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high-strain-rate uniaxial stress response

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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 temperature and stress. The uniaxial creep test, typically performed at constant temperature and constant load, generates the following information: Deformation data: Usually presented in terms of uniaxial strain, measured over a gage length, as a function of time. This gives the creep curve...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006941
EISBN: 978-1-62708-395-9
... as a measure of the recoverable resistance of a material to deformation. If the material is in a fluid state, then the simplest relationship between stress and strain is one in which the applied stress is proportional to the rate of strain. In this case, the proportionality factor is referred...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006940
EISBN: 978-1-62708-395-9
.... The cyclic stress-strain response is the response of polymers that describes their behavior once cyclic plasticity has modified the metastable behavior under fatigue deformation. Cyclic stress-strain curves for high-density polyethylene (compression molded), impact polypropylene copolymer, short-glass-fiber...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006919
EISBN: 978-1-62708-395-9
..., molded from a rubber-modified PC, was subjected to a dynamic force applied with the bar shown at the top of the figure ( Ref 5 ). Figure 8 illustrates the stress-strain response as a function of strain rate that was measured in standard tensile tests. Using a linear finite-element analysis...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006934
EISBN: 978-1-62708-395-9
.... Because the yield point increases with strain rate, the ductile-brittle transition temperature also increases with strain rate. Thus, in the vicinity of the ductile-brittle transition temperature, a high strain rate may produce brittle fracture instead of a yield failure if the stress is sufficiently high...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001788
EISBN: 978-1-62708-241-9
... working conditions like temperature and strain rate, greatly affects the die deformation response and hence the die stresses and strains. In addition, die material behavior also affects the flow properties of deforming billet. From the resulted stress and strains values, die fatigue life has been...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006928
EISBN: 978-1-62708-395-9
... increases, the molecular resistance to further deformation decreases; that is, the effective modulus falls. The degree of curvature depends on the material and the test conditions. At high strain rates and/or low temperatures, the stress-strain relationship usually approximates a straight line. Most...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006944
EISBN: 978-1-62708-395-9
... by temperature and strain-rate. There are many different methods available to determine if the material will behave in a brittle or ductile manner. One way to better understand the ductile-brittle transition in amorphous polymers is through the stress-strain response. Figure 2 shows the stress-strain curve...
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
...-linear correlation was found between the lower yield strength and the number of grains containing twins, leading to the argument that twinning initiates at the yield stress with no further increase in the number of twins. Note that this is different from twinning initiated due to high strain rate...
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
..., a not-quite-linear correlation was found between the lower yield strength and the number of grains containing twins, leading to the argument that twinning initiates at the yield stress with no further increase in the number of twins. Note that this is different from twinning initiated due to high strain-rate...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006865
EISBN: 978-1-62708-395-9
..., that is, in a viscoelastic fashion. Their stressstrain response is nonlinear with time-dependent (creep) deformation; consequently, their fracture behavior is strongly influenced by temperature and the rate and overall time of load application. In addition, the considerable stress relaxation displayed by many polymers must...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003541
EISBN: 978-1-62708-180-1
... a straight line. This stress-strain response is termed linear elastic behavior because the stress is proportional to the strain, and on unloading, the specimen will return to its original dimensions. Fig. 15 Typical load-displacement curve for a ductile polymer tested in uniaxial tension...
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
... where the lower curve became essentially horizontal. This collapse load agrees with the limit-analysis collapse load of 1.5 times the load at yield. The beam made of stainless steel, which strain hardens at a rather high rate, showed no distortion at fiber stresses up to 1.47 times the yield strength...
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
... strength, as shown Fig. 4 where the lower curve became essentially horizontal. This collapse load agrees with the limit-analysis collapse load of 1.5 times the load at yield. The beam made of stainless steel, which strain hardens at a rather high rate, showed no distortion at fiber stresses up to 1.47...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006921
EISBN: 978-1-62708-395-9
... scission ensues. A general hydrolysis scheme is summarized in Fig. 1 . Fig. 1 Schematic of degradation by hydrolysis and subsequent chain scission The reduction in molecular weight consequent to chain scission can lead to a reduction of toughness and fracture strain. Stress is known...
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
... in regions of high stresses and strains, the subsequent crack growth mechanisms, and final fracture. They have also contributed to the optimization of materials, manufacturing, and component design as well as to the conduction of a proper failure analysis. Methods and material characteristics for fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001275
EISBN: 978-1-62708-215-0
... that squeeze clamping introduced a flaw at the inside surface of the pipe. The large voids and long fibrils of the first zone of the fractured surface indicated a high initial rate of growth. This may have been due to greater extrusion-induced residual stresses and higher clamp stresses near the inner pipe...
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: 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 Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... creep. Metal degradation and permanent deformation occur with time, depending on the actual temperature and stress levels. If temperatures and stresses exceed design-selection values, the component exhibits a higher creep rate and fails earlier than expected. High-temperature-creep failures sometimes...