Wilco M.H. Verbeeten, Miriam Lorenzo-Bañuelos, Rubén Saiz-Ortiz and Rodrigo González
The purpose of the present paper is to quantify and analyze the strain-rate dependence of the yield stress for both unfilled acrylonitrile-butadiene-styrene (ABS) and short carbon…
Abstract
Purpose
The purpose of the present paper is to quantify and analyze the strain-rate dependence of the yield stress for both unfilled acrylonitrile-butadiene-styrene (ABS) and short carbon fiber-reinforced ABS (CF-ABS) materials, fabricated via material extrusion additive manufacturing (ME-AM). Two distinct and opposite infill orientation angles were used to attain anisotropy effects.
Design/methodology/approach
Tensile test samples were printed with two different infill orientation angles. Uniaxial tensile tests were performed at five different constant linear strain rates. Apparent densities were measured to compensate for the voided structure. Scanning electron microscope fractography images were analyzed. An Eyring-type flow rule was evaluated for predicting the strain-rate-dependent yield stress.
Findings
Anisotropy was detected not only for the yield stresses but also for its strain-rate dependence. The short carbon fiber-filled material exhibited higher anisotropy than neat ABS material using the same ME-AM processing parameters. It seems that fiber and molecular orientation influence the strain-rate dependence. The Eyring-type flow rule can adequately describe the yield kinetics of ME-AM components, showing thermorheologically simple behavior.
Originality/value
A polymer’s viscoelastic behavior is paramount to be able to predict a component’s ultimate failure behavior. The results in this manuscript are important initial findings that can help to further develop predictive numerical tools for ME-AM technology. This is especially relevant because of the inherent anisotropy that ME-AM polymer components show. Furthermore, short carbon fiber-filled ABS enhanced anisotropy effects during ME-AM, which have not been measured previously.
Details
Keywords
Mehmet Ali Köseoglu, Yasin Sehitoglu, Gary Ross and John A. Parnell
This paper aims to illustrate how business ethics research is progressing in the tourism and hospitality (T/H) industries and suggest a research agenda.
Abstract
Purpose
This paper aims to illustrate how business ethics research is progressing in the tourism and hospitality (T/H) industries and suggest a research agenda.
Design/methodology/approach
This study applies bibliometric analysis to articles related to business ethics topics in the T/H fields published between 1995 and 2014 in six, nine and five leading hospitality-, tourism- and business ethics-oriented journals, respectively.
Findings
This study provides a broad view on business ethics research in the T/H fields based on leading authors, institutions, themes and methods used over the past two decades.
Research limitations/implications
This study assesses the progress of business ethics research in the hospitality and tourism fields. Only articles published in select, prominent Social Sciences Citation Index journals were analyzed.
Practical implications
This analysis focuses on published articles related to business ethics in the T/H fields. As such, it facilitates researchers, academic scholars and professionals in contributing to the field more effectively and advancing scientific progress in the literature. It aids practitioners by evaluating the extent to which scholars have investigated key issues in the field.
Originality/value
This study is the first to utilize bibliometric analysis to assess business ethics research focusing on T/H activities published in leading tourism, hospitality and business ethics journals.