Transmission of Tension From a Bar to a Plate

Abstract When a bar or strip is lap-jointed to a plate, and transmits tension to it, the transmission is not effected only by a smooth distribution of force along the lap joint; there is also a highly concentrated force, a considerable fraction of the total tension, where the bar meets the plate, and a second force at the end of the bar. These forces are investigated by strain-gage measurements for various lengths of lap, and by a plane-stress calculation, with fair agreement. The results suggest that the fatigue strength of such joints will depend on the detailed local character of the joint where the bar meets the plate, rather than on the length of the joint.

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Finite element analysis of the effect of weld geometry and load condition on fatigue strength of lap joint

International Journal of Pressure Vessels and Piping ◽

10.1016/s0308-0161(01)00066-7 ◽

2001 ◽

Vol 78 (9) ◽

pp. 591-597 ◽

Cited By ~ 5

Author(s):

X.Y. Li ◽

T. Partanen ◽

T. Nykänen ◽

T. Björk

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Fatigue Strength ◽

Load Condition ◽

Lap Joint ◽

Element Analysis ◽

Weld Geometry

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Improved Fatigue Strength of a Dissimilar Metal T-Lap Joint Fabricated by Controlled Double-Pass Friction Stir Welding

Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020) - Lecture Notes in Mechanical Engineering ◽

10.1007/978-3-030-69610-8_1 ◽

2021 ◽

pp. 3-11

Author(s):

Masakazu Okazaki ◽

Hao Dinh Duong ◽

Satoshi Hirano ◽

Tra Hung Tran

Keyword(s):

Friction Stir Welding ◽

Fatigue Strength ◽

Lap Joint ◽

Double Pass ◽

Friction Stir ◽

Dissimilar Metal

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Spectral Fatigue Analysis of Plate Surface Hot-Spots: A Practical Solution to the Stress Direction Issue

Volume 2B: Structures, Safety, and Reliability ◽

10.1115/omae2020-18490 ◽

2020 ◽

Author(s):

Fabien Bigot ◽

Stéphanie Mougin

Keyword(s):

Finite Element ◽

Spectral Analysis ◽

Fatigue Strength ◽

Plane Stress ◽

Hot Spots ◽

Fatigue Analysis ◽

Multiaxial Fatigue ◽

The Other ◽

Plate Surface ◽

Practical Solution

Abstract Spectral Fatigue Analysis using coupled hydrodynamics and finite element models has now become a common practice for the fatigue strength assessment of offshore units, with established procedures given in Classification Rules. However, users are facing a practical issue that is almost never mentioned in the procedures. Indeed, many fatigue hot-spots are located on a plate surface, as opposed to plate edges. For such hot-spots, the finite element model results are the three components of the plane-stress stress tensor. Therefore, the outcome of the Spectral Fatigue Analysis is a set of three transfer functions (RAOs). On the other hand, our industry’s practice regarding the fatigue strength model is still the proven « design S-N curve » approach in combination with the Palmgren-Miner’s damage summation. As a consequence, today the engineer is left with no clear instruction about the proper way how to close this gap between the three stress RAOs on the one hand, and the single stress S-N curve on the other hand. If any advice is given, it is most often to consider the principal stresses, tentatively extending to spectral analysis the classification rule load cases approach. However, principal stress determination is a non-linear procedure that is not compatible with spectral analysis in frequency domain. Turning the spectral results into time domain to overcome this limitation is extremely costly and is not straightforward. Of course, a rational solution to this issue would be the adoption of a multiaxial fatigue damage criteria in lieu of the uniaxial S-N curve. But until such a multiaxial fatigue criteria is widely accepted in our industry, users have to square the circle, and force their stress tensor RAOs into the existing rule criteria. In this paper, a practical solution to reconcile plane stress results and conventional S-N curve criterion in spectral fatigue is proposed: the “facet approach “.

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