Application of TCD for brittle fracture of notched PUR materials

Negru, Radu; Marșavina, Liviu; Voiconi, Tudor; Linul, Emanoil; Filipescu, Hannelore; Belgiu, George

doi:10.1016/j.tafmec.2015.05.005

Cited by 60 publications

(26 citation statements)

References 31 publications

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“…In fact, the average value of K c for t equal to 4 mm was seen to be lower than the corresponding average values determined both for t equal to 20 mm and for t equal to 30 mm. This is very surprising especially because, according to the classic rule recommended in the pertinent ASTM standard, the value for K c obtained with t = 30 mm was generated under fully developed plane strain conditions.…”

Section: Fracture Toughnessmentioning

confidence: 99%

“…In contrast, when materials deform plastically before final breakage takes place (for instance, metals and quasibrittle polymers), σ 0 becomes larger than σ UTS . These considerations should make it evident that the only way to determine inherent strength σ 0 accurately is by running appropriate experiments …”

Section: Fundamentals Of the Theory Of Critical Distancesmentioning

confidence: 99%

“…These considerations should make it evident that the only way to determine inherent strength σ 0 accurately is by running appropriate experiments. 22,23 Having quantified both σ eff and σ 0 , the notched or cracked material being assessed is then supposed not to fail as long as the effective stress calculated according to the volume, area, line, or point method is lower than the inherent material strength, i.e., σ eff <σ 0 :…”

Section: Fundamentals Of the Theory Of Critical Distancesmentioning

confidence: 99%

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A material length scale–based methodology to assess static strength of notched additively manufactured polylactide (PLA)

Ahmed

Susmel

2018

Fatigue Fract Eng Mat Struct

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The Theory of Critical Distances (TCD) is the name that has been given to a group of design methodologies that all make use of a material length scale parameter to postprocess the local linear‐elastic stress fields in the vicinity of the crack initiation locations. The aim of the present investigation is to check whether the simple linear‐elastic TCD is successful in predicting static strength of notched components made of 3D‐printed polylactide (PLA). PLA is a thermoplastic aliphatic polyester that is produced from renewable biodegradable resources. The accuracy and reliability of the TCD in estimating the static strength of additively manufactured (AM) PLA were assessed against a large number of experimental results generated by testing, under tensile loading as well as under bending, AM notched specimens containing different geometrical features (open notches included). The TCD was seen to be highly accurate, its systematic use resulting in estimates falling mainly within an error interval of about 20%. This result is certainly very relevant since it demonstrates that the linear‐elastic TCD can be used successfully to design against static loading notched components of AM PLA by directly postprocessing the results from simple linear‐elastic Finite Element (FE) models.

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Section: Fracture Toughnessmentioning

confidence: 99%

Section: Fundamentals Of the Theory Of Critical Distancesmentioning

confidence: 99%

Section: Fundamentals Of the Theory Of Critical Distancesmentioning

confidence: 99%

See 1 more Smart Citation

A material length scale–based methodology to assess static strength of notched additively manufactured polylactide (PLA)

Ahmed

Susmel

2018

Fatigue Fract Eng Mat Struct

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show abstract

“…Recently, starting from the aforementioned observations, Negru et al [54] proposed a similar equation that links L and the dimensionless parameter M e for mixed mode I-II loading conditions:…”

Section: The Theory Of Critical Distances (Tcd)mentioning

confidence: 99%

“…In order to evaluate A and B constants the experimental results obtained for two different notch geometries (presented in Tables Under Mode II loading the critical distance L/2 was found at 0.093 mm, while the critical stress was almost the same [54]. The coefficients from Eq.…”

Section: The Theory Of Critical Distances (Tcd)mentioning

confidence: 99%