3D explicit simulation of bearing failure in metal-composite bolted joints

2021 ◽  
pp. 115108
Author(s):  
Mohammad S. Rouhi ◽  
Dimitra Ramantani ◽  
Tong Earn Tay
Keyword(s):  
Bolted Joints ◽  
Metal Composite ◽  
Bearing Failure ◽  
Explicit Simulation

On-site monitoring of bearing failure in composite bolted joints using built-in eddy current sensing film

2020 ◽  
pp. 002199832097973
Author(s):  
Qijian Liu ◽  
Hu Sun ◽  
Yuan Chai ◽  
Jianjian Zhu ◽  
Tao Wang ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Eddy Current ◽  
Failure Modes ◽  
Bolted Joints ◽  
Bearing Failure ◽  
Monitoring Method ◽  
Current Sensing ◽  
Site Monitoring ◽  
Array Sensing ◽  
Bearing Damage

Bearing damage is one of the common failure modes in composite bolted joints. This paper describes the development of an on-site monitoring method based on eddy current (EC) sensing film to monitor the bearing damage in carbon fiber reinforced plastic (CFRP) single-lap bolted joints under tensile testing. Configuration design and operating principles of EC array sensing film are demonstrated. A series of numerical simulations are conducted to analyze the variation of EC when the bearing failure occurs around the bolt hole. The results of damage detection in the horizontal direction and through the thickness direction in the bolt hole with different exciting current directions are presented by the finite element method (FEM). Experiments are performed to prove the feasibility of the proposed EC array sensing film when the bearing failure occurs in CFRP single-lap bolted joints. The results of numerical simulations and experiments indicate that bearing failure can be detected according to the variation of EC in the test specimen.

Strength predictions of single-lap woven fabric Kenaf composites bolted joints

2020 ◽  
Vol 14 (4) ◽  
pp. 7389-7395
Author(s):  
H. Ahmad ◽  
K. Supar
Keyword(s):  
Failure Modes ◽  
Bolted Joints ◽  
Woven Fabric ◽  
Strength Prediction ◽  
Good Prediction ◽  
Bearing Failure ◽  
Concentration Problem ◽  
Fabric Strength ◽  
Kenaf Composites ◽  
Kenaf Fibers

Application of woven fabric kenaf fibers in production of polymeric composites (known as woven fabric kenaf reinforced composite (WKRP)) were readily available in the literatures due to excellent tensile strength and elongation at break. Nevertheless, there are less reported work and information regarding to performance of these materials in bolted joints problem. Bolted joints demonstrate complicated damage morphologies either net-tension, shear-out or bearing failure modes dependence upon combination arrays of lay-up/joint variables. XFEM approach has been reported in the literature, yet the agreements are limited to net-tension failure resulting from stress concentration problem. The aim of this paper to carry out strength prediction work of single-lap WKRP/aluminium bolted joints by using Hashin formulation within 3D finite element framework. Hashin formulation which based on ply-by-ply basis seen to perform better prediction to bearing failure modes. The material properties incorporated within Hashin formulation was taken from a single-ply of woven fabric. Strength prediction from Hashin formulation showed a difference of less than ±25% in net tension-bearing failure mode, but less good predictions (some lay-up showed discrepancies of 50%) in smaller W/d to give net-tension mode. Good prediction in net-tension-bearing failure were exhibited in Hashin formulation than XFEM approach as bearing failure is based on ply-by-ply basis due to fiber kinking and matrix compression.

FEA of the Influence of Assembly Parameters on the Fatigue Life of Metal-Composite Bolted Joints

2012 ◽  
Vol 713 ◽  
pp. 73-78 ◽  
Author(s):  
I. Álvarez ◽  
F.J. Doblas ◽  
C. Vallellano ◽  
A. Portal ◽  
P.J. Arroyo
Keyword(s):  
Fatigue Life ◽  
Numerical Analysis ◽  
Fatigue Failure ◽  
Fatigue Resistance ◽  
Composite Laminate ◽  
Bolted Joints ◽  
Metal Composite ◽  
Critical Areas ◽  
Hybrid Joints ◽  
Al 2024

This paper presents a numerical analysis of the influence on the fatigue life of hybrid metal/CFRP bolted joints of some deviations in certain assembly parameters. Two types of hybrid joints typically used in aircraft are analyzed, the Ti-6Al-4V/CFRP and the Al-2024-T3/CFRP, riveted with blind bolts. The parameters analyzed are: the thickness of sealant between metal sheet and composite laminate, the angle of countersunk and the adjustment or chamfer at the countersunk-drill zone. The analysis highlights critical areas for fatigue failure and the relative influence of these parameters on the fatigue resistance of the joint.

Quasi-static bearing failure of CFRP composite in biaxially loaded bolted joints

2015 ◽  
Vol 125 ◽  
pp. 60-71 ◽  
Author(s):  
Zlatan Kapidžić ◽  
Hans Ansell ◽  
Joakim Schön ◽  
Kjell Simonsson
Keyword(s):  
Bolted Joints ◽  
Bearing Failure ◽  
Cfrp Composite

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.

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