scholarly journals A Three-Dimensional Ply Failure Model for Composite Structures

2009 ◽  
Vol 2009 ◽  
pp. 1-22 ◽  
Author(s):  
Maurício V. Donadon ◽  
Sérgio Frascino M. de Almeida ◽  
Mariano A. Arbelo ◽  
Alfredo R. de Faria
Keyword(s):  
Composite Structures ◽  
Damage Mechanics ◽  
Three Dimensional ◽  
Material Model ◽  
Constitutive Law ◽  
Failure Model ◽  
Strain Rate Effects ◽  
Failure Initiation ◽  
Numerical Predictions ◽  
Failure Propagation

A fully 3D failure model to predict damage in composite structures subjected to multiaxial loading is presented in this paper. The formulation incorporates shear nonlinearities effects, irreversible strains, damage and strain rate effects by using a viscoplastic damageable constitutive law. The proposed formulation enables the prediction of failure initiation and failure propagation by combining stress-based, damage mechanics and fracture mechanics approaches within an unified energy based context. An objectivity algorithm has been embedded into the formulation to avoid problems associated with strain localization and mesh dependence. The proposed model has been implemented into ABAQUS/Explicit FE code within brick elements as a userdefined material model. Numerical predictions for standard uniaxial tests at element and coupon levels are presented and discussed.

A Study on Process-Induced Warpage of Curing Mold of Composite Structures

2009 ◽  
Vol 79-82 ◽  
pp. 1173-1176
Author(s):  
Guang Quan Yue ◽  
Bo Ming Zhang ◽  
Shan Yi Du ◽  
Fu Hong Dai ◽  
Cheng Zhang ◽  
...  
Keyword(s):  
Thermal Load ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Coupling Problem ◽  
Dimensional Precision ◽  
Numerical Predictions ◽  
Dimensional Finite Element ◽  
Thermosetting Composite ◽  
Three Dimensional Finite Element

Framed curing mold is subjected to an uneven thermal load, gravity force and the pressures from composite parts and auxiliary tools during autoclave processing of thermosetting composite structures. And those loads induce the warpage of framed-mold. The warpage of framed-mold during autoclave processing influences dimensional precision of composite parts. In the present work, a three-dimensional finite element model for prediction of the warpage of framed-mold during autoclave processing has been developed. This model solved the coupling problem between the deformation and the temperature distribution of framed-mold and allows analysis of all major identified deformation influencing factors. And numerical predictions compare quite well with experimental measurements. A parametric study was performed using FEM program to examine the effect of varying the thickness of framed-mold, the shape and the dimension of mold vents.

Evaluations of failure initiation criteria for predicting damages of composite structures under crushing loading

2018 ◽  
Vol 37 (21) ◽  
pp. 1279-1303 ◽  
Author(s):  
Hongyong Jiang ◽  
Yiru Ren ◽  
Zhihui Liu ◽  
Songjun Zhang ◽  
Xiaoqing Wang
Keyword(s):  
Composite Structures ◽  
Maximum Stress ◽  
Failure Modes ◽  
Damage Model ◽  
Axial Loading ◽  
Failure Criteria ◽  
Quantitative Relation ◽  
Stress Criterion ◽  
Failure Initiation ◽  
Numerical Predictions

The crushing behaviors of thin-walled composite structures subjected to quasi-static axial loading are comparatively evaluated using four different failure initiation criteria. Both available crushing tests of composite corrugated plate and square tube are used to validate the stiffness degradation-based damage model with the Maximum-stress criterion. Comparatively, Hashin, Maximum-stress, Stress-based Linde, and Modified criteria are respectively implemented in the damage model to predict crush behaviors of corrugated plate and square tube. To develop failure criteria, effects of shear coefficients and exponents in the Modified and Maximum-stress criteria on damage mechanisms of corrugated plate are discussed. Results show that numerical predictions successfully capture both of experimental failure modes and load–displacement responses. The Modified criterion and particularly Maximum-stress criterion are found to be more appropriate for present crush models of corrugated plate and square tube. When increasing the failure index, the crushing load is decreased, which also causes premature material failure. The shear coefficient and exponents have dramatic influence on the crushing load. Overall, an insight into the quantitative relation of failure initiation is obtained.

