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high rate uniaxial stress

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Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003293
EISBN: 978-1-62708-176-4
... son, Bertram Hopkinson. Based on these contributions and also on an important paper by R.M. Davies, H. Kolsky invented the split-Hopkinson pressure bar, which allows the deformation of a sample of a ductile material at a high strain rate, while maintaining a uniform uniaxial state of stress within...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003299
EISBN: 978-1-62708-176-4
... of experimental results obtained from SHPB testing of ceramics, and effectiveness of the proposed modifications. split Hopkinson pressure bar testing ceramics incident pulse shaping specimen design stress-strain relationship high strength brittle ceramics plastic properties high strain rate...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003298
EISBN: 978-1-62708-176-4
... soft materials. These techniques include the data-reduction techniques and assumptions required to use polymer pressure bars, the importance of sample-size considerations to polymer testing, and temperature-control methodologies to measure the high-strain-rate uniaxial stress response of polymers...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003296
EISBN: 978-1-62708-176-4
... preparation high rate uniaxial stress mechanical property tensile Hopkinson bar EXPERIMENTAL TECHNIQUES in characterizing the behavior of materials at high rates of strain are concerned with measuring the change in mechanical properties, such as yield strength, work hardening, and ductility, which can...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006282
EISBN: 978-1-62708-169-6
... = μ p / 1 − μ p High values of R indicate anisotropy and high resistance to thinning in a biaxial stress field. Table 3 contains uniaxial tensile, biaxial tensile, and R values for several titanium alloys. The ratio of the biaxial tensile ultimate strength (BTU...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001297
EISBN: 978-1-62708-170-2
... for secondary creep rate ( ε ˙ ) = constant σ n can be applied, where ε ˙ is the stain rate, σ is the stress, and n is the stress exponent. The latter is close to the one found by uniaxial creep testing of films (see the section “Uniaxial Creep Testing of Films” in this article). Fig...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003291
EISBN: 978-1-62708-176-4
... principal stresses) and does not work if TF is negative. The exponential Eq 32 gives lower multiaxial ductility values at small and negative values of h and is more conservative at high degrees of multiaxiality. Both curves go through the uniaxial point, which is TF = 1 and h = 1 3 ( Fig. 8...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003286
EISBN: 978-1-62708-176-4
... Testing” gives an overview of methods that may be used to rapidly generate creep data over several orders of magnitude in strain rate. Creep properties have for the most part been studied under uniaxial stress conditions in which the loading is applied parallel to the longitudinal axis...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003290
EISBN: 978-1-62708-176-4
... is a major design issue is in high temperature bolting. After being initially torqued to ensure joint tightness the stress progressively relaxes at a rate that depends on the creep strength of the material. For major components such as steam turbine shell flanges, it is essential to avoid leakage by periodic...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006807
EISBN: 978-1-62708-329-4
... of high-temperature components, the constant-stress uniaxial tension test has been, and is likely to remain, the primary means of generating creep data for different materials. The information gained from this test reveals, in a simplified way, how a given material will behave under different combinations...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003295
EISBN: 978-1-62708-176-4
... sensitivities determined by torsion tests on a variety of materials compare more or less well with those determined by axial tests. Another advantage of torsion testing at high strain rates is the absence of geometric dispersion. When an axial stress pulse (tension or compression) travels down a cylindrical...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005421
EISBN: 978-1-62708-196-2
... but simultaneously occurring stages, that is, nucleation, growth, and coalescence. An important requirement for cavitation during deformation under either conventional hot working (high-strain-rate) conditions or superplastic forming is the presence of a tensile stress. Under conditions of homogeneous compression...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009010
EISBN: 978-1-62708-185-6
... to a locally higher strain rate and thus to an increase in the flow stress in the necked region due to strain-rate hardening. Such strain-rate hardening inhibits further development of the strain concentration in the neck. Thus, a high strain-rate sensitivity imparts a high resistance to necking and leads...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002366
EISBN: 978-1-62708-193-1
... 1045 steel and Inconel 718 under various stress states, ranging from torsion to uniaxial to internal/external pressure. McDowell and Poindexter ( Ref 58 ) extended this approach to address the dependence of the crack propagation rate on stress state and on crack length normalized by transition crack...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009012
EISBN: 978-1-62708-185-6
... on the surface of the extrusion billet. Such high strain rates may lead to hot shortness. The results show that slight differences in flow stress exist ( Fig. 4 ), but for the limited number of specimens tested, the differences between treatments are not statistically significant. However, the ε f data...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003261
EISBN: 978-1-62708-176-4
... uniaxial tension test uniaxial compression test plastic deformation strain tension specimen stress-strain curve ductility notch tensile tests compression tests Tensile load Compressive load Strain Rate THE MECHANICAL BEHAVIOR OF MATERIALS is described by their deformation and fracture...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003294
EISBN: 978-1-62708-176-4
... has two principal advantages. The expanding ring test subjects the material to a state of dynamic uniaxial stress without the wave propagation complications that accompany other high strain rate tests. Also, the maximum strain rate available in the ring test is higher than in any other common tension...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003302
EISBN: 978-1-62708-176-4
..., it is well established in high-strain-rate literature (e.g., Ref 4 ) that plastic properties of materials are strongly a function of strain rate for a vast majority of materials. The use of static hardness as a measure of yield stress, for example, in a high-speed machining process or under high...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009003
EISBN: 978-1-62708-185-6
... of possible plastic deformation before fracture (ductility). Therefore, a complete description of the workability of a material is specified by its flow stress dependence on processing variables (for example, strain, strain rate, preheat temperature, and die temperature), its failure behavior...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003301
EISBN: 978-1-62708-176-4
... COMPRESSIVE PROPERTIES AND FAILURE MODES of many materials, particularly brittle materials, are dramatically affected by stress triaxiality. This has been demonstrated through various laboratory experiments, since the early work of Bridgman ( Ref 1 ), who demonstrated several failure modes peculiar to high...