Evaluation of different lap-shear joint geometries for automotive applications

Fessel, G.; Broughton, James; Fellows, N.A.; Durodola, J.F.; Hutchinson, A. R.

doi:10.1016/j.ijadhadh.2006.09.016

Cited by 97 publications

(50 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…6(c)), an opposite bending to the flat geometry is found, giving rise to σ11 stresses from approximately 10 MPa (near the bond) to 25 MPa (at the opposite face). As it was emphasized by Fessel et al [29], the compressive stresses in the adherends near the overlap edges may help to reduce shear stresses at these regions, resulting in a more uniform distribution of shear stresses.…”

Section: Stress Analysismentioning

confidence: 88%

“…Thus, τ peak stresses at the overlap edges become less significant with the increase of the adherends bending, up to K 0.5, increasing again for K 1 owing to the appearance of compressive σ11 stresses in the adherends near the overlap edges (Fig. 6) [29]. As a result of this modification, the shear loads get transferred by a larger region of the overlap, moving away from the overlap edges to the central overlap region [35].…”

Section: Stress Analysismentioning

confidence: 93%

“…The chosen values for the dimensions were as follows: tP 3 mm, tA 0.2 mm, variable bending radius (R) to achieve a pre-defined size for the internal fillet length (LF 3 mm), overlap length LO 20 mm, total length between grips LT 180 mm, and varying values of e to provide different values of K. Joints were tested between K 1 (single-lap joint with flat adherends) and K 1, also considering a joint with perfectly aligned adherends (K 0), based on evidence from previous works as the limiting range that can possibly yield a strength advantage over the flat geometry [29,35]. Following unanimous guidelines of published works on this matter [29,36], the adherend curvature was kept within the overlap range (Fig. 3) to further provide a reduction of stress concentrations at the overlap edges, considering a variable value of R that depends on K to produce an internal fillet size of 15% of the overlap (LF 3 mm).…”

Section: Experimental Workmentioning

confidence: 99%

“…Experimental testing also revealed that for the joint materials selected for the study, the failure strength of the joints could be increased up to 71%, compared with the flat joint. Fessel et al [29] performed an experimental and Finite Element study on tensile loaded steel single-lap joints, with emphasis on wavy and bent geometries. These modifications diminished peak peel and shear stresses at the overlap edges.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Strength Improvement of Adhesively-Bonded Joints Using a Reverse-Bent Geometry

Campilho

Pinto²,

Banea

et al. 2011

Journal of Adhesion Science and Technology

104

View full text Add to dashboard Cite

Adhesive bonding of components has become more efficient in recent years due to the developments in adhesive technology, which has resulted in higher peel and shear strengths, and also in allowable ductility up to failure. As a result, fastening and riveting methods are being progressively replaced by adhesive bonding, allowing a big step towards stronger and lighter unions. However, single-lap bonded joints still generate substantial peel and shear stress concentrations at the overlap edges that can be harmful to the structure, especially when using brittle adhesives that do not allow plasticization in these regions. In this work, a numerical and experimental study is performed to evaluate the feasibility of bending the adherends at the ends of the overlap for the strength improvement of single-lap aluminium joints bonded with a brittle and a ductile adhesive. Different combinations of joint eccentricity were tested, including absence of eccentricity, allowing the optimization of the joint. A Finite Element stress and failure analysis in ABAQUS ® was also carried out to provide a better understanding of the bent configuration. Results showed a major advantage of using the proposed modification for the brittle adhesive, but the joints with the ductile adhesive were not much affected by the bending technique.

show abstract

Section: Stress Analysismentioning

confidence: 88%

Section: Stress Analysismentioning

confidence: 93%

Section: Experimental Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Strength Improvement of Adhesively-Bonded Joints Using a Reverse-Bent Geometry

