scholarly journals Temperature Effects on Damage Mechanisms of Hybrid Metal – Composite Bolted Joints Using SHM Testing Method

2019 ◽  
Vol 11 (1) ◽  
pp. 61-67
Author(s):  
Calin-Dumitru COMAN ◽  
Ion DIMA ◽  
Stefan HOTHAZIE ◽  
George PELIN ◽  
Tiberiu SALAORU
Keyword(s):  
Temperature Effects ◽  
Failure Modes ◽  
Damage Mechanism ◽  
Failure Criteria ◽  
Bolted Joints ◽  
Fracture Mechanisms ◽  
Progressive Damage ◽  
Metal Composite ◽  
3D Fem ◽  
Damage Mechanisms

This paper presents the quasi-static thermo-mechanical loading effects on the progressive damage mechanisms and failure modes of the single-bolt, single-shear, hybrid metal-composite, bolted joints in aerospace applications. A three-dimensional finite element method (FEM) technique was used to model the countersunk head bolted joint in details, including geometric and frictional based contact full nonlinearities and using commercial software PATRAN as pre/post-processor. The progressive damage analysis (PDA) in laminated (CFRP/ vinyl ester epoxy) composite material including nonlinear shear behavior, Hashin-type failure criteria and strain-based continuous degradation rules for different values of temperatures was made using SOL 400 NASTRAN solver. In order to validate the numerical results and close investigation of the fracture mechanisms for metal-composite bolted joints by determining ultimate failure loads, experiments were conducted in temperature controlled chamber using SHM (Structural Health Monitoring) technique. The results show that the thermal effects are not negligible on failure mechanism in hybrid aluminum-CFRP bolted joints having strong different thermal expansion coefficients. The complex 3D FEM model using advanced linear continuum solid-shell elements proved computational efficiency and ability to accurately predict the various failure modes as bearing and shear-shear out, including the temperature effects on the failure propagation and damage mechanism of hybrid metal-composite bolted joints.

scholarly journals The Influence of Temperature on the Strength of Hybrid Metal-Composite Multi-Bolts Joints

2020 ◽  
Vol 12 (3) ◽  
pp. 49-64
Author(s):  
Calin-Dumitru COMAN
Keyword(s):  
Temperature Effects ◽  
Failure Modes ◽  
Material Model ◽  
Element Model ◽  
Damage Mechanism ◽  
Failure Criteria ◽  
Bolted Joints ◽  
Metal Composite ◽  
Damage Initiation ◽  
Nonlinear Shear

This paper presents the temperature influence on the strength of the hybrid metal-composite multi-bolted joints. A detailed 3D finite element model, incorporating all possible nonlinearities as large deformations, in plane nonlinear shear deformations, elastic properties degradation of the composite material and friction-based full contact, is developed to anticipate the temperature changing effects on the progressive damage analysis (PDA) at lamina level and failure modes of metal-composite multi-bolted joints. The PDA material model accounts for lamina nonlinear shear deformation, Hashin-type failure criteria and strain-based continuum degradation rules being developed using the UMAT user subroutine in Nastran commercial software. In order to validate the temperature effects on the failure modes of the joint with protruding and countersunk bolts, experiments were conducted using the SHM (Structural Health Monitoring) technique in the temperature controlled chamber. The results showed that the temperature effects on damage initiation and failure modes have to be taken into account in the design process in order to fructify the high specific strength of the composites. Experimental results were quite accurately predicted by the PDA material model, which proved to be computational efficient and can predict failure propagation and damage mechanism in hybrid metal-composite multi-bolted joints.

scholarly journals Influence of Geometry on Failure Modes of Hybrid Metal-Composite Protruding Bolted Joints

2021 ◽  
Vol 13 (3) ◽  
pp. 29-44
Author(s):  
Calin-Dumitru COMAN
Keyword(s):  
Failure Modes ◽  
Material Model ◽  
Element Model ◽  
Damage Mechanism ◽  
Failure Criteria ◽  
Bolted Joints ◽  
Metal Composite ◽  
Damage Initiation ◽  
Failure Propagation ◽  
Geometry Effects

