A New Approach for Stress State - Dependent Flow Localization Failure Bounded Through Ductile Damage in Dynamically Loaded Sheets

Journal of Solid Mechanics

مقاله 5، دوره 12، شماره 3، آذر 2020، صفحه 559-569   

نوع مقاله: Research Paper

شناسه دیجیتال (DOI): 10.22034/jsm.2019.1869860.1449

نویسندگان

F Hosseini Mansoub¹؛ A Basti^{* 2}؛ A Darvizeh²؛ A Zajkani³

¹Department of Mechanical Engineering, University Campus, University of Guilan, Rasht, Iran

²Department of Mechanical Engineering, University of Guilan, Rasht, Iran

³Department of Mechanical Engineering, Imam Khomeini International University, Qazvin, Iran

چکیده

In this paper, a new approach is proposed for stress state - dependent flow localization in bifurcation failure model bounded through ductile damage in dynamically loaded sheets. Onset of localized necking is considered in phenomenological way for different strain rates to draw the forming limit diagram (FLD). Using a strain metal hardening exponent in the Vertex theory related to the strain rate helps investigate rate- dependent metal forming limits. Besides, the paper utilizes the model of ductile damage as a function of strain condition, stress states (triaxiality and Lode parameters), and the symbols of stiffness strain to predict the onset of the necking. It is worth noting that updated level of elasticity modulus in the plastic deforming is attributed as an essential index for the ductile damage measuring. According to original formulations, a UMAT subroutine is developed in the finite element simulation by ABAQUS code to analyze and connect the related constitutive models. Results reveal that the FLD levels increase for St 13 material through enhancing the strain rate.

کلیدواژه‌ها

Ductile damage؛ Stress state؛ Strain rate؛ Forming Limit؛ Localized necking

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