Characterization of mechanical properties by indentation tests and FE analysis – validation by application to a weld zone of DP590 steel

Abstract

a b s t r a c tIn this work, the mechanical properties of the metal active gas (MAG) weld zone and heat affected zone (HAZ) were characterized utilizing the continuous indentation method together with its finite element (FEM) analysis. To verify the measured properties, uni-axial tension and three point bending tests were performed for DP590 welded specimens. For numerical simulations, the isotropic hardening law was assumed along with the non-quadratic anisotropic yield function, Yld2000-2d. As for the failure criterion of the base material and weld zones particularly for the failure evaluation in the uni-axial tension test, Hill's bifurcation theory and the M-K theory were applied to calculate the forming limit diagrams considering all measured properties including strain-rate sensitivity.

Macro-performance evaluation of friction stir welded automotive tailor-welded blank sheets: Part II – Formability

“…As the hardness distribution measured across the weld zone shown in Fig. 6(b) suggests, HAZ is weaker than the rest, promoting the strain localization in this region (Park et al, 2007;Chung et al, 2009). Note that the stress in the weld zone is large enough to compensate the loss in thickness so that its strength is larger than the rest.…”

“…8(a) (Gan et al, 2008) and also by Agarwal et al (2007). Since a uniform property along the weld zone was assumed in this work, the simulation could not predict the biased failure location, suggesting that more refined property distribution as done by Chung et al (2009) is needed for more accurate prediction of the failure location inside the weld zone. For the Type-III specimen, the experimental failure seemingly initiated in the weld zone on the retreating side and then propagated along the advancing side of the weld zone.…”

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

“…[17][18][19] The 3 most common techniques to extract material properties from instrumented indentation data are the representative strain method, [20,21] iterative FEA, [19,22] and artificial neural networks (ANN). [23] The ANN technique is beyond the scope of this paper and will not be discussed.…”

Three-point bending tests-Part I: Mathematical study and asymptotic analysis

“…Moreover, n = (0, 0, ±1) on ± . Lateral boundary l is partitioned into three non-empty, open and disjointed parts C , N 1 and N 2 satisfying¯ l =¯ C ∪¯ N 1 ∪¯ N 2 , where…”