A useful and increasingly common additive manufacturing (AM) process is the selective laser melting (SLM) or direct metal sintering (DMLS) process. SLM/DMLS can produce full-density parts from difficult materials, but it tends to suffer severe residual stresses introduced during processing. This limits usefulness applicability of process, particularly in fabrication with delicate overhanging protruding features. The purpose this study was examine current insight progress made toward...

One of the fundamental characteristics additively processed materials is that they are naturally anisotropic; this variance in mechanical properties primarily generated through formulation patterned shell and in-filled regions within material during processing. This paper describes results a study to ascertain impact strength various full–infill polymer-based orientations angles via fused deposition modeling. Ten different were tested using seven hatch three print orientations. Seven pure...

This paper describes the collection of a large dataset (6930 measurements) on dimensional error in fused deposition modeling (FDM) additive manufacturing process for full-density parts. Three different print orientations were studied, as well seven raster angles ( 0 ∘ , 15 30 45 60 75 and 90 ) rectilinear infill pattern. All measurements replicated ten times samples to ensure comprehensive dataset. Eleven polymer materials considered: acrylonitrile butadiene styrene (ABS), polylactic acid...

One of the most essential components fused deposition modeling (FDM) additive manufacturing (AM) process is build plate, surface upon which part constructed. These are typically made from aluminum or glass, but there clear disadvantages to both and restrictions on materials can be processed them successfully. This study examined suitability heated aluminum-polycarbonate (AL-PC) composite print beds for FDM, looking particularly at mechanical properties, thermal behavior, deformation bonding...

A useful and increasingly common additive manufacturing (AM) process is the selective laser melting (SLM) or direct metal sintering (DMLS) process. SLM/DMLS can produce full-density parts from difficult materials, but it tends to suffer severe residual stresses introduced during processing. This limits usefulness applicability of process, particularly in fabrication with delicate overhanging protruding features. The purpose this study was examine current insight progress made toward...

Abstract Empirical studies have shown complexity metrics to be good predictors of testing effort and maintainability in traditional, imperative programming languages. validation also that is a predictor initial quality reliability object‐oriented (OO) software. To date, one the most empirically validated OO Chidamber Kemerer Weighted Methods Class (WMC). However, there are many more whose predictive power has not been as extensively explored. In this study, we explore ability several...

Abstract This research details the effects of ozone pretreatment on flux a reverse osmosis membrane. Initial tests were conducted to determine ozonation solids removal, turbidity, and chemical oxygen demand concentrations using various doses simulated surface water. These initial showed that best reduction in 2–5 microns range was at 0.30 mg/L ozone. Next, series bench scale run for 62.5 hours standard system under constant pressure with three pre-ozonation no baseline dose. Temporal models...

The objective of this report is to present a simplified, activity-based costing approach for hospital emergency departments (EDs) use with Lean Six Sigma cost-benefit analyses. cost model complexity reduced by removing diagnostic and condition-specific costs, thereby revealing the underlying process activities' inefficiencies. Examples are provided evaluating savings from reducing discharge delays impact keeping patients in ED (boarding) after decision admit has been made....

Solid-propellant rockets are used for many applications, including military technology, scientific research, entertainment, and aerospace education. This study explores a novel method design modularization of the rocket airframes, utilizing additive manufacturing (AM) technology. The new replaces use standard part subsystems with complex multi-function parts to improve customization, flexibility, performance, reliability. To test effectiveness process, two experiments were performed on...

Process capability indices are considered to be one of the important quality measurement tools for continuous improvement and productivity. The most commonly used assume that process data normally distributed. However, many studies have pointed out normally-based very sensitive non-normal processes. Therefore we propose a new index applying weighted variance control charting method processes improve performance when non-normally main idea is divide skewed or asymmetric distribution into two...

A useful and increasingly common additive manufacturing (AM) process is the selective laser melting (SLM) or direct metal sintering (DMLS) process. SLM/DMLS can produce full-density parts from difficult materials, but it tends to suffer severe residual stresses introduced during processing. This limits usefulness applicability of process, particularly in fabrication with delicate overhanging protruding features. The purpose this study was examine current insight progress made toward...

The purpose of our study is to analyze whether the Bansiya and Davis quality models also reflect ongoing stability a software design in developed using highly iterative or agile process. We performed an empirical over multiple iterations various packages methods. examined several factor (reusability, flexibility, understandability, functionality, extendibility, effectiveness) this data set we compared them metrics. conclude that total index does indeed sets examined.

Purpose A useful potential application of additive manufacturing (AM) techniques is in automated assembly existing discrete parts via printing new material onto two or more simultaneously to form joints between them. The purpose this paper explore the concept extrusion-based AM for assembly, examine concerns and perform validation test feasibility value such an method. Design/methodology/approach To validate theory address concerns, six factorial-designed sets joined ABS, PETG PLA samples...

This report describes the collection of a large dataset (6930 measurement) on dimensional error in fused deposition modeling (FDM) additive manufacturing process for full-density parts. Three different print orientations were studied, as well seven raster angles (0°, 15°, 30°, 45°, 60°, 75°, and 90°) rectilinear infill pattern. All measurements replicated ten times samples to ensure comprehensive dataset. Eleven polymer materials...

Additively-manufactured (AM) materials have a defined mesostructure and natural voids which impact their structural stability; thin shells, do not the bulk to support or absorb effects of variances in properties, are particularly affected. Thin shells common feature many designs, providing good strength-to-weight ratios for applications, aerospace design domains. The use AM fabricate structures could both expand improve application space design, but this problem has yet been widely discussed...

The purpose of our study is to analyze whether the Bansiya and Davis quality models also reflect ongoing stability a software design in developed using highly iterative or agile process. We performed an empirical over multiple iterations various packages methods. examined several factor (reusability, flexibility, understandability, functionality, extendibility, effectiveness) this data set we compared them metrics. conclude that total index does indeed sets examined.

The purpose of our study is to analyze whether the Bansiya and Davis quality models also reflect ongoing stability a software design in developed using highly iterative or agile process. We performed an empirical over multiple iterations various packages methods. examined several factor (reusability, flexibility, understandability, functionality, extendibility, effectiveness) this data set we compared them metrics. conclude that total index does indeed sets examined.

A useful and increasingly common additive manufacturing (AM) process is the selective laser melting (SLM) or direct metal sintering (DMLS) process. SLM/DMLS can produce full-density parts from difficult materials, but it tends to suffer severe residual stresses introduced during processing. This limits usefulness applicability of process, particularly in fabrication with delicate overhanging protruding features. The purpose this study was examine current insight progress made toward...

This technical note discusses the theoretical static buckling load of thin-walled plastic cylinders under axial and radial loading. While is a well-researched topic, variety new design manufacturing methods, as well advances in polymer technologies, have brought structures into prominence recent years, necessitating re-examination exploration their behavior loads. work provides background review problem, discussion appropriate equations, an extensive case study to demonstrate concepts, brief...