Composite fatigue design methodology: a simplified approach

Nyman, Tonny

doi:10.1016/0263-8223(96)00032-3

Cited by 30 publications

(19 citation statements)

References 25 publications

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“…The material constants (α, β, δ, φ, and γ) appeared in these equations may be determined through calibrations based on the unidirectional fatigue tests, at arbitrary R ratios. The same procedure may be implemented to Equations (27) to (30) as well. The same procedure may be implemented to Equations (27) to (30) as well.…”

Section: Development Of the Equivalentstress-based Criterionmentioning

confidence: 99%

“…To save space, the procedure is explained here for Equation (26), only. The same procedure may be implemented to Equations (27) to (30) as well. Based on the mentioned tests, the following limit conditions may be defined: σ a1 = X a1 ,σ 2 ,σ 3 ,τ 12 , τ 13 ,τ 23 = 0 : σ eff À Á a = σ a1 = X a1 N σ1 , R σ1 ð Þ σ 1 , σ 3 ,τ 12 ,τ 13 ,τ 23 = 0,σ a2 = X a2 : σ eff À Á a = ασ a2 = α X a2 N σ2 ,R σ2 ð Þ σ 1 , σ 2 ,τ 12 ,τ 13 ,τ 23 = 0,σ a3 = X a3 : σ eff À Á a = βσ a3 = β X a3 N σ3 ,R σ3 ð Þ σ 1 , σ 2 ,σ 3 ,τ 13 ,τ 23 = 0,τ 12a = 12a : σ eff À Á a = δτ 12a = δ 12a N τ12 , R τ12 ð Þ σ 1 , σ 2 ,σ 3 ,τ 12 ,τ 23…”

Section: Development Of the Equivalentstress-based Criterionmentioning

confidence: 99%

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Generalized 3D high cycle fatigue criteria for multiscale bridging‐based progressive damage analysis of multilayer composite parts under random loads and material deterioration

Shariyat

Rahimi‐Ghozat

2019

Fatigue Fract Eng Mat Struct

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Two frameworks are employed to develop two distinct categories of multiaxial high cycle fatigue life assessment models for composite components experiencing general and random loading conditions. In this regard, the decay in the material properties with cycles is also taken into account. It is obvious that in multilayer components, the fatigue failure is a progressive process that may be accompanied by gradual or sudden changes in the material properties and, consequently, the resulting stresses. In addition to using the traditional progressive damage analyses, a new concept is proposed for tracing of the localized fatigue failures more accurately. It is postulated that generally, the stress components have distinct frequencies, phase shifts, and mean values that all vary with time in a random manner. The proposed fatigue criteria, especially, the equivalent-stress-based ones, are capable of predicting various fatigue failure modes, such as the fibre breakage, matrix cracking, and interfacial debonding. A special and comprehensive fatigue failure tracking and cycle counting algorithms that are capable of handling the mentioned general peculiarities are proposed. The proposed HCF criteria and the relevant fatigue life assessment algorithm are then implemented on a composite multilayer monoleaf spring of a realistic vehicle under a random field-measured loading condition, as a typical component, and the results are compared and the experimental results conducted by the authors, for accuracy investigations. The considered stochastic road inputs have been chosen on the basis of the consumption times and field measurements. K E Y W O R D Scomposite mono-leaf spring, deterioration of the material, experimental results, new 3D HCF criteria, progressive fatigue-damage, realistic random load inputs

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Section: Development Of the Equivalentstress-based Criterionmentioning

confidence: 99%

Section: Development Of the Equivalentstress-based Criterionmentioning

confidence: 99%

Generalized 3D high cycle fatigue criteria for multiscale bridging‐based progressive damage analysis of multilayer composite parts under random loads and material deterioration

Shariyat

Rahimi‐Ghozat

2019

Fatigue Fract Eng Mat Struct

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“…Fatigue failures occurred under fatigue testing conducted at the 73% of CAI strength, which agrees with the data described in some reports. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Weibull statistics were adopted for fatigue lifetime distribution under the same peak compressive stress S min . [11,18,21]…”

Section: Cai Fatigue Strength Distributionsmentioning

confidence: 99%

Fatigue behavior and lifetime distribution of impact-damaged carbon fiber/toughened epoxy composites under compressive loading

Ogasawara

Sugimoto

Katoh

et al. 2013

Advanced Composite Materials

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This paper presents fatigue lifetime data of impact-damaged carbon fiber/toughened epoxy composites under compressive loading to elucidate the lifetime prediction methodology based on statistical approaches. Drop-weight impact damage was induced to a composite specimen with impact energy of 6.7 J/mm in accordance with ASTM D7136. Postimpact fatigue tests were conducted using a test fixture defined in ASTM D7137 under compression-compression loading (R = 10) at room temperature. The maximum compressive stress (S min ) was 200, 210, 220, 230, and 240 MPa, and the total number of specimens was 31. The compression-after-impact strength and fatigue lifetime show considerable scattering. This result is apparently derived from the variation in impact damage size. A simple statistical model based on the weakest link theory was proposed for predicting the lifetime of impact-damaged composite laminates. Results show that the experimentally obtained data were confirmed consistently using this model. The ratio between the endurance limit at 10 6 and 10 7 cycles and the initial static strength was estimated as 0.74 and 0.68 as B-basis allowable values.

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“…Seyyedvahid et al [33] studied the material's behaviour of the composites which are affected by the orientation of each layer. Another study by Nyman T. [34] focused on the test approach of the difference between multidirectional and unidirectional composites behaviour in every new lay-up. Another study done by A. Bernasconi et al [35] showed that the different orientation of reinforcing fibre affects the development of damage mechanisms, whereby if more fibre is aligned parallel to the loading direction, less damage will accumulate during fatigue life, and less stiffness degradation will subsequently occur.…”

Section: Introductionmentioning

confidence: 99%

Study on fatigue life and fracture behaviour of fibreglass reinforced composites

Zakaria¹,

Jimit²,

Ramli³

et al. 2016

J. MECH. ENG. SCI.

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The material used in vehicle parts could significantly affect the vehicle efficiency. Fibreglass reinforced composites are among the materials that can be used to manufacture the components due to their excellent lightweight properties. Composite structures may undergo fatigue failure when subjected to a certain number of cyclic loading, which normally occurs below the ultimate strength of the material. However, studies on this material's behaviour remain lacking, including on its integrity under fatigue loading. This paper aims to emphasize a study on the effect of fibre orientation on fatigue strength of fibreglass reinforced composites (FGRC), which are [±45°] and [0/90°]. The composite is fabricated from unidirectional glass fibre and epoxy resin using a hand lay-up technique. The experimental test is carried out at room temperature according to ASTM D3039 for tensile test at rate 5mm/min and ASTM D3479 for fatigue test at R=0.1 subjected to constant amplitude loadings. The results were presented in the form of S-N curves, showing that [0/90°] orientation has a higher fatigue strength as a function of fibre orientation. The results show that the mechanical properties and fatigue behaviour were significantly affected by the fibre orientation of the FGRC.

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Composite fatigue design methodology: a simplified approach

Cited by 30 publications

References 25 publications

Generalized 3D high cycle fatigue criteria for multiscale bridging‐based progressive damage analysis of multilayer composite parts under random loads and material deterioration

Generalized 3D high cycle fatigue criteria for multiscale bridging‐based progressive damage analysis of multilayer composite parts under random loads and material deterioration

Fatigue behavior and lifetime distribution of impact-damaged carbon fiber/toughened epoxy composites under compressive loading

Study on fatigue life and fracture behaviour of fibreglass reinforced composites

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