Fracture toughness and absorbed energy measurements in impact tests on brittle materials

Marshall, G. P.; Williams, J. G.; Turner, C. E.

doi:10.1007/bf00756625

Cited by 129 publications

(25 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Williams and coworkers [40,[50][51][52] and Schapery [53][54][55][56] have been especially active in this area, relating time-dependent crack growth to the viscoelastic constitutive properties of the material being fractured. Applications of their theoretical models have not been included in the scope of this study.…”

Section: Stick-slip Behaviormentioning

confidence: 99%

On the Use of a Driven Wedge Test to Acquire Dynamic Fracture Energies of Bonded Beam Specimens

Dillard

Pohlit

Jacob

et al. 2011

The Journal of Adhesion

View full text Add to dashboard Cite

A driven wedge test is used to characterize the mode I fracture resistance of adhesively bonded composite beam specimens over a range of crosshead rates up to 1 m=s. The shorter moment arms (between wedge contact and crack tip) significantly reduce inertial effects and stored energy in the debonded adherends, when compared with conventional means of testing double cantilever beam (DCB) specimens. This permitted collecting an order of magnitude more crack initiation events per specimen than could be obtained with end-loaded DCB specimens bonded with an epoxy exhibiting significant stick-slip behavior. The localized contact of the wedge with the adherends limits the amount of both elastic and kinetic energy, significantly reduces crack advance during slip events, and facilitates higher resolution imaging of the fracture zone with high speed imaging. The method appears to work well under both quasi-static and high rate loading, consistently providing substantially more discrete fracture events for specimens exhibiting pronounced stick-slip failures. Deflections associated with beam transverse shear and root rotation for the shorter beams were not negligible, so simple beam theory was inadequate for obtaining qualitative fracture energies. Finite element analysis of the specimens, however, showed that fracture energies were in good agreement with values obtained from traditional DCB tests. The method holds promise for use in dynamic testing and for characterizing bonded or laminated materials exhibiting significant stick slip behavior, reducing the number of specimens required to characterize a sufficient number of fracture events.

show abstract

Section: Stick-slip Behaviormentioning

confidence: 99%

On the Use of a Driven Wedge Test to Acquire Dynamic Fracture Energies of Bonded Beam Specimens

Dillard

Pohlit

Jacob

et al. 2011

The Journal of Adhesion

View full text Add to dashboard Cite

show abstract

“…Only those samples with N66 as major component were etched with tetrahydrofuran (THF) solvent prior to SEM characterization. Standard mechanical tests on notched Izod impact (ASTM-D256), tensile (ASTM-D638), and strain energy release rate (Gc) [34][35][36] were carried out at ambient temperature. Reactive SAG copolymers with 2%, 5%, and 10 % GMA and constant styrene/acrylonitrile ratio (S/A/= 65/25) were prepared by suspension polymerization [22].…”

Section: Methodsmentioning

confidence: 99%

Reactive compatibilization of ABS/Nylon 6,6 blends: Effects of reactive group concentration and blending sequence

Chang

1994

J Polym Res

View full text Add to dashboard Cite

Styrene-acrylonitrile-glycidyl methacrylate (SAG) copolymers with various glycidyl methacrylate (GMA) contents have been used to compatibilize the incompatible blends of acrylonitrile-butadiene-styrene (ABS) and nylon 6,6 (N66) by varying the blending sequences. When the epoxy group of SAG copolymer makes contact and reacts with the amine endgroup of N66, the resultant grafted products, SAG-g-N66, tend to reside at interface and act as compatibilizers of the blends. For a SAG copolymer with lower GMA content (SG2), a better compatibilized blend is achieved by sequential blending of the SAG2 with N66 then with ABS. When a higher GMA content SAG (SAG 10) is employed, on the contrary, a better compatibilized blend is obtained by preblending SAG10 with ABS then with N66. A grafted SAG-g-N66 molecule is considered as an effective compatibilizer when it anchors along the interface with the ungrafted SAG, or the SA segments, penetrating into the ABS phase while the branched N66 chains protruding into the N66 phase. The conventional one-step three-component blending usually results in less compatibilized blend than the properly selected sequential blending. The trend of mechanical properties observed closely match the compatibility of the blend in terms of domain size. However, the overall improvement of the resultant mechanical properties of the compatibilized blend over the uncompatibilized one is not substantial.

show abstract

“…47 On the contrary, the mass shear yielding ductile failure dominates at high temperature plane-stress conditions which involves significantly greater volume but less extension ratio relative to the brittle failure. 43 .... Critical Strain Energy Release Rate, Ge A fracture mechanics approach by notched impact testing was independently developed by Brown 48 and Marshall et al 49 by assuming the specimen to exhibit bulk linear elastic behavior. The experiments were purposely carried out at low temperature ( -40°C) and with a sharper notch (0.125 mm notch radius) to meet the criteria of this method as close as possible.…”

Section: Izod Impact Propertiesmentioning

confidence: 99%

Effect of Rubber Content in Acrylonitrile–Butadiene–Styrene and Additional Rubber on The Polymer Blends of Polycarbonate and Acrylonitrile–Butadiene–Styrene

Shen

Chang

1994

Polym J

View full text Add to dashboard Cite

ABSTRACT:Higher ABS rubber content in the polycarbonate (PC)/acrynitrile-butadienestyrene (ABS) blend resulted in toughness improvement in terms of tensile, Izod impact and strain energy release rate at a cost of higher melt viscosity. The extra-added core-shell rubber particles with poly(methyl methacrylate) (PMMA) or acrylonitrile-styrene (SAN) outer shell resided mainly in the ABS phase and further improved the resulted blends to11ghness. The addition of styrene-maleic anhydride (SMA) copolymer in the PC/ABS blends caused severe coagulation of the rubber particles in the ABS phase and left a greater fraction of the SAN phase without presence of rubber. The toughness improvement by increasing rubber content must be compensated by the increase of melt viscosity and this fact has to be taken into consideration in selecting the starting materials of the PC/ABS blends.

show abstract

Fracture toughness and absorbed energy measurements in impact tests on brittle materials

Cited by 129 publications

References 2 publications

On the Use of a Driven Wedge Test to Acquire Dynamic Fracture Energies of Bonded Beam Specimens

On the Use of a Driven Wedge Test to Acquire Dynamic Fracture Energies of Bonded Beam Specimens

Reactive compatibilization of ABS/Nylon 6,6 blends: Effects of reactive group concentration and blending sequence

Effect of Rubber Content in Acrylonitrile–Butadiene–Styrene and Additional Rubber on The Polymer Blends of Polycarbonate and Acrylonitrile–Butadiene–Styrene

Contact Info

Product

Resources

About