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75-mm Hopkinson system

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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
... in detail. It illustrates a 75-mm Hopkinson system, particularly designed to test large samples of concrete, rock, polymeric composites, and other materials with relatively coarse microstructures. The article also provides information on the pneumatic pressure vessel for a 75-mm Hopkinson bar test system...
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Published: 01 January 2000
Fig. 1 Photograph of a 75 mm (3 in.) diam Hopkinson bar test system More
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Published: 01 January 2000
Fig. 2 Schematic of a 75 mm (3 in.) diam Hopkinson bar test system More
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Published: 01 January 2000
Fig. 3 Photograph of a pneumatic pressure vessel for a 75 mm (3 in.) Hopkinson bar test system More
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Published: 01 January 2000
Fig. 4 Schematic of a pneumatic pressure vessel for a 75 mm (3 in.) Hopkinson bar test system. t , thickness; D , diameter; OD, outside diameter More
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
... without a concomitant decrease in the specimen and bar diameters. The use of small diameter bars (<6 mm) to achieve higher strain rates is a common practice in split-Hopkinson pressure bar testing ( Ref 3 ). Pulse Shaping Because the value of t from Eq 17 has a practical minimum...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003303
EISBN: 978-1-62708-176-4
... ), Fowles ( Ref 47 ), and McQueen ( Ref 49 ). Explosive-driven shock-loading systems offer the advantage of shock loading very large sample assemblies and components. Impact velocities up to approximately 6 mm/μs ( 15 64 in.μs) and a large range in shock pressures up to approximately 5 Mbar...
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
... Abstract This article reviews high strain rate compression and tension test methods with a focus on the general principles, advantages, and limitations of each test method. The compression test methods are cam plastometer test, drop tower compression test, the Hopkinson bar in compression...
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
... −1 . Between strain rates of 10 2 and 10 4 s −1 , the torsional Kolsky (or split-Hopkinson) bar has proven to be a very convenient method of testing. Other methods of high strain rate shear testing include double shear and punching, which provide somewhat higher rates than the torsional Kolsky bar...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003300
EISBN: 978-1-62708-176-4
... is a variation of a technique proposed by Kolsky ( Ref 2 ), in which the specimen is loaded in compression. It is described in the article “Classic Split-Hopkinson Pressure Bar Testing” in this Volume. Fig. 1 Dynamic aspects of material testing. Source Ref 1 Fig. 2 Schematic of the torsional...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003308
EISBN: 978-1-62708-176-4
... 0.28 89 77 73 68 64 59 55 50 46 41 37 32 28 23 18 14 10 0.30 88 76 71 66 61 56 52 47 42 37 32 27 23 18 13 9 3 0.31 88 75 70 65 60 55 50 45 40 35 30 25 20 18 10 5 0 Dimension B , mm Dimension A , mm 1.0 1.5 2.0 2.5 3.0 3.5 4.0...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003330
EISBN: 978-1-62708-176-4
... concludes with a discussion on the split-Hopkinson pressure bar test. compression testing fatigue testing fiber-reinforced composites flexure testing interlaminar failure mechanical properties mechanical testing nondestructive techniques shear testing split-hopkinson pressure bar test strain...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006546
EISBN: 978-1-62708-290-7
... was used in Polyflow to achieve good deposition simulation results. Fig. 1 Geometry and mesh before first layer deposition in material extrusion deposition modeling. Source: Ref 4 For this simulation, deposition temperature was 220 °C (430 °F), deposition speed was 20 mm/s (0.75 in./s...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003276
EISBN: 978-1-62708-176-4
... and Hopkinson pressure bar methods) Abrasion tests Erosion tests The more common types of hardness tests are the indentation methods, described in previous articles in this Section. These tests use a variety of indentation loads ranging from 1 gf (microindentation) to 3000 kgf (Brinell). Low...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.9781627082907
EISBN: 978-1-62708-290-7
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006384
EISBN: 978-1-62708-192-4
... In the same conditions previously given ( p ∞ = 10 5 Pa, p v = 2300 Pa, ρ = 1000 kg/m 3 ) and for a bubble of initial radius R 0 = 1 mm (0.04 in.), the collapse time is τ = 92 μs. This estimate shows that the lifetime of a cavitation bubble is generally quite small, which is consistent with the high...
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006952
EISBN: 978-1-62708-439-0
... of a spherical indentation. (b) Example indentation stress-strain curve. Source: Ref 19 Employing an additive manufacturing technique known as laser-engineered net shaping ( Ref 18 ), researchers ( Ref 19 ) deposited compositionally graded titanium-nickel cylindrical specimens ~10 mm (0.4...
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.9781627084390
EISBN: 978-1-62708-439-0
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006983
EISBN: 978-1-62708-439-0
... across a powder bed, melting powders layer by layer, followed by rapid solidification. Typical commercial systems use up to 16 lasers with a square powder bed of 300 to 600 mm (12 to 23.6 in.). Some machine platforms use round build plates as well, which are designed around the needs of many aerospace...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006306
EISBN: 978-1-62708-179-5
... s −1 ) on force displacement for different iron-carbon alloys is illustrated in Fig. 5 ( Ref 7 ). These compression tests were performed by applying a split Hopkinson bar method to simulate the conditions observed during chip formation at high cutting speed. Grade 1 ADI has a more pronounced...