J-Fracture toughness of polymers at slow speed

Hale, G. E.; Ramsteiner, F.

doi:10.1016/s1566-1369(01)80031-5

Cited by 25 publications

(31 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1) had been corrected for indentation by using the correction curve produced in the indentation test at 5 mm/ min. All J I,lim values verified the size criteria proposed for the critical J I -values in the ESIS TC4 protocol for J c tests on plastics (Hale and Ramsteiner 2001). These criteria require that J Ic must be lower than J max calculated according to Eq.…”

Section: Resultssupporting

confidence: 60%

“…For the application of the multi-specimen testing procedure proposed by ESIS TC4 for J R curve construction (Hale and Ramsteiner 2001), the fracture tests were performed, with a crosshead speed of 5 mm/ min, on a series of nominally identical sharp notched specimens having a 0 /W of 0.57. The final crack length produced during each fracture test was measured on the specimen fracture surface by means of an optical travelling microscope after the specimen, previously cooled in liquid nitrogen, had been broken-open via impact.…”

Section: Methodsmentioning

confidence: 99%

“…To account for extraneous displacements mainly due to indentation effects, a load vs displacement correction curve was generated, at each loading rate, by performing a test on an un-notched sample following the procedure proposed by ESIS TC4 protocol (Hale and Ramsteiner 2001). The correction curve produced by this test (indentation test) was then used to correct the fracture energy values calculated from the load vs displacement curve obtained during the actual fracture test on a sharp notched sample.…”

Section: Methodsmentioning

confidence: 99%

“…For the construction of the J R curve of polymers, the multi-specimen procedure published by ESIS Technical Committee, TC, 4 (Hale and Ramsteiner 2001), which is based on that proposed by ASTM for metals (Landes and Begley 1974), can be adopted. Because of the extensive experimental activity and the considerable amount of material required in a multi-specimen procedure, the applicability of single-specimen techniques for the construction of a J R curve of polymers has also been analysed.…”

Section: List Of Symbols Amentioning

confidence: 99%

“…At each loading rate explored, the possible influence of the initial crack length to specimen width ratio, a 0 /W , on the results was investigated. With the main object of validating J Ic results obtained via the application of the procedure based on the load separation criterion by a comparison with data obtained by a more traditionally-used approach, the fracture behaviour of the material was investigated, at 5 mm/ min, also by applying the multi-specimen procedure proposed by ESIS TC4 (Hale and Ramsteiner 2001). The validity of the load separation criterion during fracture propagation was also analyzed.…”

Section: List Of Symbols Amentioning

confidence: 99%

See 4 more Smart Citations

On the applicability of the load separation criterion in determining the fracture resistance (J Ic) of ductile polymers at low and high loading rates

2010

View full text Add to dashboard Cite

In this work, the applicability of a procedure based on the load separation criterion in determining the fracture resistance (J Ic ) of a rubber modified polyamide 66 (PA66) was analyzed and discussed. In particular, the effects of the testing conditions, with particular reference to geometry and loading rate, on the applicability of the method were investigated. The tests were performed both at low (from 0.5 to 50 mm/ min) and moderately high (0.6 m/s) loading rates, on single edge notched in bending specimens with different initial crack length to width ratios (a 0 /W ), which ranged between 0.3 and 0.7. Among the various findings it is worthwhile to point out that this analysis revealed that the plastic displacement at the end of the blunting process (at fracture initiation) resulted geometry independent. A clear dependence of such a parameter on the loading rate was observed. Further, it was shown that load separation is maintained beyond the blunting phase, as observed in the experiments carried out at low rate. List of symbolsa Crack length ( mm) a 0 Initial crack length ( mm) A pl Area under the load per unit thickness vs plastic displacement (J/m) b Ligament length ( mm) b 0 Initial ligament length ( mm) B Specimen thickness ( mm) C Specimen elastic compliance ( mm/N) C 0 Initial elastic compliance of the specimen ( mm/N) E Young's modulus ( MPa) f Tabulated function (Williams 1987) G Geometry function H Material deformation function J Fracture resistance (J-integral) ( kJ/m 2 ) J bl J at the blunting line ( kJ/m 2 ) J el Elastic part of J ( kJ/m 2 ) J pl Plastic part of J ( kJ/m 2 ) J Ic J at fracture initiation ( kJ/m 2 ) J I,lim J at the point corresponding to the upper limit of the separable blunting region ( kJ/m 2 ) J 0.2 J at 0.2 mm crack extension ( kJ/m 2 ) m Multiplicative coefficient in blunting line equation P Load (kN) P b Blunt notched specimen load (kN) P N Normalized load ( MPa) P p Sharp notched specimen load (kN) 123 106 F. Baldi et al.

