scholarly journals Nonlocal damage modelling for finite element simulations of ductile steel sheets under multiaxial loading

PAMM ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Marvin Nahrmann ◽  
Anton Matzenmiller
Keyword(s):  
Finite Element ◽  
Finite Element Simulations ◽  
Multiaxial Loading ◽  
Nonlocal Damage ◽  
Steel Sheets ◽  
Damage Modelling ◽  
Ductile Steel

scholarly journals Modelling of Size Effect with Regularised Continua

10.14311/612 ◽  
2004 ◽  
Vol 44 (5-6) ◽  
Author(s):  
H. Askes ◽  
A. Simone ◽  
L. J. Sluys
Keyword(s):  
Finite Element ◽  
Size Effect ◽  
Size Effects ◽  
Finite Element Simulations ◽  
Nonlocal Damage ◽  
Three Point Bending ◽  
Nominal Strength ◽  
Model Size ◽  
Numerical Finite Element

A nonlocal damage continuum and a viscoplastic damage continuum are used to model size effects. Three-point bending specimens are analysed, whereby a distinction is made between unnotched specimens, specimens with a constant notch and specimens with a proportionally scaled notch. Numerical finite element simulations have been performed for specimen sizes in a range of 1:64. Size effects are established in terms of nominal strength and compared to existing size effect models from the literature. 

Design of an Experimental Device for Biaxial Tension Tests Used in a Uniaxial Test Machine

2013 ◽  
Vol 554-557 ◽  
pp. 174-181
Author(s):  
Heng Kuang Tsai ◽  
Yi Wei Lin ◽  
Fuh Kuo Chen ◽  
Shi Wei Wang
Keyword(s):  
Finite Element ◽  
High Strength Steel ◽  
Biaxial Tension ◽  
High Strength ◽  
Finite Element Simulations ◽  
Advanced High Strength Steel ◽  
Steel Sheets ◽  
Biaxial Stretching ◽  
Tension Tests ◽  
Sliding Mechanism

In the present study, a set of novel clamping apparatus that could deliver biaxial stretching motions with the use of a uniaxial tensile testing machine was designed and manufactured. The conversion of uniaxial motion into biaxial stretching motions is achieved by a sliding mechanism that consists of two blocks sliding in two mutually perpendicular grooves, respectively. During the biaxial tension test, a cross-shaped specimen sitting in the grooves are stretched by the two blocks driven by a pulling rod. The different stress ratios could be obtained by adjusting the groove surface shape and the lengths of specimen wings. In the clamping apparatus design stage, the finite element simulations were performed to examine the validity of the sliding mechanism and the frictional force generated between the sliding blocks and the grooves. The coefficient of friction was determined afterwards from the comparison of the pulling forces obtained in the experiments with those calculated by the finite element simulations. In addition, the optimum geometry and dimension of the cross-shaped specimen used in the biaxial tension tests were investigated by the finite element analysis as well. The slotted specimen proposed by Kuwabara et al. was taken as the basic design. A sufficiently large area in the central region of specimen where the principal stress directions aligned with the groove direction was obtained for gluing the strain gauges to the specimen for the biaxial stretching tests. The number of slots and associated slot widths were also examined to optimize the shape of the specimens. The proposed clamping apparatus was manufactured and the biaxial tension tests were conducted with cross-shaped specimens made of advanced high strength steel sheets. The validity of the designed clamping apparatus used for biaxial tension tests was confirmed and the congruence of various yield criteria applied to the advanced high strength steel sheets subjected to biaxial stress states was discussed.

Nonlocal Damage Modeling of Solder Joint Failure Under Thermomechanical Cyclic Loading

2021 ◽  
Author(s):  
Youssef Maniar ◽  
Alexander Kabakchiev ◽  
Marta Kuczynska ◽  
Masoomeh Bazrafshan ◽  
Peter Binkele ◽  
...  
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Solder Joint ◽  
End Of Life ◽  
Damage Evolution ◽  
Life Prediction ◽  
Finite Element Simulations ◽  
Automotive Electronics ◽  
Localization Algorithm ◽  
Nonlocal Damage

Abstract The increasing electrified mobility poses a challenge on reliability prediction of automotive electronics, especially when safety systems are concerned. The use of finite element simulation for accurate end-of-life prediction of automotive electronic devices under harsh environmental loading condition is getting increasingly significant. In particular, solder interconnection failure is in focus when subjected to thermomechanical loads. During cyclic loading, the initial deformation behavior and subsequent solder degradation can be modeled within finite element simulations using material damage coupled deformation models. Such models employ the calculation of an internal damage state variable at integration point level as functions of time, temperature and governing stress-strain state. In this work, a thermodynamic consistent implicit nonlocal damage formulation is presented. This modeling approach allows absolute end-of-life prediction of different solder joint geometries under thermomechanical cyclic loading within finite element simulations. The presented nonlocal damage model consists of damage evolution with strain and stress state dependencies, such as stress multiaxiality. Furthermore, a numerical de-localization algorithm is proposed, in order to avoid instability of damage evolution caused by finite element mesh dependency. Finally, the advantages and implications of the nonlocal damage approach are discussed based on simulations of damage evolution in multiple solder joints of a QFN48 package under combined cyclic thermal and mechanical 4-point bending loading.

Nonlocal damage modelling by the scaled boundary finite element method

2019 ◽  
Vol 99 ◽  
pp. 29-45 ◽  
Author(s):  
Zihua Zhang ◽  
Yan Liu ◽  
Dilina Dyon Dissanayake ◽  
Albert A. Saputra ◽  
Chongmin Song
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlocal Damage ◽  
Damage Modelling ◽  
Scaled Boundary Finite Element ◽  
Element Method

Behaviour of Axially Loaded Composite Wall Panel by Using Finite Element Analysis

2015 ◽  
Vol 815 ◽  
pp. 49-53
Author(s):  
Nur Fitriah Isa ◽  
Mohd Zulham Affandi Mohd Zahid ◽  
Liyana Ahmad Sofri ◽  
Norrazman Zaiha Zainol ◽  
Muhammad Azizi Azizan ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Structures ◽  
Element Analysis ◽  
Steel Sheets ◽  
Linear Behavior ◽  
Non Linear ◽  
Composite Wall ◽  
Experimental Values ◽  
Civil Engineering Infrastructure

In order to promote the efficient use of composite materials in civil engineering infrastructure, effort is being directed at the development of design criteria for composite structures. Insofar as design with regard to behavior is concerned, it is well known that a key step is to investigate the influence of geometric differences on the non-linear behavior of the panels. One possible approach is to use the validated numerical model based on the non-linear finite element analysis (FEA). The validation of the composite panel’s element using Trim-deck and Span-deck steel sheets under axial load shows that the present results have very good agreement with experimental references. The developed finite element (FE) models are found to reasonably simulate load-displacement response, stress condition, giving percentage of differences below than 15% compared to the experimental values. Trim-deck design provides better axial resistance than Span-deck. More concrete in between due to larger area of contact is the factor that contributes to its resistance.

Thermomechanical finite element simulations of ultrasonically assisted turning

2005 ◽  
Vol 32 (3-4) ◽  
pp. 463-471 ◽  
Author(s):  
A.V. Mitrofanov ◽  
V.I. Babitsky ◽  
V.V. Silberschmidt
Keyword(s):  
Finite Element ◽  
Finite Element Simulations
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