Abstract
Multi Jet Fusion™ (MJF) is a new proprietary form of Additive Manufacturing (AM) from Hewlett Packard (HP) developed to manufacture structures with design and functional complexity while simultaneously providing a dramatic increase in the production rate relative to other forms of polymer-based AM. The increased rate is now enabling more efficient production of mid-volume products, and coupled with the additional benefits of geometric freedom, the technology is particularly well suited for the fabrication of complex manifold gas delivery systems. This paper describes a comprehensive study to evaluate the utility of MJF structures for maintaining pressures under static and dynamic conditions. The static pressure and gas confinement was applied to cylindrical structures at 345 and 689 kPa and pressure drops were measured in real-time. Similarly, fatigue pressure testing was performed for 10 5 cycles under 1724 kPa, and the cylinders demonstrated to be effective at maintaining a constant pressure under both ambient and high temperature (90 °C) conditions. Additional analyses relevant to the automotive industry were performed and included (a) gas permeation testing conducted with oxygen and carbon dioxide gas to study the gas storage performance on printed Polyamide-12 and (b) an oil chemical exposure experiment was performed to investigate mechanical performance degradation.
Highlights
Limited production rates remain one of the major challenges for additive manufacturing (AM)
The present work has investigated the mechanical and fatigue properties of Nylon-12 parts manufactured through the Multi Jet Fusion process
The present study has shown that printed Nylon-12 parts through the Multi Jet FusionTM (MJF) process results in structures capable of being used in pressure storage applications, both at room and high temperature and the following are the significant findings:
Summary
Limited production rates remain one of the major challenges for additive manufacturing (AM). Detailed review works have been conducted by Tan et al [11] and Yuan et al [12] on Polymer materials for additive manufacturing and polymer composites for powder based additive manufacturing They emphasize the importance of developing new methods for feedstock production, exploring new strategies to enhance the mechanical/thermomechanical performance of the printed. Parts for application in the automotive, aerospace, military, health care, biomedical engineering, water treatment, energy generation, sports equipment and acoustic devices This performance improvement is enabling additive manufacturing in terms of low-to-middle-level volume production (one to several thousands of units) of polymer products with comparable or better mechanical properties relative to other polymer additive manufacturing processes [7]. The group reported that the parts manufactured using MJF had higher elongation and tensile strength but lower Young’s modulus compared to SLS. The pre sent work investigates a series of mechanical properties for evaluating the performance of MJF parts targeting gas storage applications under static and fatigue pressure loading scenarios including two different
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