Modelling of strain softening materials based on equivalent damage force

Vignjević, Rade; Djordjevic, Nenad; Vuyst, Tom De; Gemkow, S

doi:10.1016/j.cma.2018.01.049

Cited by 34 publications

(13 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The phase maps in Figures 5-7 with the flexural waves propagation will be used as one of several validation ways for the new numerical and analytical models developing within the EXTREME project 2,3,32 . For composites, this information about the early response may supplement the failure modes analysis (fibre or matrix fracture, delamination, plasticity).…”

Section: Discussionmentioning

confidence: 99%

“…The development of new instruments to reconstruct extreme dynamic events and to measure failure parameters will provide important insight into the understanding of the behaviour of composites. The strain development during the impact is of particular interest for both materials modelling and testing researchers 2,3 . The shearography [4][5][6] (speckle pattern shearing interferometry) technique is used in this project as it provides a quantitative measurement of the surface strain components with a high sensitivity as a non-contact interferometric technique.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

EXTREME shearography: development of a high-speed shearography instrument for measurements of the surface strain components during an impact event

Anisimov¹,

Groves

2018

Speckle 2018: VII International Conference on Speckle Metrology

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

EXTREME shearography: development of a high-speed shearography instrument for measurements of the surface strain components during an impact event

Anisimov¹,

Groves

2018

Speckle 2018: VII International Conference on Speckle Metrology

View full text Add to dashboard Cite

show abstract

“…It has been mentioned in previous publications that the cutting of Ti-6Al-4V generally produces segmented chips even at relatively low cutting speeds [14,15]. It can be understood that when the strain softening phenomenon occurs, the material strength decreases as the strain increases [37]. After achieving the maximum level at 18 N, the cutting force pattern in the TC process then declines after it loses its material strength.…”

Section: Cutting Forcementioning

confidence: 93%

Analytical, FEA, and experimental research of 2D-Vibration Assisted Cutting (2D-VAC) in titanium alloy Ti6Al4V

Kurniawan

Ahmed

Ali

et al. 2021

Int J Adv Manuf Technol

View full text Add to dashboard Cite

In the 2D-Vibration Assisted Cutting (2D-VAC) method, the cutting tool shakes in a 2-dimensional approach because of superimposed high-frequency modulation. This high-frequency modulation effect creates a displacement at a tiny scale of micrometers and causes an escalation in the resultant cutting speed. Consequently, 2D-VAC has superior advantages compared to traditional cutting (TC). This manuscript describes research on 2D-VAC that focuses on modeling cutting forces (mathematical model) and finite element analysis (FEA) results. The FEA results are focused on the von Mises stress, plastic strain, cutting force, cutting temperature, and residual stress. In addition, an experiment for the chip formation, microstructure layer, and micro-hardness was also analyzed in this study. According to the modeling results, the cutting force has a comparable pattern to the FEA results. The stress contour result confirms that the 2D-VAC method has lower stress than that in the TC method during tool retraction mode. Additionally, the plastic strain in the 2D-VAC method can be higher than that in the TC method. According to the temperature results, the peak temperature in the 2D-VAC could be higher than that in the TC method. The residual stress shows that there is a compressive effect. Thus, the compressive stress is higher than that in the TC method. Micro-hardness results confirmed that there is not too much change from the original surface in the 2D-VAC method. The result of micro-structure morphology also confirmed that there is a significant shear deformation flow in case of the TC method, although less occurs in the 2D-VAC method.

show abstract

“…The shear band dependency on the mesh size or density can be overcome by introducing intrinsic material length scale in conventional plasticity (Needleman, 1988;Voyiadjis and Al-Rub, 2005;Anand et al, 2012;Peerlings et al, 2002;Vignjevic et al, 2018;Kaiser and Menzel, 2019b) and in crystal plasticity (Petryk and Stupkiewicz, 2016;Ling et al, 2018;Kaiser and Menzel, 2019a). Furthermore, the difficulties in assessment of active slip systems within the crystal plasticity framework can be overcome by rate-dependent (Busso and Cailletaud, 2005) or rate-independent (Forest and Rubin, 2016;Kaiser and Menzel, 2019a) formulations.…”

Section: Introductionmentioning

confidence: 99%

Lagrange multiplier based vs micromorphic gradient-enhanced rate-(in)dependent crystal plasticity modelling and simulation

Scherer

Phalke

Besson

et al. 2020

Computer Methods in Applied Mechanics and Engineering

View full text Add to dashboard Cite

A reduced strain gradient crystal plasticity theory which involves the gradient of a single scalar field is presented. Rate-dependent and rate-independent crystal plasticity settings are considered. The theory is then reformulated following first the micromorphic approach and second a Lagrange multiplier approach. The finite element implementation of the latter is detailed. Computational efficiency of the Lagrange multiplier approach is highlighted in an example involving regularization of strain localization. The numerical performance improvement is shown to reach up to two orders of magnitude in computation time speedup. Then, size effects predicted by micromorphic and Lagrange multiplier based formulations of strain gradient plasticity are assessed. First of all numerical comparisons are performed on single crystal wires in torsion. Saturation of the size effects induced by the micromorphic approach and absence of saturation with the Lagrange multiplier approach when sample size is decreased are demonstrated. The Lagrange multiplier based formulation is finally applied to characterize size effects predicted for the ductile growth of porous unit-cells at imposed stress triaxiality. Excellent agreement with micromorphic results is obtained.

show abstract

Modelling of strain softening materials based on equivalent damage force

Cited by 34 publications

References 29 publications

EXTREME shearography: development of a high-speed shearography instrument for measurements of the surface strain components during an impact event

EXTREME shearography: development of a high-speed shearography instrument for measurements of the surface strain components during an impact event

Analytical, FEA, and experimental research of 2D-Vibration Assisted Cutting (2D-VAC) in titanium alloy Ti6Al4V

Lagrange multiplier based vs micromorphic gradient-enhanced rate-(in)dependent crystal plasticity modelling and simulation

Contact Info

Product

Resources

About