Effect of Bolt Tightness on the Behavior of Composite Joints

Nassar, Sayed A.; Virupaksha, Vinayshankar L.; Ganeshmurthy, Saravanan

doi:10.1115/1.2389000

Cited by 12 publications

(3 citation statements)

References 10 publications

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“…Furthermore, the delaminations are difficult to detect experimentally. Nassar et al (2007) used microscopically experimental technique to study the effect clamping force on the occurrence of delamination. Therefore, 3D finite element analysis may be a good candidate to predict the failure mode of composite bolted joints taking into its consideration delamination effects.…”

Section: Introductionmentioning

confidence: 99%

Progressive failure prediction of pinned joint in quasi-isotropic laminates used in pipelines

Abd-Elhady

Mubaraki

Sallam

2018

Lat. Am. j. solids struct.

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To simulate the progressive failure of pinned joint in quasi-isotropic [0/45/-45/90]s glass fiber reinforced polymer (GFRP) composite laminates used in pipeline, 3-D finite element model is employed in the present work. Hashin failure criterion as a progressive damage model associated with Virtual-CrackClosing-Technique (VCCT) delamination model has been adopted to predicate the failure due to fiber breakage, matrix cracking and delamination in composite pinned joint. This technique may be an innovation for this paper. W/D has been changed to get different modes of failure, i.e. tension, shear-out and bearing failures, in composite pinned joint,. The failure mode for GFRP composite pinned joint has been predicted finally after prediction the failure at each ply laminate of stacking sequence [0/45/-45/90]s. An experimental work of pinned joint in quasi-isotropic GFRP composite laminates has been conducted to validate the present numerical results. The numerical and experimental results showed an agreement between them. Therefore, the present 3D finite element model can be considered as a good candidate to expect the progressive damage in composite pinned joints. KeywordsComposite pinned joint, quasi-isotropic glass fiber reinforced polymer, 3-D finite element analysis, Hashin failure criteria, Virtual-Crack-Closing-Technique, delamination damage model.

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Section: Introductionmentioning

confidence: 99%

Progressive failure prediction of pinned joint in quasi-isotropic laminates used in pipelines

Abd-Elhady

Mubaraki

Sallam

2018

Lat. Am. j. solids struct.

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“…Nassar et al [19] investigated experimentally the effect of bolt-torque in single-lap, woven glass/epoxy composite joints (protruding head bolts). Finger-tight and fully-torqued conditions were examined.…”

Section: Introductionmentioning

confidence: 99%

Stress analysis of single-bolt, single-lap, countersunk composite joints with variable bolt-hole clearance

Egan

McCarthy

et al. 2012

Composite Structures

101

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Single-lap, carbon-epoxy joints with countersunk fasteners were modelled using the non-linear finite element code Abaqus. A highly-detailed analysis of the stress distribution at the countersunk hole boundary is provided. Bolt-hole clearance, which arises due to limitations in manufacturing capabilities, is modelled extensively. Clearance levels both inside and outside typical aerospace fitting tolerances are studied and the finite element model is validated with experimental data. Plots of radial stress in each ply of the countersunk laminate show the load transfer to be severely localised, with only a few plies bearing the majority of the load. The inclusion of clearance in the model was shown result in far higher radial stresses compared to those in the neat-fit joint model. An associated loss in joint stiffness of more than 10% was recorded for the highest clearance considered (240 µm). Finally compressive through-thickness stresses are shown to be present at the damageable region of the countersunk hole, and increase with bolt-hole clearance. These compressive stresses, which are an indicator of lateral constraint, are seen to suppress "brooming" failure in the countersunk laminate.

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“…Esendemir [1] also found that as the clamping load increased, the ultimate bearing strength showed a significant increase and the failure mode became one of net-tension for a greater range of joint geometries. Nassar et al [3] investigated experimentally the effect of bolt-torque on damage development in single-lap, woven glass-epoxy composite joints using protruding head bolts. Their microscopic study showed that no significant delamination occurred at the holes with fully-torqued bolts whereas delamination was observed at holes with finger-tight bolts.…”

Section: Introductionmentioning

confidence: 99%

Strength prediction in CFRP woven laminate bolted single-lap joints under quasi-static loading using XFEM

Ahmad

Crocombe

Smith

2014

Composites Part A: Applied Science and Manufacturing

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a b s t r a c tThis paper is concerned with modelling damage and fracture in woven fabric CFRP single-lap bolted joints that fail by net-tension. The approach is based on the assumption that damage (matrix cracking, delamination and fibre tow fracture) initiates and propagates from the hole in a self-similar fashion. A traction-separation law (based on physically meaningful material parameters) is implemented within an Extended Finite Element Method (XFEM) framework and used to predict the joint strength. Reasonable agreement between model and experiment was obtained for test configurations covering different weave types and lay-ups, a range of joint geometries (two hole diameters and a range of normalised joint widths) and finger-tight and fully torqued clamp-up conditions. The greatest discrepancies were for situations where the tensile fracture mechanisms were more complex, and hence not captured fully in the model or when bearing failure occurred.

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Effect of Bolt Tightness on the Behavior of Composite Joints

Cited by 12 publications

References 10 publications

Progressive failure prediction of pinned joint in quasi-isotropic laminates used in pipelines

Progressive failure prediction of pinned joint in quasi-isotropic laminates used in pipelines

Stress analysis of single-bolt, single-lap, countersunk composite joints with variable bolt-hole clearance

Strength prediction in CFRP woven laminate bolted single-lap joints under quasi-static loading using XFEM

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