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Weisbrod, Gil; Rittel, D.

doi:10.1023/a:1007673528573

Cited by 79 publications

(28 citation statements)

References 20 publications

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“…In their work, based on the arrival of the transmitted waves, they concluded that the specimen lost contact with the support for a very short period of time. Weisbrod and Rittel [29] and Rittel et al [30] used the MSHPB in a onepoint-bend impact configuration, to determine the fracture toughness of specimens with a relatively small size. More recently, the MSHPB technique has been successfully used by Irfan et al [31][32][33] to study the dynamic fracture of discontinuously reinforced aluminum composites; by Popelar et al [34] in the dynamic fracture toughness of 4340 steel; by Martins et al [35] and Martins and Prakash [36] in the dynamic fracture of linear medium-density polyethylene; by Jiang and Vecchio [37] in the study of the dynamic fracture of lightweight metals and steels; and by Evora and Shukla [38] in the characterization of polyester/TiO 2 nanocomposites.…”

Section: B Experimental Setup: Mshpbmentioning

confidence: 99%

Dynamic Fracture Initiation Toughness of a Gamma (Met-PX) Titanium Aluminide at Elevated Temperatures

Shazly

Prakash

Draper

2009

Metall Mater Trans A

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Recently, a new generation of titanium aluminide alloy named Gamma-Met PX (GKSS, Geesthacht, Germany) has been developed with better rolling and postrolling characteristics. Previous work on this alloy has shown the material to have higher strengths at room and elevated temperatures when compared with other gamma titanium aluminides. In particular, this new alloy has shown increased ductility at elevated temperatures under both quasistatic and high-strain-rate uniaxial compressive loading. However, its high-strain-rate tensile ductility at room and elevated temperatures is limited to~1 pct. In the present article, the results of a study investigating the effects of the loading rate and test temperature on the dynamic fracture initiation toughness in Gamma-Met PX are presented. A modified split Hopkinson pressure bar (MSHPB) was used along with high-speed photography, to determine the dynamic fracture initiation toughness. Three-point-bend fracture tests were conducted at impact speeds in the range 1 to 3.6 m/s and at test temperatures up to 1200°C. Furthermore, the effect of long-time high-temperature air exposure on the fracture toughness was investigated. The results show that the dynamic fracture initiation toughness decreases at test temperatures beyond 600°C. Moreover, the dynamic fracture initiation toughness was found to decrease with increasing exposure time. The reasons behind this drop are analyzed and discussed.

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Section: B Experimental Setup: Mshpbmentioning

confidence: 99%

Dynamic Fracture Initiation Toughness of a Gamma (Met-PX) Titanium Aluminide at Elevated Temperatures

Shazly

Prakash

Draper

2009

Metall Mater Trans A

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“…However, the geometry of the test beams, of span to width rati o equal to 4, indi cates that the specime n must be considered as a cracked Timoshenko beam [9] . The draw back of this method, as confirmed by several authors [4,7] is that the force is not easily measured accurately in a Ho pkin son bar, at least whe n the strains are measured in o nl y o ne section of the strike r bar. We propose he re a simplified me thod of calc ulatin g K 1 (t), based on the analysis of the behaviour of a crac ked Timoshenko beam, knowing the loading point di splacement, a vari able that can be measured more easily than can the appli ed load .…”

Section: Introductionmentioning

confidence: 99%

“…The impac tin g mass may be the strike r of a Ch arpy pendulum or a mass proj ected by a pneumatic device. Whe n the fracture pro perties of a materi al must be o btained at hi gh strain rate, the one-point be nding test may be perfo rmed using ex pe rime ntal devices based o n modificati o ns of the Hopkinson bar [3][4][5]. These syste ms con sist of a bar of a give n le ngth and di ameter (striker bar) whi ch is put in contact with the central section of a c racked specime n ide ntical to that whi ch would be used in a three-po int be nding test.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain K 1 (t) in o ne-point be nding tests, the Fini te E le ment method may be used [3][4][5][6][7], but other simplified methods have bee n used . These me thods are based o n the modal analys is of a cracked beam subjected to a kn own load in its central secti o n. With thi s procedure, the di splace me nt of any section JOURNAL DE PHYSIQUE IV of the beam can be calculated.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the dynamic stress intensity factor of a specimen under one-point bending from the measurement of the load-point displacement

2006

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Abstract. The use of dynami c o ne-point bending tests as an alternative to three-point bending tes ts all ows fracture prope rt ies such as dynami c initi ati o n frac ture toughness to be obtained at hi gh strain rate. To perfo rm thi s kin d of test, experimental dev ices based on modifi cati ons of the Hopkinson bar ca n be used. Several autho rs have been proposed si mpli fied procedures to obtain the dynami c stress intensity fac tor, K,( t ), considerin g the specimen as a Timos henko crac ked beam subj ected to a concentrated load at the ce ntral cross-secti on. T he di sad vantage of thi s procedure is th at norm all y it is diffi cult to measure the force applied to the specimen in the above-menti oned tests. Here a simplifi ed met hod is proposed for the calcul ati o n of K 1 (I), based on an analys is of the behav io ur of a Timos henko cracked beam, know ing the di splacement of the point of loading, whi ch can be measured more acc urate ly than the applied load. The resu lts were compared with those of a fin ite element numeri cal simulatio n and good agreement was fo und.

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“…The loading is performed on common mechanical or servo-hydraulic testing systems. The high speed tests are efficiently covered by a number of ballistic tests [5] and different adaptations of split Hopkinson bar test [6][7][8] including necessary supporting modelling. Comparably smaller effort has been paid to the loading rates of 1 up to 10 m/s (deformation rates from 10 -2 to 10 4 ).…”

Section: Introductionmentioning

confidence: 99%

Response of inherently brittle materials on higher loading rates

Chlup

Flasar

Dlouhý

2010

Engineering Fracture Mechanics

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Abstract. Generally, there are components loaded in a wide spectrum of loading rates, however most of design work is based on the data obtained using quasi-statical and uniaxial loading conditions. In case of inherently brittle materials the situation is all the more complicated because of their brittleness. There is a lack of experimental data and knowledge base of material response at loading in the range between quasi-static and ballistic loading rates.Cast basalt and soda-lime glass were the main experimental materials used in this investigation as a representative of natural based and structural brittle materials. These materials are widely used in civil industry as a building and decorative material, in chemical industry for transport of chemicals and in mining industry for transportation of powders (e.g. coal).Application in extreme conditions and safety requirements, in particular, raise an issue of fracture behaviour at higher loading rates. The main aim of the contribution is to investigate influence of strain rate on fracture resistance and to analyze response of the microstructure to high strain rate loading including the change of mechanical properties. The fractographic analysis of fracture surfaces was employed in the investigation with the aim to identify changes in fracture behaviour.

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Cited by 79 publications

References 20 publications

Dynamic Fracture Initiation Toughness of a Gamma (Met-PX) Titanium Aluminide at Elevated Temperatures

Dynamic Fracture Initiation Toughness of a Gamma (Met-PX) Titanium Aluminide at Elevated Temperatures

Determination of the dynamic stress intensity factor of a specimen under one-point bending from the measurement of the load-point displacement

Response of inherently brittle materials on higher loading rates

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