Topic
Charpy impact test
About: Charpy impact test is a(n) research topic. Over the lifetime, 6591 publication(s) have been published within this topic receiving 76917 citation(s).
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TL;DR: In this article, it was shown that the J-integral can be directly evaluated from single load-displacement records for a series of crack toughness specimens having the common feature that their only significant length dimension is that of the uncracked ligament.
Abstract: It is shown that the J-integral can be directly evaluated from single load-displacement records for a series of crack toughness specimens having the common feature that their only significant length dimension is that of the uncracked ligament. For the special case of bending loads on the ligament of a deeply cracked bar, J is shown to be twice the work of deformation divided by the ligament area. This and like results are employed to discuss Charpy and 'equivalent energy' toughness measures and also to evolve yet simpler estimating procedures for the J-integral.
536 citations
TL;DR: In this article, a composite system consisting of SiC yarn reinforced lithium aluminosilicate (LAS) glass-ceramic, containing ZrO2 as the nucleation catalyst, has been found to be reproducibly fabricated into composites that exhibit exceptional mechanical and thermal properties to temperatures of approximately 1000° C.
Abstract: Silicon carbide fibre reinforced glass-ceramic matrix composites have been investigated as a structural material for use in oxidizing environments to temperatures of 1000° C or greater. In particular, the composite system consisting of SiC yarn reinforced lithium aluminosilicate (LAS) glass-ceramic, containing ZrO2 as the nucleation catalyst, has been found to be reproducibly fabricated into composites that exhibit exceptional mechanical and thermal properties to temperatures of approximately 1000° C. Bend strengths of over 700 MPa and fracture toughness values of greater than 17 MN m−3/2 from room temperature to 1000° C have been achieved for unidirectionally reinforced composites of ∼ 50 vol% SiC fibre loading. High temperature creep rates of 10−5 h−1 at a temperature of 1000° C and stress of 350 MPa have been measured. The exceptional toughness of this ceramic composite material is evident in its impact strength, which, as measured by the notched Charpy method, has been found to be over 50 times greater than hot-pressed Si3N4.
441 citations
TL;DR: In this paper, a ductile phase containing bulk metallic glass composites is prepared via an in situ method by rapid quenching of a homogenous Zr56.2Ti13.8Nb5.0Cu6.9Ni5.6Be12.5 melt.
Abstract: Ductile phase containing bulk metallic glass composites are prepared via an in situ method by rapid quenching of a homogenous Zr56.2Ti13.8Nb5.0Cu6.9Ni5.6Be12.5 melt. The microstructure of the resulting two phase material is investigated by SEM, X-ray diffraction, and microprobe analysis. The composite material, as well as single phase materials with the corresponding matrix and second phase compositions, are tested in uniaxial tension and compression. Young's Modulus, shear modulus and Poisson ratios are analyzed by ultrasonic sound velocity measurements. The composite material demonstrates strongly improved Charpy impact toughness (by a factor of 2.5 compared to Vitreloy 1) and ductility (average fracture strain up to 8.3% in compression and 5.5% in tension). These remarkable improvements are explained by the effect of the mechanically soft and ductile second phase, which acts stabilizing against shear localization and critical crack propagation.
432 citations
01 Nov 2005
TL;DR: In this article, the authors present the results of the 23rd SOFT Conference, Venice, Italy (2004) Reference CRPP-CONF-2005-006 Record created on 2008-05-13, modified on 2017-05/12
Abstract: Note: Proc. 23rd SOFT Conference, Venice, Italy (2004) Reference CRPP-CONF-2005-006 Record created on 2008-05-13, modified on 2017-05-12
384 citations
TL;DR: In this paper, the critical strain energy release rate for impact tests may be deduced for both Charpy and Izod tests from normal energy measurements using a method of analysis, based on which a calibration factor is determined and the method is applied to a range of polymers.
Abstract: A method of analysis is given by which the critical strain energy release rate Gc for impact tests may be deduced for both Charpy and Izod tests from normal energy measurements Suitable calibration factors are determined and the method is applied to a range of polymers Very close agreement is achieved between the Charpy and Izod results except for highly ductile materials for which it was necessary to use a fully plastic analysis The method is extended to blunt notches and it is shown that the use of a strain energy per unit volume to yielding, together with a blunt notch stress analysis, gives a good description of the results
306 citations