Geometric effects play an important role in laser forming process; however, few investigations have been reported on the geometric size effect other than sheet thickness. In this paper, the influence of size effect, including sheet width and sheet length, on laser induced deformation is experimentally, numerically and analytically investigated. A size matrix is designed to cover a wide range of...

Molecular-crystal nanorods composed of 9-anthracenecarboxylic acid can undergo reversible bending due to molecular-level geometry changes associated with the photodimerization of the molecules in the crystal lattice. The use of highly focused near-IR femtosecond laser pulses results in two-photon excitation of micrometer-scale regions and is used to induce transient bends at various locations a...

Currently hot-bending of sheet metals is generally avoided. If absolutely necessary, oven-heating is usually used, with the disadvantage of unacceptable heating and cooling times, big energy input, handling problems, and change of material parameters. Inductive heating is better but it still has the problem of a large heated area and the fact that for thin sheet metals high frequencies are need...

UNLABELLED Cracking of tooth structure is a frequent mechanism of clinical failure necessitating treatment. Some laser conditions, particularly those without sufficient water cooling, may cause surface cracking of dentin. Surface cracks may serve as initiation sites for the onset of catastrophic fracture under mechanical stress, resulting in failure of the dentin. In this study, the hypothesis ...

In an experimental study of laser sheet bending, a 160W diode laser is used for twodimensional sheet bending of low-carbon steel. The variables investigated include metal sheet thickness, laser scan speed, laser power, laser beam width, and laser scan pass number. Bend surface appearances are also analysed. The laser sheet bend results demonstrate that a 940Nm diode laser is an effective tool f...

We demonstrate a chip-scale compact optical curvature sensor. It consists of a low threshold InGaAsP microdisk laser on a flexible polydimethylsiloxane polymer substrate. The curvature dependence of lasing wavelength was characterized by bending the cavity at different bending radii. The measurements showed that the lasing wavelength decreases monotonously with an increasing bending curvature. ...

A highly-efficient, flexible piezoelectric PZT thin film nanogenerator is demonstrated using a laser lift-off (LLO) process. The PZT thin film nanogenerator harvests the highest output performance of ∼200 V and ∼150 μA·cm(-2) from regular bending motions. Furthermore, power sources generated from a PZT thin film nanogenerator, driven by slight human finger bending motions, successfully operate ...