This article presents the influence of joint geometry on the damage mode in the CFRP (Carbon Fiber Reinforced Polymer) composite plate of the single-lap, protruding, hybrid metal-composite joints. A detailed 3D finite element model incorporating geometric, material and friction-based contact full nonlinearities is developed to numerically investigate the geometry effects on the progressive damage analysis (PDA) of the orthotropic material model. The PDA material model integrates the nonlinear shear response, Hashin-tape failure criteria and strain-based continuum degradation rules being developed using the UMAT user subroutine in Nastran commercial software. In order to validate the geometry effects on the failure modes of the joints with hexagonal head bolts, experiments were conducted using the SHM (Structural Health Monitoring) technique. The results showed that the plate geometry is an important parameter in the design process of an adequate bolted joint and its effects on damage initiation and failure modes were quite accurately predicted by the PDA material model, which proved to be computational efficient and can predict failure propagation and damage mechanism in hybrid metal-composite bolted joints.

Preload Effects on Failure Mechanisms of Hybrid Metal-Composite Bolted Joints

2019 ◽  
Vol 957 ◽  
pp. 293-302
Author(s):  
Calin Dumitru Coman ◽  
Dan Mihai Constantinescu
Keyword(s):  
Failure Modes ◽  
Material Model ◽  
Element Model ◽  
Damage Mechanism ◽  
Failure Criteria ◽  
Bolted Joints ◽  
Metal Composite ◽  
Damage Initiation ◽  
Failure Propagation ◽  
Nonlinear Shear

This paper presents the effects of torque preload on the damage initiation and growth in the CFRP (Carbon Fiber Reinforced Polymer) composite laminated adherent of the single-lap, single-bolt, hybrid metal-composite joints. A detailed 3D finite element model incorporating geometric, material and friction-based contact full nonlinearities is developed to numerically investigate the preload effects on the progressive damage analysis (PDA) of the orthotropic material model. The PDA material model integrates the nonlinear shear response, Hashin-tape failure criteria and strain-based continuum elastic properties degradation laws being developed using the UMAT user subroutine in Nastran commercial software. In order to validate the preload effects on the failure modes of the joints with hexagonal head bolts, experiments were conducted using the SHM (Structural Health Monitoring) technique. The results showed that the adherent torque level is an important parameter in the design process of an adequate bolted joint and its effects on damage initiation and failure modes were quite accurately predicted by the PDA material model, which proved to be computational efficient and can predict failure propagation and damage mechanism in hybrid metal-composite bolted joints.

scholarly journals Influence of Preload on Failure Modes of Hybrid Metal-Composite Protruding Bolted Joints

2021 ◽  
Vol 13 (1) ◽  
pp. 29-41
Author(s):  
Calin-Dumitru COMAN
Keyword(s):  
Failure Modes ◽  
Material Model ◽  
Element Model ◽  
Damage Mechanism ◽  
Failure Criteria ◽  
Bolted Joints ◽  
Metal Composite ◽  
Damage Initiation ◽  
Failure Propagation ◽  
Nonlinear Shear

This paper presents the effects of torque preload on the damage initiation and growth in the CFRP (Carbon Fiber Reinforced Polymer) composite laminated adherent of the single-lap, single-bolt, hybrid metal-composite joints. A detailed 3D finite element model incorporating geometric, material and friction-based contact full nonlinearities is developed to numerically investigate the preload effects on the progressive damage analysis (PDA) of the orthotropic material model. The PDA material model integrates the nonlinear shear response, Hashin-tape failure criteria and strain-based continuum elastic properties degradation laws being developed using the UMAT user subroutine in Nastran commercial software. In order to validate the preload effects on the failure modes of the joints with hexagonal head bolts, experiments were conducted using the SHM (Structural Health Monitoring) technique. The results showed that the adherent torque level is an important parameter in the design process of an adequate bolted joint and its effects on damage initiation and failure modes were quite accurately predicted by the PDA material model, which proved to be computational efficient and can predict failure propagation and damage mechanism in hybrid metal-composite bolted joints.

