On the bearing strengths of cfrp laminates

Collings, T.A.

doi:10.1016/0010-4361(82)90006-4

Cited by 131 publications

(43 citation statements)

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“…4(c). This assumed strain distribution has been used by other workers [35,36] with good results. Obviously, if larger clearances occurs the assumption is no longer valid as the strains will be increased due to the reduced contact area.…”

Section: Simplifying Assumptionsmentioning

confidence: 70%

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Simple and efficient prediction of bearing failure in single shear, composite lap joints

Ekh

Schön

Zenkert

2013

Composite Structures

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PostprintThis is the accepted version of a paper published in Composite structures. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Ekh, J., Schön, J., Zenkert, D. (2013) Simple and efficient prediction of bearing failure in single shear, composite lap joints. AbstractA straightforward procedure to predict bearing strength in bolted composite structures has been developed. The method is based on a finite element analysis, using structural elements, followed by a post-processing procedure. Bolt-hole clearance, friction between member plates, fastener clamp-up and fastener deformation is accounted for. Forces calculated in the FE-analysis are converted into a local stress field which is used in an existing criterion to predict fiber micro buckling in the most critically loaded lamina. Predictions were compared with experiments which validated the method. The small computational cost required by the procedure suggests that the method is applicable on large scale structures and suitable to use in conjunction with iterative schemes such as optimization and statistical investigations.

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Section: Simplifying Assumptionsmentioning

confidence: 70%

“…This yields τ xz = µσ max xx (35) where µ is the coefficient of friction between the fastener and the plate. A simple model is adopted to obtain an approximative value of the transverse stresses caused by the pressure between the washer and the plate.…”

Section: Estimation Of the Local Stress Fieldmentioning

confidence: 99%

Simple and efficient prediction of bearing failure in single shear, composite lap joints

Ekh

Schön

Zenkert

2013

Composite Structures

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“…Collings [6] described tests to determine the basic properties of multi-directional fiber reinforced plastics around a central circular hole in a plate loaded in tension by means of a pin in the hole. Collings [7] has also made the bearing strength measurements on [0/T45], [0/90] and [90/T45] carbon epoxy composites and he discussed the effects of variables such as ply orientation and laminate thickness. Thickness effect of pinned joints for composites was also investigated by Cohen et al [8] and Liu et al [9].…”

Section: Introductionmentioning

confidence: 98%

Behavior of Pin-loaded Laminated Composites

Baba

2006

Exp Mech

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In this study, an investigation was carried out to determine the effects of joint geometry and fiber orientation on the failure strength and failure mode in a pinned joint laminated composite plate. Behavior of pin-loaded laminated composites with different stacking sequence and different dimensions has been observed experimentally. E/glass-epoxy composites were manufactured to fabricate the specimens. Mechanical properties of the composites were characterized under tension, compression and in-plane shear in static loading conditions. Laminated composites were loaded through pins. Single-hole pin-loaded specimens were tested for their tensile response and width-tohole diameter (W/D) and edge distance-to-hole diameter (E/D) ratios evaluated. A series of experiments was performed with six different material configurations ([0/T45] s -[90/T45] s , [0/90/0] s -[90/0/90] s and [90/ 0] 2s -[T45] 2s ), in all, over 120 specimens. E/D ratios and W/D ratios of plates were changed from 1 to 5 and 2 to 5, respectively. Failure propagation and failure type were observed on the specimens. The influence of the joint geometry on the strength of the pin-loaded composites was assessed. When laminated composite plates were loaded to final failure, three basic failure modes consisting of net-tension, shear out and bearing failure were observed for the different geometric dimensions. All the connections tested showed that the fiber orientations have a definite influence on the position around hole circumference at which failure initiated. Net-tension failure occurred for specimens that had small width and large end distance. When the width was increased, the specimens which had small end distances failed in the shear-out modes. When the end distance was increased, bearing failure developed in addition to shear-out failure. The experimental results showed that the ultimate load capacities of E/glassepoxy laminate plates with pin connection were increased by increasing W and E. However, increasing the E/D and W/D ratios beyond a critical value has an insignificant effect on the ultimate load capacity of the connection.

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“…An experimental study by Collings [1982] investigated the factors affecting the strength of bolted joints in multi-directional carbon fiber reinforced polymer (CFRP)…”

Section: Composite Bolted Joints Subjected To Axial and Flexure Loadingmentioning

confidence: 99%

Testing and Analysis of Hybrid Composite/Metal Connections and Hull Section for the MACH Project

Kabche¹,

Caccese²,

Berube³

2006

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This report summarizes the development, testing and analysis of hybrid composite/metal connections and hybrid structural systems under the Modular Advanced Composite Hullform (MACH) project. The MACH project, funded by the Office of Naval Research, is part of a joint effort between the University of Maine, Navatek of Honolulu, HI, and Applied Thermal Sciences (ATS) of Sanford, Maine, and is performed in conjunction with the Naval Surface Warfare Center at Carderock, MD (NSWCCD). The primary motivation for the work summarized herein is to provide alternatives to conventional hull construction techniques and conventional hull forms by using modular hybrid construction methods. Included is a description of tests performed on sub-scale hybrid bolted connections, where the objective was to develop watertight connections for removable panels. An experimental study was conducted to quantify the performance of numerous hybrid joints with various geometries, loaded in flexure. The test results showed that for resisting bending loads, joints with doubler plates can be made stronger and rotationally stiffer than standard bolted joints, while also mitigating opening of the joint, thereby improving the ability to seal the connection for watertight integrity.The results of this study were used to select a connection geometry, which was incorporated into the hydrostatic testing of a full-scale four-panel assembly. Testing of the assembly is described in this report and shows that a linear response of the system was observed up to its design pressure load of 82.74 kPa. Damage initiated as stiffener delamination at 1.4 times the design load. After failure of several stiffeners, the hybrid assembly withstood up to 3 times its design load without leakage. Hence, the response of the hybrid joint employed was deemed successful.Numerical analysis of the connections and assembly are also presented. Simplified shell finite element models were developed at both local and global levels. These models were for estimation of the joint stiffness and good correlation with the test results was observed. Strength of the system was predicted using detailed plane strain contact models to capture the three-dimensional effects of the connection. ii ACKNOWLEDGMENTSThe authors gratefully acknowledge funding for this project through the Office of Naval

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On the bearing strengths of cfrp laminates

Cited by 131 publications

References 1 publication

Simple and efficient prediction of bearing failure in single shear, composite lap joints

Simple and efficient prediction of bearing failure in single shear, composite lap joints

Behavior of Pin-loaded Laminated Composites

Testing and Analysis of Hybrid Composite/Metal Connections and Hull Section for the MACH Project

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