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constant extension test

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Published: 01 January 2017
Fig. 5.21 Mean crack velocity of constant-extension-rate tests on sensitized alloy 600 as a function of S 2 O 3 2 − concentration in air-saturated 1.3% H 3 BO 3 at 40 °C (104 °F). Source: Ref 5.83 More
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Published: 01 January 2017
Fig. 1.19 Variation in the average crack propagation rate in sensitized type 304 stainless steel in water at 288 °C (550 °F) with oxygen content. Data are from constant-extension-rate testing, constant-load testing, and field observations on boiling water reactor piping. IGSCC, intergranular More
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Published: 01 December 2015
Fig. 17 Variation in the average crack propagation rate in sensitized type 304 stainless steel in water at 288 °C (550 °F) with oxygen content. Data are from both constant extension rate (CERT) tests, constant load, and field observations on boiling water reactor piping. IGSCC, intergranular More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060033
EISBN: 978-1-62708-355-3
..., force-extension data, a quantitative measure of how the test piece deforms under the applied tensile force, usually are monitored and recorded. When properly conducted, the tensile test provides force-extension data that can quantify several important mechanical properties of a material...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060013
EISBN: 978-1-62708-355-3
... property tests Range of strain rate Type of test 10 –8 to 10 –5 s –1 Creep test at constant load or stress 10 –5 to 10 –1 s –1 Tension test with hydraulic or screw driven machines 10 –1 to 10 2 s –1 Dynamic tension or compression tests 10 2 to 10 4 s –1 High-speed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540431
EISBN: 978-1-62708-309-6
... by heat treatment. The carburized surface is hard and constant-amplitude loading. In fatigue load- wear resistant. ing, a loading in which all of the peak loads are equal and all of the valley loads are equal. Charpy test. An impact test in which a speci- Contrast with spectrum loading. men (with a V...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860269
EISBN: 978-1-62708-348-5
... Abstract This chapter reviews the concepts of fracture mechanics and their application to materials evaluation and the design of cryogenic structures. Emphasis is placed on an explanation of technology, a review of fracture mechanics testing methods, and a discussion on the many factors...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.9781627083553
EISBN: 978-1-62708-355-3
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.9781627083096
EISBN: 978-1-62708-309-6
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
... if unloading is prohibited at every point in the structure. Monotonic loading conditions prevail throughout a cracked body under steadily increasing applied loads, provided that crack extension does not occur. Because in any calculation of J , the crack length is held constant, W will be unique, and a valid...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490059
EISBN: 978-1-62708-340-9
... to conduct, and hence the database of information from these tests available to the engineer is less extensive than that from constant-load tests. Consequently, for almost all engineering applications, constant-load creep-test data are considered adequate because of the convenience of constant-load testing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
..., the stress-rupture test, measures the time it takes for a metal to fail at a given stress at elevated temperature. Engineering creep is measured by applying a constant load on a tensile specimen at a constant temperature and measuring the strain, or extension, of the specimen as a function of time...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060265
EISBN: 978-1-62708-355-3
.... elongation. A term used in mechanical testing to describe the amount of extension of a test piece when stressed. See also elongation, percent. elongation, percent. The extension of a uniform section of a specimen expressed as percentage of the original gage length: Elongation, % Lx Lo 100 Lo...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060065
EISBN: 978-1-62708-355-3
... than for screw-driven machines. Tests at Constant Crosshead Speeds Machines with a constant rate of extension are the most common type of screw-driven testers and are characterized by a constant rate of crosshead travel regardless of applied loads. They permit testing without speed variations...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... stress remained constant because net extension of the specimen was controlled to be zero. It was observed that the cyclic creep rates increased above those for monotonic testing, and that the primary or first-stage creep was the principal contributor, although the cyclic steady-state creep rates did...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060083
EISBN: 978-1-62708-343-0
... to determine the constants in creep equations such as that of Norton ( Ref 1.52 ) and Bailey ( Ref 1.53 ). Other models (such as those listed in Chapter 1, “Creep Under Monotonic and Cyclic Loading” ) are also available. The drawback is that most such models are based on uniaxial monotonic creep tests...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090367
EISBN: 978-1-62708-266-2
... it is necessary to select smaller specimens that afford the required predictive capability. Before about 1965, only constant-load or constant-strain tests of smooth and notched test specimens of various configurations were used to assess SCC. During the 1960s, two accelerated testing techniques based...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060021
EISBN: 978-1-62708-343-0
..., and time in order to determine multiheat constants that are then used to fit multiheat data from other materials and thus estimate rupture times. creep-rupture failure multiheat constants time to failure time-temperature parameters CREEP RUPTURE is essentially the end point of a creep test...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870075
EISBN: 978-1-62708-344-7
... (440 HB) at constant 0.005 mean strain. Source: Ref 4.2 Another way of displaying relaxation of mean stress due to strain cycling is shown in Fig. 4.7 from Conway and Sjodahl ( Ref 4.3 ). The material is AF2-1DA, an experimental nickel-base superalloy, tested isothermally at 760 °C (1400 °F...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... creep is measured by applying a constant load on a tensile specimen at a constant temperature and measuring the strain, or extension, of the specimen as a function of time. A schematic of a test setup for a creep test is shown in Fig. 1 . Creep tests may be run for as short as several months to as long...