Primary Processing Parameters and Their Influence on Porosity and Fatigue Life of Additively Manufactured Alloy 718
Abstract
This effort explores the influence of four key process parameters and scan strategies on the formation and characteristics of porosity distributions in additive manufacturing (AM) material. Then, based on the porosity distributions observed via nondestructive inspection techniques, a crack-growth based life prediction method was developed to accurately predict fatigue lives of AM components. Additionally, fatigue limit models were modified based on experimental data to explore the interactions of defect size and applied stress with respect to both finite and infinite fatigue life which enables defect tolerant design for components manufactured via AM. Finally, a novel compliance-based method for crack initiation detection was developed and used to assess some of the assumptions made in prior investigations. The connections made through the work presented herein link AM processing to potential design requirement which will facilitate faster, safer design efforts for implementation of AM components into structurally critical applications.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2020
- Accession Number
- AD1156522
Entities
People
- Luke Sheridan
Organizations
- Air Force Research Laboratory