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At least 307 records · Page 17
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

CHARACTERIZATION OF FATIGUE BEHAVIORS OF NOTCHED 316L DED AM SPECIMENS

ASME Codification of Additive Manufacturing • Integration of AM into ASME Codes and Standards • The ASME goal is to have AM requirements in ASME Code Cases preceding the 2025 Edition. • The ASME Special Committee on AM has drafted criteria for two Code Cases for Additive Manufacturing. • AM Construction of Pressure Equipment using the Direct Energy Deposition Process with Wire Feedstock. • Includes Gas Metal Arc Welding. • Time-independent material properties. • Status - Criteria endorsed by AM Committee. • AM Construction of Pressure Equipment using the Powder Bed Fusion AM Process. • Includes Laser and Electron Beam Energy Sources. • Austenitic and Nonferrous materials. • Time-independent material properties. • Status – Approval ballot circulating to the AM Committee.

Krentz, Timothy M.↗
NASA NTRS1971

Elasto-plastic analysis of a mode I edge crack with application to a surface notch.

A finite element analysis has been undertaken of the mechanical state of a plate containing a crack subjected to mode I loading. Specifically, a localized, well-defined surface depression (dimple) previously observed on the back surface of plate specimens immediately behind the plane of the crack was examined. The approach taken is concerned with defining more precisely the dimpling behavior as a function of relative flaw depth and applied stress level, as well as the development of the plastic zone at the crack tip.

Francis, P. H.↗
NASA NTRS1973

Digital notch filter

Filter determines whether time period of incoming signal matches time preset in filter. When signals do not match, high or low frequency deviation reading is displayed digitally.

Meers, B. Z., Jr.↗