Ductile fracture: Experiments and computations

Li, Hengyun; Fu, Ming; J, Lu; Yang, He

doi:10.1016/j.ijplas.2010.04.001

Cited by 442 publications

(212 citation statements)

References 55 publications

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“…For this sample, first, the influence of the loading rate has eliminated by making the rate sensitivity parameter zero. Parameters of the model are shown in Table 2 (physical coefficients are directly acquired from Lie et al [42]). The resulting force displacement response obtained from the rate-independent model is compared with those presented by Miehe et al [18] and Lie et al [42] ( Figure 4).…”

Section: V-notched Samplementioning

confidence: 99%

A Phase Field Model for Rate-Dependent Ductile Fracture

Badnava¹,

Etemadi

Msekh

2017

Metals

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Abstract:In this study, a phase field viscoplastic model is proposed to model the influence of the loading rate on the ductile fracture, as one of the main causes of metallic alloys' failure. To this aim, the effects of the phase field are incorporated in the Peric's viscoplastic model; the model can efficiently be converted to a standard rate-independent model. The novel aspects of this work include: Describing a coupling between rate-dependent plasticity and phase field formulation by defining an energy function that contains the energy dissipation caused by plastic deformation as well as the fracture process and elastic energy. In addition, the equations required to develop the numerical solution are presented. The governing equations are determined by a minimization principle that results in balance laws for the coupled displacement-phase field problem. Furthermore, an implicit integration algorithm for a viscoplasticity model coupled with a phase field is presented for a three-dimensional stress state. The proposed algorithm can be utilized for different constitutive models of rate-dependent and rate-independent plasticity models coupled with fracture by changing the definition of the plastic multiplier. In addition, to control the influence of the plastic deformation and its work on the crack propagation, a threshold variable is defined in the model. Finally, using the proposed model, the influence of the loading rate on the responses of the different specimens in one-dimensional and multi-dimensional cases is investigated and the accuracy of the results was verified by comparing them with existing experimental and numerical results. The obtained result proves that the model can simulate the impact of the loading rate on the material response, and the gradual change of the fracture phase from ductile to brittle, caused by increasing the loading rate.

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Section: V-notched Samplementioning

confidence: 99%

A Phase Field Model for Rate-Dependent Ductile Fracture

Badnava¹,

Etemadi

Msekh

2017

Metals

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“…Usually = 2 (Li et al (2011), Rousselier (1987 and Rousselier (2001)). The damage variable for modified Rousselier damage model is obtained as follows: …”

Section: Modified Rousselier Damage Modelmentioning

confidence: 99%

“…Another common damage model in this field is Gurson-Tvergaard and Needleman or GTN model which is used for description of growth and expansion of pores in soft metals, several researchers have used GTN damage model in their researchs, for example Gurson et al (1977), , Tvergaard and Needleman (1984) and . Li et al (2011) showed that the use of damage criterion for soft metals depends on damage expansion equation and consideration of suitable parameters such as load and so forth. Rousselier (1987 and2001) published the damage model later based on continuum mechanics theory.…”

Section: Introductionmentioning

confidence: 99%

Studying energy absorption in tapered thick walled tubes

Tehrani

Ferestadeh

2015

Lat. Am. j. solids struct.

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In many engineering structures different energy absorption systems may be used to improve crashworthiness capability of the system and to control damages that may occur in a system during an accident. Therefore, extensive research has been done on the energy-absorbing cells. In this paper, energy absorption in tapered thick walled tubes has been investigated. As a practical case, studies have been focused on the crush element of Siemens ER24PC locomotive. To investigate performance of this part at collision time, it has been modeled in Abaqus software and its collision characteristics have been evaluated. Considering that the crash element is folded at time of collision, an analytical approach has been presented for calculation of instantaneous folding force under axial load. Basis of this method is definition and analysis of main folding mechanism and calculation of average folding force. This method has been used for validation of the results of numerical solution. Since sheet thickness of the crash element is high and may be ruptured at time of collision, some damage models have been used for numerical simulations. One of the three damage models used in this paper is available in the software and coding has been done for two other damage models and desirable damage model has been specified by comparing results of numerical solution with results of laboratory test. In addition, authenticity of the desirable damage model has been studied through ECE R 66 standard. To improve crashworthiness characteristic some attempts, such as use of metal foam and creation of trigger in suitable situations to reduce maximum force resulting from collision, have been performed. Finally though different simulation optimal crush element has been introduced and its performance and efficiency have been evaluated.

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“…Critical values of the nCL criteria and differences between data calculated from laboratory compression test and numerical simulations are shown in Fig. 4 [23] where a critical value of the nCL criterion was established at 0.3. Besides, authors [24] were involved in the study of EN AW 6082 subjected to ECAP (equal channel angular pressing).…”

Section: Fig 2 Compressive Stress -Strain Curvesmentioning

confidence: 99%

Physical and Numerical Determination of Workability in Aluminium Alloys

Kováčová¹,

Kvačkaj²,

Kočiško³

et al. 2014

Acta Metall Slovaca

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To prevent any failure or fracture in materials during a forming process, the study of material workability is a crucial task. In this paper, the workability of two different aluminium alloys was described through Cockcroft -Latham ductile fracture criteria and forming limit diagrams. Moreover, the experiments have been carried out using compression tests and finite element methods and there was able to compare and verify the physical and numerical approaches. According to the results, there was found out that physical and numerical models are advantageous tools to describe the material workability during forming processes and the optimal data are obtained when both approaches are working together.

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Ductile fracture: Experiments and computations

Cited by 442 publications

References 55 publications

A Phase Field Model for Rate-Dependent Ductile Fracture

A Phase Field Model for Rate-Dependent Ductile Fracture

Studying energy absorption in tapered thick walled tubes

Physical and Numerical Determination of Workability in Aluminium Alloys

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