Anisotropic cyclic plasticity modeling for additively manufactured nickel‐based superalloys. Issue 8 (6th June 2022)

• Record Type: Journal Article
• Authors: Jin, Shengzhe; Sun, Jingyu; Yuan, Huang
• Is Part Of: Fatigue & fracture of engineering materials & structures. Volume 45:Issue 8(2022)
• Page Start: 2371
• Page End: 2387
• Publication Date: 2022-06-06
• Subjects: anisotropy -- cyclic plasticity -- fatigue -- multiaxial loading -- selective laser melting (SLM); Materials -- Fatigue -- Periodicals; Fracture mechanics -- Periodicals; 620.1123
• DOI: 10.1111/ffe.13752
• Languages: English
• ISSNs: 8756-758X

Abstract

Abstract: The additively manufactured materials show anisotropic mechanical properties. In the present paper, a constitutive model for a nickel‐based superalloy made by selective laser melting was established to characterize cyclic mechanical behaviors under multiaxial loading conditions. Detailed material tests revealed that the effects from the building orientation decrease with multiaxial cyclic loads. A cyclic constitutive model based on the Hill criterion was introduced for the superalloy and considered the orthotropic mechanical properties depending on loading cycles. The computation confirms the model can reasonably simulate the cyclic elastic‐plastic behavior under non‐proportional complex loading conditions and provides an applicable method for engineering applications. Highlights: An anisotropic cyclic plasticity model was developed based on the Hill yield criterion and Ohno‐Wang model. Detailed material testing confirmed isotropic mechanical properties in the building plane but orthogonal in the building direction. The anisotropy of both elastic and plastic mechanical properties reached 10%. The developed constitutive model reasonably agrees with multiaxial cyclic test results.