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•A complex Arcan fixture for testing composite was successfully manufactured and tested in this study.•Specimens tested on 0°, 45°, and 90°. It reaches 9.13, 36.00, and 51.64 MPa and ...shear strain of 0.311, 0.153, and 0.046 με.•Loading angle of 0–150° has been exhibited. Indicating 0° as shear, 45° as tensile-shear, 90° as tensile loading.•Graphite filler percentages affected GFRP composite properties.•Graphite's biodegradability became benefit to the environment. Ideal for lightweight GFRP composite structures fillers.
A detailed understanding of the interlaminar fracture, intralaminar fracture, and translaminar fracture progression of GFRP was studied using a complex Arcan fixture. A loading angle of 0–150° was successfully tested with detailed characteristics evaluated on 0°, 45°, and 90°. The different behaviors of the specimens were recorded in shear, tensile shear, and tensile stress. At these angles, the specimens reach 9.13, 36.00, and 51.64 MPa, while reaching the shear strain of 0.311, 0.153, and 0.046 με, respectively. FEM analysis was also incorporated to obtain the fracture behavior and stress distribution in the notch. Mises stress was 9.754 MPa, close to the average of 9.519 MPa from experiments. Adding graphite filler to the composite increases the composite's shear stress but reduced shear strain. 0.5 % graphite filler became the optimal ratio by making the shear stress reach 16.94 MPa with a minimum decrease in shear strain with 0.293 με.
Corrosion is accountable for numerous malfunctions and leakages in gas pipelines. In instances of external corrosion, due to the internal pressure within the pipes, stress concentrations can occur ...around the corroded areas. These, in the presence of cavities or cracks resulting from corrosion, may amplify the risk of pipeline failure. Consequently, as the wall thickness diminishes due to corrosion, the pipeline’s ability to withstand internal pressure declines. In the case of corrosion, the pressure at which a corroded pipe might collapse is significantly lower than that of an uncorroded one. Finite element modeling of corroded pipes with a defect is conducted using the Abaqus software, taking into account the mechanical effects of internal pressure on the gas pipeline structure. Abaqus facilitates the simulation of internal pressure and predicts the behavior of the pipe under pressure conditions.
Eccentrically braced frames are commonly used as a seismic resistant system, due to the good balance of stiffness and ductility. Bolted links have been proposed in the past to allow replacing the ...damaged dissipative components following a strong earthquake. The goal of this research work is to investigate the influence of the connection type on the performance of bolted links using the Finite Element Analysis. Numerical models of links are first calibrated using past experimental tests. Modelling criteria adopted to replicate the experimental behaviour of the links highlighted in the tests are reported. The achieved results obtained regarding a flush end plate bolted link and an extended end plate bolted link with different lengths are then used as benchmark to assess the influence of the link length and type of connections adopted on the response of the links. The Finite Element Method is used to investigate alternative solutions to the tested ones. Finally, the investigated options are compared to determine the advantages and disadvantages of each solution.
In order to model brittle fracture, we have implemented a two and three dimensional phase-field method in the commercial finite element code Abaqus/Standard. The method is based on the ...rate-independent variational principle of diffuse fracture. The phase-field is a scalar variable between 0 and 1 which connects broken and unbroken regions. If its value reaches one the material is fully broken, thus both its stiffness and stress are reduced to zero. The elastic displacement and the fracture problem are decoupled and solved separately as a staggered solution.
The approach does not need predefined cracks and it can simulate curvilinear fracture paths, branching and even crack coalescence. Several examples are provided to explain the advantages and disadvantages of the method. The provided source codes and the tutorials make it easy for practicing engineers and scientists to model diffuse crack propagation in a familiar computational environment.
•Diffuse brittle crack propagation modeled with phase-field method.•Staggered, split scheme solution for elastic and phase-field problem.•Easy to use open source UEL implementation in Abaqus/Standard for practical purposes.
Composite shear walls are usually employed at the bottom of super high-rise structures to resist large axial forces, bending moments, and shear forces. A lot of investigations have been carried out ...on composite shear walls, but there are fewer comparative studies on composite shear walls with different steel layouts. In this paper, low cyclic horizontal loading tests were carried out on conventional reinforcement concrete shear walls and composite shear walls with different steel layouts (H-section steel in boundary members and the steel plate in the shear wall web, H-section steel in boundary members and the slotted steel plate in the shear wall web, evenly arranged H-shaped steel in the wall). Comparative analyses of load-carrying capacity, failure modes, and seismic performance were conducted. The effects of different steel layouts on the seismic performance of composite shear walls were investigated. Based on the tests, the finite element method is used to further analyze the influence of the shear span ratio of the shear wall and the opening rate of the built-in slotted steel plate.
•Low cyclic horizontal loading tests were carried out on conventional reinforcement concrete shear walls and composite shear walls with different steel layouts.•The effects of different steel layouts on the seismic performance of composite shear walls were investigated.•The parametric analysis of the composite shear walls with different steel layouts was conducted based on numerical simulation.
Semi-crystalline polymers is an important group of materials that is used in a vast array of products. In this study, the rate-dependent properties of high-density polyethylene (HDPE) are ...investigated, both experimentally and theoretically. Experimental compression testing of a three-dimensional HDPE structure is performed and analysed numerically by use of the finite element method. In addition, an Eulerian constitutive material model for isotropic, semi-crystalline polymers is proposed. The model is able to account for such essential phenomena as strain-rate dependence, work hardening, pressure-dependence of inelastic deformations, and damage. The proposed material model was implemented in Abaqus as a VUMAT, which is an explicit implementation. The material model was calibrated by use of uniaxial tensile tests performed on HDPE dog-bone shaped samples, and the model was further explored by applying the VUMAT implementation to the compression tests of the HDPE structure. The simulation model was able to reproduce the experimental results well, both the uniaxial tests and the compression tests. In particular, the friction present in the compression tests seems to play an important role in determining the buckling mode of the structure.
•Experiments on high-density polyethylene: compression testing of a 3D structure.•Modelling of rate-dependent inelasticity and damage of semi-crystalline polymers at finite strains using an Eulerian formulation.•Analyses of rate-dependent buckling of the 3D structure.
The phase-field model for fractures regularizes crack diffusion using a length-scale parameter. The displacement fields and the phase-field in a coupled system can be solved as either fully coupled ...“monolithic” or sequentially coupled “staggered” fields. In this paper, we employ the commercial finite-element software Abaqus to solve the monolithic and staggered phase-field models using a user-defined element (UEL) and user-defined material (UMAT/VUMAT) subroutines in two- and three-dimensions for quasi-static and dynamic fractures. We present the implementation procedures for both strategies, and make a detailed comparison using different applications. By comparing the phase-field model as a diffusive crack model and the extended finite-element method (XFEM) as a discrete crack model, we obtain good agreement. We investigate the influence of the model-regularization parameter based on experimental results. We adopt the thread-parallel execution and mutexes of Abaqus solvers.
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