Damage modeling in Small Punch Test specimens. (December 2016)

• Record Type: Journal Article
• Authors: Martínez-Pañeda, E.; Cuesta, I.I.; Peñuelas, I.; Díaz, A.; Alegre, J.M.
• Is Part Of: Theoretical and applied fracture mechanics. Volume 86:Part A(2016)
• Page Start: 51
• Page End: 60
• Publication Date: 2016-12
• Subjects: Small Punch Test -- Fracture toughness -- Ductile damage -- Finite element method; Fracture mechanics -- Periodicals; 620.1126
• DOI: 10.1016/j.tafmec.2016.09.002
• Languages: English
• ISSNs: 0167-8442

Abstract

Highlights: Ductile damage modeling within the SPT is thoroughly investigated. The role of the notch profile is assessed from both triaxiality and notch fabrication perspectives. A novel methodology is presented to identify GTN parameters from the SPT curve. Damage nucleation and growth mechanisms are extensively examined. Ductile damage predictions reveal a very good agreement with experiments. Abstract: Ductile damage modeling within the Small Punch Test (SPT) is extensively investigated. The capabilities of the SPT to reliably estimate fracture and damage properties are thoroughly discussed and emphasis is placed on the use of notched specimens. First, different notch profiles are analyzed and constraint conditions quantified. The role of the notch shape is comprehensively examined from both triaxiality and notch fabrication perspectives. Afterwards, a methodology is presented to extract the micromechanical-based ductile damage parameters from the load-displacement curve of notched SPT samples. Furthermore, Gurson-Tvergaard-Needleman model predictions from a top-down approach are employed to gain insight into the mechanisms governing crack initiation and subsequent propagation in small punch experiments. An accurate assessment of micromechanical toughness parameters from the SPT is of tremendous relevance when little material is available.