Characterization of the residual strains in iterative laser forming |
| |
Authors: | S.M. KnupferA.M. Paradowska O. KirsteinA.J. Moore |
| |
Affiliation: | a Heriot-Watt University, School of Engineering and Physical Sciences, Edinburgh EH14 4AS, UK b ISIS Neutron Scattering Facility, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK c Australian Nuclear Science and Technology Organisation PMB 1, Menai, NSW 2234, Australia |
| |
Abstract: | In laser forming, thermally induced strains transverse to the laser scan line vary with depth in the material and contribute most significantly to the desired deformation. The through-thickness transverse residual strain distribution was measured by neutron diffraction in laser-formed low carbon steel and aluminium alloy specimens. The specimens were formed with a wide range of laser line energies covering the temperature gradient mechanism (TGM) and shortening or upsetting mechanism (SM), and for single and multi-pass forming (up to 3 laser passes). Below the saturation line energy where the TGM dominates, the gradient of the through-thickness strain distribution was found to increase with increasing line energy and number of laser passes; the gradient decreased again at line energies above the saturation line energy where the efficiency of the TGM decreases. Iterative laser forming can be applied to reduce weld-induced distortions. The peak longitudinal strain measured in the weld seam of a specimen that had been straightened by iterative laser forming was also significantly reduced. |
| |
Keywords: | Iterative laser forming Iterative laser bending Iterative laser straightening Residual strain Neutron diffraction Weld distortion |
本文献已被 ScienceDirect 等数据库收录! |
|