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strain-rate-sensitive flow

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001816
EISBN: 978-1-62708-241-9
... of the temperature), the previous deformation the steel may have suffered and the grain size, coefficient m expresses the sensitivity of the applied tension to strain rate as follows: (Eq 1) m = log σ y 2 / σ y 1 log ε ̇ 0 2 / ε ̇ 0 1 T , d , ε...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003569
EISBN: 978-1-62708-180-1
...-centered cubic (bcc) structure, deformation generally is strain-rate sensitive. Thus, their reaction to cavitation is always a competition between flow and fracture. When pure iron is subjected to cavitation, it exhibits both brittle and ductile failure mechanisms. For hexagonal close-packed (hcp...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
... that can cause specimen-scale shear banding is the combination of minimum strain hardening and negative strain-rate hardening. A second case in which the central fibrous zone is (apparently) absent has been reported in an HY-100 steel. Both cases are discussed in this article. When edge- or center...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... that can cause specimen-scale shear banding is the combination of minimum strain hardening and negative strain rate hardening. A second case in which the central fibrous zone is (apparently) absent has been reported in an HY-100 steel. Both cases are discussed in this article. When edge- or center...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001593
EISBN: 978-1-62708-234-1
... utilized included scanning electron microscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry, thermomechanical analysis, and melt flow rate determination. It was the conclusion of the investigation that the part failed via brittle fracture, with evidence also indicating low...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
... formed parts cracking cracks forging grain flow heat treatment hydrogen content imperfections ingot pipe laminations metalworking nonmetallic inclusions pits porosity scabs seams sheet metal forming unmelted electrodes workability WROUGHT FORMS are produced by a wide variety...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001302
EISBN: 978-1-62708-215-0
... roughing die, where it was given a single large deformation at a high strain rate. The partially-formed kingpin was then moved to the finishing die and given a smaller deformation at a slower strain rate. The final piece was trimmed of flash and dropped in a steel bin to cool. It was then reaustenitized...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006835
EISBN: 978-1-62708-329-4
... over of metal without fusion. They are usually filled with scale and, on steel components, are often enclosed by a layer of decarburized metal ( Fig. 9 ). Other types of defects are flow-through defects and shear cracks, in which a diagonal shear band is established due to high strain rates. Fig...
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
.... Fig. 1 Schematic illustrations of creep curves. (a) Strain versus time. (b) Creep strain rate versus time Regardless of the form in which the data are presented, it is well known that creep data usually exhibit significant scatter. The scatter in creep data can result from differences...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2
... The acceleration of fatigue crack-growth rates that determines the transition from region 2 to region 3 is caused by the superposition of a brittle or a ductile tearing mechanism onto the mechanism of cyclic subcritical crack extension. These mechanisms occur when the strain at the tip of the crack, the maximum...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... fracture mechanisms for different loading conditions and environments. T , temperature; ε ̇ , strain rate; DBTT, ductile-brittle transition temperature; Δ K , stress-intensity factor range; K ISCC , stress-corrosion cracking threshold; K th , threshold stress-intensity factor; σ ys , yield...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... in Fig. 2 . Following initial elastic strain resulting from immediate effects of the load, there is a region of increasing plastic flow at decreasing strain rate (first-stage, or primary, creep). This first-stage creep represents an adjustment within the metal, which occurs in the first few moments after...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
.... This includes material composition, heat treatment, surface preparation (mill scale, coatings, surface finish, etc.), environmental composition (trace contaminants, dissolved gases, etc.), temperature, flow rate, solution concentration, and degree of agitation or aeration. In addition, corrosion product films...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006827
EISBN: 978-1-62708-329-4
... stress-strain curve of a solder alloy from uniaxial tension testing. Fig. 1 Typical stress-strain curve of a solder alloy (SAC305) Most solder alloys exhibit strong viscoplasticity behavior. Figure 2 shows the true stress-strain curves of the solder alloy under different strain-rate...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006797
EISBN: 978-1-62708-295-2
... rates of loading. Strain-rate sensitivity data have been compiled for many materials and are important in analysis of manufacturing operations involving deformation (see, for example, Forming and Forging , Volume 14 of the ASM Handbook , 1988). The amount of distortion that can occur at high rates...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003573
EISBN: 978-1-62708-180-1
... rates of loading. Strain-rate sensitivity data have been compiled for many materials and is important in analysis of manufacturing operations involving deformation (see, for example, Forming and Forging , Volume 14, ASM Handbook ). The amount of distortion that can occur at high rates of loading...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
.... Observation of Plastic Strain Smaller amounts of plastic deformation might be determined via careful measurement if the surfaces of the component are relatively smooth. The ability to see a neck in a tensile specimen depends on the amount of strain hardening and to some extent, the amount of strain-rate...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
... preparation (mill scale, coatings surface finish, etc.), environmental composition (trace contaminants, dissolved gases, etc.), temperature, flow rate, solution concentration, and degree of agitation or aeration. In addition, corrosion product films and other changes in surface composition can also occur...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... these topics in more detail. Fatigue Crack Growth Rates The limitation of the S - N and ε- N methods is the inability of the controlling quantities to make sense of the presence of a crack. In traditional stress analysis of applied loads, basic elasticity calculations show that both stress and strain...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
... instantaneous elastic strain from the applied load, followed by a region of increasing plastic strain at a decreasing strain rate ( Fig. 3b ). Following the first stage of primary creep is the region of secondary creep, where the creep rate is nominally constant at a minimum rate, generally known as the minimum...