Design Data for Graphite Cloth Epoxy Bolted Joints at Temperatures up to 450 K

Bailie, J. A.; Duggan, M. A.; Bradshaw, NC; McKenzie, TG

doi:10.1520/stp33480s

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…Although bolt-bearing tests have been conducted by many investigators in the past [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], limited data were available to fairly assess the validity of the 3-D model and the computer code, 3DBOLT/ABAQUS. A recent study by Hung et al [13] provided a comprehensive insight of the failure mechanism of bolt-bearing damage, but focused only on a single washer size in their experiments.…”

mentioning

confidence: 99%

The Response of Composite Joints with Bolt-Clamping Loads, Part II: Model Verification

Sun¹,

Chang²,

Qing

2002

Journal of Composite Materials

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Extensive experiments were performed to characterize the material response due to bearing failure in composite bolted joints with and without lateral clamp-up supports. Composite plates made of T800H/3900-2graphite/epoxy were selected in the tests, and various washer sizes and clamping forces were used in the study. The clamping force in the bolt was found to vary with the applied load, and may increase significantly due to a sudden through-the-thickness expansion of the laminate under the washers where bearing failure occurred. Experiments showed that the joint strength and response can be significantly affected by the bolt clamp-up, and the bolt bearing failure is a 3-D phenomenon. The results of the tests were utilized to verify the model predictions proposed in Part I of the study. The model predicts both the failure load and response of bolted composite joints very well for various clamping forces and washer sizes. The predicted bolt clamp-up load as a function of the applied load agreed also well with the data, which validates that the proposed incompressibility assumption in the model for bearing-damaged material. Based on the model, a parametric study was performed to evaluate the sensitivities of bearing load to bolt stiffness, clamping force, washer size, joint geometry such as width, edge distance and bolt sizes.

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confidence: 99%

The Response of Composite Joints with Bolt-Clamping Loads, Part II: Model Verification

Sun¹,

Chang²,

Qing

2002

Journal of Composite Materials

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“…Many authors have conducted experimental studies showing that elevated temperatures reduce the strength of polymer matrix composite joints [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Additionally, a few twodimensional analysis models were developed to investigate the bearing behavior of composite joints at elevated temperatures [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Thermal Effects on the Pin-Bearing Behavior of IM7/PETI5 Composite Joints

Walker

2002

Journal of Composite Materials

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Thermal effects on the pin-bearing behavior of an IM7/PETI5 composite laminate are studied comprehensively within this paper. Pin-bearing tests of several lay-ups at the operating temperatures of −129, 21, and 177°C are conducted to generate data on the effect of temperature changes on the pin-bearing behavior of the IM7/PETI5 material. A unique computational study investigating the factors influencing pin-bearing strength is performed for the [90,0]8s lay-up. A detailed three-dimensional finite element model is developed including the modeling of resin layers between plies in the laminate with a pin hole. Using a previously established technique, the pin-bearing problem was modeled assuming a rigid frictionless pin and restraining only radial displacements at the hole boundary. An original three-dimensional solution, where thermal residual stresses were combined with the state of stress due to pin-bearing loads was evaluated. The presence of thermal residual stresses were observed to intensify the interlaminar stresses predicted at the hole boundary in the pin-bearing problem. Furthermore, the research shows that changes in material properties drives pin-bearing strength degradation with increasing temperature. The thermal residual cure stresses then somewhat affect the extent that the pin-bearing strength changes with temperature. In general, thermal residual stresses were determined to be significant in affecting pin-bearing strength.

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“…This is mainly attributed to the absence of load sharing due to plastic yielding [3,4]. Baillie et al [5] suggested that all bolts in a given joint are only loaded equally at failure, while Madenci et al [6] showed that the maximum bolt hole stress occurred closest to the loaded edge. The commonly observed modes of failure in bolted composite joints are similar to the ones observed in metallic bolted joints namely: tension, cleavage, bearing and shear out.…”

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confidence: 99%

Analysis of Bolted Flanged Panel Joint for GRP Sectional Tanks

et al. 2014

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The performance of flanged panel bolted joints used in Glass Reinforced Plastic (GRP) sectional tanks is investigated using a combination of experimental and computational methods. A four-panel bolted assembly is subjected to varying pressure in a rupture test rig to study damage development at the intersection of the four panels. It is found that cracking initiates at a panel corner at the four panel intersection at a pressure of 35 kPa and propagates to other panel corners with increasing pressure. This is attributed to the excessive deformation at the four panel intersection. The effect of bolt spacing, varying end distances and bolt pre-tension in decreasing the localized deformation and maximum induced stresses are investigated using finite element analysis. It is found that varying the amount of bolt spacing and end distances had a considerable influence on the joint performance whereas varying bolt pretension had very negligible effect. Consequently, this study establishes the maximum pressure which the GRP panel joint can withstand without failure and the corresponding optimum joint parameters.

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Design Data for Graphite Cloth Epoxy Bolted Joints at Temperatures up to 450 K

Cited by 10 publications

References 2 publications

The Response of Composite Joints with Bolt-Clamping Loads, Part II: Model Verification

The Response of Composite Joints with Bolt-Clamping Loads, Part II: Model Verification

Thermal Effects on the Pin-Bearing Behavior of IM7/PETI5 Composite Joints

Analysis of Bolted Flanged Panel Joint for GRP Sectional Tanks

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