Temperature effects on joint strength and failure modes of hybrid aluminum–composite countersunk bolted joints

2019 ◽  
Vol 233 (11) ◽  
pp. 2204-2218 ◽  
Author(s):  
Calin-Dumitru Coman ◽  
Dan Mihai Constantinescu
Keyword(s):  
Temperature Effects ◽  
Failure Modes ◽  
Testing Machine ◽  
Material Model ◽  
Bolted Joints ◽  
Progressive Damage ◽  
Damage Analysis ◽  
Bearing Failure ◽  
Aluminum Composite ◽  
Damage Initiation

This paper presents the effects of temperature on the damage initiation and growth in the carbon fiber-reinforced polymer composite laminate of a hybrid aluminum–composite countersunk bolted joints designed for the bearing failure mode. Strain gage measurements conducted using an Instron testing machine coupled to a temperature-controlled chamber together with a detailed three-dimensional finite element model incorporating geometric, material and friction-based full contact nonlinearities are used to investigate the temperature effects on the progressive damage analysis of the orthotropic material model. The progressive damage analysis material model integrates the lamina nonlinear shear deformation, Hashin-type failure criteria and strain-based continuum degradation rules, being developed using the UMAT user subroutine in the MSC Patran-Nastran (MSC Software Corporation) commercial software. The results showed that the temperature effects on damage initiation and failure modes are quite accurately predicted by the progressive damage analysis material model, which proved to be computationally efficient and therefore can predict failure propagation and damage mechanisms. A low temperature increases the limit and ultimate forces and produces net-section failure, while a high temperature favors a bearing failure and even shear-out of the composite adherend of the hybrid aluminum–composite countersunk bolted joint.

scholarly journals Progressive Damage Numerical Modelling and Simulation of Aircraft Composite Bolted Joints Bearing Response

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5606
Author(s):  
Guoqiang Gao ◽  
Luling An ◽  
Ioannis K. Giannopoulos ◽  
Ning Han ◽  
Ende Ge ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Composite Laminates ◽  
Composite Structures ◽  
Failure Modes ◽  
Composite Plates ◽  
Failure Criteria ◽  
Bolted Joints ◽  
Progressive Damage ◽  
User Input ◽  
Product Cycles

Finite element numerical progressive damage modelling and simulations applied to the strength prediction of airframe bolted joints on composite laminates can lead to shorter and more efficient product cycles in terms of design, analysis and certification, while benefiting the economic manufacturing of composite structures. In the study herein, experimental bolted joint bearing tests were carried out to study the strength and failure modes of fastened composite plates under static tensile loads. The experimental results were subsequently benchmarked against various progressive damage numerical modelling simulations where the effects of different failure criteria, damage variables and subroutines were considered. Evidence was produced that indicated that both the accuracy of the simulation results and the speed of calculation were affected by the choice of user input and numerical scheme.

scholarly journals The Influence of Geometry on Failure Modes of Countersunk Bolted Hybrid Joints

2020 ◽  
Vol 12 (2) ◽  
pp. 19-34
Author(s):  
Calin-Dumitru COMAN
Keyword(s):  
Failure Modes ◽  
Numerical Study ◽  
Material Model ◽  
Element Model ◽  
Failure Criteria ◽  
Bolted Joints ◽  
Metal Composite ◽  
Damage Initiation ◽  
Geometry Parameter ◽  
Nonlinear Shear

This paper presents a numerical study for the influence of geometry on the damage initiation and growth in the CFRP (Carbon Fiber Reinforced Polymer) laminated plate of the hybrid metal-composite countersunk bolted joints. A detailed 3D finite element model incorporating material and friction-based contact full nonlinearities is developed to investigate the geometry effects on the failure modes of the hybrid metal-composite bolted joints. The material model for CFRP joint counterpart integrates nonlinear shear response for unidirectional laminae, Hashin-type failure criteria and strain-based continuum degradation rules which were developed using the UMAT user subroutine in MSC. Patran-Nastran (MSC. Software Corporation Inc.) commercial software. Experiments were conducted in order to validate the nonlinear progressive damage analysis (PDA) results on the failure modes of the joints with countersunk bolts. The numerical and experimental results showed that the joint geometry parameter defined by the ratio between the plates width and hole diameter has an important influence in designing phase of a reliable bolted joint and its effects on damage initiation and failure modes were quite accurately predicted by the numerical model, which proved to be computational efficient and could predict damage mechanisms in hybrid metal-composite countersunk bolted joints.

