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high strain rate testing

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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
... is considered to have superplastic behavior when it shows extremely high and uniform elongations (from 100 to 1000%) under tension stress: a lack of localized necking or a series of diffuse necks along the test zone resulting from a combination of the creep tension stress and the strain rate suffered...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001135
EISBN: 978-1-62708-219-8
... conditions; whereas, the nonsegregated plates would fail in a ductile manner. It took a much greater, dynamic level to cause failure in the non-segregated plate because of the lower notch sensitivity and yielding that would occur. High strain rate testing on the bridge samples is of interest to us...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006930
EISBN: 978-1-62708-395-9
... is that the shear rate, shear strain, and shear stress are constant throughout the gap. This can be beneficial when steady state flow testing is being performed. However, sometimes there can be challenges when cone and plate geometry is used with high molecular weight materials because of the geometric requirements...
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
... in./s) within the sensitivity study. The rate-independent model is obtained when using one tabular hardening curve fitted to the PP true-stress/true-strain data at a strain rate, ε ̇ , of 0.01 s −1 from the tensile tests shown in Fig. 16 . High-speed tensile test data are not always...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001685
EISBN: 978-1-62708-235-8
... Studies were initiated to determine the effects of different levels of absorbed hydrogen and differences in the crosshead velocity (strain rate). Reference test material was prepared by solution heat treating in vacuum for 1h, whereas the low-hydrogen test group was solutionized for 8 h. Half...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001560
EISBN: 978-1-62708-217-4
... SEM Photograph Showing a Cup-Cone Fracture of a Specimen Tested in Oil at Nominal Strain Rate of 1.4×10 −6 s −1 . Fig. 4 High Magnification View of the Center Portion of Figure 3 Showing Dimple Rupture and Tearing. Results of the constant extension rate tests performed...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
...) Relationship of strain rate, or creep rate, and time during a constant-load creep test. The minimum creep rate is attained during second-stage creep Creep and stress-rupture data usually are obtained under constant-load test condition, and therefore, the stress in the gage section varies with time...
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
... the data generated from uniaxial creep tests in suitable forms for the design of components operating in the creep regime. The slope of the creep curve at any given point provides the creep strain rate or creep rate, typically denoted as d ε c dt or ε c ̇ . Figure 1(b) replots...
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
... of strain rate, or creep rate, and time during a constant-load creep test. The minimum creep rate is attained during second-stage creep. Fig. 4 Creep curves produced under constant-load and constant-stress conditions. Reprinted with permission from Wiley. Source: Ref 6 Creep and stress...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006910
EISBN: 978-1-62708-395-9
... 43. ISO 17281. Plastics – Determination of Fracture Toughness (G Ic and K Ic ) at Moderately High Loading Rates (1 m/s) 44. ISO 29221. Plastics – Determination of Mode I Plane-Strain Crack-Arrest Toughness 45. ASTM D6068. Standard Test Method for Determining J-R curves of Plastic Materials...
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: 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 Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... a hcp structure, just as there are differences in the stress necessary to cause cleavage. Deformation twinning does occur in materials having a bcc lattice, with twinning more likely at low temperature and elevated strain rates. (Strain rates commonly encountered in tensile testing of the order...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090457
EISBN: 978-1-62708-222-8
... resulting from a relatively high strain rate event and/or significant stress concentration. A relatively sharp corner formed by a retaining tab on the older design was shown to be a primary cause of the failures. Design Injection moldings Latches Stress concentration Polyacetal Brittle fracture...
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
... a critical value of the plastic strain is reached. Therefore, polymer lifetime depends mainly on the rate by which plastic strain is accumulated ( Ref 31 ). Arbeiter et al. ( Ref 33 ) performed lifetime estimations using extrapolation concepts and accelerated testing methods. They showed that fracture...
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 Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001840
EISBN: 978-1-62708-241-9
... analysis of fractured surface in sample No. 4 In high strain rate, deformations like explosive deformation, depending on amount of strain and rate of strain, materials can respond to deformation through two main mechanisms: uniform or homogenous deformation and localized plastic deformation [ 12...
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
... process. For instance, the brittle mechanism is favored in thicker and notched specimens and/or at low temperatures and high strain rate ( Ref 8 ). When thermoplastics are subjected to creep tests, two failure modes may occur; brittle failure is initiated by craze formation followed by slow craze...
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
... evaluations, the creep cavitation damage assessment, the oxide-scale-based life prediction, and high-temperature crack growth methods. coating evaluation creep cavitation damage assessment elevated-temperature failure gas turbine blade hardness testing high-temperature crack growth methods life...
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 rapid or high strain-rate loading. Two impact tests commonly employed for polymer materials are the Izod test and the Charpy test, which is also generally used for metallic materials. Impact strength is calculated by dividing the impact energy in Joules by the cross-sectional area of the fracture...