Study of laser bending of a preloaded Titanium alloy sheet

Abstract

Laser bending of sheet metals with preload offers some attractive characteristics/merits, comparing to laser free bending without prestressing on the metals. The study reported in this paper was focused on a Titanium alloy which finds widespread applications in aerospace manufacturing. FE simulation of laser bending with prestressing on the Titanium alloy sheet was conducted for the analysis of the bending process and experiment carried out to verify the model and the result. It was shown that the simulation result is close to that measured in the experiment. Based on the computed result, the load-displacement curve was analysed and transmission efficiency of the elastic energy defined to evaluate the bending effect. These enhanced understanding of the mechanism of laser bending with a preload. A method for the optimization on technological parameters was further proposed. Referring to the deformation targeted, the preload value was determined through the FE simulation. The result showed that, on the premise that the specimen surface can be prevented from damaging, transmission efficiency of the elastic energy could reach to the maximum value through adjusting technological parameters of the laser system and deformation accuracy of the specimen could also be improved through this approach. The work presented in this paper may find its application in the manufacture of Titanium alloy sheets with a more cost-effective and a more precise way.

Potential Utility of Metal–Organic Framework-Based Platform for Sensing Pesticides

“…To overcome such constraints, a feasible pesticide sensor is necessary, which can (1) widen the parameters associated with proper detection, that is, sensitivity, specificity, temperature range, pH range, and the type of pesticide, (2) provide rapid response, (3) be used under practical conditions, (4) provide quantitative as well as qualitative analyses, (5) be economically viable, and (6) be capable of miniaturization. Among a myriad of available nanomaterial systems, MOFs have emerged as a possible solution for selective and sensitive detection of OPs, based on biosensing, chemosensing, and electrochemical sensing techniques, as robust and novel sensors. − Figure shows the schematic diagram of MOF-based sensing approaches used for the detection of pesticides, which will be discussed in detail in the following subsections.…”

“…These authors first investigated the anti-interference effect of many volatile aromatic compounds (VOCs, e.g., aniline, m -xylene, mesitylene, p -nitroaniline, NB, and toluene) on the solid-state luminescence spectra of the MOFs. , Among the tested VOCs, those containing −NO 2 groups (e.g., NB and p -nitroaniline) exhibited a significant turn-off effect at the emission peak of the MOFs (λ em = 490 nm) . These authors observed an enhanced sensitivity of p -nitroaniline (LOD ≈ 4.9 × 10 –2 ppm), probably due to the hydrogen bonding interactions (N–H···O) between its amino group and the oxygen of bpdc. − …”

“…In addition to MOFs, other advanced (either functionalized or nonfunctionalized) materials (e.g., CNTs, QDs, and MIPs) have also offered realistic and straightforward solutions for the sensing of a wide array of pesticides (Table ). , Along with other NMs, MOFs can be used to develop highly miniaturized sensors capable of different sensing approaches based on biological, optical, and electrochemical principles. , The sensitivity of MOFs toward pesticides depends highly on their structural features and the type of pesticide, whereas the conditions prevalent during sensing can also influence their performance. As a result, some other NMs outperformed MOFs in this regard (Tables and ). , For instance, CdTe QDs were able to detect parathion down to 0.0013 ppb, whereas the LOD of NMOF1 approached 1 ppb (Tables and ).…”

Laser bending process of preloaded sheet metal

“…Moreover, the pre-bending platforms that used in these experiments can only work on few simple pre-bending types and small sized sheet metals [7,8,11].…”

Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions

“…TA15 (Ti-6Al-2Zr-1Mo-1V) alloy, a typical near a titanium alloy, has been widely used in manufacturing structural parts in the aerospace industry due to its excellent high-temperature strength, specific strength, thermal stability, weldability, low growth rate of fatigue crack, and strong corrosion resistance [42][43][44][45]. Wu et al [9] studied the regular characteristics of flow softening and globularization during hot working of TA15 alloy with initial lamellar microstructure.…”