Three-Dimensional Layout Design of Steel-Concrete Composite Structures Using Topology Optimization

2011 ◽  
Vol 308-310 ◽  
pp. 886-889 ◽  
Author(s):  
Yang Jun Luo ◽  
Xiao Xiang Wu ◽  
Alex Li
Keyword(s):  
Topology Optimization ◽  
Composite Structures ◽  
Three Dimensional ◽  
Material Model ◽  
Structural Topology ◽  
Numerical Result ◽  
Gradient Based ◽  
Optimization Methodology ◽  
Optimal Material ◽  
Displacement Constraints

For generating a more reasonable initial layout configuration, a three-dimensional topology optimization methodology of the steel-concrete composite structure is presented. Following Solid Isotropic Material with Penalization (SIMP) approach, an artificial material model with penalization for elastic constants is assumed and elemental density variables are used for describing the structural layout. The considered problem is thus formulated as to find the optimal material density distribution that minimizes the material volume under specified displacement constraints. By using the adjoint variable method for the sensitivity analysis, the optimization problem is efficiently solved by the gradient-based optimization algorithm. Numerical result shows that the proposed topology approach presented a novel structural topology of the simply-supported steel-concrete composite beam.

scholarly journals On the Calibration of a Numerical Model for Concrete-to-Concrete Interface

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7204
Author(s):  
Sławomir Dudziak ◽  
Wioletta Jackiewicz-Rek ◽  
Zofia Kozyra
Keyword(s):  
Composite Structures ◽  
Numerical Models ◽  
Material Model ◽  
Test Methods ◽  
Constitutive Law ◽  
Pilot Studies ◽  
Three Point Bending ◽  
The Mean ◽  
Abaqus Code ◽  
Slant Shear

The study was devoted to the numerical modelling of concrete-to-concrete interfaces. Such an interface can be found in many modern composite structures, so proper characterisation of its behaviour is of great importance. A strategy for calibration of a model based on cohesive finite elements and the elastic-damage traction–separation constitutive law available by default in the Abaqus code was proposed. Moreover, the default interface material model was enhanced with the user-field-variables subroutine to include a real strength envelope for such interfaces. Afterwards, the modelling approach was validated with numerical simulation of the most popular tests for determining the strength characteristics of concrete-to-concrete interfaces: three-point bending beam with a notch, splitting bi-material cubic specimens, and slant-shear tests. The results of own pilot studies were used as well as those reported by other researchers. The performed simulations proved the accuracy of the proposed modelling strategy (the mean ratio of ultimate forces obtained with numerical models and from experiments was equal to 1.01). Furthermore, the presented examples allowed us to better understand the basic test methods for concrete interfaces and the observed mechanisms of failure during them.

Three-Dimensional Nonlinear Modeling of Rubber Bushing Subjected to Complex Loading

2003 ◽  
Author(s):  
Wing Cheng
Keyword(s):  
Large Strain ◽  
Nonlinear Modeling ◽  
Three Dimensional ◽  
Complex Loading ◽  
Material Model ◽  
Failure Initiation ◽  
Military Vehicles ◽  
Rubber Bushing ◽  
Hyper Elastic ◽  
Finite Element Procedure

A finite element procedure was used to analyze rubber components on track links of military vehicles for improving their life. The procedure includes consideration of material nonlinearity with the use of a hyper-elastic material model, geometric nonlinearities utilizing surface-to-surface contact interface, large deformation and large strain nonlinear solutions. The procedure was validated with available experimental data. Very good correlation was obtained. The procedure was then applied to analyze a two-lobe rubber bushing using a 3-D model and applying a complex loading sequence including installation of the bushing onto the track links, operative loading of a combined steady-state vertical and torsional load. Results provided detailed insight to the deformation and locations of highly stressed areas at which failure initiation and limiting life might occur.

Simulation and experiment on the effect of patch shape on adhesive repair of composite structures

2019 ◽  
Vol 53 (28-30) ◽  
pp. 4125-4135 ◽  
Author(s):  
Cheng Li ◽  
Qiaoli Zhao ◽  
Junjun Yuan ◽  
Yuliang Hou ◽  
Ying Tie
Keyword(s):  
Composite Structures ◽  
Adhesive Bonding ◽  
Three Dimensional ◽  
Patch Repair ◽  
Patch Shape ◽  
Bonding Structure ◽  
Numerical Predictions ◽  
Final Failure ◽  
Static Tensile ◽  
Simulation And Experiment

In order to investigate the performance of the adhesive bonding repair in composite structures, static tensile test is carried out on the bonding structures numerically and experimentally. The tensile stress–displacement behaviors of T7901 composite adhesive bonding structure is studied under room temperature. Based on the three-dimensional progressive damage theory, the model of adhesive bonding structures with different patch shape has been constructed, and the final failure strength is predicted using APDL language. Moreover, experiment has been performed on each adhesive bonding structure with different patch shape. The results indicate a good agreement with numerical predictions. Furthermore, it is found that the repair effect of the adhesive bonding structure with the square patch is better than others. The final damage pattern and damage range of the patch repair structure are also tested by X-ray machine, which are consistent with the simulation results.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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