| 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. |
- Karlsson, Lennart, et al.
(författare)
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Residual stresses and deformations in a welded thin-walled pipe
- 1989
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Ingår i: Weld residual stresses and plastic deformation. - New York : American Society of Mechanical Engineers. - 0791803295
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Konferensbidrag (refereegranskat)abstract
- Deformations and stresses during butt-welding of a pipe are calculated as well as the residual deformations and stresses. The temperature field during welding is calculated using an analytical solution. The deformations and stresses are calculated by use of the finite element method. A thermo-elastoplastic material model is used. Special attention is paid to the influence of the volume changes due to phase transformations on the deformations (radial shrinkage) and the residual stresses. The calculated radial shrinkage and residual stresses are compared to experimental values. Good agreement was obtained.
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| 4. |
- Lindgren, Lars-Erik, et al.
(författare)
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Contact forces and deformations in plate rolling
- 1989
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Ingår i: Numerical methods in industrial forming processes. - Rotterdam : Balkema Publishers, A.A. / Taylor & Francis The Netherlands. - 9061918979 ; , s. 331-336
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Konferensbidrag (refereegranskat)
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| 5. |
- Tam, S.C., et al.
(författare)
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Computer simulation of temperature fields in mechanised plasma-arc welding
- 1989
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Ingår i: Journal of Mechanical Working Technology. - : Elsevier BV. - 0378-3804. ; 19:1, s. 23-33
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Tidskriftsartikel (refereegranskat)abstract
- The process of the mechanised plasma-arc butt-welding of thin-gauge mild-steel sheets has been studied, both theoretically and experimentally. The transient temperature distribution has been computed using an analytical model due to Rosenthal. The results have then been compared with those generated by finite-element analysis using the commercial package PAFEC. The two sets of results were found to be in reasonably good agreement; moreover, the theoretical values were found to correlate fairly well with the results of experiments performed on a Messer Griesheim Uniwig G-200P plasma-arc welding machine.The extent of the heat-affected zone (HAZ) in the butt-welded specimens has been computed by analysing the temperature history at points lying transverse to the weldment: the theoretical values match fairly closely with those obtained from the welding experiments.The efficiency of the plasma-arc welding process has been estimated to be around 32% to 35%.
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