Diğer Yayınlar Koleksiyonu
https://hdl.handle.net/11421/22611
2024-03-29T04:42:19ZSystematical Review on the Numerical Simulations of Laser Powder Bed Additive Manufacturing
https://hdl.handle.net/11421/22770
Systematical Review on the Numerical Simulations of Laser Powder Bed Additive Manufacturing
Kuşhan, Melih Cemal; Poyraz, Özgür; Uzunonat, Yagız; Orak, Sezan
Additive manufacturing technologies, depending on melting of metal powder particles layer upon layer for building 3D functional objects, have widened their application area within biomedical, automotive, aerospace and die/mold industries. Along with the increased application of additive manufacturing, a better understanding of different aspects for the technique has become necessary to fulfill the high demands of quality and productivity. One of the significant process limits of additive manufacturing technologies are residual stresses induced by heating the fine metal powder to the melting point and sudden cooling to the initial temperature. Process simulations performed in a computer environment is of critical importance to predict and to prevent this risk. This paper represents a systematical literature review on the numerical simulations of laser powder bed fusion additive manufacturing. It covers the background and development of analytical models with the contributions of previous ones used for traditional manufacturing techniques such as welding. The details of the numerical modeling studies are provided for thermal and mechanical analysis with the arrangements and assumptions made to reduce the simulation times. Application features are also referred like part material, part size, validation case and the software used for simulations. As a result of these, gap analysis are conducted, needs are established and future research opportunities are expressed.
WOS: 000454526700019
2018-01-01T00:00:00ZShear thickening fluids in protective applications: A review
https://hdl.handle.net/11421/22757
Shear thickening fluids in protective applications: A review
Gürgen, Selim; Kuşhan, Melih Cemal; Li, Weihua
A thorough and critical review on Shear Thickening Fluids (STFs) is presented based on a literature survey. The rheological properties of STFs are discussed considering many factors affecting shear thickening behavior and the use of STFs in protective systems is reviewed. The main focus of this review is multiphase STF5, relatively new to the literature (in the last five years). Multi-phase STF5 include a second phase in suspensions and the influences of this additional phase on rheological behavior and protective applications are discussed extensively. Based on this extended review, STF do benefit protective applications, but the major contribution is not driven by the shear thickening behavior. Rather, STFs are responsible for the increase in friction along fabrics and enhanced fiber/yarn coupling in fabric based protective systems. As a result, of these effects, the load transfer is spread over a wider area and penetration depth is lowered in an impacted structure
WOS: 000417668900003
2017-01-01T00:00:00Z