scholarly journals Accuracy Validation of Measurement of Transient Thermal Stress at Steel Welds by Synchrotron X-ray Diffraction Techniques

2019 ◽  
Vol 68 (4) ◽  
pp. 325-331
Author(s):  
Shigetaka OKANO ◽  
Akihiro TSUJI ◽  
Shuoyuan ZHANG ◽  
Tadafumi HASHIMOTO ◽  
Takahisa SHOUBU ◽  
...  
Keyword(s):  
Thermal Stress ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transient Thermal Stress ◽  
Steel Welds ◽  
Transient Thermal ◽  
Accuracy Validation

scholarly journals Transient thermal stress wave and vibrational analyses of a thin diamond crystal for X-ray free-electron lasers under high-repetition-rate operation

2018 ◽  
Vol 25 (1) ◽  
pp. 166-176 ◽  
Author(s):  
Bo Yang ◽  
Songwei Wang ◽  
Juhao Wu
Keyword(s):  
Thermal Stress ◽  
Stress Wave ◽  
Free Electron ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
Free Electron Lasers ◽  
X Ray ◽  
High Repetition ◽  
Transient Thermal Stress ◽  
Transient Thermal

High-brightness X-ray free-electron lasers (FELs) are perceived as fourth-generation light sources providing unprecedented capabilities for frontier scientific researches in many fields. Thin crystals are important to generate coherent seeds in the self-seeding configuration, provide precise spectral measurements, and split X-ray FEL pulses,etc. In all of these applications a high-intensity X-ray FEL pulse impinges on the thin crystal and deposits a certain amount of heat load, potentially impairing the performance. In the present paper, transient thermal stress wave and vibrational analyses as well as transient thermal analysis are carried out to address the thermomechanical issues for thin diamond crystals, especially under high-repetition-rate operation of an X-ray FEL. The material properties at elevated temperatures are considered. It is shown that, for a typical FEL pulse depositing tens of microjoules energy over a spot of tens of micrometers in radius, the stress wave emission is completed on the tens of nanoseconds scale. The amount of kinetic energy converted from a FEL pulse can reach up to ∼10 nJ depending on the layer thickness. Natural frequencies of a diamond plate are also computed. The potential vibrational amplitude is estimated as a function of frequency. Due to the decreasing heat conductivity with increasing temperature, a runaway temperature rise is predicted for high repetition rates where the temperature rises abruptly after ratcheting up to a point of trivial heat damping rate relative to heat deposition rate.

TRANSIENT THERMAL STRESS PROBLEM FOR A CRACKED SEMI-INFINITE MEDIUM

1992 ◽  
Vol 15 (4) ◽  
pp. 451-468 ◽  
Author(s):  
Abd El-Fattah A. Rizk ◽  
Samir F. Radwan
Keyword(s):  
Thermal Stress ◽  
Infinite Medium ◽  
Stress Problem ◽  
Transient Thermal Stress ◽  
Transient Thermal

scholarly journals OS0802 Analysis of a Smart Multilayer Composite Disk for Control of Transient Thermal Stress

2013 ◽  
Vol 2013 (0) ◽  
pp. _OS0802-1_-_OS0802-2_
Author(s):  
Fumihiro ASHIDA ◽  
Sei-ichiro SAKATA ◽  
Takuya MORIMOTO ◽  
Tsuyoshi YAMADA
Keyword(s):  
Thermal Stress ◽  
Multilayer Composite ◽  
Transient Thermal Stress ◽  
Transient Thermal ◽  
Composite Disk
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