Ductile fracture behavior of low carbon high strength steel using continuum damage mechanics

Abstract

In this paper ductile fracture of low carbon high strength steel is estimated following the phenomenological approach of continuum damage mechanics (CDM) evolved by Lemaitre. This assumes damage, corresponding to void growth and their coalescence during large deformation, to be isotropic and ductile in nature. The CDM formalism allows estimating the ductile behavior by a damage variable D. This is evaluated from elastic modulus degradation measurement of uniaxial tensile tests with loading–unloading cycles. The result obtained in terms of DC, the critical value of damage, is found to be 0.44. This gives a measure of ductile fracture from the CDM approach. Respective average D values corresponding to every elastic modulus degradation estimate are used for simulation of ductile behavior of the material. The simulation result closely approximates the experimental flow curve up to about 15 % of strain with minor deviation beyond this strain level up to fracture. The method shown provides a way to evaluate ductile behavior of a material conveniently.

Ductile Behaviour Characterization of Low Carbon Steel: a CDM Approach

“…Beyond this point, the curve deviates due to unpredictable change of triaxiality factor. A similar nature of flow curve is observable with AISI1090, AISI1045 and DP590 steels [15] and [16].…”

Phase‐field‐crystal study on deformation behavior of nanoscale monocrack system in the ductile‐to‐brittle transition region

“…7,8 Some materials are brittle and fragile, [9][10][11][12] whereas others are ductile and deformable. [13][14][15] However, brittleness and ductility can transform mutually under certain condition. [16][17][18] The ductile-to-brittle transition (DBT) is achieved at a characteristic temperature, which is called ductile-to-brittle transition temperature (DBTT).…”

“…In engineering practice, materials suffer from various types of fracture, such as cleavage, ductile fracture, rupture, and intergranular creep fracture . Some materials are brittle and fragile, whereas others are ductile and deformable . However, brittleness and ductility can transform mutually under certain condition .…”