| 1. |
- Fällström, Karl-Evert, et al.
(författare)
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Transient bending waves in anisotropic plates studied by hologram interferometry
- 1989
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Ingår i: Experimental mechanics. - 0014-4851 .- 1741-2765. ; 29:4, s. 409-413
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Tidskriftsartikel (refereegranskat)abstract
- Propagating bending waves are studied in plates made of glass-fiber reinforced polyester. The waves are generated by the impact of a ballistic pendulum. Hologram interferometry, with a double pulsed ruby laser as light source, is used to record the out of plane motion of the waves. The interferograms have an elliptic-like symmetry for an orthotropic plate, while the wave pattern for a symmetric angle-ply reinforced plate has a symmetry about the axes of reinforcements. Experimental data are compared on one hand to analytical results obtained by assuming that the orthotropic plate can be described as if isotropic along the main axes, and on the other hand to numerical results from calculations using the finite-element method. The effective Young's modulus raised to power 1/4 is shown to be an important parameter for the description of the dispersive wave pattern. A defect in the plate alters the wave pattern in the interferograms significantly. This may have technical use.
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| 2. |
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| 3. |
- Jonsson, Mikael, et al.
(författare)
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Deformations and stresses in butt-welding of large plates with special reference to the mechanical material properties
- 1985
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Ingår i: Journal of engineering materials and technology. - : ASME International. - 0094-4289 .- 1528-8889. ; 107:4, s. 265-270
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Tidskriftsartikel (refereegranskat)abstract
- Simulation of automatic butt-welding of large plates was investigated. Two different steels were considered. The plates were tack-welded before the butt-welding. The simulation includes the tack-welding, the butt-welding and the cooling to room temperature. The simulations should lead to an understanding of the mechanics behind the change in gap width in front of the moving arc, which is of importance in automatic welding production. The residual stresses due to the butt-welding were also studied. The magnitude and the distribution of the residual stress are important in design of welded structures.
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| 4. |
- Jonsson, Mikael, et al.
(författare)
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Kan svetsegenspänningar och svetsdeformationer förutsägas?
- 1986
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Ingår i: Svetsen. - 0039-7091. ; 45:5, s. 6-9
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Many difficulties in welding result from the fact that heat input causes uneven heating of the welded object. This article reports on the results of an investigation carried out with the object to find out whether it is possible to predict residual stresses in welding and weld deformations with the aid of new computational methods used in continum mechanics. Butt welding of flat plates was studied in this investigation. Deformations, residual stresses, and gap width variations during the welding process were calculated.
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| 5. |
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| 6. |
- Jonsson, Mikael, et al.
(författare)
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Plate motion and thermal stresses in root-bead butt-welding of plates
- 1985
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Ingår i: Numerical methods in thermal problems. - Swansea : Pineridge Press. - 0906674441 ; , s. 1092-1102
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Konferensbidrag (refereegranskat)abstract
- In this paper root-bead welding of plates of two different sizes was experimentally and theoretically analysed. The material of the plates was a fine-grain steel with yield limit 360 MPa. The finite element method was used for both the thermal analyses and the mechanical analyses. Temperature-dependent material properties and volume changes due to phase transformations were considered. Plane stress conditions were assumed. Good agreement between calculated and measured values were obtained.
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| 7. |
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| 8. |
- Jonsson, Mikael, et al.
(författare)
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Simulation of tack welding procedures in butt joint welding of plates
- 1985
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Ingår i: Welding Journal. - 0043-2296. ; 64:10, s. 296-301
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Tidskriftsartikel (refereegranskat)abstract
- The influence of tack welding procedure on change in root opening was investigated. This change during the first part of welding depends on the order in which the tack welds are made. It is also affected by the starting position of the welding arc. These effects were studied in seven theoretical analyses - three cases where the tack welding procedures differed and four cases where the temperature fields at the beginning of the butt joint welding differed. The material investigated was a fine-grain steel with a yield stress of 360 MPa (52,200 psi) at room temperature. The filler material was ESAB 1. 2/12. 51 (AWS ER70S-6).
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| 10. |
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