The influence of size effects and dynamic loading on the fracture toughness of commercial GRP materials

Geary, W.; Dutton, J. T.; Shuter, D. M.

doi:10.1016/s0266-3538(99)00170-0

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…The specimens were designed as three-or four-point bending of precracked beams, while the dynamic loading was applied using a modified split Hopkinson pressure bar (SHPB), a drop weight tower, or a modified Charpy tester [5]. Geary et al [6] studied the dynamic fracture toughness under different strain rates of glass reinforced polymer using three-point bending specimens, and they reported that the dynamic fracture toughness is higher than the static one owing to different failure modes. Samborski and Sadowski [7] compared the static and dynamic fracture toughness values for alumina and magnesia ceramics and investigated the effect of porosity on the fracture toughness and found that the increase of initial porosity reduces the values of both static and dynamic fracture characteristics.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Fracture Toughness of TaC/CNTs/SiC CMCs Prepared by Spark Plasma Sintering

Xie

Wosu

2015

Advances in Materials Science and Engineering

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This study focuses on the fracture toughness of TaC and carbon nanotubes (CNTs) reinforced SiC ceramic matrix composites (CMCs), prepared by spark plasma sintering (SPS) technique. A high densification of 98.4% was achieved under the sintering parameter of 133°C/min, 1800°C, and 90 MPa pressure. Vickers indentation was employed to measure the indentation toughness on the polished surface of ceramic samples, SEM was applied to directly observe the crack propagation after indentation, and split Hopkinson pressure bar (SHPB) was developed to determine the dynamic fracture toughness within the ceramic samples subjected to an impact in a three-point bending configuration.

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Section: Introductionmentioning

confidence: 99%

Dynamic Fracture Toughness of TaC/CNTs/SiC CMCs Prepared by Spark Plasma Sintering

Xie

Wosu

2015

Advances in Materials Science and Engineering

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“…It is well known that the measured values of fracture toughness often depend on the test specimen size and geometry, crack depth, and loading conditions. For example, there is a large amount of literatures (Pandey et al, 1998;Kulkarni et al, 2004;Geary et al, 2000;Hu, 2004;Ono et al, 2004;Kang et al, 2005) typically describing the increase of the cleavage fracture toughness with decreasing specimen thickness, associated with the transition from conditions of plane strain to plane stress due to the constraint loss effects. Even under plane strain conditions, constraint loss can be caused by large-scale in-plane plastic deformation with the decrement of the specimen size, when the size of the plastic zone is comparable to or larger than the characteristic length.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of Size Effects on the Ductile/Brittle Fracture Toughness of a Pressure Steel

Wang

Xue

et al. 2009

International Journal of Damage Mechanics

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Detailed un-standard experiments of fracture toughness in which SENB specimens of five different thicknesses were included, were carried out to investigate the size effect on the ductile and brittle fracture. It is found that the fracture toughness on the upper shelf increases with the size of the specimens, which have the similar geometry and then decreases gradually to the plane strain fracture toughness. The ductile fracture toughness increases with the size in the range of 4-16 mm for the increment of the plastic deformation zone size and plastic fracture strain under general yielding conditions, and then drops down from 16-22 mm for the increase of the high-stress triaxiality zone and the plastic deformation zone size not changing much which is less than the residual ligament width. While the fracture toughness of the lower shelf increases with the thickness in the range of 4-8 mm for the plastic deformation zone size increasing under small-scale yielding conditions, and then drops down from 8 to 22 mm for the increase of the high outof-plane constraint. Theoretical analysis with the primary definition of the fracture toughness J integral, the constraint level and the plastic deformation volume was performed to investigate the different size effects for different temperatures. Finite Element Analysis simulations with continuum damage model to get the distribution and variety of the stress triaxiality as an important factor of fracture strain and fracture toughness.

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“…For this reason, many researches have been conducted to obtain the variations of strength and stiffness of these composites with strain rate. However, most of the researches were concentrated on the behavior of the PMCs at high strain rates [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Geary et al [15] investigated the influence of the dynamic rates on fracture toughness behavior of commercial glass-reinforced plastic materials. Dynamic tests produced higher fracture toughness values than those obtained statically.…”

Section: Introductionmentioning

confidence: 99%

Loading Rate Sensitivity of High Strength Fibers and Fiber/Matrix Interfaces

Yazıcı

2008

Journal of Reinforced Plastics and Composites

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High strength fibers are extensively employed in many different composite applications. This article is concerned with the rate dependency of mechanical behavior of these fibers, namely S2 Glass Õ , Kevlar 29 Õ , and Spectra 900 Õ fibers at low loading rates. Also studied is bonding behavior of these fibers with the most used thermoset composite matrix materials, which are epoxy and polyester resins. With this regard, several tensile and single fiber pull-out tests were carried out by employing a 5 kN Instron testing machine. The experiments were conducted at loading rates ranging from 1 to 250 mm/min. Based on the results obtained in this research work, the tensile strength is increasing from 1 to 100 mm/min loading rate and fiber matrix bonding strengths are decreasing by enhancing loading rate. This implies that certain mechanical properties of some polymer matrix composites could be rate dependent, even at low loading rates.KEY WORDS: loading rate, high strength fibers, interfacial shear strength, critical fiber length.

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The influence of size effects and dynamic loading on the fracture toughness of commercial GRP materials

Cited by 9 publications

References 9 publications

Dynamic Fracture Toughness of TaC/CNTs/SiC CMCs Prepared by Spark Plasma Sintering

Dynamic Fracture Toughness of TaC/CNTs/SiC CMCs Prepared by Spark Plasma Sintering

Experimental and Theoretical Investigation of Size Effects on the Ductile/Brittle Fracture Toughness of a Pressure Steel

Loading Rate Sensitivity of High Strength Fibers and Fiber/Matrix Interfaces

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