Abstract The accurate description of friction is critical in the finite element (FE) simulation sheet metal forming process. Usually, oversimplified through use a constant Coulomb coefficient. In this study, application an existing multiscale model extended to hot stamping accounts for effects tool and surface topography as well evolution contact pressure, temperature, bulk strain during stampi...

Location tracking technologies are penetrating increasingly in industrial environments. Several challenges arise when people or mobile assets are tracked. Security is one of the main problems that location tracking poses. In this position paper we want to address the long-term authentication and accountability of location tracking history information or path. In order to accomplish this, we gen...

To fully realize the advantages of organic flexible electronics, patterning is very important. In this paper we show that a purely additive patterning technique, termed polymer inking and stamping, can be used to pattern conductive polymer PEDOT and fabricate sub-micron channel length organic thin film transistors. In addition, we applied the technique to transfer a stack of metal/conjugated po...

We study the security of hash-then-publish time-stamping schemes and concentrate on the tightness of security reductions from the collision-resistance of the underlying hash functions. While the previous security reductions create a quadratic loss in the security in terms of time-success ratio of the adversary being protected against, this paper achieves a notably smaller loss of power 1.5. Thi...

We introduce a surface enhanced Raman spectroscopy (SERS) stamping approach for acquiring cell-surface specific vibrational spectra of individual living cells under physiological conditions. The SERS stamping approach utilizes a nanostructured metal surface on top of a lithographically defined piston that can be translated in 3-dimensions with nanometer resolution to contact living cells in sol...

This paper proposes a simple algorithm for solving the contact problems in relation to sheet stamping. The efficiency and reliability of the algorithm are demonstrated by an investigation of the stamping of elastic-plastic circular plates into a conical die with a hemispherical rigid punch. The analysis shows that the contact stress varies greatly with the punch displacement and deviates from t...

Nanocontact printing using hydrogen silsesquioxane (HSQ) soft stamps is studied for nanobio device fabrications in this work. The stamps with designed linewidth 80-200 nm were fabricated by low-dose e-beam lithography on HSQ films. The contact printing technique by using aminosilane as the ink on O2 plasma treated HSQ/Si substrates was developed. The plasma treatment, stamping force and stampin...

We report stamping surface-enhanced Raman spectroscopy (S-SERS) for label-free, multiplexed, molecular sensing and large-area, high-resolution molecular imaging on a flexible, nonplasmonic surface without solution-phase molecule transfer. In this technique, a polydimethylsiloxane (PDMS) thin film and nanoporous gold disk SERS substrate play the roles as molecule carrier and Raman signal enhance...