show abstract

Section: Resultssupporting

confidence: 60%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: List Of Symbols Amentioning

confidence: 99%

Section: List Of Symbols Amentioning

confidence: 99%

See 3 more Smart Citations

On the applicability of the load separation criterion in determining the fracture resistance (J Ic) of ductile polymers at low and high loading rates

2010

View full text Add to dashboard Cite

show abstract

Influence of the notch‐sharpening technique on styrene–acrylonitrile fracture behavior

Martínez

Salazar

Albiter

et al. 2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

This is the peer reviewed version of the following article:ABSTRACT: The Centre Català del Pl' àstic and Universidad Rey Juan Carlos laboratories joined forces to investigate the effect of the notch-sharpening technique on the fracture parameters of styrene-acrylonitrile. Contact notchsharpening techniques, such as razor tapping, razor sliding, and razor broaching, and a noncontact procedure, femtolaser, were analyzed. The fracture values of the samples with notches sharpened via contact techniques were divided into two groups: one with pop-in and the other with no pop-in in the load-displacement records; this resulted in the lowest and highest fracture toughnesses, respectively. The fracture parameters of the specimens with notches sharpened via a femtolaser were between those of the samples with notches sharpened via contact procedures in which pop-in occurred and those in which it did not. To explain these results, the crack front of the nontested specimens after sharpening was investigated in depth, we identified the type of damage and measured its size and the crack tip radii. The morphology of the crack front was related to the fractographic study.

show abstract

Fracture behaviour of controlled‐rheology ethylene–propylene block copolymers

Salazar

Martin

Navarro

et al. 2011

Polymer International

View full text Add to dashboard Cite

The evolution of the molecular weight distribution and the thermal, mechanical and fracture behaviour of controlled-rheology ethylene-propylene block copolymers (ca 8 wt% ethylene content) has been analysed. Various concentrations of di-tertbutylperoxide were utilized. The melt flow index increased with the peroxide content due to the reduction of the molecular weight and the narrowing of the molecular weight distribution. However, the thermal behaviour and degree of crystallinity were not improved and some mechanical properties, such as the tensile strength and elongation at break, presented an anomalous behaviour. This trend can be explained by the presence of the elastomeric phase. The addition of peroxide influenced strongly the J -R curves obtained via the elastic-plastic fracture mechanics approach. The slope of these curves was markedly reduced with addition of peroxide to almost being flat for the highest concentration. This loss of ductility and the sudden decrease of the fracture toughness values with an increasing amount of peroxide were mainly due to the reduction in the molecular weight.

show abstract

J-Fracture toughness of polymers at slow speed

Cited by 25 publications

References 3 publications

On the applicability of the load separation criterion in determining the fracture resistance (J Ic) of ductile polymers at low and high loading rates

On the applicability of the load separation criterion in determining the fracture resistance (J Ic) of ductile polymers at low and high loading rates

Influence of the notch‐sharpening technique on styrene–acrylonitrile fracture behavior

Fracture behaviour of controlled‐rheology ethylene–propylene block copolymers

Contact Info

Product

Resources

About