MML [MML] Prof. F. Barlat: Calibration of Distortional Plasticity Framework and Application to U-draw Be…
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댓글 0건 조회 512회 작성일 2021-08-25 13:18
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A new version of a distortional plasticity framework, the so-called homogeneous anisotropic hardening
(HAH), was investigated regarding its calibration and its application to the numerical analysis of the U-draw
bend test. First, the mechanical properties of a dual-phase steel sheet sample, DP780, were characterized
using uniaxial tension, bulge and elastic loading-unloading tests to provide the data for the calibration of
a conventional constitutive description assuming isotropic hardening. Then, tension-compression with different
load reversal numbers and two-step tension tests were performed to produce strain path changes
that lead to anisotropic hardening effects. The coefficients of this new model, called HAH20, were determined
with an optimization procedure. Several sets of coefficients were identified depending on the
number of reversals considered in tension-compression. U-draw bend test simulations were also carried
out to validate the HAH20 model and its implementation in a finite element code, to compare the results
with an older version of the HAH model family, and to assess the influence of the input data used in the
coefficient calibration. In addition, the influence of the cross-loading effect on the U-draw bending predictions
was examined. The main conclusion of this work is that the HAH20 coefficients calibrated for the
description of reverse loading depend on the number of reversals during the tension-compression tests.
The results of the U-draw bending simulations indicate that this dependence may lead to significant differences
in the predicted amounts of springback.
KEY WORDS: sheet metal forming; non-proportional loading; material characterization; coefficients identification;
homogeneous anisotropic hardening; U-draw bending; springback.
관련링크
- 이전글[MML]Prof.Frederic Barlat : Investigation of Elastic Modulus Degradation and Recovery with Time and Baking Process for Deformed Automotive Steel Sheets 22.08.04
- 다음글[MML] Prof. F. Barlat: Performance review of various uncoupled fracture criteria for TRIP steel sheet 21.08.25
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