Campilho

Pinto²,

Banea

et al. 2011

Journal of Adhesion Science and Technology

104

View full text Add to dashboard Cite

show abstract

“…This technique was analysed by photoelasticity by McLaren and MacInnes [19], showing its effectiveness for the uniformization of the adhesive stresses along the bondline. Fessel et al [20] performed an experimental and FE study regarding tensile loaded steel single-lap joints, with emphasis on wavy and bent geometries. These modifications diminished peel and shear peak stresses at the overlap edges (from 8% to 40% compared to the flat geometry, depending on the adherends material and geometric parameters such as the overlap length).…”

Section: Introductionmentioning

confidence: 99%

Effect of hole drilling at the overlap on the strength of single-lap joints

Pinto¹,

Campilho

Mendes³

et al. 2011

International Journal of Adhesion and Adhesives

View full text Add to dashboard Cite

Bonded unions are gaining importance in many fields of manufacturing owing to a significant number of advantages to the traditional fastening, riveting, bolting and welding techniques. Between the available bonding configurations, the single-lap joint is the most commonly used and studied by the scientific community due to its simplicity, although it endures significant bending due to the non-collinear load path, which negatively affects its load bearing capabilities. The use of material or geometric changes in singlelap joints is widely documented in the literature to reduce this handicap, acting by reduction of peel and shear peak stresses at the damage initiation sites in structures or alterations of the failure mechanism emerging from local modifications. In this work, the effect of hole drilling at the overlap on the strength of single-lap joints was analyzed experimentally with two main purposes: (1) to check whether or not the anchorage effect of the adhesive within the holes is more preponderant than the stress concentrations near the holes, arising from the sharp edges, and modification of the joints straining behaviour (strength improvement or reduction, respectively) and (2) picturing a real scenario on which the components to be bonded are modified by some external factor (e.g. retrofitting of decaying/old-fashioned fastened unions). Tests were made with two adhesives (a brittle and a ductile one) varying the adherend thickness and the number, layout and diameter of the holes. Experimental testing showed that the joints strength never increases from the un-modified condition, showing a varying degree of weakening, depending on the selected adhesive and hole drilling configuration.

show abstract

Experimental investigation into the effect of adhesion properties of PEEK modified by atmospheric pressure plasma and low pressure plasma

Jha

Bhowmik

Bhatnagar

et al. 2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

High performance polymer, Polyether Ether Ketone (PEEK) (service temperature À250C to þ300 C, tensile strength: 120 MPa) is gaining significant interest in aerospace and automotive industries. In this investigation, attention is given to understand adhesion properties of PEEK, when surface of the PEEK is modified by two different plasma processes (i) atmospheric pressure plasma and (ii) low pressure plasma under DC Glow Discharge. The PEEK sheets are fabricated by ultra high temperature resistant epoxy adhesive (DURALCO 4703, service temperature À260 C to þ350 C). The surface of the PEEK is modified through atmospheric pressure plasma with 30 and 60 s of exposure and low pressure plasma with 30, 60, 120, 240, and 480 s of exposure. It is observed that polar component of surface energy leading to total surface energy of the polymer increases significantly when exposed to atmospheric pressure plasma. In the case of low pressure plasma, polar component of surface energy leading to total surface energy of the polymer increases with time of exposure up to 120 s and thereafter, it deteriorates with increasing time of exposure. The fractured surface of the adhesively bonded PEEK is examined under SEM. It is observed that unmodified PEEK fails essentially from the adhesive to PEEK interface resulting in low adhesive bond strength. In the case of surface modified PEEK under atmospheric pressure plasma, the failure is entirely from the PEEK and essentially tensile failure at the end of the overlap resulting in significant increase in adhesive bond strength.

show abstract

Evaluation of different lap-shear joint geometries for automotive applications

Cited by 97 publications

References 5 publications

Strength Improvement of Adhesively-Bonded Joints Using a Reverse-Bent Geometry

Strength Improvement of Adhesively-Bonded Joints Using a Reverse-Bent Geometry

Effect of hole drilling at the overlap on the strength of single-lap joints

Experimental investigation into the effect of adhesion properties of PEEK modified by atmospheric pressure plasma and low pressure plasma

Contact Info

Product

Resources

About