Investigation of process-affected zone in ultrasonic embossing of microchannels on thermoplastic substrates

Date

2020-02-01

Author

Sucularli, Ferah
Arıkan, Mehmet Ali Sahir
Yıldırım, Ender

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

264
views

0
downloads

In this paper, the process-affected zone in ultrasonically embossed thermoplastic substrates is investigated both numerically and experimentally. Commercialization of microfluidic devices challenges the need for high-speed manufacturing of plastic chips. Ultrasonic embossing is considered as an alternative method since the cycle time can be as low as a few seconds per chip while keeping the cost relatively low. To examine the ultrasonic embossing process, experiments were carried out to replicate 200 mu m wide and 150 mu m high straight channels on 3 mm thick polymethylmethacrylate (PMMA) substrates. The mold was fabricated by milling on aluminum. The features could be embossed by applying an 85 N static force at 28 kHz ultrasonic vibration and 10 mu m amplitude for 5 s at room temperature with replication rates of 99.5 % and 100 % for the width and the depth, respectively. During the experiments, a clearly visible process-affected zone typically bounded by a half-circle with the center at the channel axis was observed. It was proven that the process-affected zone was bounded by the isothermal surface at the glass transition temperature of the substrate material (107 degrees C), both numerically and experimentally. It was also shown that the composition of the substrate material remains unaffected within the process-affected zone.

Subject Keywords

Management Science and Operations Research, Strategy and Management, Industrial and Manufacturing Engineering

URI

https://hdl.handle.net/11511/34423

Journal

JOURNAL OF MANUFACTURING PROCESSES

DOI

https://doi.org/10.1016/j.jmapro.2019.12.055

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

Analyzing the effects of inventory cost setting rules in a disassembly and recovery environment Akcali, Elif; Bayındır, Zeynep Pelin (Informa UK Limited, 2008-01-01) In this study we consider a disassembly and recovery facility receiving end-of-life products and facing demand for a specific part that is disassembled from the product and then recovered. The disassembly and recovery operations can be either performed before hand, or upon customer arrival. In the latter case, a discount on the selling price is applied to compensate the customer for waiting for the completion of the disassembly and recovery operations. One of the dificulties faced in planning for such a sys...
Analysis of an inventory system under supply uncertainty Gullu, R; Onol, E; Erkip, N (Elsevier BV, 1999-03-20) In this paper, we analyze a periodic review, single-item inventory model under supply uncertainty. The objective is to minimize expected holding and backorder costs over a finite planning horizon under the supply constraints. The uncertainty in supply is modeled using a three-point probability mass function. The supply is either completely available, partially available, or the supply is unavailable. Machine breakdowns, shortages in the capacity of the supplier, strikes, etc., are possible causes of uncerta...
An approach to two-dimensional cutting stock problems Dağlı, Cihan H.; Tatoğlu, Yalçın (Informa UK Limited, 1987-2) One of the resource utilization problems is the location of two-dimensional patterns onto stock sheets with finite dimensions. Stock sheets, in this respect, are depletable resources to be used and the remaining material which is known as the scrap (or trim loss) cannot usually be used later for allocating patterns. Thus, a decrease in the amount of scrap yields a decrease in the raw material cost. In the solution of the problem, usually templates of the patterns to be cut are placed on a stock sheet and th...
A multicriteria sorting approach based on data envelopment analysis for R&D project selection problem Karasakal, Esra (Elsevier BV, 2017-12-01) In this paper, multiple criteria sorting methods based on data envelopment analysis (DEA) are developed to evaluate research and development (R&D) projects. The weight intervals of the criteria are obtained from Interval Analytic Hierarchy Process and employed as the assurance region constraints of models. Based on data envelopment analysis, two threshold estimation models, and five assignment models are developed for sorting. In addition to sorting, these models also provide ranking of the projects. The de...
On the classical Maki-Thompson rumour model in continuous time Belen, Selma; Kropat, Erik; Weber, Gerhard Wilhelm (Springer Science and Business Media LLC, 2011-03-01) In this paper, the Maki-Thompson model is slightly refined in continuous time, and a new general solution is obtained for each dynamics of spreading of a rumour. It is derived an equation for the size of a stochastic rumour process in terms of transitions. We give new lower and upper bounds for the proportion of total ignorants who never learned a rumour and the proportion of total stiflers who either forget the rumour or cease to spread the rumour when the rumour process stops, under general initial condit...

Citation Formats

F. Sucularli, M. A. S. Arıkan, and E. Yıldırım, “Investigation of process-affected zone in ultrasonic embossing of microchannels on thermoplastic substrates,” JOURNAL OF MANUFACTURING PROCESSES, pp. 394–402, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34423.