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strain-rate effects

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040017
EISBN: 978-1-62708-300-3
... Abstract This chapter discusses the role of plastic deformation in forging and the effect of strain and strain rate on metal flow. It demonstrates the use of stress tensors and shows how metal flow can be represented qualitatively by the displacement of volume elements and quantitatively...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400027
EISBN: 978-1-62708-316-4
... Abstract This chapter discusses the fundamentals of plastic deformation and the role of strain and strain rate in sheet metal forming processes. It describes the conditions associated with uniform deformation, the significance of engineering and true strain, the effect of volume constancy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780028
EISBN: 978-1-62708-281-5
... is elongation. The stress-strain behavior presented in Fig. 15 varies strongly as a function of both strain rate and temperature. At very high strain rates, the molecules do not have adequate time to disentangle from each other and physically respond to the imposed stress. High-speed testing, known...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780146
EISBN: 978-1-62708-281-5
... of the polymer changes. High-speed (high-strain-rate) deformation favors nonductile failure while low-speed (low-strain-rate) deformation favors more ductile failure. The actual numerical value of T g will vary with the rate of testing used to make the measurement. Thus, when assessing temperature effects...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030074
EISBN: 978-1-62708-282-2
...-rate test in water at 350 °C (662 °F) even after 408 h of straining ( Ref 37 ). However, after 35% CW was applied to the gage of the alloy specimen, the fracture surface was 65% intergranular after only 60 h of slow strain-rate testing. Another study has shown that the crack growth rate by SCC in alloy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410163
EISBN: 978-1-62708-265-5
... 9.28 Nissan A. , The Effect of Microstructure and Induction Processing on Fatigue Performance and Crack Initiation of Induction Hardened Bar Steel , PhD Thesis, Colorado School of Mines, Golden, CO, 2012 9.29 Bearing Steels: The Rating of Nonmetallic Inclusions , ASTM , Philadelphia...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000059
EISBN: 978-1-62708-313-3
...′; in this respect, its behavior is similar to that of molybdenum and iron ( Ref 5 ). The coarsening rate of γ′ in Ni-Cr-Ti-Al alloys decreases with increasing chromium content in the 10 to 37 weight percent range because of a reduction in the equilibrium concentration of γ′ in γ and a reduction in coherency strains...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030062
EISBN: 978-1-62708-282-2
... to increase formability. The presence of strain-induced martensite has been shown to increase the corrosion rate of type 304L in 10% sulfuric acid ( Ref 18 ). This increased corrosion rate is believed to be the result of preferential attack of the martensite phase. The effect of σ phase on the corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400053
EISBN: 978-1-62708-316-4
... the stress state at any point in a material can be expressed in different ways for different purposes. It then compares and contrasts some of the more widely used yield criteria and demonstrates the use of flow rules. It also explains how to calculate power, energy, and effective strain and strain rate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040051
EISBN: 978-1-62708-300-3
... criterion). It compares and contrasts the two methods and demonstrates their use as flow rules. It also explains how to calculate effective strain and strain rate and includes a brief discussion on the mechanical energy consumed during deformation. flow stress plastic deformation strain rate...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610101
EISBN: 978-1-62708-303-4
... with the steps involved in determining strain energy release rates, stress intensity factors, J-integrals, R-curves, and crack tip opening displacement parameters. It also covers fracture toughness testing methods and the effect of measurement variables. crack tip opening displacement elastic-plastic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500083
EISBN: 978-1-62708-317-1
... Abstract This chapter describes the effect of temperature and strain rate on the mechanical properties and forming characteristics of aluminum and magnesium sheet materials. It discusses the key differences between isothermal and nonisothermal warm forming processes, the factors that affect...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780199
EISBN: 978-1-62708-281-5
... Abstract This article describes the general aspects of and practical problems of failure analysis of creep, stress relaxation, and yielding for homogeneous polymers. The effect of temperature and strain rate on the relationship between yield point and elastic modulus and the aging effect...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090257
EISBN: 978-1-62708-266-2
... to composition, microstructure, and heat treatment. It describes the types of environments where magnesium alloys are most susceptible to SCC and the effect of contributing factors such as temperature, strain rate, and applied and residual stresses. The chapter also discusses crack morphology and what it reveals...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090367
EISBN: 978-1-62708-266-2
... sometimes require long exposure periods. The most effective method for accelerating the SCC process in laboratory testing involves relatively slow-strain-rate tension testing of a specimen during exposure to appropriate environmental conditions. The application of slow dynamic strain exceeding...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540169
EISBN: 978-1-62708-309-6
... rate, the use of fracture indices and failure criteria, and the ramifications of crack-tip plasticity in ductile and brittle fractures. It goes on to describe the different types of plain-strain and plane-stress fracture toughness, explaining how they are measured and how they are influenced...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260001
EISBN: 978-1-62708-336-2
... rod is given by: (Eq 8) D E = D C ER The mean effective strain rate is given by ( Ref 10 and 11 ): (Eq 9) ε ¯ ˙ = 6 ⁢ V ⁢ D C 2 ⁢  tan  α ( D C 3 − D E 3 ) ⁢ 2 ⁢  In  D C D E where V...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
... in higher values of all these parameters. Fig. 2.54 Schematic influence of strain rate on yield stress. Source: Ref 2.6 As for fracture and yield stresses, the difficulty of crack propagation in finer grains is due to the boundaries between differently oriented grains. A smaller grain means...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090303
EISBN: 978-1-62708-266-2
... of metals and alloys. This section discusses the effects of alloy composition, texture, residual stress, and irradiation. As with other metals and alloys, SCC of zirconium depends strongly on stress, stress intensity, and strain rate. These factors have been investigated by conventional...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040193
EISBN: 978-1-62708-300-3
... process understanding and control. In its earlier application, process modeling helped die design engineers to preview the metal flow and possible defect formation in a forging. After the forging simulation is done, the contours of state variables, such as effective strain, effective strain rate...