A Continuum Damage Mechanics Model for the Static and Cyclic Fatigue of Cellular Composites

Diel, Sergej; Huber, Otto

doi:10.3390/ma10080951

Cited by 9 publications

(8 citation statements)

References 28 publications

(56 reference statements)

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“…Models for fatigue life prediction of composite materials using continuum damage mechanics have been put forward and discussed by authors such as Chaboche [88], Bhattacharya [89] or Diel [90]. Owen and Bishop 540 [31] concluded that Paris's law was applicable to the glass-fibre-reinforced composites.…”

Section: The Case Of Progressive Damage Modelsmentioning

confidence: 99%

State of the art in fatigue modelling of composite wind turbine blades

Rubiella

Hessabi

Fallah

2018

International Journal of Fatigue

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This paper provides a literature review of the most notable models relevant to the evaluation of the fatigue response of composite wind turbine blades. As wind turbines spread worldwide, ongoing research to maximize their lifetime -and particularly that of wind turbine blades -has increasingly popularized the use of composite materials, which boast attractive mechanical properties. The review first presents the wind turbine blade environment, before distributing fatigue models broadly between three categories: life-based failure criterion models, which are based on S-N curve formulations and constant-life diagrams to introduce failure criteria; residual property calculation models, which evaluate the gradual degradation of material properties; and progressive damage models, which model fatigue via the cycle-by-cycle growth of one or more damage parameters. These are then linked to current testing standards, databases, and experimental campaigns. Among the fatigue modeling approaches covered, progressive damage models appear to be the most promising tool, as they both quantify and qualify physical damage growth to a reasonable extent during fatigue. The lack of consensus and shortcomings of literature are also discussed, with abundant referencing.This review aims to provide an overview of the current methods, in comparison to the other ones and most prominent theories, through a critical viewpoint, so as to be constructive and conclusive. Despite the fact that the fatigue behaviour of metals are already well-developed and validated, their "conventional" fatigue models may not be applied to composites due to their high anisotropic and heterogeneous behaviour.The underlying aim is to identify new paths for future improvements and shed light on the most ambiguous 40 aspects of composite fatigue research, particularly in the evolving case of wind turbine applications. 70 account for such effects, as we shall see.As wind turbines increase in size, the edgewise fatigue loading becomes increasingly relevant for life prediction, as shown by Kensche [7]. In addition, the torsional eigenfrequency drops, with a risk that it may couple with lower bending modes, with disastrous consequences. Toward the trailing and leading edge of the blade structure, gravity increasingly dominates the stress and strains applied to the load-bearing structure in the 75 rotor plane. An alternating, cyclic stress emerges as a result, with mean stress almost null. Furthermore,

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Section: The Case Of Progressive Damage Modelsmentioning

confidence: 99%

State of the art in fatigue modelling of composite wind turbine blades

Rubiella

Hessabi

Fallah

2018

International Journal of Fatigue

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“…The cumulative damage variable D will be valued 1 when the specimen is destroyed, and calculate the maximum plastic strain ε p m and the cumulative plastic energy dissipation in the cyclic process, then the parameter λ can be obtained use Equation (3), so the value of λ can fitaccording to Equation (14) by the test data, and the fitting results are presented in Table 6. The parameters can be fitted according to Equations (8) and (9) by the results of low-cycle fatigue test.…”

Section: The Parameter λ Of Evolutionequation Of Damage Accumulationmentioning

confidence: 99%

“…In this condition, the welds under cyclic are prone to damage accumulation, which is observed to be a process that can cause immediate failure when the load is not large enough [13]. It should be pointed out that damage accumulation has such an important impact on the performance and service life of structure [14][15][16][17][18][19], and even several studies have focused on the damage detection of the construction structure and material [20][21][22][23][24], but there is little consideration of the weld damage accumulation in the study of seismic performance of steel tubular truss structure joints [25][26][27][28], and the difference of the constitutive relation between the welding material and base metal is often neglected. For instance, the research results of Wang [29] revealed that the welding material and its parent material of 304 L steel have different hardening laws and damage evolution laws under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

2018

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The weld form of intersecting joints in a steel tubular truss structure changes with the various intersecting curves. As the key role of joints in energy dissipation and seismic resistance, the weld is easy to damage, as a result the constitutive behavior of the weld is different from that of the base metal. In order to define the cumulative damage characteristic and study the constitutive behavior of welded metal with the influence of damage accumulation, low-cycle fatigue tests were carried out to evaluate overall response characteristics and to quantify variation of cyclic stress amplitude, unloading stiffness and energy dissipation capacity. The results show that the cyclic softening behavior of welding materials is apparent, however, the steel shows hardening behavior with the increase of cyclic cycles, while the cyclic stress amplitude, unloading stiffness, and energy dissipation capacity of the welding materials degenerate gradually. Based on the Ramberg–Osgood model and introducing the damage variable D, a hysteretic model of welding material with the effect of damage accumulation was established, including an initial loading curve, cyclic stress-strain curve, and hysteretic curve model. Further, the evolution equation of D was also built. The parameters reflecting the damage degradation were fitted by the test data, and the simulation results of the model were proved to be in good agreement with the test results.

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“…For further details regarding cycle jumping and relevant application areas, see e.g. [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Procedures for handling computationally heavy cyclic load cases with application to a disc alloy material

Leidermark

Simonsson

2019

Materials at High Temperatures

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The computational efficiency in analysing cyclically loaded structures is a highly prioritised issue for the gas turbine industry, as a cycle-by-cycle simulation of e.g. a turbine disc is far too time consuming. Hence, in this paper, the efficiency of two different procedures to handle computational expansive load cases, a numerical extrapolation and a parameter modification procedure, are evaluated and compared to a cycle-by-cycle simulation. For this, a local implementation approach was adopted, where a user-defined material subroutine is used for the cycle jumping procedures with good results. This in contrast to a global approach where the finite element simulation is restarted and mapping of the solution is performed at each cycle jump. From the comparison, it can be observed that the discrete parameter modification procedure is by margin the fastest one, but the accuracy depends on the material parameter optimisation routine. The extrapolation procedure can incorporate stability and/or termination criteria.

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A Continuum Damage Mechanics Model for the Static and Cyclic Fatigue of Cellular Composites

Cited by 9 publications

References 28 publications

State of the art in fatigue modelling of composite wind turbine blades

State of the art in fatigue modelling of composite wind turbine blades

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

Procedures for handling computationally heavy cyclic load cases with application to a disc alloy material

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