Experimental and Computational Study of Ductile Fracture in Small Punch Tests

GÜLÇİMEN ÇAKAN B., Soyarslan C., Bargmann S., Hahner P.

MATERIALS, cilt.10, sa.10, 2017 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 10 Sayı: 10
  • Basım Tarihi: 2017
  • Doi Numarası: 10.3390/ma10101185
  • Dergi Adı: MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: small punch test, P91 steel, ductile fracture, gurson's plasticity model, nonlocal plasticity, SCALE YIELDING CONDITIONS, CRACK-GROWTH, NONLOCAL DAMAGE, VOID NUCLEATION, NEURAL-NETWORKS, P91 WELDMENT, SHEAR, DEFORMATION, TOUGHNESS, FAILURE
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

A unified experimental-computational study on ductile fracture initiation and propagation during small punch testing is presented. Tests are carried out at room temperature with unnotched disks of different thicknesses where large-scale yielding prevails. In thinner specimens, the fracture occurs with severe necking under membrane tension, whereas for thicker ones a through thickness shearing mode prevails changing the crack orientation relative to the loading direction. Computational studies involve finite element simulations using a shear modified Gurson-Tvergaard-Needleman porous plasticity model with an integral-type nonlocal formulation. The predicted punch load-displacement curves and deformed profiles are in good agreement with the experimental results.