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temperature changes

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001243
EISBN: 978-1-62708-225-9
... of environment because of constant temperature changes, and they normally are replaced after eight months. The bearings were lubricated by a molybdenum sulfide paste. Judging by their structure the needles probably consisted of ball bearing steel. They showed corroded initial cracks of the pitting type, i.e...
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
... cycle fatigue associated with cyclic temperature changes from normal service. The design of the part and the material selection were significant contributing factors because of stresses induced during molding, physical aging of the amorphous polysulfone resin, and the substantial differential...
Image
Published: 30 August 2021
Fig. 20 Change in impact energy with temperature for a 5140 steel tempered at 620 °C (1150 °F). One series of specimens was quenched from the tempering temperature; the other was furnace cooled. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0089663
EISBN: 978-1-62708-229-7
..., the fatigue was thermal fatigue caused by repeated temperature changes in the turbine over a period of about ten years. These temperature changes were more frequent than usual, because the turbine was on standby service for several years. In regions near the main fracture surface, small subsidiary cracks...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003526
EISBN: 978-1-62708-180-1
... integrity. As engineered components are subjected to external or internal temperature changes, several things happen. First, as expected, the temperature throughout the component changes. The temperature profile will be dependent on such variables as the component geometry, material thermal properties...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006773
EISBN: 978-1-62708-295-2
... of this article is on FEA and structural failure analysis, discussion is limited only to those thermal areas that affect structural integrity. As engineered components are subjected to external or internal temperature changes, several things happen. First, as expected, the temperature throughout the component...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... Abstract Thermomechanical fatigue (TMF) refers to the process of fatigue damage under simultaneous changes in temperature and mechanical strain. This article reviews the process of TMF with a practical example of life assessment. It describes TMF damages caused due to two possible types...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003550
EISBN: 978-1-62708-180-1
... appearance due to thermal degradation. These same changes may be observed in end-use environments, albeit at much slower rates due to the lower temperatures at which plastics are usually used. Thermal degradation of polymers is a chain reaction that begins when an atom (usually a hydrogen atom...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001110
EISBN: 978-1-62708-214-3
... in the transverse direction suggested the presence of longitudinal thermal stresses over some length of tube caused by general, rather than local, temperature changes. However, the major source of thermal stresses was the temperature fluctuations of the inner surface caused by the nonhomogeneous temperature...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001852
EISBN: 978-1-62708-241-9
... ductility at elevated temperature. The average properties at this temperature were found to be yield strength of 226 MPa, ultimate strength of 312 MPa, percentage elongation close to 56%, and area reduction close to 77%. Table 3 presents a comparison of property changes at elevated temperature. Fig...
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
... cannot be prevented by changing the strength or hardness of the metal. The modulus of elasticity of a given metal is affected only by temperature, increasing at lower temperature and decreasing at higher temperature. Buckling can be prevented only by changing the size or shape of the part with respect...
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
... of the material. Therefore, buckling cannot be prevented by changing the strength or hardness of the metal. The modulus of elasticity of a given metal is affected only by temperature, increasing at lower temperature and decreasing at higher temperature. Buckling can be prevented only by changing the size or shape...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006938
EISBN: 978-1-62708-395-9
... as the corresponding loading magnitudes and, due to the importance of polymer viscoelasticity, the dwell time of each cycle. Additionally, since loading is often accompanied by temperature changes, this information should be coupled to the prevailing environment of the part while loaded. An example of the types...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006867
EISBN: 978-1-62708-395-9
... product is deemed a failure solely because it no longer has the desired cosmetic appearance due to thermal degradation. These same changes may be observed in end-use environments, albeit at much slower rates due to the lower temperatures at which plastics are usually used. Thermal degradation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0091761
EISBN: 978-1-62708-229-7
... to 6400 h of operation. Investigation (visual inspection, metallographic examination, and stress analysis) supported the conclusion that the differing microstructure of the airfoil resulted in changes in mechanical properties. Because normal operation includes cycling of loads and temperatures, the shroud...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006922
EISBN: 978-1-62708-395-9
... Chemical resistance Thermal properties Assembly options Many of these benefits come with important considerations. For example, plastics are excellent thermal insulators, but they can expand and contract 5 to 10 times more than metals over the same temperature change. Ignoring this property can...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... Abstract Thermomechanical fatigue (TMF) is the general term given to the material damage accumulation process that occurs with simultaneous changes in temperature and mechanical loading. TMF may couple cyclic inelastic deformation accumulation, temperature-assisted diffusion within the material...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047199
EISBN: 978-1-62708-234-1
... that large changes in strength and exfoliation characteristics of 7075 forgings can be induced by changes in temperature or time of thermal treatment. With regard to the effect of quenching rate on exfoliation characteristics, a cold-water quench below 25 deg C (75 deg F) would appear to be far superior...
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
... reactions creep deformation creep fatigue failure creep-rupture failure microstructural changes stress-rupture failure thermal fatigue HIGH-TEMPERATURE and stress are common operating conditions for various parts and equipment in a number of industries. The principal types of elevated-temperature...
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
.... The article also reviews various factors related to creep behavior and associated failures of materials used in high-temperature applications. The complex effects of creep-fatigue interaction, microstructural changes during classical creep, and nondestructive creep damage assessment of metallic materials...