Additive manufacturing is a recent trend in production processes owing to its many benefits. It can be defined as the process of producing parts through the deposition of material in a layer-by-lay...

https://journals.sagepub.com/doi/pdf/10.1177/1687814018822880

Additive manufacturing: Challenges, trends, and applications:

https://digitalcommons.mtu.edu/cgi/viewcontent.cgi?article=3057&context=michigantech-p

Plastic recycling in additive manufacturing: A systematic literature review and opportunities for the circular economy

Additive Manufacturing of Piezoelectric Materials

In the present study Inconel 625 alloy fabricated using Cold Metal Transfer (CMT) Wire Arc Additive Manufacturing (WAAM) has been investigated. The microstructure and mechanical properties of the fabricated Inconel625 alloy, and the influence of torch travel speed on the properties of the manufactured specimens were researched. Microstructural studies revealed variation in microstructure in different layers of the specimen, with the bottom layer consisting of fine primary cellular grains. Mechanical properties that include hardness and tensile properties showed that with the increase in the travel speed, average micro-hardness of the manufactured specimens slightly improved from 248 HV to 253 HV. The ultimate tensile strength (UTS) increased from 647 MPa to 687 MPa, while yield strength (YS) increased from 376 MPa to 400 MPa. Results showed that the mechanical performance of the manufactured components by CMT-WAAM method was better than the mechanical properties of Inconel 625 alloy casting parts except UTS, which demonstrated that the Inconel 625 alloys can be fabricated by cold metal transfer process.

Microstructure and mechanical properties of Inconel 625 fabricated by wire-arc additive manufacturing

Considering the stringent regulations, manufacturing of aircraft parts is often quite complex and time consuming. The multi-million components, multi-tier manufacturing systems and the severe constraints surrounding the sector lead to heavy inventory investments to achieve the just-in-time supply of parts often needed to reduce the airplane ground times. Additive manufacturing evolved allowing for the direct production of complex parts based on digital data with no complex tooling or machinery, a messiah of true just in time production. Appropriate integration of additive manufacturing with the aircraft industry could resolve some of the supply chain and inventory hurdles. Significant progress is already evident in these lines, but the lack of quality assurance attributes and certification standards is hampering the progress. The state-of-the-art of the application of additive manufacturing in the aircraft industry is reviewed in this paper.

https://www.longdom.org/articles/additive-manufacturing-for-the-aircraft-industry-a-review.pdf

Additive Manufacturing for the Aircraft Industry: A Review.

The paper first presents a brief review of development courses of additive manufacturing technology and summarizes the development status and the application fields of additive manufacturing technology, then, according to the manufacturing methods, it focuses on the principles and characteristics of several main additive manufacturing technologies. This paper also analyzes the existing problems and challenges of additive manufacturing technology and its future development trend. This paper aims to provide references for the development direction of additive manufacturing technology in developing countries.

The research status and development trend of additive manufacturing technology

Fracture propagation and induced strain response during supercritical CO2 jet fracturing

Abstract. The cutting mechanical properties of impregnated diamond bit depend on the performance of its cutting elements. Aiming at the factors affecting the
cutting element performance of impregnated diamond bit, the laboratory rock breaking experiment of impregnated micro bit is carried out. The results
show that the breaking work ratio and unit wear first decrease and then increase with the increase of diamond particle size and concentration when
drilling sandstone; the rock breaking efficiency and wear resistance are the highest when the concentration is 125 %. The breaking work ratio
first decreases and then increases with the increase of diamond particle size when drilling limestone; the rock cutting efficiency is the highest
when the concentration is 100 %. With the increase of diamond particle size, the breaking work ratio increases and the unit wear decreases when
drilling granite; the rock cutting efficiency and wear resistance are the highest when the concentration is 150 %.


/pdf/drilling-performance-analysis-of-impregnated-micro-bit-vu0scra9.pdf

Drilling performance analysis of impregnated micro bit

Research on Cutter Surface Shapes and Rock Breaking Efficiency Under High Well Temperature

Based on fundamental theory and proceeding from major factor influencing the cone/bit speed ratio, the calculation model for calculating the average cone/bit speed ratio is to be derived. To contrast verify model calculated results with experimental results, they are closely coincide with each other. And further amend the model associating with tooth row and cone structural characters and drilling environment to make the cone/bit speed ratio more reasonable than calculation model. The cone/bit speed ratio calculation model is simple. The parameter in the model is precise and it is easy to get and convenient to calculate practically. The cone/bit speed ratio calculation model provides roller cone bit design, analysis and rock breaking mechanism research with effective theoretical foundation. The model is of high value for application.

Ying-xin Yang

Papers

The research status and development trend of additive manufacturing technology

Fracture propagation and induced strain response during supercritical CO2 jet fracturing

Drilling performance analysis of impregnated micro bit

Research on Cutter Surface Shapes and Rock Breaking Efficiency Under High Well Temperature

Prediction Method and Experimental Study of Cone/Bit Speed Ratio of Roller Cone Bit