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transient thermal stress

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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
... and are designed to provide service for 30 years. The regions of the casings in the vicinity of the steam chest and the steam passageways are subjected to high transient thermal stresses during start-up and moderate steady-state mechanical stresses during sustained operation. The metal temperature during steady...
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
... of the casings in the vicinity of the steam chest and the steam passageways are subjected to high transient thermal stresses during startup and to moderate steady-state mechanical stresses during sustained operation. The metal temperature during steady-state operation is approximately 538 °C (1000 °F), which...
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
... general-purpose FEA. Temperature changes are major source of problems in the design of engineered components. Earlier it was discussed how temperature changes could introduce steady-state thermal expansion stresses. In some cases stresses generated during temperature transients are more severe than...
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
... source of problems in the design of engineered components. Earlier it was discussed how temperature changes could introduce steady-state thermal-expansion stresses. In some cases, stresses generated during temperature transients are more severe than in steady-state conditions, and some materials can...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001686
EISBN: 978-1-62708-220-4
... for coils at the non-fired end of the vaporizer during low flow transients. Dryout results in rapid increase in the tube wall temperature. Thermal cycling of the coil is completed by liquid quenching resulting from resumption of normal flow rates and the return to annular flow. The probable root cause...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.9781627082952
EISBN: 978-1-62708-295-2
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
...-suited for linear, nonlinear, large rotation, and/or large strain applications. The analysis type is 3D transient thermo-mechanical analysis and the load steps are defined with respect to time. The stresses and strains induced due to the thermal cycles are obtained. Figures 17 and 18 show the von...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001828
EISBN: 978-1-62708-241-9
... transient, which occurs each time the pump is stopped. The thermal stresses due to this transient condition were evaluated for the bearing journal using the operating conditions of the incident. The finite-element analysis showed that the journal would meet the stress requirements of the ASME BPVC...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048850
EISBN: 978-1-62708-229-7
... downshocks might cause the damage pattern that was found. A transient heat transfer and thermal-stress analysis was performed with numerical methods and software identified as CREPLACYL and with material data taken from the Liquid Metal Fast Breeder Reactor Materials Handbook (U.S. Department of Energy...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001602
EISBN: 978-1-62708-229-7
... microstructures in the tip shroud region. Columnar grains Creep Equiaxed grains Hot corrosion Udimet 500 UNS N07500 Creep fracture/stress rupture High-temperature corrosion and oxidation Thermal fatigue fracture Most gas turbine bucket failures are caused by a combination of factors because...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001079
EISBN: 978-1-62708-214-3
.... The rotor was modeled as a two-dimensional axisymmetric body. Transient and steady-state thermal and mechanical operating conditions were analyzed for both cold-start and hot-start procedures. According to fracture mechanics, the square of the ratio of the fracture toughness to applied stress ( K Ic /σ...
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
... Some of the key material properties at high temperature are thermal expansion coefficient, stress rupture, elastic modulus, fatigue life, and oxidation resistance. Total strain at temperature is given by the sum of elastic stress-strain modulus, thermal expansion strain, and creep strain...
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
... Abstract The principal types of elevated-temperature mechanical failure are creep and stress rupture, stress relaxation, low- and high-cycle fatigue, thermal fatigue, tension overload, and combinations of these, as modified by environment. This article briefly reviews the applied aspects...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001149
EISBN: 978-1-62708-232-7
... of rolled and welded COR-TEN steel plate butt welded together on site. The pipe sustained local buckling and cracking, then fractured during the first five months of operation. Failure was due to low cycle fatigue and fast fracture caused by differential thermal expansion stresses. Thermal lag between...
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
... are stress rupture, creep, low- or high-cycle fatigue, thermal fatigue, and coating degradation in gas turbines. For high-temperature tubing and piping components, embrittlement phenomena can occur at high temperatures due to metallurgical instabilities; for example, carbide coarsening, sigma-phase formation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003512
EISBN: 978-1-62708-180-1
... based on its mechanical, corrosion, creep, toughness, and thermal properties as applicable. If necessary, the appropriate weld material is selected based on the chosen base material. Material is assigned an allowable stress value based on its ultimate and yield strengths and operating temperature range...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003564
EISBN: 978-1-62708-180-1
... not appear to affect the wear mechanism of these HIP materials. Transient wear of silicon nitride in lubricated rolling contact was investigated using a ball-on-rod test machine, with the maximum Hertz stress ranging from 5 to 6.5 GPa (0.72 to 0.94 × 10 6 psi). Wear rate and behavior were dependent...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001817
EISBN: 978-1-62708-180-1
.... Transient thermal conditions can arise when a fluid is brought into contact with a surface having a markedly different temperature or, more commonly, due to imposed system operations. Such thermal stresses result from constrained thermal expansion or contraction. Mechanical cyclic stresses arise from...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
... Abstract High-temperature corrosion can occur in numerous environments and is affected by various parameters such as temperature, alloy and protective coating compositions, stress, time, and gas composition. This article discusses the primary mechanisms of high-temperature corrosion, namely...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001779
EISBN: 978-1-62708-241-9
... deformation ( Fig. 8b ). These sorts of cracks could appear because of extra forces, which were applied to the surface by cavitation agents (e.g., smash, water jet, etc.). The impact force on the pits’ wall caused stress in the superficial transient state all the way to the bottom of the pits and then produce...