Deflecting mode-I cracks in anisotropic materials

Judt, Paul; Zarges, Jan-Christoph; Feldmann, Markus; Ricoeur, Andreas; Heim, Hans-Peter

doi:10.1016/j.mechmat.2019.05.007

Cited by 19 publications

(27 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The CT-specimen design yields a mode-I crack tip loading (Φ = 0) and therefore in isotropic materials no crack deflection is expected during crack initiation. (1), dashed blue and solid red lines) and the extended MTS criterion ( [12], dashed pink and solid green lines) are shown. 1 the experimental crack deflection anglesφ d obtained at crack initiation during the CT-tests are plotted vs. the respective anisotropy ratiosχ of the composites.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…Due to symmetry of specimens and experimental set-up, there is no significance of the deflection of cracks into the upper or lower half of the specimen and therefore absolute values |φ d | are shown in the figure. It turns out that χ b depends on the interpolation exponent n and the employed crack deflection theory [12]. The markers shown in Fig.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…In preliminary studies [10][11][12] these composites were characterized regarding their anisotropic elastic and fracture behavior. Composite materials e.g.…”

Section: Theory Of Crack Deflection In Anisotropic Materialsmentioning

confidence: 99%

“…Two material systems are considered, including PP with short glass fiber (GF) reinforcements (rigid) and with short regenerated cellulose fiber (RCF) reinforcements (limp). In preliminary studies [10][11][12] these composites were characterized regarding their anisotropic elastic and fracture behavior. A decisive difference of the crack resistances was observed, distinguishing between a predominant direction (PD) and a transverse direction (TD) of the material.…”

Section: Theory Of Crack Deflection In Anisotropic Materialsmentioning

confidence: 99%

“…A decisive difference of the crack resistances was observed, distinguishing between a predominant direction (PD) and a transverse direction (TD) of the material. The anisotropy of the crack resistance, here resulting from the alignment of fibers during the employed injection molding process, is characterized by the ratio χ = K TD Ic /K TD Ic = J TD c /J PD c and was introduced in different crack deflection theories [4,10,12,13]. With Rice's J-integral [6] representing the fracture loading quantity and incorporating the effective anisotropic crack resistance J c (ϕ), the crack growth direction ϕ d is obtained by solving…”

Section: Theory Of Crack Deflection In Anisotropic Materialsmentioning

confidence: 99%

See 4 more Smart Citations

Crack deflection in short fiber reinforced composites: Theory and experiment

Judt

Ricoeur

2019

Proc Appl Math and Mech

Self Cite

View full text Add to dashboard Cite

In the past decades different crack growth and crack deflection criteria have been proposed, e.g. the maximum hoop stress criterion [1], the minimum strain energy density criterion [2] or the maximum energy release rate criterion [3]. These criteria were extended concerning phenomena such as crack path instability [4,5] and the anisotropy of fracture parameters [4]. Another approach for the prediction of crack growth and deflection angle is based on the J k -integral [6], assuming the crack to grow into the direction of the J-vector [7]. The resulting deflection angles coincide well with those from other criteria in the case of small mixed-mode ratios KII/KI or deflection angles, respectively. One challenge is the accurate calculation of the second coordinate J2 [8] and the appropriateness of this approach has been shown [9]. Nevertheless, in the cases of anisotropic crack resistance parameters, large mode-II loading or unstable crack paths, the classical J-vector criterion fails.In this paper, an extended J-vector criterion is introduced providing the crack growth direction in the case of anisotropic fracture parameters and elastic constants [9,10]. The theory is validated by experimental results for different anisotropy ratios and orientations.

show abstract

Section: Experiments and Resultsmentioning

confidence: 99%

Section: Experiments and Resultsmentioning

confidence: 99%

“…In preliminary studies [10][11][12] these composites were characterized regarding their anisotropic elastic and fracture behavior. Composite materials e.g.…”

Section: Theory Of Crack Deflection In Anisotropic Materialsmentioning

confidence: 99%

Section: Theory Of Crack Deflection In Anisotropic Materialsmentioning

confidence: 99%