Effect of Metallic Inserts on the Strength of Pin Joints Prepared from Glass Fiber Reinforced Composites

2017 ◽  
Vol 67 (5) ◽  
pp. 592 ◽  
Author(s):  
Kulwinder Singh ◽  
J. S. Saini ◽  
H. Bhunia
Keyword(s):  
Glass Fiber ◽  
Failure Modes ◽  
Failure Criteria ◽  
Hole Diameter ◽  
Progressive Damage ◽  
Damage Analysis ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Failure Loads ◽  
Experimental Findings

The present study deals with the failure analysis of pin joints by varying different geometric parameters i.e., edge distance to hole diameter (E/D) ratio and width to hole diameter (W/D) ratio. Pin joints were prepared from the glass fiber reinforced laminates incorporating the metal inserts. A range of 2 to 5 and 3 to 6 was considered for E/D and W/D ratios, respectively. The stress around the hole was redistributed by incorporating the metal inserts in the hole to increase the load carrying capacity. To predict the failure loads and failure modes numerically, progressive damage analysis along with Hashin failure criteria was used in the pin joints. Strength of the pin joints increased in the range of 65 per cent to 92 per cent with metal insert due to the redistribution of the stresses around the hole. Progressive damage analysis gave a good correlation with experimental findings. Thereafter, the strength of the joint was predicted by varying the thickness of the metal inserts.

scholarly journals Investigation of mechanical performances of composite bolted joints with local reinforcements

2018 ◽  
Vol 25 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Jifeng Zhang ◽  
Qiang Xie ◽  
Yonggang Xie ◽  
Limin Zhou ◽  
Zhenqing Wang
Keyword(s):  
Finite Element ◽  
Tensile Strength ◽  
Failure Analysis ◽  
Failure Modes ◽  
Numerical Study ◽  
Progressive Failure ◽  
Failure Criteria ◽  
Bolted Joints ◽  
Progressive Failure Analysis ◽  
Mechanical Performances

AbstractFour different local reinforcement schemes used in composite bolted joints were studied. In numerical study, a set of 3-D failure criteria was used and the progressive failure analysis was implemented via user-defined subroutine vectorized user-material (VUMAT), which was programmed by the commercial finite element (FE) software ABAQUS. In the experiment, test specimens were manufactured with different local reinforcement schemes, and the mechanical performances of these specimens were tested under tensile loads. Failure modes of these specimens were observed and mechanical performances of test specimens with local reinforcement were studied. It was found that the numerical results agreed well with the experiment. It was also found that local reinforcement schemes influenced the mechanical performances of bolted joints obviously and that the tensile strength of composite bolted joints could be improved significantly by burying laminate slices.

scholarly journals Thermal Influence on the Stiffness of Hybrid Metal-Composite Countersunk Bolted Joints

2021 ◽  
Vol 13 (4) ◽  
pp. 35-45
Author(s):  
Calin-Dumitru COMAN COMAN
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Temperature Effects ◽  
Joint Stiffness ◽  
Element Model ◽  
Bolted Joints ◽  
Axial Stiffness ◽  
Metal Composite ◽  
3D Finite Element ◽  
3D Finite Element Model

This paper presents the effects of temperature on the axial stiffness of a hybrid metal-composite countersunk bolted joint designed for the bearing failure mode. A detailed 3D finite element model incorporating geometric, material and friction-based full contact nonlinearities is developed to numerically investigate the temperature effects on joint stiffness. In order to validate the temperature effects, experiments were conducted using an Instron testing machine coupled to a temperature controlled chamber. The results showed that the temperature effects on axial joint stiffness were quite accurately predicted by the 3D finite element model, denoting a reduction in the stiffness of the axial joint with an increase in temperature for hybrid metal-composite countersunk bolted joints.

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