding the worst compliance of a structure subject to uncertain loading. Typically, there is a least some data available on the direction and magnitude of the loading, and we therefore consider a ...

• Worst-case load uncertainty with multiple independently constrained loads.
• Three versions of the worst compliance problem formulated and compared.
• Inhomogeneous eigenvalue formulation with numerical indication of global optimality.

• Proposed a novel machine learning approach based on Graph Neural Networks (GNN) for dynamic response simulation of structures subjected to dynamics loads.
• The proposed GNN can simulate full-field spatiotemporal dynamics, generating ...

Prediction of structural responses is essential for the analysis of structural behaviour subjected to dynamic loads. Existing approaches are limited in different ways. Experimental tests are expensive due to the requirement of intensive labour ...

• A machine learning framework for first-passage reliability assessment based on PINN is established.
• The proposed method makes full use of the physical properties and sample information of the practical problems.
• Physical problems ...

The first-passage failure of structural dynamic systems is a typical failure mode in engineering. Most of the existing methods use ordinary or partial differential equations (ODEs/PDEs) to describe the dynamic systems, and transform the first-...

Mechanically induced martensitic transformations are an essential mechanism influencing the constitutive behaviour of many advanced steel grades, such as austenitic stainless steels and Transformation Induced Plasticity (TRIP) alloys. In this ...

• A novel multi-scale physically based constitutive model is formulated.
• Includes crystallographic slip after transformation from retained austenite.
• A fully implicit and consistently linearised formulation is derived in detail.
• ...

• The free vibration analysis of thin plates with side cracks is conducted.
• The first ten frequency parameters for several typical examples are obtained.
• Fewer degrees of freedom are needed in the present approach.
• Merits of weak ...

The weak form quadrature element method is applied to vibration analysis of thin plates with side cracks. Eigenfunctions are introduced into the inner square domain around the crack tip, while the rest of the problem domain is analyzed by the ...

• Improved Machine-Learning (ML) techniques were used to predict Maximum Interstory Drift Ratio (IDRmax) and Residual Interstory Drift Ratio (RIDR) of 384 Special Moment-Resisting Frames (SMRFs) considering Soil-Structure Interaction (SSI).

Nowadays, due to improvements in seismic codes and computational devices, retrofitting buildings is an important topic, in which, permanent deformation of buildings, known as Residual Interstory Drift Ratio (RIDR), plays a crucial role. To ...

Point-cloud-based geometry acquisition techniques have seen an increased deployment in recent years and can be used in many branches of science and engineering. Different from conventional computer aided design (CAD) models, point-cloud data can ...

• Point cloud-based direct structural analysis of geometrically complex domains.
• Automatic mesh generation (i.e., no user intervention) from point cloud models.
• Highly efficient pre-computation technique based on octree ...

• A multi-scale beam model is derived using FE2 framework and absolute nodal coordinate formulation.
• It has both the efficiency of absolute nodal coordinate formulation and multi-scale framework.
• Performance of the proposed method is ...

In this paper, a multi-scale modeling approach for the dynamic response of flexible multibody system made of composite material is suggested using the absolute nodal coordinate formulation (ANCF) – multilevel finite element (FE²) method. On many ...

• A TO method is proposed considering geometrical and load nonlinearities.
• The external work (objective) contains intermediate information of deformation.
• The linear FEM and traction results are compared with pressure results.

The pressure loads are always perpendicular to the deformed surface. Under the large deformation, the pressure loads will lead to load nonlinearity because of the direction change. This paper proposes a topology optimization method considering ...